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公开(公告)号：US11528491B2
公开(公告)日：2022-12-13
申请号：US17266546
申请日：2019-10-23
发明人： Oh Jin Kwon
IPC分类号： H04N19/186 , H04N19/182 , H04N19/60
摘要： Disclosed is image encoding/decoding method using color coordinate axis conversion, comprising the steps of: acquiring pixel distribution information, on first color coordinate system, about an image; determining, on the basis of the pixel distribution information, first component having the widest variance from among the components of the first color coordinate system; acquiring an intermediate color coordinate system by rotating, around a starting point, a coordinate axes of the first color coordinate system so that variance of the first component is maximized; determining a second component having the widest variance from among components excluding the first component in the intermediate color coordinate system; acquiring a second color coordinate system by rotating, around the starting point, a coordinate axis of the intermediate color coordinate system so that variance of the second color component is maximized; and encoding the image on the basis of pixel distribution information on the second color coordinate system.
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公开(公告)号：US20210334931A1
公开(公告)日：2021-10-28
申请号：US17057249
申请日：2019-05-17
发明人： Oh Jin Kwon
IPC分类号： G06T1/00 , G06T9/00 , H04N19/91 , H04N19/174
摘要： The present disclosure provides a method of embedding a watermark on a Joint Photographic Experts Group (JPEG) image. The method includes: performing an entropy decoding on the JPEG image to generate quantized discrete cosine transform (DCT) coefficients; determining target bits in a bit plane of the quantized DCT coefficients on the basis of a watermark-embedding table (WET); and embedding a watermark based on metadata of the JPEG image in the target bits. Also, the present disclosure provides a method of verifying integrity of the image by using the embedded watermark.
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公开(公告)号：US11915336B2
公开(公告)日：2024-02-27
申请号：US17057249
申请日：2019-05-17
发明人： Oh Jin Kwon
IPC分类号： G06T1/00 , G06T9/00 , H04N19/174 , H04N19/91
CPC分类号： G06T1/0057 , G06T1/0092 , G06T9/00 , H04N19/174 , H04N19/91
摘要： The present disclosure provides a method of embedding a watermark on a Joint Photographic Experts Group (JPEG) image. The method includes: performing an entropy decoding on the JPEG image to generate quantized discrete cosine transform (DCT) coefficients; determining target bits in a bit plane of the quantized DCT coefficients on the basis of a watermark-embedding table (WET); and embedding a watermark based on metadata of the JPEG image in the target bits. Also, the present disclosure provides a method of verifying integrity of the image by using the embedded watermark.
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公开(公告)号：US20210295564A1
公开(公告)日：2021-09-23
申请号：US17266562
申请日：2020-02-10
发明人： Oh Jin Kwon
IPC分类号： G06T9/00 , H04N19/103 , H04N19/176
摘要： Disclosed are a progressive image encoding method and a decoding method corresponding thereto. The encoding method comprises the steps of: with respect to an image, acquiring information relating to a central area; selecting an initial block from at least one block included in the central area; determining an encoding path for a plurality of blocks included in the image, according to a center-to-edge sequence from the initial block; and encoding the image on the basis of the encoding path.
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