Patent ID: 9083952
Filing Date: 2015-07-14
Classification: H04N

Abstract:
1. A method for compressing a video stream, the method comprising: receiving a differentially encoded video stream comprising standard encoded video frames, wherein at least a portion of the standard encoded video frames are standard encoded I-frames; determining that a plurality of standard encoded I-frames are reference I frames; decoding the standard encoded I-frames using variable length decoding (VLD) to obtain Discrete Cosine Transform (DCT) coefficients of the I-frames after quantization; losslessly compressing at least a portion of the standard encoded I-frames that are not reference I-frames, based on differences between the DCT coefficients of the portion of the I-frames and the DCT coefficients of the reference I-frames, to obtain losslessly-compressed encoded I-frames; and replacing the standard encoded I-frames in the video stream with the corresponding losslessly-compressed encoded I-frames to obtain a compressed encoded video stream.