JPH10108086A - Image quality improvement circuit of television receiver - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a television receiver for improving image quality by picture creation processing suitable for a viewing environment. SOLUTION: Image-specific information obtained from program information such as data broadcasting, seasonal and daily life cycle information obtained from a built-in calendar function, indoor lighting information obtained from a color temperature detection sensor, and viewing / listening A means is provided for detecting the state of the viewing environment, such as information on the area of the user's preference and information on the image quality control mode. Then, an optimal mode for the detection situation is selected from a plurality of types of picture making processing modes, and signal processing for improving image quality is performed. [Effect] With a simple operation, it is possible to realize a television receiver for viewing television images in a form that matches the viewing environment and the tastes of the viewer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image quality improvement signal processing for a television receiver, and more particularly to a method for improving image quality such as picture creation in consideration of an image genre, a viewing time zone, and a viewing environment such as lighting conditions. The present invention relates to an image quality improvement circuit for a simple television receiver.

[0002]

2. Description of the Related Art In a television receiver, signal processing for improving various image quality for receiving a high-quality television image is performed. In this image quality improvement, for example, the function of contour enhancement that gives sharpness to the image, the function of faithful color reproduction such as skin color that is a memory color, the function of noise removal, the function of picture creation operation by nonlinear processing, etc. Numerous inventions and ideas have been made relating to signal processing methods and circuits.

Although these functions are effective for improving image quality even when used alone, it is general to perform signal processing in a form in which these functions are combined in order to obtain a higher improvement effect. By controlling the characteristics of each function, it is possible to perform various picture-making operations.

However, a conventional television receiver employs a mechanism for controlling these characteristics independently for each function. For this reason, the adjustment operation becomes extremely complicated in order to perform a picture-making operation that matches the viewing environment and the tastes of the viewer, and there is a problem that the operation cannot be performed by ordinary viewers, or a great deal of labor is required. ing.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in consideration of the above-described problems. It is an object to provide an image quality improvement circuit.

[0006]

In order to achieve the above-mentioned object, according to the present invention, there are provided means for detecting viewing environment information such as an image genre, a viewing area, a viewing time zone, and lighting conditions; There are provided two types of image quality improvement signal processing means and means for selecting one of the image quality improvement signal processes based on the detected viewing environment information.

Further, there is provided means for sound quality improvement signal processing for creating a sound having a sound effect matching the image based on the image genre information of the viewing environment information.

[0008] The detection of the viewing environment information in the present invention is performed by the method described below.

Image genre information includes table of contents information transmitted by text multiplex broadcasting, program information transmitted by data broadcasting, and EPG (Electronic) transmitted by digital broadcasting.
(Program Guide) data, or a combination thereof.

[0010] Information on the one-day cycle and season is detected by a calendar function with a built-in clock.

The information on the local area is detected by inputting or selecting code information corresponding to the relevant local area among a plurality of prepared local areas.

The color temperature information is detected by inputting or selecting code information corresponding to the illumination light source among a plurality of illumination light sources prepared in advance, or by output signals of a color temperature detection sensor and an illuminance detection sensor. .

According to the method described above, it is possible to easily detect information on the viewing environment necessary for improving the image quality.

An example of the image quality adaptation to the viewing environment according to the present invention is shown in (Table 1).

[0015]

[Table 1]

Table (a) shows an example of the characteristics and effects of the image quality improvement signal processing for each image genre. In the characteristics shown in the table,
Set signal processing for luminance signal processing, contrast, black level, white level, and edge enhancement. And, in the sports program, it is clear and sharp, in the variety program, it is clear,
He makes paintings that emphasize the feeling of sunao, and the drama and cinema programs that emphasize the shine and gloss. On the other hand, for news and other programs, standard picture making is performed.

Table (b) is a characteristic example of image quality improvement for each day cycle. In the morning, she creates paintings that emphasize the refreshing and refreshing feeling, the daytime clear and sharp, and the nighttime relaxing and relaxing.

Table (c) is a characteristic example of image quality improvement for each area. Bluish white (cold color) in the Kanto area
In the Kansai area, he creates paintings with a reddish white (warm color) that emphasizes the clearness.

Table (d) is a characteristic example of the image quality improvement for each color temperature. When the lighting is fluorescent color with a high color temperature, a picture is emphasized with a bluish component, and with white light with a low color temperature, a reddish component is emphasized.

As shown in Table (e), the image quality is improved for each season, and a picture is created with emphasis on bluish white (cool color) in summer and reddish white (warm color) in winter.

Table 2 is a characteristic example of sound quality improvement for obtaining a sound effect that matches the genre of an image.

[0022]

[Table 2]

In sports and variety programs, a live feeling,
In drama and cinema programs, sound is created with emphasis on profound feeling, and in news and other programs, sound with emphasis on clarity.

As described above, the signal processing for improving the image quality and the sound quality is performed in a form linked with the viewing environment information.
For this reason, the setting of signal processing for image quality improvement and sound quality improvement that matches the viewing environment can be performed very easily using the detected viewing environment information.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to a block diagram shown in FIG. In the figure, 1 is a video signal demodulation unit, 2 is an image quality improvement processing unit, 3 is an image display unit, 4 is a viewing environment detection unit, and 5 is a control unit.

The video signal VS is subjected to predetermined demodulation processing in the video signal demodulation unit 1, that is, baseband demodulation of a received broadcast wave,
Performs signal processing such as signal separation and color demodulation. Then, it outputs a demodulated signal S1 (luminance signal Y, color difference signals Cr, Cb).

The image quality improvement processing section 2 performs signal processing for improving image quality such as, for example, contour enhancement, color adjustment, and picture making operation. In this signal processing, characteristics are set by the control signal QC to achieve an image quality improvement effect that matches the viewing environment. And 3
The signal is converted into a primary color signal, and a signal S2 (three primary color signals R, G, B) is output. Details of this operation will be described later.

The image display unit 3 is a display such as a CRT having input / output characteristics having γ characteristics, and displays an image of the signal S2.

The viewing environment detecting section 4 detects viewing environment information such as image genre information, viewing area area information, viewing time zone information, and color temperature information. Then, the obtained environment information signal S3 is output. Details of this operation will be described later.

The control unit 5 determines the characteristics of the image quality improvement signal processing suitable for the viewing environment based on the environment information signal S3, and outputs a control signal QC indicating the characteristics. This operation will also be described later.

First, an example of the configuration of the viewing environment detecting section 4 will be described with reference to FIG. 6, reference numeral 6 denotes a decode unit, 7 denotes a program information file unit, 8 denotes a built-in calendar unit, 9 denotes a color temperature detection sensor unit, 10 denotes a remote control unit, and 11 denotes an environment information setting unit.

For data broadcasting (text multiplex broadcasting, digital broadcasting EPG, etc.), the decoding unit 6 performs a predetermined decoding process. Then, it outputs the decoded program information data (table of contents, program contents, etc.).

The program information file section 7 performs file formation, storage, and retrieval of program information data. That is, in the filing process, the contents of the program are played back from the input program information data.
Tsu, variety, drama cinema, news and other 4
The genre is classified into various genres, and a data file including a broadcast CH, a broadcast time, and a genre is created. The information of this file is sequentially stored in a built-in memory in a file format in the accumulation process. Then, the latest program information is always updated and stored in the built-in memory. In the search process, the genre information is searched from the data file using the time data of the life cycle information signal CKI of the built-in calendar section 8 and the received CH information (not explicitly shown in the drawing) as keywords, and received. The genre information signal JI of the CH program is output.

The built-in calendar section 8 is a clock having a calendar function, and outputs data of the date and time as a life cycle information signal CKI. With this date data, information on the season (summer and winter) and the morning, day, and night of the day can be obtained.

The color temperature detection sensor section 9 measures the spectral distribution of light with the color temperature detection sensor and outputs data (fluorescent color and white light color) of ambient light and illumination light as a color temperature information signal WI. Note that, instead of the sensors, the viewer may select corresponding information from code information prepared in advance.

The remote controller 10 outputs the mode of the image quality improvement processing designated by the viewer as a viewer designation information signal UIF. In consideration of the operability, the modes that can be specified are limited to any of the four types for each genre.

The environment information setting unit 11 receives the information signal J
The area information signal EI set by I, CKI, WI, UIF and the built-in viewing area code is converted into a code to generate an environment information signal S3. Unspecified code assignment is performed for information signals that cannot be detected.

Next, an example of the characteristic setting operation in the control unit 5 will be described with reference to Table 3.

[0039]

[Table 3]

The left column of the table shows the contents of the viewing environment information, and the right column shows the characteristics of luminance / color difference processing and RGB gain processing for image quality improvement set by the control signal QC corresponding thereto. Luminance / color difference processing is four types of characteristics 1 to 4 and RGB gain processing is three types of characteristics A to C. These characteristics are combined to create a picture that matches the viewing environment shown in (Table 1). Achieve the effect. The specific characteristics will be described later.

Genre information JI and life cycle information CKI
Stipulates the characteristics of a picture-making operation mainly related to clear, refreshing, sharp, shiny, and sharp feeling. On the other hand, the color temperature information WI and the region information EI mainly specify characteristics of color reproduction such as a warm color system and a cool color system.

In setting image quality improvement characteristics, priority is given to the viewer designation information UIF. That is, when the UIF code is designated, the characteristic corresponding to the designated JI code is set. On the other hand, if not specified, a characteristic determined by the environment information JI, CKI, WI, EI is set.

Next, an example of the configuration of the image quality improvement processing section 2 and its operation will be described with reference to FIGS. 3 to 5 and (Table 4). FIG. 3 shows an example of this configuration. In FIG.
Denotes a luminance nonlinear processing unit, 15 denotes a characteristic setting unit, 16 denotes an outline correction unit, 17 denotes an RGB conversion unit, and 18 denotes an RGB gain processing unit.

Demodulated signal S1 (luminance signal Y, color difference signals Cr, Cb)
Are the color difference gain processing units 12 and 13 and the luminance nonlinear processing unit 1
4. The contour correction unit 16 mainly performs signal processing for a picture-making operation such as clear, clear, sharp, shiny, and sharp feeling.

The luminance non-linear processing unit 14 performs signal processing of the input / output characteristics of characteristics 1 to 4 shown in FIG. Here, characteristic 1 is sports, characteristic 2 is variety, and characteristic 3
"Drama Cinema" and "Characteristic 4" correspond to news and other genres. Characteristics 1 and 3 are non-linear characteristics of about Y = X0.9 (X is an input and Y is an output), and characteristics 2 and 4 are linear characteristics. On the other hand, the color difference gain processing units 12 and 13
Performs signal processing for gain control of characteristics 1 to 4 shown in FIG.

The characteristic setting section 15 controls the picture creation operation and the signal processing for reproducing the flesh color. That is, a flesh color area is detected from the signal levels of the luminance signal and the color difference signal, and in this area, control for performing signal processing of flesh color reproduction, which is important as a storage color, is performed. In other areas, control is performed to perform a picture creation process having characteristics determined by the control signal QC.

The contour correcting section 16 performs signal processing for adding sharpness to an image. FIG. 5A shows an example of this configuration, and FIG.

The edge component detecting section 19 receives the input luminance signal Y1
The second derivative processing of the signal waveform is performed, and the signal S shown in FIG.
Extract 11 The non-linear expansion unit 20 performs signal processing to expand the signal level of the negative component of the signal S11 by two to three times in order to realize contour enhancement with good black tightness.
The signal S12 shown in (b) is generated. The gain adjustment unit 21 weights the coefficient value to the signal S12. The setting of the coefficient value is controlled by the control signal QC. That is, in the case of the characteristic 1, the coefficient value is set slightly larger, and in the case of the characteristic 2, the coefficient value is set slightly smaller.
The adder 23 adds the output signal S13 to the signal S14 whose delay time has been adjusted by the delay unit 22, and obtains a signal S15 whose edge is enhanced by edge addition shown in FIG. on the other hand,
The transient improvement unit 24 performs signal processing for transient improvement to make the rising and falling of the signal waveform of the luminance signal Y1 steep, and generates a signal S16 shown in FIG. The selector 25 outputs the signal S15 obtained by adding edges when the control signal QC has the characteristics 1 and 2, and outputs the signal S16 obtained by improving the transient when the control signals QC have the characteristics 3 and 4. Then, the edge enhancement suitable for picture creation shown in (Table 1) is achieved.

Returning to FIG. 3, the RGB conversion section 17 performs a matrix operation process to obtain the luminance signal Y2 and the color difference signals Cr1, Cb1.
Is converted into three primary color signals R, G, B.

The RGB gain processing unit 18 controls the warm color system and the cool color system of the colors by adjusting the gain of the three primary color signals, and achieves the effect of picture creation shown in (Table 1). Table 4 shows an example of one characteristic of this control.

[0051]

[Table 4]

In the characteristic A (warm color system), the gain of the R signal is increased, and in the characteristic B (cool color system), the gain of the B signal is increased.
In the characteristic C, a standard gain is set. Note that characteristics A and B
Even in the case of, the skin color region important as a memory color is processed with the standard gain of the characteristic C, and faithful reproduction of the skin color is realized.
Then, output three primary color signals RD, GD, and BD that have been subjected to the image quality improvement processing according to the present invention are obtained.

As described above, according to the present embodiment, it is possible to realize a television receiver which can easily improve the image quality in accordance with the viewing environment, and is effective for improving the image quality of the television image which matches the viewer's sensitivity. It is.

Next, a second embodiment of the present invention will be described with reference to a block diagram shown in FIG. This embodiment is suitable for converting an interlaced television signal into a progressive scan by scanning line interpolation and receiving an image. In the figure, 1 is a video signal demodulation unit, 2 is an image quality improvement processing unit, 4 is a viewing environment detection unit, 5 is a control unit, 26 is a scan conversion unit, and 27 is an image display unit.

The video signal VS is subjected to a predetermined demodulation process in the video signal demodulation unit 1, that is, baseband demodulation of a received broadcast wave,
Performs signal processing such as signal separation and color demodulation. Then, it outputs a demodulated signal S1 (luminance signal Y, color difference signals Cr, Cb).

The scan conversion unit 26 performs signal processing for interpolating the signal of the scanning line dropped out by the interlaced scanning with the signal of the demodulation signal S1 and converting the signal into a sequential scanning signal, and sequentially scans the signal S21 (luminance signal, color difference signal ). Note that this signal processing includes motion adaptive interpolation processing that changes the mixing ratio of a plurality of types of interpolation signals according to the motion of an image, and motion compensation interpolation processing that generates an interpolation signal using a motion vector of a detected image. It can be easily realized by conventional techniques.

The image quality improvement processing unit 2 performs signal processing for improving image quality such as, for example, contour emphasis, color adjustment, and picture making operation. In this signal processing, characteristics are set by the control signal QC to achieve an image quality improvement effect that matches the viewing environment. And 3
The signal is converted into a primary color signal, and a signal S22 (three primary color signals R, G, B) is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The image display unit 27 is a display such as a CRT having input / output characteristics having γ characteristics, and displays an image of the signal S22 in a sequential scanning form.

The viewing environment detecting section 4 detects viewing environment information such as image genre information, viewing area area information, viewing time zone information, and color temperature information. Then, the obtained environment information signal S3 is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The control unit 5 determines the characteristics of the image quality improvement signal processing suitable for the viewing environment based on the environment information signal S3, and outputs a control signal QC indicating the characteristics. This operation is similar to that of the above-described embodiment, and the description is omitted.

As described above, according to this embodiment, it is possible to realize a television receiver which can easily improve the image quality in accordance with the viewing environment, and is effective for improving the image quality of the television image which matches the viewer's sensitivity. It is.

Next, a third embodiment of the present invention will be described with reference to a block diagram shown in FIG. This embodiment is suitable for receiving an image with the input / output characteristics of the image display unit being linear (γ = 1). In the figure, 1 is a video signal demodulation unit, 2 is an image quality improvement processing unit, 4 is a viewing environment detection unit, 5 is a control unit, 2
Reference numeral 6 denotes a scan conversion unit, 28 denotes an inverse γ correction unit, and 29 denotes an image display unit.

The video signal VS is subjected to predetermined demodulation processing in the video signal demodulation unit 1, that is, baseband demodulation of a received broadcast wave,
Performs signal processing such as signal separation and color demodulation. Then, it outputs a demodulated signal S1 (luminance signal Y, color difference signals Cr, Cb).

The scan conversion section 26 performs signal processing for interpolating the signal of the scanning line dropped out by the interlaced scanning with the signal of the demodulation signal S1 and converting the signal into the signal of the sequential scanning, and sequentially scans the signal S21 (luminance signal, color difference signal ). Note that this signal processing includes motion adaptive interpolation processing that changes the mixing ratio of a plurality of types of interpolation signals according to the motion of an image, and motion compensation interpolation processing that generates an interpolation signal using a motion vector of a detected image. It can be easily realized by conventional techniques.

The image quality improvement processing section 2 performs signal processing for image quality improvement such as, for example, contour enhancement, color adjustment, and picture making operation. In this signal processing, characteristics are set by the control signal QC to achieve an image quality improvement effect that matches the viewing environment. And 3
The signal is converted into a primary color signal, and a signal S22 (three primary color signals R, G, B) is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The inverse gamma correction unit 28 outputs the three primary color signals of the signal S22.
An arithmetic process of raising each of R, G, and B to the power of -γ is performed to generate a three-primary-color signal S23 having linear characteristics. The calculation of the power of -γ can be easily realized by, for example, a table lookup process using a ROM.

The image display unit 29 is a PDP, LCD, DMD
An image of the signal S23 is displayed on a display having input / output characteristics having linear (γ = 1) characteristics.

The viewing environment detecting section 4 detects viewing environment information such as image genre information, viewing area area information, viewing time zone information, and color temperature information. Then, the obtained environment information signal S3 is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The control unit 5 determines the characteristics of the image quality improvement signal processing suitable for the viewing environment based on the environment information signal S3, and outputs a control signal QC indicating the characteristics. This operation is similar to that of the above-described embodiment, and the description is omitted.

As described above, according to the present embodiment, it is possible to realize a television receiver which can easily improve the image quality in accordance with the viewing environment, and is effective for improving the image quality of the television image which matches the viewer's sensitivity. It is.

Next, a fourth embodiment of the present invention will be described with reference to a block diagram shown in FIG. This embodiment is also suitable for receiving images with the input / output characteristics of the image display unit being linear (γ = 1). 1 in the figure is a video signal demodulation unit, 31
Is an image quality improvement processing unit, 4 is a viewing environment detection unit, 5 is a control unit,
26 is a scan conversion unit, 30 is an RGB conversion unit, 28 is an inverse γ correction unit, and 29 is an image display unit.

The video signal VS is subjected to predetermined demodulation processing in the video signal demodulation unit 1, that is, baseband demodulation of a received broadcast wave,
Performs signal processing such as signal separation and color demodulation. Then, it outputs a demodulated signal S1 (luminance signal Y, color difference signals Cr, Cb).

The scan conversion section 26 performs signal processing for interpolating the signal of the scanning line dropped out by the interlaced scanning with the signal of the demodulation signal S1 and converting the signal into the signal of the sequential scanning, and sequentially scans the signal S21 (luminance signal, color difference signal ). Note that this signal processing includes motion adaptive interpolation processing that changes the mixing ratio of a plurality of types of interpolation signals according to the motion of an image, and motion compensation interpolation processing that generates an interpolation signal using a motion vector of a detected image. It can be easily realized by conventional techniques.

The RGB converter 30 outputs a signal S21 (luminance signal,
The signal is converted into three primary color RGB signals by matrix operation of the color difference signal) to obtain a signal S31 (three primary color R, G, B signals).

The inverse gamma correction unit 28 outputs the three primary color signals of the signal S31.
An arithmetic process for raising R, G, and B to the power of -γ is performed to generate a three-primary-color signal S32 having linear characteristics. The calculation of the power of -γ can be easily realized by, for example, a table lookup process using a ROM.

The image quality improvement processing section 31 performs signal processing for image quality improvement such as contour emphasis, color adjustment and picture making operation on the three primary color signals having linear characteristics. The characteristics of this signal processing are set by the control signal QC to achieve an image quality improvement effect that matches the viewing environment. Then, a signal S33 (three primary color signals R, G, B) is output. The specific configuration and the like will be described later.

The image display unit 29 is composed of PDP, LCD, DMD
An image of the signal S33 is displayed on a display having input / output characteristics having linear (γ = 1) characteristics.

The viewing environment detecting section 4 detects viewing environment information such as image genre information, viewing area area information, viewing time zone information, and color temperature information. Then, the obtained environment information signal S3 is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The control section 5 determines the characteristics of the image quality improvement signal processing suitable for the viewing environment based on the environment information signal S3, and outputs a control signal QC indicating the characteristics. This operation is similar to that of the above-described embodiment, and the description is omitted.

As described above, according to this embodiment, it is possible to realize a television receiver which can easily improve the image quality in accordance with the viewing environment, and is effective for improving the image quality of the television image which matches the viewer's sensitivity. It is.

Next, a fifth embodiment of the present invention will be described with reference to the block diagram shown in FIG. This embodiment is also suitable for receiving images with the input / output characteristics of the image display unit being linear (γ = 1). 1 in the figure is a video signal demodulation unit, 31
Is an image quality improvement processing unit, 4 is a viewing environment detection unit, 5 is a control unit,
26 is a scan conversion unit, 30 is an RGB conversion unit, 28 is an inverse γ correction unit, and 29 is an image display unit.

The video signal VS is subjected to predetermined demodulation processing in the video signal demodulation unit 1, that is, baseband demodulation of a received broadcast wave,
Performs signal processing such as signal separation and color demodulation. Then, it outputs a demodulated signal S1 (luminance signal Y, color difference signals Cr, Cb).

The RGB converter 30 outputs a signal S1 (luminance signal,
The signal is converted into a three-primary-color RGB signal by a matrix operation of the color-difference signal) to obtain a signal S41 (three-primary-color R, G, and B signals).

The inverse gamma correction unit 28 outputs the three primary color signals of the signal S41.
An arithmetic process of raising each of R, G, and B to the power of -γ is performed to generate a three-primary-color signal S42 having linear characteristics. The calculation of the power of -γ can be easily realized by, for example, a table lookup process using a ROM.

The scan conversion unit 26 performs signal processing for interpolating the signal of the scanning line which has been skipped by the interlaced scanning with the signal S42 for the three primary color signals having linear characteristics and converting the signal into a signal of progressive scanning. A progressive scanning signal S43 (RGB signals of three primary colors) is generated. Note that this signal processing includes motion adaptive interpolation processing that changes the mixing ratio of a plurality of types of interpolation signals according to the motion of an image, and motion compensation interpolation processing that generates an interpolation signal using a motion vector of a detected image. It can be easily realized by conventional techniques.

The image quality improvement processing section 31 performs signal processing for image quality improvement such as, for example, contour enhancement, color adjustment, and picture making operation.
The characteristics of this signal processing are set by the control signal QC to achieve an image quality improvement effect that matches the viewing environment. Then, a signal S44 (three primary color signals R, G, B) is output. The specific configuration and the like will be described later.

The image display unit 29 includes a PDP, LCD, DMD
An image of the signal S44 is displayed on a display having input / output characteristics such as linear (γ = 1) characteristics.

The viewing environment detecting section 4 detects viewing environment information such as image genre information, viewing area area information, viewing time zone information, and color temperature information. Then, the obtained environment information signal S3 is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The control unit 5 determines the characteristics of the image quality improvement signal processing suitable for the viewing environment based on the environment information signal S3, and outputs a control signal QC indicating the characteristics. This operation is similar to that of the above-described embodiment, and the description is omitted.

FIG. 10 shows the image quality improvement processing section 31 in the fourth and fifth embodiments. Figure (a) shows an example of the configuration, (b),
(c) is an example of the characteristic.

The three primary colors R, converted into linear characteristics by inverse γ processing,
The G and B signals are mainly processed by the non-linear processing section 32 and the contour correction section 33 for signal processing for picture creation operations such as clear, clear, sharp, glossy, and sharp feeling.

The non-linear processing unit 32 performs signal processing of the input / output characteristics of characteristics 1 to 4 shown in FIG. Here, characteristic 1 corresponds to sports, characteristic 2 corresponds to variety, characteristic 3 corresponds to drama cinema, and characteristic 4 corresponds to news and other genres. Characteristics 1 and 3 are non-linear characteristics of about Y = X0.9 (X is an input and Y is an output), and characteristics 2 and 4 are linear characteristics.

The contour correction section 33 performs signal processing for adding sharpness to an image, and is configured in a form in which the nonlinear expansion section 20 in FIG. 5A is omitted. The characteristics 1 and 2 output signals subjected to edge enhancement processing by adding edges, and the characteristics 3 and 4 output signals subjected to edge enhancement processing by transient improvement. In the edge enhancement with edge addition, the coefficient value is set to be slightly larger in the case of the characteristic 1 and slightly smaller in the case of the characteristic 2.

The gain processing section 34 controls the warm color system or the cool color system by adjusting the gain of the three primary color signals, and achieves the picture-making effects shown in Table 1. One characteristic example of this control is shown in FIG. The gain of the R signal is increased for the characteristic A (warm color system), the gain of the B signal is increased for the characteristic B (cool color system), and the standard gain is set for the characteristic C. The output three primary color signals subjected to the image quality improvement processing according to the present invention
Obtain RD, GD, BD.

Although not explicitly shown in the figure, a flesh color area is detected from the signal levels of the three primary color signals, and in this area, signal processing for faithfully reproducing an important flesh color as a memory color is preferentially performed. In areas other than the above, picture creation processing with characteristics determined by the control signal QC is performed.

As described above, according to the present embodiment, it is possible to realize a television receiver which can easily improve the image quality in accordance with the viewing environment, and is effective for improving the image quality of a television image which matches the viewer's sensitivity. It is.

Next, a sixth embodiment of the present invention will be described with reference to the block diagram shown in FIG. This embodiment is also suitable for receiving images with the input / output characteristics of the image display unit being linear (γ = 1). In the figure, 1 is a video signal demodulation unit, 3
6 is an image quality improvement processing section, 4 is a viewing environment detection section, 5 is a control section, 26 is a scan conversion section, 30 and 37 are RGB conversion sections, 2
8 is an inverse γ correction unit, 29 is an image display unit, 35 is YCrCb
It is a conversion unit.

The video signal VS is subjected to predetermined demodulation processing in the video signal demodulation unit 1, that is, baseband demodulation of a received broadcast wave,
Performs signal processing such as signal separation and color demodulation. Then, it outputs a demodulated signal S1 (luminance signal Y, color difference signals Cr, Cb).

The RGB converter 30 outputs the signal S1 (luminance signal,
A process for converting into a RGB signal of three primary colors is performed by a matrix operation process of a color difference signal).

The inverse γ correction unit 28 performs an arithmetic process of raising each of the three primary color RGB signals to the power of −γ to generate three primary color signals having linear characteristics. The calculation of the power of -γ is performed, for example, in a ROM
Can be easily realized by a table look-up process or the like.

The YCrCb converter 35 converts a matrix signal into a luminance signal and a color difference signal having linear characteristics.

The scan conversion unit 26 performs signal processing for interpolating the signals of the scanning lines that have been skipped by the interlaced scanning and converting the signals into a sequential scan signal for the luminance signal and the color difference signal having the linear characteristics. Generate a signal. Note that this signal processing includes motion adaptive interpolation processing that changes the mixing ratio of a plurality of types of interpolation signals according to the motion of an image, and motion compensation interpolation processing that generates an interpolation signal using a motion vector of a detected image. It can be easily realized by conventional techniques.

The image quality improvement processing section 36 performs signal processing for image quality improvement such as contour enhancement, color adjustment and picture making operation on the luminance signal and color difference signal having linear characteristics. That is, for the luminance signal, the picture creation process with the characteristics shown in FIG. 10B and the color difference signal with the characteristics shown in FIG. 4B and the contour enhancement process of the luminance signal are performed. The characteristics of these signal processing are
Set by the control signal QC to achieve an image quality improvement effect that matches the viewing environment.

The RGB conversion unit 37 converts the luminance and color difference signals into three primary color signals by a matrix operation. An image display unit 29 of a display having input / output characteristics such as PDP, LCD, and DMD having linear (γ = 1) characteristics.
To display the image.

The viewing environment detecting section 4 detects viewing environment information such as image genre information, viewing area area information, viewing time zone information, and color temperature information. Then, the obtained environment information signal S3 is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The control section 5 determines the characteristics of the image quality improvement signal processing suitable for the viewing environment based on the environment information signal S3, and outputs a control signal QC indicating the characteristics. This operation is similar to that of the above-described embodiment, and the description is omitted.

As described above, according to the present embodiment, it is possible to realize a television receiver which can easily improve the image quality in accordance with the viewing environment, and is effective for improving the image quality of a television image which matches the viewer's sensitivity. It is.

Next, a seventh embodiment of the present invention will be described with reference to the block diagram shown in FIG. This embodiment is suitable for improving image quality and sound quality in accordance with the viewing environment. In the figure, 1 is a video signal demodulation unit, 2 is an image quality improvement processing unit,
3 is an image display unit, 4 is a viewing environment detection unit, 5 is a control unit, 3
Reference numeral 8 denotes a sound quality improvement processing unit, and reference numeral 39 denotes an audio reproduction unit.

The video signal VS is subjected to predetermined demodulation processing in the video signal demodulation unit 1, that is, baseband demodulation of a received broadcast wave,
Performs signal processing such as signal separation and color demodulation. Then, it outputs a demodulated signal S1 (luminance signal Y, color difference signals Cr, Cb).

The image quality improvement processing unit 2 performs signal processing for improving image quality such as contour enhancement, color adjustment, and picture making operation. In this signal processing, characteristics are set by the control signal QC to achieve an image quality improvement effect that matches the viewing environment. And 3
The signal is converted into a primary color signal, and a signal S2 (three primary color signals R, G, B) is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The image display unit 3 is a display such as a CRT having input / output characteristics having γ characteristics, and displays an image of the signal S2 in the form of interlaced scanning.

The viewing environment detecting section 4 detects viewing environment information such as image genre information, viewing area area information, viewing time zone information, and color temperature information. Then, the obtained environment information signal S3 is output. This operation is the same as that of the above-described embodiment, and a description thereof will be omitted.

The control section 5 determines the characteristics of the image quality improvement signal processing suitable for the viewing environment based on the environment information signal S3, and outputs a control signal QC indicating the characteristics. This operation is similar to that of the above-described embodiment, and the description is omitted.

As shown in (Table 2), the sound quality improvement processing section 38 performs a sound creation process suitable for the genre of the image on the audio signal AV. That is, the frequency characteristic is changed by changing the tap coefficient of the transversal filter in accordance with the control signal QC. In the news of No. 4, etc., sound creation with a clear feeling is performed.
This output signal is reproduced by the audio reproducing unit 39. Then, the sound quality is improved in accordance with the viewing environment.

As described above, according to the present embodiment, it is possible to realize a television receiver which can easily improve the image quality and the sound quality in accordance with the viewing environment, and can realize a high-quality television image which matches the viewer's sensitivity. This is effective for improving image quality and sound quality.

Incidentally, also in the second to sixth embodiments,
By adding a sound quality improvement processing unit 38 and an audio reproduction unit 39 similar to those in the seventh embodiment, it is possible to realize a television receiver that can easily improve image quality and sound quality in accordance with the viewing environment. Obvious

[0117]

According to the present invention, signal processing for image quality improvement and sound quality improvement is performed in a form in which viewing environment information and the like are linked. A television receiver can be realized. This is extremely effective in improving the quality and sound quality of a television image that matches the sensitivity of the viewer.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a viewing environment detection unit.

FIG. 3 is a diagram illustrating a configuration example of an image quality improvement processing unit.

FIG. 4 is a characteristic diagram showing one example of a luminance signal nonlinear process and a color difference signal gain process.

FIG. 5 is a diagram illustrating an example of a configuration of a contour correction unit.

FIG. 6 is a block diagram of a second embodiment of the present invention.

FIG. 7 is a block diagram of a third embodiment of the present invention.

FIG. 8 is a block diagram of a fourth embodiment of the present invention.

FIG. 9 is a block diagram of a fifth embodiment of the present invention.

FIG. 10 is a diagram illustrating a configuration example of an image quality improvement processing unit.

FIG. 11 is a block diagram of a sixth embodiment of the present invention.

FIG. 12 is a block diagram of a seventh embodiment of the present invention.

[Explanation of symbols]

1. Video signal demodulation unit, 2, 31, 36 ... Image quality improvement processing unit
3, 27, 29 ... image display unit, 4 ... viewing environment detection unit, 5 ...
Control section, 6 ... Decoding section, 7 ... Program information file section, 8
... Built-in calendar section, 9 ... Color temperature detection sensor section, 10 ...
Remote control unit, 11 environment information setting unit, 12, 13 color difference gain processing unit, 14 luminance non-linear processing unit, 15 characteristic setting unit, 16, 33 outline correction unit, 17, 30, 37 RG
B conversion unit, 18 RGB gain processing unit, 19 edge component extraction unit, 20 nonlinear expansion unit, 21 gain adjustment unit,
22 delay unit, 23 addition unit, 24 transient improvement unit, 25 selection unit, 26 scan conversion unit, 28 inverse γ correction unit, 32 nonlinear processing unit, 34 gain processing unit, 35
... YCrCb conversion section, 38... Sound quality improvement processing section, 39... Audio reproduction section.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noboru Nojima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the multimedia system development headquarters of Hitachi, Ltd. 292 Hitachi Multimedia System Development Division, Hitachi, Ltd. (72) Inventor Kentaro Teranishi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, Japan Multimedia System Development Division Hitachi, Ltd. (72) Takaaki Nishiseto, Kanagawa 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Ltd.Video and Media Division, Hitachi, Ltd. (72) Inventor Satoshi Takahashi 292, Video and Media Division, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture (72) Inventor Yasuhiro Kasahara Totsuka, Yokohama City, Kanagawa Prefecture Yoshida-cho 292 address Co., Ltd., Hitachi video information media business unit

Claims (12)

[Claims] A means for detecting viewing environment information, such as an image genre, a viewing area, a viewing time zone, and a lighting condition, for improving the image quality of a television receiver for improving the sharpness and image quality of a television image; Means for performing a plurality of types of image quality improvement signal processing having different image quality improvement effects, selecting one of the plurality of types of image quality improvement signal processing based on the detected viewing environment information, and selecting an image quality suitable for the viewing environment. An image quality improvement circuit for a television receiver, characterized in that the image quality is improved. 2. The image genre information includes program table information transmitted by text multiplex broadcasting, program information transmitted by data broadcasting, and EPG (Electro Radio) transmitted by digital broadcasting.
2. The image quality improving circuit for a television receiver according to claim 1, wherein the signal is detected by any one of nicProgram Guide) data or a combination thereof. 3. The information of the viewing area includes a code corresponding to a corresponding one of a plurality of prepared area areas.
2. The image quality improvement circuit according to claim 1, wherein the detection is performed by inputting or selecting input information. 4. The image quality improving circuit according to claim 1, wherein the information on the viewing time zone is detected by a calendar function having a built-in clock. 5. The illumination condition information is input or selection of code information corresponding to a corresponding illumination light source among a plurality of illumination light sources prepared in advance, or output signals of a color temperature detection sensor and an illuminance detection sensor. The image quality improvement circuit of a television receiver according to claim 1, wherein the detection is performed by: 6. A plurality of types of image quality improvement signal processing having different image quality improvement effects can be selected by both viewing environment information and a viewer's instruction command, and the latter has priority over the selection. And a function of selecting an image quality improvement signal process corresponding to the instruction command in a time zone within a predetermined time period from the time when the latter instruction command is detected. 6. The image quality improving circuit of the television receiver according to 5. 7. An inverse gamma correction signal processing means for converting a transmission-side gamma-corrected image signal into a linear image signal,
Scanning conversion signal processing means for converting a field image into a frame image by interpolation processing, and means for displaying the frame image on an image display unit having a linear input / output characteristic. An image quality improvement circuit for a television receiver according to claim 1. 8. The circuit according to claim 7, wherein said inverse gamma correction signal processing means is disposed immediately before an image display section. 9. The television according to claim 7, wherein said inverse gamma correction signal processing means is disposed between the means for scanning conversion signal processing and the means before image quality improvement signal processing. Image quality improvement circuit of John receiver. 10. The inverse gamma correction signal processing means according to claim 7 is arranged before the scan conversion signal processing means and the image quality improvement signal processing means and converted by the inverse gamma correction signal processing means. An image quality improving method and circuit for a television receiver, wherein signal processing is performed on a linear image signal by means of scan conversion signal processing means and image quality improvement signal processing means. 11. A means for processing a plurality of kinds of sound improvement signals having different sound effects, wherein one of the plurality of kinds of sound improvement signal processing is selected based on image genre information of the viewing environment information, and the genre of the image is selected. The image quality improvement circuit of a television receiver according to any one of claims 1 to 10, wherein the circuit has a function of creating an appropriate sound. 12. The selection of a plurality of types of sound improvement signal processing having different sound effects can be performed using both the image genre information of the viewing environment information and the instruction command of the viewer. Has the function of selecting the sound improvement signal processing corresponding to the instruction command in a time zone within a predetermined time period from this point when the latter instruction command is detected by the latter. Claim 11
3. The image quality improvement circuit of a television receiver according to item 1.