Image defective pixel compensation method and device and terminal device

Abstract

The invention provides an image defective pixel compensation method and device and a terminal device.A pre-provided image sensor comprises a photosensitive pixel array and an optical filter arranged on the photosensitive pixel array; the optical filter comprises a filter unit array; and each filter pixel covers m*n photosensitive pixels, thus forming a combined pixel, wherein the m*n is more than 1. The method comprises the following steps of when the output of the photosensitive pixel array is read to form a full size image, detecting whether a currently detected first photosensitive pixel is a defective pixel or not according to a preset strategy; and if it is determined that the first photosensitive pixel is the defective pixel, compensating the output of the defective pixel according to the outputs of the normal pixels in the first combined pixel to which the first photosensitive pixel belongs. The defective pixel on the image sensor can be detected and compensated; and the quality and the definition of the output image can be improved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image dead point compensation method, device and terminal equipment. Background technique [0002] With the development of science and technology and manufacturing process, the pixels of image sensors are increasing day by day, such a large number of pixels will inevitably produce dead pixels in the manufacturing process. The dead point in the sensor refers to the pixel whose value does not change with the illuminance and always presents the same color. The existence of dead pixels will greatly reduce the quality of the image, detecting dead pixels and compensating for them can improve the quality of the image. [0003] At present, the quality of the image sensor is controlled according to the number of dead pixels. If the number of dead pixels exceeds the preset threshold, the product cannot be shipped; at the same time, another control parameter for dead pi...

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Problems solved by technology

[0003] At present, the quality of the image sensor is controlled according to the number of dead pixels. If the number of dead pixels exceeds the preset threshold, the product cannot be shipped; at the same time, another control parameter for dead pixels is that the number of dead pixels in any unit area cannot Exceeding the threshold, such a control range is to prevent the bad pixels from being too concentrated, which will cause a certain area of ​​the image to be completely black or completely white and cannot be recognized

But even with this control, there are always dead pixels in the factory image sensor

The existence of dead pixels will greatly reduce the quality of the image

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