An Adaptive Black Level Correction Method

A black level correction and black level technology, which is applied in the field of image processing, can solve the problems of image quality that needs to be improved, less parameters, and inaccuracy, and achieves the effect of reducing the influence of contrast, enhancing image contrast, and improving image quality.

Active Publication Date: 2019-01-18
SHENZHEN HIGHGREAT TECH DEV CO LTD
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Problems solved by technology

Although the influence of different color channels on the accuracy of black level correction is considered, the parameters considered are too few and not accurate enough, and the image quality still needs to be improved

Method used

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  • An Adaptive Black Level Correction Method
  • An Adaptive Black Level Correction Method
  • An Adaptive Black Level Correction Method

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Embodiment 1

[0062] Please refer to figure 1 , Embodiment 1 of the present invention is:

[0063] An adaptive black level correction method, the method is:

[0064] S1 obtains the original image under the total black environment under different exposure times and gains, calculates the black level calibration value of each color channel in the original image obtained under the total black environment, and stores it;

[0065] S2 acquires the current image, as well as the current exposure time and the current gain;

[0066] S3 uses the linear interpolation method to calculate the current black level calibration value of each color channel corresponding to the current exposure time and the current gain according to the stored black level calibration values ​​under different exposure times and gains;

[0067] S4 performs black level correction on the current image by using the current black level calibration values ​​of the respective color channels.

[0068] Wherein, the data format of the ...

Embodiment 2

[0069] Please refer to Figure 1 to Figure 4 , the second embodiment of the present invention is:

[0070] An adaptive black level correction method, on the basis of Embodiment 1, specifically:

[0071] 1. Please refer to figure 2 , in step S1, under different exposure times and gains, the original image in a completely black environment is obtained, and the black level calibration value of each color channel in the obtained original image in a completely black environment is calculated, specifically:

[0072] S11 preset minimum exposure time, maximum exposure time, minimum gain, maximum gain, exposure time increase threshold, gain increase threshold;

[0073] S12 adjusts the exposure time to the minimum exposure time, adjusts the gain to the minimum gain, and stores it;

[0074] S13 acquires the original image in a completely dark environment;

[0075] S14 calculates and stores the black level calibration value of each color channel of the original image acquired in a co...

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Abstract

The present invention provides a method of adaptive black electricity correction. The method is: S1 obtains the original images in a full black environment under different exposure time and gain, calculate each of the original images obtained in the original image of the whole black environment.The color channel of the color channel and storage; S2 obtains the current image, and the current exposure time and the current gain; the S3 is calculated based on the quasi -value of the black electric flat school under different exposure time and gain under different exposure and gain.Current exposure time and the current black -electric flat school accuracy of each color channel corresponding to each color channel; S4 uses the current black -electric flat school accuracy of each color channel to correct the current image.The method can adapt the black level of each pixel point according to different exposure time and gain, and strong anti -interference ability.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an adaptive black level correction method. Background technique [0002] In recent years, CMOS (Complementary-metal-oxide-semiconductor) image sensors, which have the advantages of small size, low power consumption, and low cost, have become more and more popular in the market, and are widely used in digital cameras, driving recorders, and sports cameras. in video products. In order to make the image closer to the real effect of the human eye, the camera's image processing chip will perform a series of processing on the image signal of the CMOS image sensor, including black level correction. [0003] Usually in a completely dark environment, the image sensor does not sense light, but the image signal at this time is not a zero value, which results in a black level. The traditional black level correction method is to set an offset value to The image signal is corrected ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/361H04N5/374
CPCH04N25/63H04N25/76
Inventor 高建民
Owner SHENZHEN HIGHGREAT TECH DEV CO LTD
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