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Defect pixel detection and correction device and method based on texture recognition

A defect pixel and correction device technology, applied in the field of image processing, can solve the problem of image modulation transfer function reduction, etc., and achieve the effect of good image details

Active Publication Date: 2021-02-26
思特威(上海)电子科技股份有限公司
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Problems solved by technology

If the threshold value of defective pixel correction is too small, some pixels within the reasonable edge range will also be regarded as defective pixels and corrected to a relatively smooth filter value, which will reduce the entire image modulation transfer function

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  • Defect pixel detection and correction device and method based on texture recognition
  • Defect pixel detection and correction device and method based on texture recognition

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Embodiment Construction

[0032] The contents of the present invention will be described in detail below in conjunction with the accompanying drawings. figure 1 It is the basic block diagram of the defect pixel detection and correction device based on texture recognition, as shown in the figure:

[0033] The defect pixel detection and correction device 100 based on texture recognition includes an image sensor data input unit 110, which inputs the image data output by the image sensor device; Each pixel of the input image data counts the color difference in the m×n data window, such as in the 5×11 data window, takes the median value of the color difference to obtain the color difference value of the current pixel, and subtracts the color difference value, Perform chromatic aberration compensation; the defective pixel detection unit 130 is connected to the chromatic aberration compensation unit 120, and calculates the total variation of N pixels around the current pixel. During the calculation of the tot...

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Abstract

The present invention provides a defect pixel detection and correction device based on texture recognition, the device includes an image sensor data input unit for inputting image data of the image sensor; a color difference compensation unit connected to the image sensor data input unit, for all Each pixel of the image data counts the color difference in the m×n data window, takes the median value of the color difference, obtains the color difference value of the current pixel point, subtracts the color difference value, and performs color difference compensation; the defective pixel detection unit , calculating the total variation of N pixels around the current pixel, including pixels of the same channel or not of the same channel, determining the texture intensity of the current pixel according to the calculation results, and detecting defective pixels; the defective pixel correction unit uses The defective pixel is corrected according to the detection result of the defective pixel detection unit. The invention also provides a method for detecting and correcting defective pixels based on texture recognition.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a device and implementation method for detecting and correcting defective pixels based on texture recognition. Background technique [0002] During the manufacture or operation of the image sensor device, some defective pixels may not be able to accurately sense the light level, so there will be some dead pixels in the output. There are two cases of these dead pixels, fixed dead pixels that are too bright or too dark, and one is that the variance of the temporal change is larger than that of the surrounding pixels. To correct or remove these dead pixels, it is necessary to perform defect pixel correction. In general, the way to correct a defective pixel is to estimate a correct value for a specific defective pixel based on its adjacent pixels, and then compare the estimated value with the initial value. If the difference is greater than the set threshold, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/367H04N5/217
CPCH04N23/81H04N25/68
Inventor 汪小勇谢晓邵科任冠京马伟剑莫要武徐辰
Owner 思特威(上海)电子科技股份有限公司
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