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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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STV0974TR 데이터시트(PDF) 13 Page - STMicroelectronics |
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STV0974TR 데이터시트(HTML) 13 Page - STMicroelectronics |
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13 / 69 page  Functional description STV0974 13/61 4.4 Video compression (VC) Real time video compression permits a frame rate of 30 frame/s in any mode at VGA. The JPEG compression engine is a standard baseline sequential JPEG encoder [2]. The compression ratio can be modified by applying a multiplication factor on the quantization table. The quantization table can be scaled from a factor of 1/8 to a factor of 8. The STV0974 video compression block includes a baseline DCT JPEG encoder compliant with ISO DIS 10918-1. The JPEG encoder has the following characteristics: ● baseline sequential DCT based encoder ● YUV 422 encoding only ● up to VGA image size ● scalable quantization table ● standard quantization table ● standard Huffman coder The encoder top level block diagram is presented in Figure 3. The input data is a YUV 422 8-bit data stream in raster order. The output data is a baseline JPEG data stream. Figure 3: Encoder top level block diagram Raster to block converter Discrete Cosine transform ZigZag transform Entropy coder Quantize |
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