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Method for removing color deviation in the image generated because of high and low brightness

An image, brightness technology, applied in the direction of brightness and chrominance signal processing circuits, etc., can solve the problems of image distortion, inconvenience and defects, color shift, etc.

Inactive Publication Date: 2007-11-28
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] However, when using a digital camera to take pictures, it is often found that there will be a color cast in high-brightness or low-brightness areas
In particular, when it is necessary to use the color matrix to enhance color reproduction (color reproduction), the color cast of high-brightness saturation and low-brightness noise will often become more obvious, so the original image only needs a slight color cast, it will be can cause serious image distortion
[0004] It can be seen from the above that the color shift phenomenon produced by known digital cameras obviously has inconvenience and defects in actual use and needs to be improved.

Method used

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  • Method for removing color deviation in the image generated because of high and low brightness
  • Method for removing color deviation in the image generated because of high and low brightness
  • Method for removing color deviation in the image generated because of high and low brightness

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Embodiment Construction

[0011] Please refer to Fig. 1, the present invention provides a method for eliminating the color cast caused by high and low luminance in an image. The steps include: first, converting an image data into a frequency domain with luminance and chrominance signals (S100 ), wherein the frequency domain can be YUV domain (YUV domain), Lab frequency domain (Lab domain), or any frequency domain with luminance and chrominance signals.

[0012] Next, set the brightness upper limit and lower limit to be adjusted, the upper limit brightness adjustment ratio for brightness greater than or equal to the brightness upper limit, and the adjustment ratio for brightness less than or equal to the brightness lower limit. The lower limit brightness adjustment ratio and the linear brightness adjustment ratio that needs to be adjusted for the brightness between the brightness upper limit value and the lower limit value (S102).

[0013] Then, judge the relationship between the brightness of each pixe...

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Abstract

This invention discloses a method for eliminating color shift generated by high-low brightness in images including: converting image data into a frequency domain with luminance and chrominance signals then to just based on the brightness of pixels of different points to adjust the chrominance of each point pixel to further eliminate color shift of high and low brightness, further more, a linear format is used to eliminate chrominance, and the change is asymptotic therefore no fault phenomenon appears.

Description

technical field [0001] The invention relates to a method for eliminating the color cast caused by high and low brightness in an image, in particular to a method for converting image data into a frequency domain with brightness and chrominance signals, and then judging according to the brightness of different pixels , to adjust the chromaticity of each pixel. Background technique [0002] There are many ways for people to commemorate good times, among which photos are the most frequently used, because no matter it is travel, party or even all memorable moments, they can be recorded by cameras for users to recall in the future. Furthermore, based on digital camera (digital camera) has the convenience of transmitting the captured image data to electronic equipment (such as a computer) for modification and processing, and its price is gradually decreasing, so the use of digital camera The number of people is increasing day by day. [0003] However, when using a digital camera ...

Claims

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Application Information

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IPC IPC(8): H04N9/77
Inventor 邱俊达
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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