Defective 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: 2018-12-07
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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  • Defective pixel detection and correction device and method based on texture recognition
  • Defective 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 invention provides a defective pixel detection and correction device based on texture recognition. The device comprises an image sensor data input unit for inputting image data of an image sensor;a chromatic aberration compensation unit connected to the image sensor data input unit, and used for counting the chromatic aberration of each pixel of the image data in an m*n data window, selectinga median value of the chromatic aberration to obtain a chromatic aberration value of the current pixel, subtracting the chromatic aberration value, and performing chromatic aberration compensation; adefective pixel detection unit for calculating a total variation of N pixels around the current pixel, including pixels of the same channel or different channels, determining the texture intensity ofthe current pixel according to the calculation result, and detecting defective pixels; and a defective pixel correction unit for collecting the defective pixels according to the detection result of the defective pixel detection unit. The invention further provides a defective pixel detection and correction method 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 Applications(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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