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    IMAGE RE-ENCODING METHOD AND DEVICE THEREOF
    3.
    发明公开
    IMAGE RE-ENCODING METHOD AND DEVICE THEREOF 审中-公开

    公开(公告)号：EP3209020A4

    公开(公告)日：2017-10-11

    申请号：EP15857097

    申请日：2015-05-21

    申请人： SAMSUNG ELECTRONICS CO LTD

    发明人： CHOI DAI-WOONG ,  CHOI WOONG-IL ,  KIM DONG-WOO ,  LEE A-RANG ,  LEE JONG-SEOK

    IPC分类号： H04N19/40 ,  H04N19/124 ,  H04N19/172

    CPC分类号： H04N19/124 ,  H04N19/172 ,  H04N19/40

    摘要： Provided is a method of determining whether an image is to be re-encoded, the method including obtaining a first quantization matrix from an image file including the image, the image being encoded by quantization based on the first quantization matrix including a plurality of first quantization parameters; obtaining a second quantization matrix from a re-encoding device, the second quantization matrix including a plurality of second quantization parameters and having the same size as the first quantization matrix; determining a comparison coefficient based on elements greater than '0' among elements of a comparison matrix obtained by subtracting the first quantization matrix from the second quantization matrix; and determining that the image is to be decoded by inverse quantization based on the first quantization matrix and the decoded image is to be re-encoded by quantization based on the second quantization matrix, when the comparison coefficient is greater than a first threshold value.