Image encoding apparatus, image decoding apparatus, and control methods therefor
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United States of America Patent
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May 28, 2019
Grant Date -
Jan 18, 2018
app pub date -
Jul 10, 2017
filing date -
Jul 12, 2016
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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.
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