Image brightness correction method and circuit

Abstract

This invention discloses an image brightness correction method and circuit. The image brightness correction method includes the following steps: (a) converting the original image from the grayscale domain to the gamma domain; (b) performing spatial jitter calculation in the gamma domain to fit the original brightness of a specific range in the gamma domain to a preset brightness to generate a corrected image; and (c) converting the corrected image from the gamma domain back to the grayscale domain.

Claims

1. An image brightness correction method, comprising the following steps: (a) converting an original image from a grayscale domain to a gamma domain; (b) performing a spatial jitter calculation in the gamma domain to fit an original brightness of a specific interval in the gamma domain to a preset brightness to generate a corrected image; and (c) converting the corrected image from the gamma domain back to the grayscale domain; wherein, Step (a) involves dividing the original image into multiple compensation blocks and performing calculations to convert it from the grayscale domain to the gamma domain. The spatial jitter calculation in step (b) includes: looking up a table based on the set Display Brightness Value (DBV) binding point and the current grayscale value to obtain an energy allocation weight, and giving different percentage transfers to the plurality of compensation blocks.

2. The image brightness correction method as described in claim 1, wherein the corrected image maintains brightness energy conservation with respect to the original image.

3. The image brightness correction method as described in claim 1 is applied to a display driver integrated circuit of a display panel.

4. The image brightness correction method as described in claim 1, wherein the spatial jitter calculation in step (b) further includes: Based on the energy allocation weight and the size of the original image, an energy movement direction and an energy movement ratio are calculated to achieve gradual energy transfer.

5. The image brightness correction method as described in claim 4, wherein the energy movement direction is a custom direction based on the original image or the original maximum energy direction of the original image.

6. The image brightness correction method as claimed in claim 1, wherein step (b) is to fit the original brightness of the specific range to the preset brightness in a single-point high brightness manner.

7. The image brightness correction method as claimed in claim 1, wherein the specific interval of the gamma domain in step (b) is a plurality of DBV binding point intervals corresponding to a gamma curve of the original image, and different DBV binding point intervals are respectively given corresponding compensation capabilities.

8. The image brightness correction method as described in claim 7, wherein the corresponding compensation capability includes at least one of the following: compensation start point and end point, lateral leakage current filling capability, compensation block size, and linear interpolation compensation parameters.

9. An image brightness correction circuit, comprising: A first conversion module, configured to convert an original image from a grayscale domain to a gamma domain; a jitter calculation module, coupled to the first conversion module, configured to perform spatial jitter calculation in the gamma domain to fit an original brightness of a specific interval in the gamma domain to a preset brightness to generate a corrected image; a second conversion module, coupled to the jitter calculation module, configured to convert the corrected image from the gamma domain back to the grayscale domain; a block generation module, coupled to the first conversion module, configured to divide the original image into a plurality of compensation blocks and transmit them to the first conversion module; and a weight generation module, coupled between the first conversion module and the jitter calculation module, configured to generate an energy allocation weight in the gamma domain based on a DBV weight and a grayscale weight, and assign it to the jitter calculation module to give different percentage transfers within the plurality of compensation blocks.

10. The image brightness correction circuit as claimed in claim 9, wherein the corrected image maintains brightness energy conservation with respect to the original image.

11. The image brightness correction circuit as described in claim 9 is applied to a display driver integrated circuit of a display panel.

12. The image brightness correction circuit as claimed in claim 9, wherein the jitter calculation module further calculates an energy movement direction and an energy movement ratio based on the energy allocation weight and the size of the original image, so as to achieve gradual energy transfer.

13. The image brightness correction circuit as claimed in claim 12, wherein the energy movement direction is a custom direction based on the original image or the original maximum energy direction of the original image.

14. The image brightness correction circuit as claimed in claim 9, wherein the jitter calculation module fits the original brightness of the specific range to the preset brightness in a single-point high brightness manner.

15. The image brightness correction circuit as claimed in claim 9, wherein the specific interval of the gamma domain is a plurality of DBV binding point intervals on a gamma curve corresponding to the original image, and different DBV binding point intervals are respectively given corresponding compensation capabilities.

16. The image brightness correction circuit as claimed in claim 15, wherein the corresponding compensation capability includes at least one of the following: compensation start and end points, lateral leakage current filling capability, compensation block size, and linear interpolation compensation parameters.

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