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Method for extracting target from video image

A video image and target technology, which is applied in the field of target extraction in video images, can solve the problems of being easily affected by light and low detection accuracy, and achieve the effect of fast and effective light influence and elimination of light influence

Active Publication Date: 2012-01-18
CHENGDU JIAYITONG INFORMATION TECH CO LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for extracting targets in video images to improve the accuracy of target detection in view of the problems that the target detection methods in the prior art are easily affected by light and have low detection accuracy

Method used

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  • Method for extracting target from video image
  • Method for extracting target from video image
  • Method for extracting target from video image

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Embodiment

[0046] The object detection method of the present invention will be described below by taking the background image and the current image collected by the surveillance camera as the previous frame image and the current frame image respectively. The background image here is the background image of the fixed area.

[0047] The first step is to collect the background image and the current image.

[0048] In the second step, the Harris corner detection method is used to detect the corners of the background image and the current image respectively.

[0049] The third step is to use the background subtraction method for the difference operation between the background image and the current image, and obtain the foreground area according to the difference between the background image and the current image.

[0050] The fourth step is to count the number of corner points: the number of corner points where the previous frame image and the current frame image match in the foreground area...

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Abstract

The invention relates to a method for extracting a target from a video image, and discloses a method for extracting the target from the video image capable of improving the accuracy of the target detection aiming at the problems that the target detection method in the prior art is easily influenced by illumination and the detection accuracy is low. The technical scheme of the invention is that: the method for extracting the target from the video image comprises the following steps: a, acquiring a previous frame image and a current frame image; b, detecting the angular points of the previous frame image and the current frame image; c, acquiring a foreground area according to the difference between the previous frame image and the current frame image; d, counting the number of the angular points of the previous frame image and the current frame image in the foreground area and counting the number of position-matched angular points of the previous frame image and the current frame image in the foreground area; and e, judging whether a target is present in the foreground area according to a relationship between the number of the angular points counted by the step d and set parameters.The method for extracting the target from the video image is particularly suitable for detecting a target in a fixed area under the condition of illumination influence.

Description

technical field [0001] The invention relates to video image processing technology, in particular to a method for extracting objects in video images. Background technique [0002] The extraction of objects in video images (or called foreground extraction, foreground detection) is a common technology in the fields of computer vision, video surveillance, object tracking and so on. The background subtraction method is the most commonly used method. This method uses the difference between the current frame image imgC and the background image (or the previous frame image) imgB: F=imgC-imgB to obtain the foreground image F, thereby determining the foreground area. [0003] However, changes in illumination will cause foreground extraction errors, so eliminating the impact of illumination is of great significance for foreground extraction. [0004] In order to eliminate the influence of illumination on target extraction, many algorithms have been proposed. "Video Segmentation Based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/20
Inventor 补建罗安周聪俊白云胡入幻杨云
Owner CHENGDU JIAYITONG INFORMATION TECH CO LTD
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