Patent ID: 6678322
Filing Date: 2004-01-13
Classification: H04N

Abstract:
A video data coding device for coding input video data supplied thereto, the device comprising:target quantity of codes calculation means for calculating a target quantity of codes to be distributed to the input video data on the basis of parameter data representing characteristics of the input video data; delay means for delaying the input video data by a predetermined time period; and coding processing means, for carrying out coding processing in accordance with the target quantity of codes with respect to the input video data delayed by the delay means; wherein, the target quantity of codes calculation means finds a coding difficulty indicating the difficulty at the time of coding from the parameter data, and calculates the target quantity of codes to be distributed to the video data on the basis of the coding difficulty; the coding processing means codes the input video data for each picture coding group including predetermined numbers of intra-pictures, predictive-pictures and bidirectionally predictive-pictures, and the target quantity of codes calculation means precedently reads the coding difficulty for each picture coding group, determines the target quantity of codes for each picture coding group by using the corresponding relation of the target quantity of codes based on the coding difficulty, distributes the target quantity of codes for each picture coding group in accordance with the ratio of coding difficulty for each coded picture, and determines the target quantity of codes for each coded picture.