Patent ID: 7421135
Filing Date: 2008-09-02
Classification: H04N

Abstract:
1. An image data compression device that compresses image data, the image data compression device comprising: a quantization section that quantizes image data in unit of a frame; a FIFO buffer sections, quantized data for at least N frames (N is an integer larger than one) quantized by the quantization section being buffered in the FIFO buffer section; an encoded data generation section that reads the quantized data from the FIFO buffer section asynchronously from writing into the FIFO buffer section, the encoded data generation section generating encoded data by encoding the quantized data; and a rate control section that changes a data size of encoded data to be processed by changing a quantization step of the quantization section by using the data size of the encoded data, the rate control section obtaining an average data size by averaging the data sizes of the encoded data for N frames before a frame of the image data quantized by the quantization section, and the rate control section changing the quantization step based on the average data size.