Patent ID: 6016162
Filing Date: 2000-01-18
Classification: H04N

Abstract:
A video coding apparatus, comprising:local decoding means which outputs local decoded picture signals;memory means for storing local decoded picture signals used as reference picture signals;prediction signal producing means for producing a prediction picture signal based on the reference picture signals;coding means for coding an input picture signal corresponding to a picture used for obtaining the reference picture signals or a picture not used for obtaining the reference picture signals, using the prediction picture signal to obtain a coded prediction error signal;quantization means for quantizing the coded prediction error signal to obtain a quantized prediction error signal; andvariable length coding means for variable-length coding the quantized prediction error signal; andwherein said local decoding means local-decodes the quantized prediction error signal with the prediction picture signal to produce the local decoded picture signal; andsaid quantization means quantizes the prediction error signal, which corresponds to each of the local decoded picture signals used as the reference picture signals, with a smaller quantization step size than the prediction error signal corresponding to the picture not used for obtaining the reference picture signals.