US 12,069,306 B2
Image encoding apparatus and method for controlling the same and non-transitory computer-readable storage medium
Takafumi Murata, Tokyo (JP); and Shigeki Mochizuki, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Oct. 27, 2022, as Appl. No. 17/974,611.
Claims priority of application No. 2021-180509 (JP), filed on Nov. 4, 2021; and application No. 2022-134421 (JP), filed on Aug. 25, 2022.
Prior Publication US 2023/0133895 A1, May 4, 2023
Int. Cl. H04N 19/63 (2014.01); G06T 3/4015 (2024.01); H04N 19/12 (2014.01); H04N 19/136 (2014.01); H04N 19/18 (2014.01); H04N 19/196 (2014.01)
CPC H04N 19/63 (2014.11) [G06T 3/4015 (2013.01); H04N 19/12 (2014.11); H04N 19/136 (2014.11); H04N 19/18 (2014.11); H04N 19/196 (2014.11)] 20 Claims
OG exemplary drawing
 
1. An image encoding apparatus operable to encode image data obtained by an image capturing unit, the apparatus comprising:
an acquisition unit configured to acquire information representing optical compression ratios in a horizontal direction and in a vertical direction at a time of image capturing;
a transform unit configured to wavelet transform the image data to generate a plurality of sub-band data;
a determination unit configured to determine quantization parameters for transform coefficients in a plurality of sub-bands obtained by the transform unit; and
an encoding unit configured to quantize 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 is operable to perform weighting for each sub-band based on the information representing the compression ratios acquired by the acquisition unit to determine the quantization parameters.