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    • 87. 发明授权
    • Method of coding an arbitrary shape of an object when all pixels of an
entire region of a display are used as texture for the object
    • 当将显示器的整个区域的所有像素用作对象的纹理时,编码对象的任意形状的方法
    • US6151413A
    • 2000-11-21
    • US63373
    • 1998-04-21
    • Euee-seon Jang
    • Euee-seon Jang
    • H04N7/24G06T9/20H03M7/30H04N19/00H04N19/102H04N19/105H04N19/134H04N19/139H04N19/17H04N19/176H04N19/20H04N19/21H04N19/25H04N19/46H04N19/51H04N19/70G06K9/36G06K9/48
    • G06T9/20H04N19/20
    • A method of coding an object of an arbitrary shape. The arbitrary shape coding method includes the steps of: (a) determining whether or not a shape in a video object layer (VOL) is an arbitrary shape; (b) calculating the size of a video object plane (VOP) in each frame if the shape in the VOL is determined as being an arbitrary shape in the step (a); (c) coding information of each frame about whether or not all macroblocks in the VOP are opaque; (d) coding the VOP in macroblock units if the shape of each frame is determined not to be all opaque in the step (c); and (e) coding only motion and texture information in the VOP, by macroblock, if the shape in the VOL is determined to be a non-arbitrary shape in the step (a) or if the shape in the VOP in a frame is determined as all opaque in step (c). Therefore, when all pixels of the entire display region are used as the texture of the object, the coding of the arbitrary shape can be achieved by coding only 1-bit information per VOP, without the need for transmission of the shape information requiring 1.about.3 bits per macroblock. Also, the number of modules required for the coding based on a macroblock is reduced from 4 to 2, thereby reducing the amount of calculation for encoding.
    • 编码任意形状的对象的方法。 任意形状编码方法包括以下步骤:(a)确定视频对象层(VOL)中的形状是否为任意形状; (b)如果在步骤(a)中将VOL中的形状确定为任意形状,则计算每个帧中的视频对象平面(VOP)的大小; (c)每帧的编码信息是否是VOP中的所有宏块都不透明; (d)如果在步骤(c)中每个帧的形状被确定为不全都不透明,则以宏块为单位对VOP进行编码; 如果在步骤(a)中将VOL中的形状确定为非任意形状,或者如果帧中的VOP中的形状被确定,则(e)仅按宏块编码VOP中的运动和纹理信息 如步骤(c)中所有不透明的。 因此,当整个显示区域的所有像素被用作对象的纹理时,可以通过仅对每个VOP编码1位信息来实现任意形状的编码,而不需要传输需要1个差分的形状信息 每个宏块3位。 此外,基于宏块的编码所需的模块数量从4减少到2,从而减少编码的计算量。
    • 88. 发明授权
    • Digital-watermark superposing apparatus and digital-watermarker
detecting apparatus
    • 数字水印叠加装置和数字水印检测装置
    • US6111990A
    • 2000-08-29
    • US152294
    • 1998-09-14
    • Kazumi SugayaTakeshi NakamuraYoshiaki Moriyama
    • Kazumi SugayaTakeshi NakamuraYoshiaki Moriyama
    • H04N5/91G06F21/10G06T1/00G09C5/00G11B20/10H04L9/36H04N1/387H04N7/08H04N7/081H04N19/124H04N19/154H04N19/25H04N19/46H04N19/467H04N19/583H04N19/60H04N19/625H04N19/70G06K9/36G06K9/46
    • G06T1/0028H04N19/60G06T2201/0052
    • In a digital-watermark superposing apparatus and a digital-watermark detecting apparatus, a plurality of DCT coefficients for respective frequency components are generated by subjecting video data to a two-dimensional DCT transform for each pixel block consisting of a predetermined number of pixels, and the value of at least one of the DCT coefficients is quantized in accordance with a quantization rule corresponding to the information so as to obtain a quantized DCT coefficient. A two-dimensional inverse DCT transform is performed with respect to the DCT coefficients in which the at least one DCT coefficient thereof is replaced with the quantized DCT coefficient, so as to obtain digital-watermark superposed video data in which the digital watermark corresponding to the information has been superposed on the video data. At this juncture, the digital-watermark superposed video data is selected and outputted concerning a section in which a video pattern due to the video data is not flatter than a predetermined video pattern, while, instead of the digital-watermark superposed video data, the video data is selected and outputted as it is concerning a section in which the video pattern due to the video data is flatter than the predetermined video pattern.
    • 在数字水印重叠装置和数字水印检测装置中,通过使视频数据对于由预定数量的像素构成的每个像素块进行二维DCT变换来生成用于各个频率分量的多个DCT系数,以及 根据对应于该信息的量化规则量化DCT系数中的至少一个的值,以获得量化的DCT系数。 对于其中至少一个DCT系数被替换为DCT系数的DCT系数执行二维逆DCT变换,以获得数字水印叠加的视频数据,其中对应于 信息已经叠加在视频数据上。 此时,数字水印叠加视频数据被选择并输出,其中由于视频数据而导致的视频图像不比预定的视频图形更平坦,而代替数字水印叠加的视频数据, 选择和输出视频数据,其中由于视频数据导致的视频图像比预定的视频图形更平坦的部分。