Patent ID: 8243796
Filing Date: 2012-08-14
Classification: H04N

Abstract:
1. An image data compression apparatus for compressing image data, comprising: a quantization section for quantizing image data as a frame unit; an FIFO buffer section for buffering quantization data of a plurality of frame portions quantized by the quantization section; a rate control section which changes a data size of encoded data by changing a quantization step of the quantization section, wherein: the rate control section obtains a predictive data size of encoded data, which is preceding by one frame, from a data size of quantization data preceding a current frame by the one frame, and changes the quantization step based on the predictive data size, the predictive data size being calculated according to a formula y =Ax −b, where y is the predictive data size, x is the data size of the quantization data preceding the current frame by the one frame, A is a value corresponding to an encoding efficiency of the encoded data generating section, and b is a value corresponding to a data size of header information of the encoded data generated by the encoded data generating section.