CN100499827C - Video signal brightness adjusting device and method - Google Patents

Abstract

An adjusting device and method for adjusting brightness of video signal in display for different colors, the device has a color flag generating module for converting multiple color signals into multiple color flags; a brightness adjustment value calculating module for receiving brightness adjustment input values of different colors and color flags to calculate a brightness adjustment output value; and a brightness output module for applying the brightness adjustment output value to a brightness input signal to generate a brightness output signal. The device and the method of the invention can enable a user to respectively adjust the brightness of different colors.

Description

Video signal brightness adjustment device and method

technical field

The invention relates to the field of brightness adjustment of displays. In particular, the present invention relates to an adjustment device and method for adjusting the brightness of a video signal for a specified color in a display, wherein the specified color is determined by a user.

Background technique

The electronic device often displays the processed information through the display, and the user can interact with the electronic device through the displayed information, so as to achieve the purpose of effectively using the electronic device to process information. Computers belong to this type of electronic device.

The types of displays include cathode ray tubes, liquid crystals, light-emitting diodes, and plasma displays, etc., and their sizes vary. Regardless of the type and size of the monitor used, the monitor usually provides various display settings to allow users to select their favorite or suitable display settings, such as color saturation, chroma and brightness settings.

The display signal of a general display includes a brightness signal and a color signal. When setting or adjusting the brightness of a display, the usual brightness adjustment device can only allow the user to adjust the overall brightness, and cannot independently adjust the brightness for a specific color. This significantly limits the possibility for the user to adjust the brightness of the display to his liking, and also limits the display capabilities of the display.

Therefore, for a display that displays video signals, it is indeed necessary to propose a brightness adjustment technology capable of independently adjusting the brightness of a specified color.

Contents of the invention

In view of the above-mentioned problems, an object of the present invention is to provide an adjustment device for adjusting the brightness of a video signal for a specified color in a display. The device can adjust the brightness of one or more colors specified by the user.

Another object of the present invention is to provide an adjustment method for adjusting the brightness of a video signal for a designated color in a display, and a device using the method can adjust the brightness of one or more colors designated by a user.

In order to achieve the above object, the present invention proposes a video signal brightness adjustment device, which includes: a color flag generation module for converting a plurality of color signals into a plurality of color flags; a brightness adjustment value calculation module for receiving multiple A brightness adjustment input value of different colors and the plurality of color flags are used to calculate a brightness adjustment output value; and a brightness output module is used to apply the brightness adjustment output value to a brightness input signal to generate a brightness adjustment output value. Brightness output signal.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the functional block diagram of video signal brightness adjusting device of the present invention;

FIG. 2 is a functional block diagram of a color flag generation module in an embodiment of the present invention;

FIG. 3 is a functional block diagram of a multiplexer in a brightness adjustment value calculation module according to an embodiment of the present invention;

FIG. 4 is a functional block diagram of a built-in circuit in a brightness adjustment value calculation module according to an embodiment of the present invention;

FIG. 5 is a flow chart of the brightness adjustment method of the present invention.

Among them, reference signs:

100 video signal brightness adjustment device

12 Color flag generation module

14 Brightness adjustment value calculation module

16 brightness output module

141 Multiplexer

142 built-in circuit

Detailed ways

The invention discloses an adjustment device and method for adjusting the brightness of video signals for different colors in a display. The embodiments of the technical solution will be further described in detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic block diagram of a video signal brightness adjustment device proposed by the present invention. The video signal brightness adjustment device 100 has a color flag generation module 12 , a brightness adjustment value calculation module 14 , and a brightness output module 16 . The color flag generation module 12 converts the input color signals U _in and V _in (or Cb and Cr) into their corresponding color flags. The conversion method can be improved by checking a pre-designed look-up table. efficiency. Generally, the luminance signal and the color signal received by the display are 8-bit signals. If the look-up table is to correspond to the complete 8-bit color signal, a relatively large memory space is required. Therefore, in an embodiment of the present invention, a smaller size look-up table, such as a 16×16 look-up table, is used to obtain a set of color flags. Fig. 2 is a schematic diagram of the function of the color flag generation module 12 in an embodiment of the present invention. In the color flag generation module 12 of the embodiment, four color flags are obtained through a look-up table by using the upper four bits of the color signal , Flag1, Flag2, Flag3, Flag4.

The brightness adjustment value calculation module 14 can use the user's brightness adjustment input values for different colors to calculate the brightness adjustment output value by using the above-mentioned color flags. In one embodiment, the brightness adjustment value calculation module 14 has at least one multiplexer. Please refer to FIG. 3 , which is a functional diagram of the multiplexer 141 in the brightness adjustment value calculation module 14. The brightness adjustment input value Y _{abj_color} of the color, such as Y _adj-Red , Y _adj-Green , Y _adj-Blue , Y _adj-Cyan , Y _adj-Magenta , Y _adj-yellow, etc., is input into the multiplexer 141, and then The color flags Flag1, Flag2, Flag3, and Flag4 are respectively input into the multiplexer as control signals to obtain an approximate brightness adjustment output value Y _adj-Flagi , and then use a built-in circuit 142, please refer to FIG. 4, to convert the color signals The lower four bits and four approximate brightness adjustment value signals Y _adj-Flagi (i=1, 2, 3 and 4) are input into the built-in circuit 142 to obtain the final brightness adjustment input value Y _{adj_out} . The above built-in circuit may be a two-dimensional linear built-in circuit, or may be composed of three one-dimensional linear built-in circuits. In the embodiment of the present invention, the high-order part of the color signal can be used first, and the corresponding color flag can be generated by the color flag generation module, and the final brightness adjustment value can be obtained by using the built-in circuit, which can greatly reduce the storage lookup table required memory capacity to reduce overall cost.

Finally, the brightness output unit 16 applies the brightness adjustment output value Y _{adj_out} to the brightness input value Y _in to output a brightness output value Y _out . The luminance output unit 16 may include an adder for adding the luminance adjustment output value and the luminance input value Y _in to obtain a final luminance output value Y _out .

The present invention also proposes a video signal brightness adjustment method that can adjust the brightness for different colors, and the method will be described in conjunction with the flow chart of FIG. 5 . Step S501 of the method of the present invention is to convert the input color signal into a set of color flags, wherein the input color signal can be U _in and Vin _{or Cbin} and Cr _in , and the commonly used color signal is an 8-bit signal, and this conversion can be done using a look-up-look-up table. As explained above, in order to save memory space, in one embodiment of the present invention, a look-up table with a smaller size is used instead of a look-up table that can completely correspond to an 8-bit signal, and then the upper bits in the color signal are used Part, look up the table to get a set of color flags.

In step S502, a brightness adjustment output value is calculated through the brightness adjustment input values and color flags of different colors input by the user. In one embodiment of the present invention, the brightness adjustment input values and color flags of different colors input by the user are input into a multiplexer to obtain a set of approximate brightness adjustment output values, and then use a built-in circuit , calculate the final brightness adjustment output value with this group of approximate brightness adjustment output values and the low-order part of the color signal.

In step S503, the brightness adjustment output value is applied to a brightness input value to obtain a brightness output value. In one embodiment, the brightness adjustment output value is added to the brightness input value to obtain the brightness input value.

The brightness adjustment device and method of the present invention have been described above in detail through preferred embodiments, but those who are familiar with the art can easily modify it without departing from the scope of the spirit of the present invention, such as the color flag look-up table Can be stored in a location other than an external memory; the number of bits of the color signals can be more than eight, and the number of signals can be more than two; the brightness adjustment value signals input by the user can be not only the examples in the embodiments of the description The multiplexer can be replaced by other equivalent units; and the two-color signal can be asymmetrical in the selection of high and low bits.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (14)

1. A video signal brightness adjustment device, characterized in that, comprising: A color flag generation module, used to convert multiple color signals into multiple color flags; A brightness adjustment value calculation module, which receives a plurality of brightness adjustment input values of different colors and the plurality of color flags to calculate a brightness adjustment output value; and A brightness output module is used for applying the brightness adjustment output value to a brightness input signal to generate a brightness output signal. 2. The video signal brightness adjustment device according to claim 1, wherein the signal conversion of the color flag generating module can be completed by a look-up table. 3. The video signal brightness adjustment device according to claim 1, wherein the plurality of color signals are U and V. 4. The video signal brightness adjustment device according to claim 1, wherein the plurality of color signals are Cb and Cr. 5. The video signal brightness adjustment device according to claim 1, wherein the brightness adjustment value calculation module comprises at least one multiplexer and a built-in circuit. 6. The video signal brightness adjustment device as claimed in claim 1, wherein the color signal is an M-bit signal, and the color flag generating module utilizes N bits of the color signal to obtain the color flag, M and N are both natural numbers, and M is greater than N. 7. The video signal brightness adjustment device according to claim 1, wherein the brightness output module comprises an adder for adding the brightness adjustment output value and the brightness input signal. 8. A video signal brightness adjustment method, is characterized in that, comprises the following steps: converting multiple color signals into multiple color flags; calculating a luminance output value by adjusting input values of luminance of a plurality of different colors and the plurality of color flags; and The brightness adjustment output value is applied to a brightness input signal to generate a brightness output signal. 9. The method for adjusting brightness of a video signal according to claim 8, wherein the output of the plurality of color flags is achieved by checking a look-up table. 10. The method for adjusting brightness of a video signal as claimed in claim 8, wherein the calculation of the brightness adjustment output value is completed by at least one multi-tasking processor and a built-in circuit. 11. The method for adjusting brightness of a video signal according to claim 8, wherein the plurality of color signals are U and V. 12. The method for adjusting brightness of a video signal according to claim 8, wherein the plurality of color signals are Cb and Cr. 13. The video signal brightness adjustment method according to claim 8, wherein the color signal is an M-bit signal, and the color flag is obtained by using the N-bit of the color signal, and M and N are both positive Integer, and M is greater than N. 14. The video signal brightness adjustment method according to claim 8, wherein the brightness output signal is generated by adding the brightness adjustment output value to the brightness input signal.

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