Traffic information collection device based on wavelet transformation compression
A technology of traffic information collection and wavelet transformation, which is applied in image communication, digital video signal modification, television, etc., can solve the problems of high requirements for access equipment, large data volume, and no data compression for video traffic data, etc. It is much easier to achieve Distinguishing compression, overcoming traditional compression, stress-relieving effects
Inactive Publication Date: 2004-11-10
ZHEJIANG UNIV
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Problems solved by technology
[0002] At present, the existing traffic information collection equipment has many defects or deficiencies in the processing of video data: some traffic information collection equipment does not compress the video traffic data, so the amount of collected data is large, and the requirements for access equipment are high , it is difficult to achieve real-time echo; some traffic information collection equipment compresses video traffic data based on discrete cosine transform (DCT), such as MPEG, H.261, etc.
The DCT transform divides the image into sub-blocks for transformation, so there are square effects and mosquito noise
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[0013] The traffic information acquisition device based on wavelet transform compression has a camera, the camera is respectively connected with the traffic video data compression module and the traffic video processing module, and then connected with the network transmission module, and the traffic video data compression module is connected with the traffic video processing module.
[0014] Traffic video data compression module: the front-end A / D conversion module is connected with the wavelet compression / encoding processor and the back-end processor in turn, and the memory is respectively connected with the wavelet compression / encoding processor and the back-end processor.
[0015] Wavelet compression / encoding processor: the digital video I / O interface is respectively connected with the high-definition control module, wavelet filter extraction and interpolation module, adaptive quantization and entropy encoding module, and host control interface, and the on-chip buffer is sequ...
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The invention discloses a wavelet transformation compression based traffic information collecting device. A camera is connected with traffic video data compressing module and traffic video processing module respectively and then with network transmission module, and the traffic video data compressing module is connected with the traffic video processing module. Its advantages: 1), it compresses traffic video data, where if compression ratio is high, it can relieve burden on storage devices and make real-time video return display; 2), it can overcome the disadvantages of traditional compressions; 3) it completes compression and coding of traffic video data at the same time by special chips on a card; 4), its stored video images are easy to implement resolved compression. The compression ratio can reach 4 to 1 (visual lossless compression)-350 to 1 and the resolution can reach 720x288. íííí
Description
technical field [0001] The invention relates to a traffic information collection device based on wavelet transform compression. Background technique [0002] At present, the existing traffic information collection equipment has many defects or deficiencies in the processing of video data: some traffic information collection equipment does not compress the video traffic data, so the amount of collected data is large, and the requirements for access equipment are high , it is difficult to achieve real-time echo; some traffic information collection equipment compresses video traffic data based on discrete cosine transform (DCT), such as MPEG, H.261, etc. The DCT transform divides the image into sub-blocks for transformation, so there are square effects and mosquito noise. As a reliable time-frequency localization analysis method, wavelet transform has many advantages compared with traditional transform: good filtering performance, elimination of redun...
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Inventor 刘济林项小峰李培弘
Owner ZHEJIANG UNIV