IMAGE ENCODING DEVICE AND METHOD AND COMPUTER READABLE RECORDING MEDIUM RECORDING PROGRAM FOR IMAGE ENCODING CONTROL

摘要

PROBLEM TO BE SOLVED: To prevent the degradation of image quality in a part where the complication of images is extremely higher than the periphery while providing a mechanism for making a quantization characteristic value for each block fluctuate corresponding to the complication of the image for each block inside a screen. SOLUTION: An activity calculation part 41 calculates activity which is a parameter for indicating the complication of the images for each macroblock arid an LPF control part 46 executes an LPF arithmetic operation using the value of the activity in the surrounding macroblocks to the activity in the macroblock under consideration only in the case that the activity in the macroblock under consideration is larger than the activity of the macroblocks on the periphery. A quantization index decision part 42 decides a quantization index based on the activity after the LPF arithmetic operation.