Method for rectifying missing pixels and image sensor

A correction method and dead point technology, which is applied in the field of image processing, can solve problems such as poor images, correction limitations of dead points, unsuitability for cameras, etc., and achieve the effect of improving image quality and accurate judgment of dead points

Active Publication Date: 2013-12-25
深圳市三宝创新机器人有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of dead pixels is one of the reasons for the decline in image quality. At the same time, due to the increase of dead pixels, the image will be worse in low-noise environments, which affects the use of high-definition products.
The traditional dead pixel correction method adopts the method of power-on initialization once to determine

Method used

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  • Method for rectifying missing pixels and image sensor
  • Method for rectifying missing pixels and image sensor
  • Method for rectifying missing pixels and image sensor

Examples

Experimental program
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Embodiment 1

[0046] Such as Figures 1 to 3 As shown, the image dead point correction method of the present embodiment includes:

[0047] Establish a 5×5 Bayer color matrix with the pixel to be detected as the center pixel;

[0048] According to the color value change of surrounding pixels of the same color that are alternate rows and columns of the central pixel, the bad point judgment is performed on the surrounding pixels of the central pixel of the 5×5 Bayer color matrix;

[0049] Correct the pixels judged as bad pixels;

[0050] Taking the surrounding pixel points of the central pixel point as reference points, it is judged whether the difference between the color value of the central pixel point and the surrounding pixel points is greater than a first threshold, and if so, the central pixel point is Bad point, if not, the central pixel point is a normal point;

[0051] Perform image correction on the central pixel judged to be a bad pixel.

[0052] In this embodiment, the method ...

Embodiment 2

[0073] The image sensor of this embodiment includes an image dead point correction unit, wherein the image dead point correction unit includes:

[0074] Adjacent creating unit, used to set up a 5×5 Bayer color matrix with the pixel to be detected as the central pixel;

[0075] A judgment preprocessing unit, configured to perform bad point judgment on the surrounding pixels of the central pixel of the 5×5 Bayer color matrix according to the color value changes of surrounding pixels of the same color that are alternate rows and columns of the central pixel ;

[0076] A bad point determination unit, configured to use the surrounding pixels of the central pixel as reference points to determine whether the difference between the color value of the central pixel and the surrounding pixels is greater than a first threshold, if so , then the center pixel is a bad point, if not, the center pixel is a normal point;

[0077] The dead point correction unit is used to perform image corre...

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Abstract

The invention discloses a method for rectifying missing pixels and an image sensor. The method for rectifying missing pixels and the image sensor are efficient and accurate. According to the method for rectifying missing pixels, a 5*5Bayer color matrix is established with a pixel to be detected as a center pixel. Firstly, missing pixel rectifying is performed on pixels surrounding the center pixel of the 5*5Bayer color matrix; the pixels surrounding the center pixel of the 5*5Bayer color matrix server as reference points and whether the differential values between the color value of the center pixel and the color values of the surrounding pixels are larger than a first threshold value or not is judged, if yes, the center pixel is determined as a missing pixel and if not, the center pixel is determined as a normal pixel; the center pixel determined as the missing pixel undergoes image rectifying. The method for rectifying missing pixels is accurate in judgment of missing pixels, high in speed and good in effect of rectifying missing pixels.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image dead point correction method and an image sensor. Background technique [0002] At present, the security industry has entered the high-definition era, and the use of CMOS sensors with a resolution of one million has become a trend. Due to the limitations of the image sensor manufacturing process, CMOS sensors will have more and more dead pixels in the image under long-term and high-temperature environments. The so-called dead pixels refer to a color that does not change with the light sensitivity and always presents a color (for example, white, black or color). pixels, thereby destroying the clarity and integrity of high-definition images. The existence of dead pixels is one of the reasons for the decline in image quality. At the same time, due to the increase of dead pixels, the image will be worse in low-noise environments, which affects the use of high-defin...

Claims

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Application Information

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IPC IPC(8): H04N5/357
Inventor 庄永军吴乘跃
Owner 深圳市三宝创新机器人有限公司
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