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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 inability to effectively distinguish between dead pixels and edges, bad pixels mistaken for edge images, and image sensor defects Problems such as pixels or dead pixels

Active Publication Date: 2012-08-01
HIMAX IMAGING LIMITED
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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 A flowchart showing a method for detecting bad pixels in image sensing according to an embodiment of the present invention. This embodiment is applicable to various image sensors, such as Complementary Metal Oxide Semiconductor (CMOS) image sensors. In this embodiment, the sensing image value of each pixel is obtained through a Bayer pattern color filter array. If there are bad pixels (referred to as "bad pixels") detected, the bad pixels can be further corrected or compensated. After the output of the corrected bad pixel value, it can be stored, displayed or further image processed.

[0035] In step 21 , the difference between the value of the pixel to be detected and the value of the adjacent pixels is checked, wherein the adjacent pixels may belong to different colors from the pixels to be detected. In this embodiment, if the pixel to be detected is used as the center, it will form a 3x3 array with adjacent pixel points, such as Figure 3A The shown blu...

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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 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 with three color components, such as light intensities in the red, green, and blue bands of the visible spectrum. In order to reduce size and cost, in general image sensors, only one optical filter unit is used for each pixel to capture a single chromatic value. Then, other color values ​​are obtained by interpolation according to the adjacent pixel values ​​of the same color. [0003] figure 1 Shown is a photosensor array 10 of an image sensor overlaid with a color filter array (CFA) 12 . Each color filter (CF) of the color filter array 12 can only allow 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 image normally viewed by human...

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Application Information

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