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An image detection method and device

An image detection and image technology, which is applied in image communication, image signal generator, TV, etc., can solve the problems of large amount of calculation and low detection accuracy of bad image pixels, and improve detection accuracy, signal-to-noise ratio and stability , the effect of reducing the amount of calculation

Inactive Publication Date: 2010-04-21
VIMICRO CORP
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Problems solved by technology

[0008] Embodiments of the present invention provide an image detection method and device to solve the problems of low detection accuracy and large amount of calculation of bad image pixels in the prior art

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  • An image detection method and device
  • An image detection method and device
  • An image detection method and device

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Embodiment Construction

[0028] In the embodiment of the present invention, processing is performed on the original image, and bad pixels are viewed from an overall perspective. First, multiple original images to be detected are collected for superimposition and compensation, and the compensated image is divided into multiple small image blocks. Select at least one small image block that meets the requirements as the reference area in the small image block, calculate the reference value of the pixel gray value according to the reference area, and compare the gray value of each pixel of the compensated image with the gray value Comparing with the benchmark value, the point that meets the condition is considered as normal point, otherwise, it is considered as bad point.

[0029] Among them, when calculating the reference value of the gray value of the pixel, in order to improve the signal-to-noise ratio and stability of the image, generally a plurality of original images to be detected are collected and ...

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Abstract

The present invention provides an image detecting method, including:collecting multiple original images to be detected, overlapping the multiple original images to be detected; dividing the overlapping image into multiple small image blocks, selecting at least small image block meeting condition as reference area from multiple small image blocks; processing image detection according to the reference area. At the same time, the inventin also provides an image detector. The embodiment of the invention detects deads from global view on the basis of the original images, improving precision of image deads detection, reducing calculated amount.

Description

technical field [0001] The invention relates to the technical field of image bad point detection, in particular to an image detection method and device. Background technique [0002] Now the pixel arrangement of the image sensor (Sensor) of general digital products is basically Bayer (Bayer) type, and each point on the Bayer type image has only one color component, such as figure 1 shown. Three color components of red, green, blue (Red, Green, Blue, RGB) can be obtained at each point after color filter array interpolation (Color Filter Array Interpolation, CFA interpolation) or demosaicking (Demosaicking), thus obtaining A displayable color image that is visible to the human eye. [0003] Due to the limitation of the manufacturing process level of the current sensor, there may be dead pixels (Dead Pixel). Among them, dead pixels or defective pixels refer to pixels that do not change with the sensitivity and always present a uniform brightness, manifested as bright or dark...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/04H04N17/00
Inventor 沈操
Owner VIMICRO CORP
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