Patent ID: 8571334

Claim:
An image compression device comprising: a high-frequency integrator circuit that acquires a first integrated value by integrating a high-frequency component of first image data; a corrector circuit that handles second image data, which is obtained by subjecting the first image data to an image process affecting frequency characteristics, and acquires a second integrated value by correcting the first integrated value acquired from the high-frequency integrator circuit in accordance with a change in the frequency characteristics; a quantization scale calculator circuit that inputs the second image data, determines, in accordance with the second integrated value acquired from the corrector circuit, the number of bytes resulting when the second image data is compressed, and calculates, in accordance with the determined number of bytes, a quantization scale for compressing the second image data to a predefined number of bytes at once; and a compression executer circuit that compresses the second image data by using the quantization scale calculated by the quantization scale calculator circuit.