MOVING IMAGE CODING DEVICE, MOVING IMAGE CODING METHOD AND PROGRAM THEREOF EMPLOYING PRE-ANALYSIS

A method of making coding images with a two-pass encode or a pre-analysis, wherein the control quantity is suitably given to a buffer. An image coding device makes compresses and codes moving images, and has a pre-analyzing unit, which exist in a constant interval, for making a coding for the images that were input to observe characteristics of each image. Based on the observed characteristics, a unit estimates the complexity degrees of the images and based on the estimated complexity degrees, allocates a code quantity to the images in a constant interval to compute a target code quantity of each image. The device calculates a transition of occupancy in a buffer in assigning the computed target code quantity to each of the images to regulate the target code quantity so that the buffer does not give rise to an overflow or an underflow.