IMAGE DECODING APPARATUS

An image decoding device is provided to enhance subjective picture quality of users by changing a variation of quantization coefficients of each region of an image such that the variation in a luminance component is smaller than that in a color component when coding the image by dividing it into reg...

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Bibliographic Details
Main Authors SEO, YANG SEOCK, CHO, DAE SUNG
Format Patent
LanguageEnglish
Published 22.09.2008
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:An image decoding device is provided to enhance subjective picture quality of users by changing a variation of quantization coefficients of each region of an image such that the variation in a luminance component is smaller than that in a color component when coding the image by dividing it into regions. An entropy decoding unit(109) entropy-decodes a bit stream. A dequantization unit(111) determines the first quantization coefficient of macroblocks included in the first region by using quantization information and supplementary quantization information of a magnetic region included in a single header among the entropy-decoded information, dequantizes the macroblocks included in the first region by using the determined first quantization coefficient, obtains the second quantization coefficient of macroblocks included in the second region through the quantization information of the magnetic region, and dequantizes the macroblocks included in the second region by using the second quantization coefficient. An image restoring unit(112) de-converts the dequantized macroblocks to decode an image.
Bibliography:Application Number: KR20080078507