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 Wysłany: Pią 14:04, 08 Kwi 2011 Temat postu: B -spline wavelet -based video image adaptive comp |
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B -spline wavelet -based video image adaptive compression method of industrial
3013 analog video decoding and image through SAA7111A A / D , serves as CCIR-656 (YCrCb, 4:2:2) uncompressed video format data stream, give it away ADV612 compression , when the ADV612 depth of 512 characters FIFO is full , C6211 EMIF read by the people to SDRAM ; C6211 completion of the current field in the reconstruction of the minimum luminance blocks to complete the dynamic test , the follow-up to determine the location of the frame in the target area ; and synthesize the available bandwidth determined in the follow-up field goal area Size, and to transfer the compressed video stream of field necessary filtering the output buffer after the release . 4 performance of the system because in this system , you can set the appropriate video compression module ADV612 compression ratio of the corresponding register to get complete video stream , so the greatest impact of this system is real-time dynamic estimation and minimum brightness LL5 computational complexity of the decoding block Degrees. The following table shows the algorithm when run on the computational complexity of TMS320C6211B150M Statistics : The statistics in Table 1 the computational complexity in this system, test results can be dynamic compression of video frame rate , such as the frame rate dropped to second An even lower to get the ultimate image compression ADV612 compression ratio 7500:1 . The A / D after the rate 167Mb / s for NTSC digital video signal , for example, the first intra-frame coding using compressed to 250:1 , the dynamic test results according to the frame rate will be reduced to a second , and with the quality of the window The role of the image can be compressed to 25kb / s. 5 Conclusion proven , the adaptive rate control method is simple, real time, can meet the very low bit rate video surveillance images under the transmission industry .
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