Image data compression device and encoder

Details Image data compression device and encoder Image data compression device and encoder

2008-05-06

2008-05-06

Tran, Phuoc (Department: 2624)

Image analysis

Image compression or coding

Adaptive coding

C382S251000, C382S250000

Reexamination Certificate

active

07369708

ABSTRACT:
An image data compression device including: a quantization section which quantizes image data; a FIFO buffer section which buffers quantized data for N frames (N is an integer greater than one) from the quantization section; an encoded data generation section which reads the quantized data from the FIFO buffer section asynchronously from writing into the FIFO buffer section, and generates encoded data; and a rate control section which changes a quantization step of the quantization section by using the data size of the encoded data. The rate control section calculates a quantization parameter to be equal to or less than an upper threshold of the quantization parameter or to be equal to or greater than a lower threshold of the quantization parameter by using an average data size of the encoded data for preceding N frames.

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