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METHOD AND SYSTEM FOR DETECTING INTRA-CODED PICTURES AND FOR EXTRACTING INTRA DCT PRECISION AND MACROBLOCK-LEVEL CODING PARAMETER S FROM UNCOMPRESSED DIGITAL VIDEO
METHOD AND SYSTEM FOR DETECTING INTRA-CODED PICTURES AND FOR EXTRACTING INTRA DCT PRECISION AND MACROBLOCK-LEVEL CODING PARAMETER S FROM UNCOMPRESSED DIGITAL VIDEO
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机译:用于从未压缩的数字视频中检测帧内编码图像以及提取帧内DCT精度和宏块级编码参数S的方法和系统
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摘要
The present invention relates to a method and system for extracting coding parameters from uncoded video data. Encoded video data is decoded using an MPEG decoder to produce decompressed video data. A DC computation operation is performed to recover an intra-dc-precision level from the decompressed video data, such that if the intra-dc-precision level is less than a first predetermined threshold, the decompressed video data is classified as an intra-coded picture. If the intra-dc-precision level is equal to the first predetermined threshold, a discrete cosine transform (DCT) is performed to produce a set of DCT coefficients for at least one AC frequency band in the decompressed video data. Then, an average quantizer step size is computed based on the AC data and if the average quantizer step size is greater than a second predetermined threshold, the decompressed video data being processed is classified as an intra-coded picture. Thereafter, the quantization matrix data of a frame of the decompressed video data is extracted. In addition, a quantizer scale and a DCT type value for each block of the decompressed video data is extracted.
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