Patent ID: 6415055
Filing Date: 2002-07-02
Classification: H04N

Abstract:
A moving image decoding method for decoding a coded moving image signal, said coded moving image signal having been formed from a moving image signal, the method comprising:a first step of receiving coding information including said coded moving image signal and a predictive coding mode indicating a type of motion compensation to be used in decoding said coded moving image signal; a second step of generating an inverse quantized signal by inverse quantizing said coded moving image signal and generating a residual signal by performing an inverse orthogonal transform on said inverse quantized signal; a third step of generating a predictive picture signal by applying motion compensation to a reference picture signal in accordance with said predictive coding mode; a fourth step of adding said residual signal to said predictive picture signal to generate a reproduced image signal; a fifth step of detecting an error within a block of said coded moving image signal, said block being positioned within an error frame of said coded moving image signal, and said error being based on a calculation performed in the decoding system; and a sixth step of stopping decoding of said block when an error is detected at said fifth step; wherein said predictive coding mode is selected based upon the values of a first inter picture distance indicating a nominal distance between said coded moving image signal and a past reference picture signal which temporally precedes said coded moving image signal, and a second inter picture distance indicating a nominal distance between said coded moving image signal and a future reference picture signal which temporally follows said coded moving image signal.