Information processing device, moving image coding method, and recording medium on which computer program for moving image coding is recorded

A moving image coding method comprising:

• calculating, by a computer, for each of first blocks which are obtained by dividing a coding target picture included in moving image data, a ratio of an area of respective corrected blocks which is obtained by correcting distortion of a subject represented in the respective first blocks to an area of the respective first blocks;
• generating code amount control information to control a code amount of each of the respective first blocks such that the higher the ratio for the respective first blocks and the higher a data amount of the corrected block, the larger a code amount which is assigned to the respective first blocks;
• dividing the coding target picture into second blocks,
• generating a prediction block for each of the second blocks,
• calculating a prediction error signal between the respective second blocks and the corresponding prediction block,
• calculating a orthogonal transform coefficient for each of the second blocks by performing an orthogonal transform of the corresponding prediction error signal,
• quantizing the orthogonal transform coefficient by a quantization scale in accordance with the code amount control information of the respective first blocks including the respective second blocks, and
• generating a coded data stream by entropy-coding the orthogonal transform coefficient which is quantized for each of the second blocks.

A non-transitory computer-readable recording medium recording a moving image coding program which causes a computer to perform a process, the process comprising:

• calculating for each of first blocks which are obtained by dividing a coding target picture included in moving image data, a ratio of an area of a corrected block obtained by correcting distortion of a subject represented in the first block to an area of the first block;
• generating code amount control information to control a code amount of each of the respective first blocks such that the higher the ratio for the respective first blocks and the higher a data amount of the corrected block, the larger a code amount which is assigned to the respective first blocks;
• dividing the coding target picture into second blocks,
• generating a prediction block for each of the second blocks,
• calculating a prediction error signal between the respective second blocks and the corresponding prediction block,
• calculating a orthogonal transform coefficient for each of the second blocks by performing an orthogonal transform of the corresponding prediction error signal,
• quantizing the orthogonal transform coefficient by a quantization scale in accordance with the code amount control information of the respective first blocks including the respective second blocks, and
• generating a coded data stream by entropy-coding the orthogonal transform coefficient which is quantized for each of the second blocks.