Mosaic detection method and mosaic detection device for passive images
A detection method and mosaic technology, applied in image coding, image data processing, instruments, etc., can solve the problems of too much reference information, inconvenient large-scale promotion, complex calculation, etc., and achieve the effect of improving the accuracy
Inactive Publication Date: 2012-07-04
PEKING UNIV +2
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[0008] The present invention provides a passive image mosaic detection method and device, which are used to solve the problem that the image detection method in the prior art is complex in calculation, requires too much reference information, and is not convenient for large-scale promotion
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[0030] An embodiment of the present invention provides a passive image mosaic detection method, the method comprising: performing edge detection on the image to be detected to obtain a binary edge image about the edge of the image to be detected; using rectangular structural elements to expand the binary edge image , making the edge of the binary edge image regular; using multiple square templates to perform template matching on the expanded binary edge image, and superimposing the matching points obtained by matching the multiple square templates with the binary edge image Form a template matching point map in the frame; divide the template matching point map into a plurality of preselected blocks with a set threshold, if the preselected block includes a plurality of matching points then keep one; perform corner detection on the image to be detected to generate Corner point detection map: comparing the obtained template matching point map with the corner point detection map, i...
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The invention discloses a mosaic detection method and a mosaic detection device for passive images, which are applied to the technical field of image detection. The method comprises the following steps of: carrying out edge detection on images to be detected to obtain two-value edge images; carrying out expansion on the two-value edge images by adopting rectangular structure elements; carrying out template matching on the two-value edge images after expansion processing by adopting a plurality of square templates, and overlapping matching points obtained by matching the plurality of square templates and the two-value edge images on one two-value edge image; the two-value edge image formed by overlapping is divided into a plurality of preselection blocks by adopting set thresholds, if the preslection blocks contain a plurality of matching points, one matching point is maintained for forming a template matching point map; carrying out angular-point detection on the images to be detected, wherein if angular points exist in the area coverage of one preselection block, the preselection block is set as the mosaic. For the mosaic detection method and the mosaic detection device provided by the utility model, angular-point detection and template matching are carried out simultaneously, so that the accuracy degree in detecting the mosaic distortion area is improved.
Description
technical field [0001] The invention relates to the technical field of image detection, in particular to a passive image mosaic detection method and device. Background technique [0002] With the development of computer technology, image recognition technology is also widely used in the automatic monitoring of digital TV fault images. Black frames, still frames, and mosaics are common faults in digital TV. In the block-based video coding method, due to errors in the decoding or transmission process, there may be more obvious block effects, which is the so-called "mosaic". The appearance of mosaic reduces the visual quality of the image, so it is necessary to detect it as accurately as possible Whether there is a mosaic in each frame of the video, and the position of the mosaic, to assist in the accurate evaluation of the video quality. The automatic detection of digital TV black field and still frame based on image recognition technology has been widely used and achieved g...
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IPC IPC(8): G06K9/62G06T9/00
Inventor 白蔚刘家瑛郭宗明
Owner PEKING UNIV