CN1744722A - Digital image quality adjustment device and method thereof - Google Patents

Abstract

The device and method can estimate difference between original image and adjusted image. The device includes following parts: horizontal/vertical hold signal processor for providing horizontal/vertical hold signal, which is related to size of image plane adjusted to what user wanted; sharpness adjustment device for receiving signals sent from the horizontal/vertical hold signal processor, and adjusting sharpness of image; adjuster of image quality for receiving signals sent from the horizontal/vertical hold signal processor, and adjusting image quality: brightness, dark and light, color and hue except sharpness. Selecting part of image, the invention can adjust sharpness, brightness, dark and light, color and hue of image. Moreover, by comparing with images around, the invention can control and adjust image quality.

Description

Digital image quality adjustment device and method thereof

technical field

The invention relates to digital image quality adjustment, in particular to a device and method for objectively judging and adjusting image differences by providing images with adjusted image quality.

Background technique

Existing digital TV performs digital image quality adjustment on the entire displayed image. That is, in order to adjust the image quality of the entire image that the user is watching, as shown in Figure 1, the OSD screen is used to select the image quality that the user is satisfied with.

In this way, when the user wants to change the adjustment variable of the image quality, he must remember what the existing image looks like, so that the user can compare the existing image and choose the image quality that suits him, but it is quite difficult to do this of.

In addition, as shown in FIG. 1 , the existing OSD screen is located in the center of the entire viewing screen, covering important images, so the user feels the image changes in the remaining display screens, which is also very inconvenient.

There is another problem, when developing a digital TV receiver, based on adjusting the luminance signal component of the digital TV output image—definition, how much effect can it play on the adjustment of the definition, and judge whether it can be normally pressed Planning is carried out, which is carried out according to the subjective judgment of the developer of the digital TV receiver.

That is, when judging how the luminance information has become compared to the existing image, because the same receiver is used to distinguish the sharpness adjustment image from the existing image, or to remember the previous image to adjust and distinguish the sharpness Therefore, the adjustment of the image has to be realized according to the subjective judgment of the developer of the digital TV receiver.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention designs and provides a device and a device that can adjust and control the brightness and clarity of the contour line image that is different from the usual image, and can select and modify appropriate brightness information and clarity variables. method.

Another object of the present invention is to provide an image quality adjustment method that can take a part of the entire image as an adjustment object, compare surrounding images, and perform image quality adjustment.

In order to achieve the above-mentioned purpose, only adjust a part of the image that the user wishes to adjust in the entire image, the digital image quality adjuster of the present invention includes: a horizontal/vertical signal that is used to provide a horizontal/vertical synchronous signal related to the picture size that the user wishes to adjust Synchronous signal processor; used to receive the synchronous signal sent by the above-mentioned horizontal/vertical synchronous signal processor and adjust the sharpness adjustment device for image definition; used to receive the synchronous signal sent by the above-mentioned horizontal/vertical synchronous signal processor and adjust the Image quality adjusters for image quality such as brightness, shading, color, and hue other than sharpness.

The sharpness adjustment device is composed of a pre-filter adjuster for performing simple sharpness adjustment processing on the horizontal and vertical components of the above-mentioned image, and a post-filter for performing detailed sharpness adjustment processing on the horizontal component of the above-mentioned image.

The image quality adjuster includes a sharpness adjustment device for adjusting the sharpness of the image, and the above-mentioned sharpness adjustment device also includes: a filter for filtering the brightness signal of the above-mentioned image signal, and only extracting the image contour line component; through the above-mentioned filter The signal and buffer, the adder that calculates and delays the input luminance signal; receives the signal selected by the receiver developer or user and outputs only the above-mentioned filtered signal image contour line, and outputs the above-mentioned input luminance signal and the above-mentioned calculation and clearness A selector to choose between adjusted image signals.

The above-mentioned filter realizes its function through a pulse sharpening band filter or a band-pass filter.

According to the digital image quality adjustment method of the present invention, in order to only adjust a part of the image desired by the user in the entire image, it includes: receiving the phase of horizontal and vertical synchronous signals related to the picture size that the user wants to adjust; In the interval, the processing stage of sharpness adjustment and image quality adjustment.

According to the present invention, the sharpness adjustment method for adjusting the sharpness of an image includes the following stages: in order to extract the contour line of the above-mentioned image, a stage of filtering is performed; through the above-mentioned input image contour line, the user or receiver developer can adjust the above-mentioned filtering stage. The method of filtering coefficients, the stage of adjusting the sharpness of the image.

The digital picture quality adjuster and method thereof according to the present invention have the following effects.

First, provide an image after sharpness adjustment for the luminance component of the input graphics, and based on this, provide a device capable of finer and more precise sharpness adjustment, and improve the performance of the image quality.

Second, it can provide a device to adjust the definition, brightness, light and shade, color, and tone, select a part of the entire image screen, and output it together, and compare it with the surrounding images to achieve image quality adjustment control .

Description of drawings

FIG. 1 is a schematic diagram of an OSD for image quality adjustment in an existing digital TV;

Fig. 2 is the overall block diagram of the digital image quality adjuster according to the present invention;

Fig. 3 is a block diagram of a sharpness adjustment device according to the present invention;

Fig. 4 is a block diagram of a sharpness adjustment device according to the present invention;

Fig. 5 is a schematic diagram of filtering according to the clarity adjusting device of the present invention;

Fig. 6 is a block diagram of an image quality adjuster according to the present invention;

7 is a schematic diagram of an embodiment of a digital image quality adjuster according to the present invention;

Figure 8 is a schematic diagram of another embodiment of the digital image quality adjuster according to the present invention.

*Symbol Description*

100: Clarity adjustment device 110: Pre-filter regulator

120: post-filter adjuster 200: image quality adjuster

300: Horizontal/vertical synchronous signal processor

Detailed ways

The constitution and function of the present invention will be described below based on idealized embodiments of the present invention with reference to the accompanying drawings.

Fig. 2 is an overall block diagram of the digital image quality adjuster according to the present invention.

As shown in FIG. 2 , the digital image quality adjuster according to the present invention is composed of a definition adjustment device 100 , an image quality adjuster 200 , and a horizontal/vertical synchronous signal processor 300 .

The sharpness adjustment device 100 is used to input and receive the information of the original image, and then adjust the sharpness;

The image quality adjuster 200 is used to adjust digital image quality such as brightness, light and shade, chromaticity, hue, etc. other than the above-mentioned definition;

The horizontal/vertical synchronization signal processor 300 is used to input a certain range of horizontal/vertical synchronization signals to the definition adjustment device 100 and the image quality adjuster 200 .

This structure operates by acquiring actual image size information from the horizontal/vertical synchronous signal and adjusting the horizontal/vertical synchronous signal within an effective range.

In detail, the horizontal and vertical synchronous signals of the actual image are obtained, the size of the image range that the user wants to adjust is received, and the horizontal and vertical synchronous signals of the actual image are processed into a synchronous signal corresponding to the size of the image range that the user wants to adjust. The image information whose image quality has been adjusted is transmitted to the valid interval through the synchronized signal, and the currently input image data is output to the invalid interval. Using the method described above, an image with only a portion of it adjusted can be obtained.

In addition, only the contour line components of the image are extracted and output through the sharpness adjustment device 100 , so that receiver developers or users can adjust the sharpness of the image more precisely, and provide objective adjustment basis for operation.

According to the digital image quality adjuster of the present invention, the detailed structure of the digital image quality adjuster will be described below.

Fig. 3 is a block diagram of a sharpness adjusting device according to the present invention.

FIG. 3 shows a block diagram of the sharpness adjustment device 100 in FIG. 2 . As shown in FIG. 3 , it is composed of a composite filter structure of a pre-filter adjuster 110 and a post-filter adjuster 120 .

The pre-filter adjuster 110 performs simple sharpness adjustment processing on the horizontal and vertical components of the input image, and the post-filter adjustment device 120 performs detailed sharpness adjustment processing on the horizontal components. The order of the above-mentioned pre-filter adjuster 110 and post-filter adjuster 120 can also be changed if necessary.

The detailed composition and operation process of the above-mentioned pre-filter regulator 110 has been described in detail in the filed Korean Patent No. 10-0344807, and the structure and function thereof will not be repeated here.

Hereinafter, the detailed configuration of the post-filter adjustment device 120 will be described with reference to FIG. 4 .

The post-filter conditioning device 120 includes the following components:

For the input luminance signal, according to the filter coefficient, perform pulse bandpeaking or passband (band pass) filtering, and output the filter 121 of the filtered signal;

A filter error remover 122 for removing an error component generated after filtering from the above-mentioned filtered signal:

A weighter 123 for giving weighted values according to weighted value coefficients and emphasizing high-frequency components in the above-mentioned passband filtered signal;

Postponing the above-mentioned filter signal through the buffer memory 125, and an adder 124 for accounting;

According to the receiver developer or user, selector 127 for selecting between receiving the selected signal and outputting only the above-mentioned filtered signal image contour line, and outputting the above-mentioned input luminance signal and the above-mentioned calculated and adjusted image signal.

In detail, the filter 121 in FIG. 4 uses a filter structure that is not limited to unsharp masking, and is designed to only give weighted filter coefficients to contour lines, so that the definition of brightness components can be obtained. A pulse sharpening band filter, or a band pass filter that can adjust the sharpness only for the frequency comparison at the contour line position.

As shown in Figure 5, the brightness component adjustment method using the above filter is to extract the high-frequency components of the image that control the sharpness, that is, the contour line components of the image, and give weighted values. Therefore, the core basis of the sharpness adjustment is to be able to Correctly extract the filter coefficient or filter structure of the image contour.

When receiver developers or users use this filter structure and adjust the definition, they will have a subjective judgment on improving the clarity of the luminance component of the input image, but with the filter coefficient or filter structure currently selected, the high-frequency The composition, that is, the contour line composition does not know how accurate it can be.

In order to solve this problem, the output value of the above-mentioned filter 121 utilizes the contour line component which is the high-frequency component of the image.

In detail, when the sharpness adjustment is normally processed, a weighting value is set in the above-mentioned contour line component, so that the high-frequency component of the set weighting value can be added to the existing luminance component that is delayed, and An image whose resolution has been adjusted can be acquired.

Moreover, when adjusting the contour line components, the above-mentioned high-frequency components whose weighting values are set are not calculated with the original luminance components, but directly passed.

If only the above-mentioned contour line components are passed through, the region without high-frequency components passes through the filter 121, the DC standard is reduced to 0, and only high frequencies are left. Therefore, as shown in the picture of extracting the contour line components in Figure 2, the background display is black, the contour is composed only of high-frequency components, and is output.

That is to say, when a section of filter coefficient is used in the sharpness adjustment, if the same operation mode as above is selected for the screen image to be adjusted, only the extracted image contour components will be displayed on the monitor. Therefore, an objective basis can be provided to receiver developers or users for more precise adjustment of filter coefficients.

FIG. 6 shows the composition and operation of the image quality adjuster 200 in FIG. 2 .

Fig. 6 is a detailed block diagram of the image quality adjuster according to the present invention. As shown in Fig. 6, each adjustment device 210, 220, 230, 240 receives and adjusts the brightness, light and shade, color, and tone except for sharpness. Device-related parameters (parameters), and adjust them.

At this time, as described above, the image quality adjuster 200 acquires the horizontal and vertical synchronization signals of the actual image from the horizontal/vertical synchronization signal processor 300, receives the size of the image range that the user wants to adjust, and converts the horizontal and vertical synchronization signals of the actual image It is processed into a synchronous signal corresponding to the size of the image range that the user wants to adjust, and the processed synchronous signal transmits the image information whose image quality has been adjusted to the effective interval.

Existing digital TVs are adjusted for the entire picture, and according to the user's judgment on the image before adjustment, it is judged to what extent the adjusted picture quality has reached. However, if the function of the present invention is used, the image whose image quality has been adjusted is displayed separately from the surrounding images, so it is possible to intuitively know to what extent the image quality has changed.

In addition, for the black bands on the top, bottom, left and right of the screen and artificial images such as DVD images that coexist with the original image, if the horizontal/vertical sharpness adjustment is excessive, the black in the black band and the pixel values that make up the image will change sharply , and there will be a ringing phenomenon indicating that the sharpness adjustment of the boundary part is invalid up, down, left, and right. Using the above function, this problem is solved.

That is, as shown in FIG. 7, the DVD image is displayed in black in the screen in order to conform to the screen ratio. At this time, the partial image quality processing according to the present invention eliminates the ringing phenomenon occurring in the peripheral part.

Fig. 8 is a diagram of another embodiment of the digital picture quality adjuster according to the present invention. Figure 8 shows that after the OSD screen is composed of a transparent rectangular frame, with a part of the image in the entire image as the object, the indicators showing the four parameters of brightness, brightness, color, and sharpness can be moved up, down, left, and right, and the comparison can be intuitively displayed The image after the quality adjustment of the surrounding image.

Through the above description, relevant professionals can make various changes and modifications within the scope of not departing from the technical idea of the present invention. Therefore, the technical scope of this invention is not limited to the detailed description in the specification, but should be determined according to the scope of rights of the patent application.

Claims (6)

1. A digital image quality adjustment device, which is used to adjust only a part of the image that the user wishes to adjust in the entire image, which includes: A horizontal/vertical synchronization signal processor for providing horizontal/vertical synchronization signals related to the screen size desired by the user; A sharpness adjustment device for receiving the synchronous signal sent by the above-mentioned horizontal/vertical synchronous signal processor and adjusting the sharpness of the image; An image quality adjuster used to receive the synchronous signal sent by the above-mentioned horizontal/vertical synchronous signal processor and adjust the image quality such as brightness, light and shade, color, hue, etc. other than the above-mentioned definition. 2. The digital image quality adjustment device according to claim 1, wherein the definition adjustment device comprises: A prefilter adjuster for simple sharpness adjustment processing of the horizontal and vertical components of the above image; A post filter that performs fine sharpness adjustment processing on the horizontal components of the above image. 3. The digital image quality adjustment device according to claim 1, characterized in that the definition adjustment device comprises: A filter for filtering the brightness signal of the above-mentioned image signal in order to extract the image contour line component; An adder that calculates the delayed input luminance signal through the above-mentioned filtered signal and buffer; According to the receiver developer or user, a selector for selecting between receiving the selected signal and outputting only the above-mentioned filtered signal image contour line, and outputting the above-mentioned input brightness signal through the above-mentioned calculation and the image signal through the definition adjustment. 4. The digital image quality adjustment device according to claim 3, wherein the filter is a pulse sharpening band filter or a band pass filter. 5. A digital image quality adjustment method, which is used to adjust only a part of the image that the user wishes to adjust in the entire image, which includes: The stage of receiving horizontal and vertical synchronous signals related to the picture size to be adjusted by the user; In the period in which the synchronous signal is valid, the processing stages of definition adjustment and image quality adjustment are performed. 6. The digital image quality adjustment method according to claim 5, characterized in that, the definition adjustment method comprises: In order to extract the contour line components of the above image, a stage of filtering is carried out; A stage that outputs the contour line component of the filtered image; Based on the outputted image contour, the user or receiver developer adjusts the stage of image clarity by adjusting the filter coefficient of the above-mentioned filtering stage.

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