Image encoding apparatus and method for controlling the same and non-transitory computer-readable storage medium

Abstract

This invention provides an apparatus comprising an acquisition unit which acquires information representing optical compression ratios in a horizontal direction and in a vertical direction at a time of image capturing by an image capturing unit; a transform unit which wavelet transforms the image data to generate a plurality of sub-band data; a determination unit which determines quantization parameters for transform coefficients in a plurality of sub-bands obtained by the transform unit; and an encoding unit which quantizes the transform coefficients in the sub-band data obtained by the transform unit in accordance with the quantization parameters determined by the determination unit and to encode the quantized transform coefficients, wherein the determination unit performs weighting for each sub-band based on the information representing the compression ratios acquired by the acquisition unit to determine the quantization parameters.