CN1545324A - Traffic information collection device based on wavelet transformation compression - Google Patents
Traffic information collection device based on wavelet transformation compression Download PDFInfo
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- CN1545324A CN1545324A CNA2003101089457A CN200310108945A CN1545324A CN 1545324 A CN1545324 A CN 1545324A CN A2003101089457 A CNA2003101089457 A CN A2003101089457A CN 200310108945 A CN200310108945 A CN 200310108945A CN 1545324 A CN1545324 A CN 1545324A
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Abstract
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.
Description
Technical field
The present invention relates to a kind of traffic information collecting apparatus based on the wavelet transformation compression.
Background technology
At present, existing traffic information collection equipment has many defectives or weak point to the processing of video data: the traffic information collection equipment that has does not carry out data compression to the video traffic data, the data volume of Cai Jiing is big like this, and access arrangement is required height, is difficult to accomplish real-time echo; The traffic information collection equipment that has compresses the video traffic data and is based on discrete cosine transform (DCT), such as MPEG, H.261 wait.Dct transform is divided into sub-piece with image and carries out conversion, therefore has blocking artifact and mosquito noise.Wavelet transformation is as a kind of reliable time-frequency localization analytical method, with traditional conversion ratio, have lot of advantages: filtering performance is good, eliminates unnecessary noise and interference, improves signal to noise ratio etc.Because wavelet transformation is that entire image is carried out conversion, can effectively overcome the shortcoming of traditional cosine transform coding, realize the compressions of differentiating easily more.Compression ratio can reach 4: 1 (virtually lossless compression)～350: 1, can obtain reasonable subjective assessment effect.Higher compression ratio has been alleviated the pressure of memory device to a certain extent; Simultaneously, the image resolution ratio of preserving after the wavelet compression can reach 720 * 288, and the CIFF form that adopts than traditional traffic information collection equipment has bigger advantage.
Summary of the invention
The purpose of this invention is to provide a kind of traffic information collecting apparatus based on the wavelet transformation compression.
Video camera joins with the Network Transmission mould after joining with traffic video data compressing module, traffic video processing module respectively, and traffic video data compressing module and traffic video processing module are joined.
Advantage of the present invention:
1) the traffic information collection equipment based on wavelet transformation compression compresses the video traffic data, and the compression ratio height can be alleviated the pressure of memory device, can carry out real-time echo to video;
2) the traffic information collection equipment that compresses based on wavelet transformation can effectively overcome the shortcoming of conventional compression;
3) based on the traffic information collection equipment of wavelet transformation compression video traffic data compression, coding are gone up special chip by card and finished simultaneously;
4) video image of preserving based on the traffic information collection equipment of wavelet transformation compression is realized the compressions of differentiating easily.Compression ratio can reach 4: 1, and (virtually lossless compression)～resolution can reach 720 * 288 in 350: 1.
Description of drawings
Fig. 1 is based on the traffic information collecting apparatus structured flowchart of wavelet transformation compression;
Fig. 2 is a traffic video data compressing module structured flowchart of the present invention;
Fig. 3 is wavelet compression of the present invention/encode processor structured flowchart.
Embodiment
Traffic information collecting apparatus based on the wavelet transformation compression has video camera, video camera joins with the Network Transmission mould after joining with traffic video data compressing module, traffic video processing module respectively, and traffic video data compressing module and traffic video processing module are joined.
The traffic video data compressing module: front-end A/D modular converter joins with wavelet compression/encode processor, back-end processor successively, and memory joins with wavelet compression/encode processor, back-end processor respectively.
Wavelet compression/encode processor: digital video I/O interface extracts interpolating module, adaptive quantizing and entropy coding module with high definition control module, wavelet filtering respectively, HCI joins, the sheet internal inner ring joins with wavelet filtering extraction interpolating module, DRAM manager, DRAM successively, and HCI joins with high definition control module, adaptive quantizing and entropy coding module respectively.
Whole system is made up of three big modules, and the wavelet compression module is a nucleus module in the whole system three big modules.This module is the collection laggard capable digitized processing of front end video traffic data through video camera, and the digital signal after the processing is carried out wavelet compression conversion and coding.Wavelet compression and coding are realized by special chip on the sheet.
The basic functional principle of this special chip is as follows: accept video flowing from its digital video I/O interface, through wavelet transformation and frame extraction, coefficient quantization, Run-Length Coding, the Huffman coding produces the data flow of compression and delivers to host interface or fifo buffer output, and Fig. 3 is inner composition frame chart.These modules are divided interface module and digital signal processing module, it is respectively digital video I/O interface, HCI, dram controller, the high definition control module, wavelet filtering extracts interpolating module, the sheet internal inner ring, adaptive quantizing and entropy coding module, wherein the high definition control module is to adopt small reduction ratio that compression ratio is then strengthened in the background area user's interest parts of images, and quantified controlling is in order to satisfy the different network bandwidths, different service quality and the parameter of the change encoding rate set, be real-time sub-band coding statistics to be carried out in the field by the high-speed dsp chip, calculate the corresponding quantization step-length, carry out again that entropy coding reaches.
The present invention utilizes wavelet transformation compressed video traffic data, has promptly alleviated the pressure of memory, has solved the shortcoming in the conventional compression method again, can and be coded in a special chip with the video traffic data compression simultaneously and realize, does not take processor resource.
Claims (3)
1, a kind of traffic information collecting apparatus based on the wavelet transformation compression, it is characterized in that joining with the Network Transmission mould after video camera joins with traffic video data compressing module, traffic video processing module respectively, traffic video data compressing module and traffic video processing module are joined.
2, a kind of traffic information collecting apparatus according to claim 1 based on the wavelet transformation compression, it is characterized in that said traffic video data compressing module: front-end A/D modular converter joins with wavelet compression/encode processor, back-end processor successively, and memory joins with wavelet compression/encode processor, back-end processor respectively.
3, a kind of traffic information collecting apparatus according to claim 1 based on the wavelet transformation compression, it is characterized in that said wavelet compression encode processor: digital video I/O interface extracts interpolating module, adaptive quantizing and entropy coding module with high definition control module, wavelet filtering respectively, HCI joins, the sheet internal inner ring joins with wavelet filtering extraction interpolating module, DRAM manager, DRAM successively, and HCI joins with high definition control module, adaptive quantizing and entropy coding module respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101089457A CN1545324A (en) | 2003-11-25 | 2003-11-25 | Traffic information collection device based on wavelet transformation compression |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2003101089457A CN1545324A (en) | 2003-11-25 | 2003-11-25 | Traffic information collection device based on wavelet transformation compression |
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| CN1545324A true CN1545324A (en) | 2004-11-10 |
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| CNA2003101089457A Pending CN1545324A (en) | 2003-11-25 | 2003-11-25 | Traffic information collection device based on wavelet transformation compression |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545599B (en) * | 2009-04-23 | 2011-11-16 | 深圳万润科技股份有限公司 | Street lamp and monitoring device |
| CN104200684A (en) * | 2014-09-16 | 2014-12-10 | 安徽达尔智能控制系统有限公司 | City main road green wave selection system based on wavelet transformation |
-
2003
- 2003-11-25 CN CNA2003101089457A patent/CN1545324A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545599B (en) * | 2009-04-23 | 2011-11-16 | 深圳万润科技股份有限公司 | Street lamp and monitoring device |
| CN104200684A (en) * | 2014-09-16 | 2014-12-10 | 安徽达尔智能控制系统有限公司 | City main road green wave selection system based on wavelet transformation |
| CN104200684B (en) * | 2014-09-16 | 2016-03-09 | 安徽达尔智能控制系统有限公司 | A kind of major urban arterial highway filtering selective system based on wavelet transformation |
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