RATE CONTROLLER, RATE CONTROL METHOD AND CODER

摘要

PROBLEM TO BE SOLVED: To provide a rate controller that controls a coding bit rate of moving picture data with less deterioration in the image quality. SOLUTION: The rate controller calculates a quantization scale for coding for each macro block on the basis of an occupied quantity of a virtual buffer simulating a buffer in the inside of a coder coding moving picture data and control a coding bit rate by feeding back the calculated qantization scale to the coder. In this case, a virtual buffer occupied quantity storage section 219 keeps a virtual buffer occupied quantity, a mean quantization scale calculation section 215 calculates an object qantization scale for each coding in the unit of pictures, and a virtual buffer initialization section 218 initializes the virtual buffer occupied quantity of the virtual buffer occupied quantity storage section 219 in response to the object quantization scale.