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Scene change real-time detecting method based on compression field

A technology of scene change and real-time detection, applied in the field of image processing, to achieve the effect of simple algorithm, high efficiency, and reduction of environmental light changes

Inactive Publication Date: 2009-06-10
ZHEJIANG UNIV
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Problems solved by technology

[0006] It can be seen that the above-mentioned existing scene change detection technologies and methods try to improve the reliability of scene changes in image sequences, but there are deficiencies, and there is room for innovation and improvement in detection algorithms and judgment mechanisms to improve detection efficiency

Method used

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  • Scene change real-time detecting method based on compression field
  • Scene change real-time detecting method based on compression field

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Embodiment Construction

[0049] Since discrete cosine transform (Discrete cosine transform, DCT) has good decorrelation and fast algorithm, it is widely adopted by international compression standards such as JPEG, MPEG1 / MPEG2 / MPEG4, H261 / H263 / H264, etc. Due to the universality of the JPEG basic mode encoding and decoding algorithm, almost all other international standards mentioned above adopt an algorithm structure similar to it. Therefore, the embodiment of the present invention chooses the image processing based on JPEG encoding and decoding, which is typical.

[0050] figure 1 The image codec algorithm in JPEG basic mode is given. In the JPEG encoding algorithm, the original image is first divided into 8×8 non-overlapping sub-blocks, and then DCT is performed on each sub-block to obtain 1 DC coefficient (DC coefficient) and 63 AC coefficients (AC coefficients), and then all these The coefficients are reordered according to zig-zag, and finally the DC coefficients are encoded using Differential p...

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Abstract

A method for carrying out real time detection on scene variation based on compressed domain includes setting region to be detected, picking up character directly from symbol stream be entropy-decoded, carrying out united mobile detection on character variation of conversion domain coefficient at positions corresponding to current image and background reference image as well as variation recording image, judging whether there is scene variation or not according to detection result then simultaneously and dynamically updating background reference image and variation recoding image.

Description

technical field [0001] The invention relates to image processing technology, in particular to a method for real-time detection of scene changes based on compressed domain. Especially in the compressed domain, fast real-time detection of scene changes in image sequences, while providing reliable scene change indications to wireless digital image monitoring systems. Background technique [0002] With the application and development of wireless technology, industrial site images of massive information need to be stored in embedded terminal devices and transmitted to the monitoring center in real time for full-time personnel to manually monitor and complete the judgment of abnormal situations in the scene. Due to the complexity of on-site working conditions, for some important scenes, full-time personnel are required to stare at the monitor intently, which is prone to fatigue and distraction. Therefore, there is an urgent need to develop embedded terminal devices with certain i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/14H04N7/36H04N19/142
Inventor 苏宏业佘青山古勇董利达王建新
Owner ZHEJIANG UNIV
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