Title:
IMAGE ENCODING DEVICE, CONTROL METHOD THEREOF, AND PROGRAM
Document Type and Number:
Japanese Patent JP2023070055
Kind Code:
A
Abstract:
To generate encoded data that is suitable for an image in which compression ratios in both of optically horizontal and vertical directions are different.SOLUTION: An image encoding device comprises: a DWT transformation unit that performs wavelet transformation of image data and generates a plurality of pieces of sub-band data; a determination unit that determines a quantization parameter for transformation coefficients in a plurality of sub-bands obtained by the DWT transformation unit; and an encoding unit that performs quantizing and encoding of the transformation coefficients in the sub-band data obtained by the DWT transformation unit, following the quantization parameter determined by the determination unit. Here, the determination unit determines such that a quantization parameter which is applied to a LH sub-band having the same decomposition level is smaller than a quantization parameter which is applied to a HL sub-band in a case where for example a compression ratio between an optically horizontal and vertical directions indicates a compression ratio in which an image in a horizontal direction is α (α<1) times relative to a vertical direction in the image obtained by an imaging unit.SELECTED DRAWING: Figure 1
Inventors:
MURATA TAKASHI
MOCHIZUKI SHIGEKI
MOCHIZUKI SHIGEKI
Application Number:
JP2022134421A
Publication Date:
May 18, 2023
Filing Date:
August 25, 2022
Export Citation:
Assignee:
CANON KK
International Classes:
H04N19/136; H04N19/126; H04N19/162; H04N19/169; H04N19/63
Attorney, Agent or Firm:
Patent Attorney Corporation Otsuka International Patent Office
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