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Stripe interference detection method and device for video image

A video image, interference detection technology, applied in image enhancement, image analysis, image data processing, etc. Effect

Pending Publication Date: 2021-11-02
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for detecting streak interference in video images, so as to at least solve the technical problem of low detection rate in the detection of streak interference in video images in the related art

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  • Stripe interference detection method and device for video image
  • Stripe interference detection method and device for video image

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Embodiment 1

[0040] figure 1 is a flow chart of an optional method for detecting streak interference of a video image according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0041] Step S102, performing scaling processing on the video image to obtain a scaled image.

[0042] Step S104, performing quantization processing on the scaled image, and determining projection variances of the quantized images in different directions respectively.

[0043] Step S106, based on the quantized image, determine pixel parallel line angle information.

[0044] Step S108, based on the pixel parallel line angle information, count the number of straight lines in the video image.

[0045] Step S110, based on the projection variance and the number of straight lines, determine the fringe interference detection result of the video image.

[0046] Through the above steps, the video image can be zoomed to obtain the zoomed image, and then the zo...

Embodiment 2

[0082] In the embodiment of the present invention, the number of straight lines detected in the video image is used to evaluate the degree of fringe interference, and a series of post-processing operations are combined to reduce false positives. The video image can be a grayscale image, a gradient image, or a frame difference image etc., the choice can be made according to the specific situation. In this embodiment, in order to solve the impact of the step effect of the discrete digital image on the straight line detection, Gaussian downsampling is performed on the video image, and then the gradient direction and intensity are counted pixel by pixel. After obtaining the gradient information of each pixel, for each pixel Assign a unit vector perpendicular to the gradient direction, record this unit vector as a parallel line, and use this as a basis for straight line segment detection.

[0083] Figure 4 is a flow chart of another optional video image stripe interference detect...

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Abstract

The invention discloses a stripe interference detection method and device for a video image. The detection method comprises the following steps: carrying out scaling processing on a video image to obtain a scaled image, then carrying out quantization processing on the scaled image, respectively determining projection variances of the quantized image in different directions, then determining pixel parallel line angle information based on the quantized image, counting the number of straight lines in the video image based on the pixel parallel line angle information, and finally determining a stripe interference detection result of the video image based on the projection variance and the number of straight lines. The technical problem that the detection rate is low when stripe interference of a video image is detected in the prior art is solved.

Description

technical field [0001] The present invention relates to the technical field of video image processing, in particular to a video image stripe interference detection method and device thereof. Background technique [0002] With the large-scale rise of smart and safe city construction, a large amount of video surveillance data has been accumulated, and the amount of data is still increasing every day. At present, because video surveillance systems often have the characteristics of large deployment and long working hours, the monitoring Video is susceptible to streaking. At the same time, there are great differences in the types of stripe interference, (for example, the common ones are horizontal stripes, column stripes, oblique stripes, thick stripes, thin stripes and periodic stripes), and their causes are often different (for example, power frequency interference, internal voltage difference, etc.) balance, current imbalance, transmission, image sensor deviation, system nois...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/41
CPCG06T7/0002G06T7/41G06T2207/10016
Inventor 李远沐熊剑平
Owner ZHEJIANG DAHUA TECH CO LTD