Patent ID: 7308147
Filing Date: 2007-12-11
Classification: H04N

Abstract:
1. An image processing apparatus comprising: an image compression unit performing a discrete wavelet transform of pixel values for each of one or a plurality of rectangular portions to produce wavelet coefficients, the rectangular portions being produced by dividing each of a number of frames of a motion picture, and the image compression unit performing a hierarchical compression coding of the wavelet coefficients for each rectangular portion so that a codestream is produced; a syntax analysis unit analyzing header information of the codestream outputted from the image compression unit; a memory unit storing the codestream according to a result of the analysis of the syntax analysis unit; a decoding unit decoding the codestream outputted from the memory unit; a comparison unit determining a similarity of wavelet coefficients between a current frame and a preceding frame by comparison of the wavelet coefficients between the current frame and the preceding frame; and a codestream generating unit reducing an amount of code data of a corresponding rectangular portion of the current frame based on the similarity determined by the comparison unit.