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Detection method of image sensing of bad pixel

An image sensing and detection method technology, applied in image communication, color TV parts, TV system parts, etc., can solve the problem of image sensor defective pixels or dead pixels, new frequencies, and dead pixels mistaken for edges video, etc.

Active Publication Date: 2014-11-05
HIMAX IMAGING LIMITED
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even though the Bayer pattern interpolation method is commonly used in the field of image processing, it has some disadvantages, such as the disappearance of high-frequency details due to the phenomenon of color aliasing, and even the generation of new frequencies that seriously destroys the image
[0005] Additionally, image sensors often have defective or dead pixels
The traditional interpolation method cannot effectively distinguish between dead pixels and edge images, so it is easy to misjudge edge images as dead pixels, or mistake bad pixels for edge images

Method used

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  • Detection method of image sensing of bad pixel
  • Detection method of image sensing of bad pixel
  • Detection method of image sensing of bad pixel

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Embodiment Construction

[0034] figure 2 Shows a flowchart of a method for detecting bad pixels in image sensing according to an embodiment of the present invention. This embodiment can be applied to various image sensors, such as complementary metal oxide semiconductor (CMOS) image sensors. In this embodiment, the sensed image value of each pixel is obtained through a Bayer pattern color filter array. If there are bad pixels detected (referred to as "bad pixels"), the bad pixels can be further corrected or compensated. After the corrected pixel value of the dead pixel is output, it can be stored, displayed or processed for further image processing.

[0035] In step 21, the difference between the value of the pixel to be detected and the pixel value of the neighboring position is checked, wherein the pixel of the neighboring position and the pixel to be detected can be of different colors. In this embodiment, if the pixel to be detected is taken as the center, it and the adjacent pixel will form a 3x3...

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Abstract

The invention discloses a detection method of image sensing of a bad pixel. Differences between a pixel value to be detected and a plurality of adjacent pixel values are inspected. The continuity of the pixel value to be detected and a plurality of adjacent same color pixel values in a specific direction is inspected. According to the specific direction, the smoothness of the pixel value to be detected in the specific direction is inspected.

Description

Technical field [0001] The present invention relates to image processing, in particular to a method for detecting bad pixels in image sensing. Background technique [0002] Each pixel of a color image can be represented by a vector containing three color components, for example, using the light intensity of the red, green, and blue bands in the visible spectrum. In order to reduce the size and cost, in general image sensors, only one light filter unit is used for each pixel to capture a single chromatic value. Then, other color values ​​are obtained by interpolation based on the neighboring pixel values ​​of the same color. [0003] figure 1 A photosensor array 10 of an image sensor is shown, and a color filter array (CFA) 12 is covered thereon. Each color filter (CF) of the color filter array 12 allows only one color of light to be sensed by the corresponding photosensitive element. Since the special mosaic pattern arrangement of the color filter array 12 is not a complete imag...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00H04N5/357
Inventor 蔡易霖彭源智
Owner HIMAX IMAGING LIMITED