The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 2019
Filed:
Jul. 10, 2017
Canon Kabushiki Kaisha, Tokyo, JP;
Yushi Kaneko, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention provides a technique of efficiently encoding image data while especially suppressing a decrease in resolution caused by a difference in illuminance. An encoding apparatus includes a transforming unit which performs discrete wavelet transform for image data to be encoded up to preset decomposition level n (n≥2) to generate a plurality of sub-bands, a quantizing unit which quantizes coefficient data in the sub-bands of the respective decomposition levels, and an encoding unit which encodes the coefficient data. The quantizing unit quantizes each sub-band of decomposition level n based on a quantization parameter set for each sub-band, and quantizes each sub-band of decomposition level n−1 or less based on a quantization parameter set for each sub-band and a weighting coefficient dependent on coefficient data of a sub-band LL of decomposition level n.