Method and device for dead pixel detection and correction of image sensor

Abstract

The invention discloses a method and a device for dead pixel detection and correction of an image sensor. The device comprises an image sensor data input unit, a gain compensation unit, a dead pixel judgment unit, a dead pixel deletion strength control unit, a dead pixel correction unit and a dead pixel deletion data output unit. The method comprises the steps of regarding data generated by various arrangements of four filter lenses with the period of 2*2 as input data, establishing an M*N data window by regarding each point of the input data as a center and performing gain calculation and gain compensation; judging a dead pixel condition in each direction of each point of the input data to obtain dead pixel information; providing a variance/brightness model and determining a dead pixel deletion strength based on texture information of each point; and correcting the dead pixel by utilizing the dead pixel information and the dead pixel deletion strength and outputting corrected data. According to the method and a device for dead pixel detection and correction of the image sensor, dead pixel detection and correction of the data format of the image sensor of various arrangement modes of four filter lenses with the period of 2*2 are satisfied, and dead pixel detection and correction can be carried out automatically and efficiently.

Description

technical field [0001] The invention relates to the field of video image processing, in particular to a method and device for detecting and correcting dead pixels of an image sensor. Background technique [0002] Due to differences in semiconductor manufacturing processes and raw materials, image sensors will have some dead pixels, which are mainly divided into two types: one is fixed dead pixels with pixels that are always bright or dark; the other is pixels that change over time The variance is larger than the surrounding pixels. [0003] At present, there are two types of methods for detecting and correcting dead pixels of image sensors commonly used: one is to count the dead pixels of the image sensor offline. Changes with changes in temperature and time; the other is to detect and correct bad points on the image sensor in real time. [0004] There are currently four main types of image sensors based on the 2x2 filter arrangement on the market, such as Figure 1a-1d Sh...

AI Technical Summary

Problems solved by technology

At present, there is no method for detecting and correcting dead pixels applicable to various arrangements of the four filters with a minimum sampling period of 2x2. Dead pixel detection and correction in permutation-based image sensor data formats

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