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A Robust Detection Method for Dead Pixels in Starry Sky Images

A detection method and image technology, applied in image communication, TV, color TV components and other directions, can solve problems such as large limitations, and achieve the effect of less parameters, easy adjustment, and clear statistical significance

Active Publication Date: 2015-12-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the existing image dead point detection method with large limitations, the present invention provides a starry sky image dead point robust detection method

Method used

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  • A Robust Detection Method for Dead Pixels in Starry Sky Images
  • A Robust Detection Method for Dead Pixels in Starry Sky Images
  • A Robust Detection Method for Dead Pixels in Starry Sky Images

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Embodiment Construction

[0036] The specific steps of the starry sky image dead point robust detection method of the present invention are as follows:

[0037] 1. Estimation of the background noise level of starry sky images.

[0038] First in the multi-frame image sequence S I ={I 1 , I 2 ,...,I t ,... I T} randomly select a frame of image I R As a reference image, where t=1,...,T, T represents the number of image frames in the sequence, I t Represents any frame of image, the image height is h, and the image width is w. For this single frame reference star image I R , use the threshold to binarize the starry sky image, that is, according to whether the pixel value is greater than the threshold ε bw And for segmentation, the image I t The gray value of the pixel at (i,j) in the middle is And there are 1≤i≤h, 1≤j≤w, the pixel gray value in the image satisfies The pixels of are divided into star spot areas, and satisfy The pixels are segmented into the background area. Segmentation thres...

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Abstract

The invention discloses a star sky image defective pixel robustness detection method used for solving the technical problem that an existing image defective pixel detection method is much limited. According to the technical scheme, characteristics of a star sky image and characteristics of defective pixels in image pixel statistic are fully considered, interference of exterior points in samples to statistic estimation is eliminated by means of stability of star sky image local area statistic, median statistic, mean absolute deviation statistic and other robustness statistic, pixels at the positions of the exterior points are taken as statistic exterior points of local pixels, the statistic method based on a statistic exterior point detection concept is designed, each position is judged by means of sufficient samples in continuous sequence images and accordingly the exterior points in the images are detected. According to the method, the number of parameters is small, statistical significance is clear, the method can be easily adjusted according to specific application, and the method is suitable for detection of the points defective in different degrees.

Description

technical field [0001] The invention relates to an image dead point detection method, in particular to a starry sky image dead point robust detection method. Background technique [0002] Dead pixels in the image are usually caused by damage to the camera's imaging components, which appear as pixels that are not sensitive to the input signal and have higher or lower response than the average response. The detection of dead pixels is of great significance for imaging system status assessment and image processing. [0003] Existing image detection methods mainly rely on images exposed by imaging devices under specific conditions. [0004] The document "Chinese Invention Patent whose Authorization Announcement No. is CN101715050B" discloses a method for detecting dead pixels in an image. This method proposes to use an image sensor to obtain a zero-exposure image in a dark environment or to obtain a uniform exposure image by imaging a monochrome plate of different colors under...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00H04N5/367
Inventor 张艳宁巩东李海森孙瑾秋丁王斌韩超
Owner NORTHWESTERN POLYTECHNICAL UNIV