Patent ID: 6650707
Filing Date: 2003-11-18
Classification: H04N

Abstract:
A method for transcoding coded digital video signals representing blocks of pixels, comprising the steps of:decoding inputted encoded digital signals, including the steps of determining an end-of-block (EOB) position in an incoming block of the encoded inputted signal, inverse quantizing the inputted signals, determining a discrete cosine transform (DCT) block type based on the EOB position, and performing partial inverse DCT computations based on the DCT block type to provide decoded signals; and encoding the decoded signals, including the steps of determining if an incoming block of the decoded signals is intracoded or intercoded, performing a DCT of the decoded signals by selecting, if the incoming block is intracoded, DCT coefficients from the inverse quantized inputted signals to provide transformed signals, and performing a DCT of the decoded signal by computing, if the incoming block is intercoded, selected DCT coefficients located before the EOB position of the incoming block to provide transformed signals.