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Detection method, correction method and device of digital image dead pixels

A digital image and detection method technology, applied in image communication, solid image signal generator, image signal generator, etc., can solve problems such as poor accuracy of bad pixels, wrong electrical signals, bad pixels of sampled images, etc.

Active Publication Date: 2019-05-10
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0005] In the above image acquisition process, the image sensor often generates wrong electrical signals due to various reasons, resulting in dead pixels in the obtained sampled image, which affects the quality of the final digital image
[0006] At present, when detecting a bad point in a digital image, the difference between the pixel value of the pixel point and the pixel value of the pixel point in the surrounding area of ​​the pixel point is usually used to judge whether the pixel point is a bad point point, and the false detection rate is relatively low. High, the accuracy of dead point detection is poor

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  • Detection method, correction method and device of digital image dead pixels
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  • Detection method, correction method and device of digital image dead pixels

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[0065] At present, in the process of image acquisition, the image sensor may fail to sense the colored light due to defects in the manufacturing process, thereby generating wrong electrical signals, or it may be caused by long-term use or under different lighting conditions. The data it collects is not accurate enough, which ultimately reflects that there are often many bad pixels in the image, which seriously affects the quality of the image.

[0066] In view of the above problems, the embodiment of the present invention provides a method for detecting bad pixels in a digital image. The method obtains a data sub-block centered on a pre-detection pixel, and calculates the average red-green color difference sum of the data sub-block The average blue-green color difference, and then use the average color difference to compensate the heterochromatic pixels in the 3×3 area centered on the pre-detection pixel, so that it can be determined whether the pre-detection pixel is a dead pi...

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Abstract

A detection method, correction method and device for digital image dead pixels. The detection method includes: obtaining a data sub-block centered on the pre-detection pixel; calculating the average color difference between the red R component and the green G component in the data sub-block, and using the pre-detection Performing corresponding color compensation for pixels of different colors in the central 3×3 area to obtain missing color components at the pixels of different colors, wherein the estimated color components have the same color as the pre-detected pixels; based on the The color-compensated data sub-block is used to determine whether the pre-detection pixel is a bad pixel. Applying the detection method to detect the dead point of the digital image has lower false detection rate and higher detection accuracy.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to a detection method, a correction method and a device for digital image bad pixels. Background technique [0002] Digital image processing (Digital Image Processing), that is, the methods and technologies for removing noise, enhancing, restoring, segmenting, and extracting features from images collected by image sensors through computers, has been widely used in digital cameras and other fields. [0003] Currently, in the process of digital image processing, an image sensor is used to collect images first to obtain corresponding sampled images, and then image restoration is performed on the sampled images to obtain corresponding full-color images, that is, final digital images. [0004] Among them, the image sensors used to collect images are mainly divided into two types: charge coupled device (Charge Coupled Device, CCD), and complementary metal oxide active pix...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/367H04N9/04
CPCH04N25/68H04N23/10
Inventor 张玉光熊伟华朱洪波凌晨
Owner SPREADTRUM COMM (SHANGHAI) CO LTD