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Method and device for bad pixel compensation

A bad pixel and pixel technology, applied in the field of bad pixel compensation, can solve problems such as poor image quality, bad pixel compensation processing effect, side effects, etc., to achieve proper bad pixel compensation, good image quality, and maintain image quality Effect

Active Publication Date: 2014-04-16
SILICON MOTION INC (CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: once its design is too simplified, it often has side effects, making the image quality poor
In particular, traditional image processing circuits do not do well with bad pixel compensation

Method used

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  • Method and device for bad pixel compensation
  • Method and device for bad pixel compensation

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Embodiment Construction

[0028] Please refer to Figure 1A , Figure 1A It is a schematic diagram of a device 100 for bad pixel compensation according to a first embodiment of the present invention. The device 100 includes an image sensor 105 and a processing circuit 110 , and the processing circuit 110 includes a detection module 112 and a compensation module 114 . According to this embodiment, the processing circuit 110 receives at least one image signal S1 representing an image from the image sensor 105 , and performs bad pixel compensation on the image, wherein the image is a Bayer pattern image. Such as Figure 1A As shown, the processing circuit 110 can output at least one image signal S2 carrying the compensated image. In addition, the detection module 112 can perform detection to generate a plurality of detection values, and the compensation module 114 can selectively perform bad pixel compensation on a target pixel according to at least a part of the detection values. During actual operation...

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Abstract

The invention discloses a method for bad pixel compensation. The method includes the steps of calculating the sum of the absolute value of differences of a plurality of first pixel values close to an object pixel in an image based on each direction of multi-directions, wherein the sum serves as a first detection value; calculating the sum of the absolute value of differences of a plurality of second pixel values close to the object pixel based on each direction of at least a part of the directions, wherein the sum serves as a second detection value, and each of the plurality of first pixel values and each of the plurality groups of second pixel values include two pixel values corresponding to a difference value; and selectively compensating bad pixels for a specific direction in the multi-directions based on the first detection value and the second detection value. The invention also provides a relevant device. Bad pixels can be well compensated. Even under a condition that only low-end hardware resources can be adopted, the fine image quality can be maintained according to the invention.

Description

technical field [0001] The invention discloses image processing of a Bayer Pattern image, especially a method and a related device for compensating bad pixels. Background technique [0002] The image produced by the image sensor in a PC Camera is usually a Bayer Pattern image. According to related technologies, any sensing unit of the image sensor can only generate pixel values ​​belonging to a color channel (Color Channel) among the pixel values ​​of a corresponding pixel. For example: a complete color channel should include red, green, and blue color channels, and any sensing unit of the image sensor can only produce one of the red, green, and blue pixel values ​​of a corresponding pixel, The other two pixel values ​​among the red, green, and blue pixel values ​​need to be generated through image processing. [0003] In order to reduce material costs, traditional image processing circuits often use low-end hardware resources, resulting in many problems. For example: Onc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/367
Inventor 陈永纬
Owner SILICON MOTION INC (CN)
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