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    • 1. 发明申请
    • METHOD FOR LOCALLY ADJUSTING A QUANTIZATION STEP
    • 用于本地调整量化步骤的方法
    • WO2006106032A1
    • 2006-10-12
    • PCT/EP2006/060804
    • 2006-03-16
    • THOMSON LICENSINGHUGUENEL, LilaTHOREAU, DominiqueGUILLOTEL, Philippe
    • HUGUENEL, LilaTHOREAU, DominiqueGUILLOTEL, Philippe
    • H04N7/30
    • H04N19/192H04N19/124H04N19/152H04N19/154H04N19/17H04N19/179H04N19/60
    • The invention relates to a method of locally adjusting a quantization step for each region of an image in a sequence of n images. The method comprises the following steps: calculating, for each image of the sequence, a first difference of bits saved on the potential masking region when quantizing it with a first quantization step and a second difference of bits required by the region of interest when quantizing it with a second quantization step; and in each image of the sequence, assigning to the potential masking region the first quantization step and if the sum of the n first differences of bits (GPOT) is higher than the sum of the n second differences of bits (DROI), assigning said second quantization step to said region of interest and otherwise assigning a third quantization step such that the sum of said n first differences of bits is distributed between the regions of interest according to a reconstruction quality criterion.
    • 本发明涉及一种以n个图像序列为单位的图像的每个区域局部调整量化步长的方法。 该方法包括以下步骤:对于序列的每个图像,当量化它时,以第一量化步长和感兴趣区域所需的位的第二差值计算在潜在掩蔽区域上保存的位的第一差值, 用第二量化步骤; 并且在所述序列的每个图像中,将所述第一量化步骤分配给所述潜在屏蔽区域,并且如果所述n个第一差分比特(GPOT)的和高于所述n个第二差分比特的总和(DR0I),则将所述 第二量化步骤到所述感兴趣的区域,否则分配第三量化步骤,使得所述n个第一差分的和根据重构质量标准分布在感兴趣区域之间。
    • 2. 发明申请
    • METHOD FOR LOCALLY ADJUSTING A QUANTIZATION STEP
    • 用于本地调整量化步骤的方法
    • WO2006106030A1
    • 2006-10-12
    • PCT/EP2006/060799
    • 2006-03-16
    • THOMSON LICENSINGHUGUENEL, LilaTHOREAU, DominiqueLE MEUR, Olivier
    • HUGUENEL, LilaTHOREAU, DominiqueLE MEUR, Olivier
    • H04N7/30
    • H04N19/192H04N19/124H04N19/154H04N19/17H04N19/179H04N19/60
    • The invention relates to a method of locally adjusting a quantization step for each region of an image with respect to a setpoint quantization step. The method comprises the steps of: - assigning (20), to said region of interest, a first quantization step (QP_ROI_MINj), lower than or equal to said setpoint quantization step (QP*); - determining (22) a second quantization step (QP-POTj) higher than or equal to said setpoint quantization step (QP*) and lower than or equal to a third quantization step (QP_POT_MAXj) such that the number of bits required by the region of interest is lower than the number of bits saved on the potential masking region; and - assigning (22), when such a second quantization step exists, said second quantization step (QP-POTj) to said potential masking region, otherwise assigning said third quantization step (QP_POT_MAXj) to said potential masking region.
    • 本发明涉及一种相对于设定点量化步骤对图像的每个区域进行局部调整量化步长的方法。 该方法包括以下步骤: - 分配(20)所述感兴趣区域,低于或等于所述设定点量化步长(QP *)的第一量化步骤(QP_ROI_MINj); - 确定(22)高于或等于所述设定点量化步长(QP *)并小于或等于第三量化步长(QP_POT_MAXj)的第二量化步长(QP-POTj),使得所述区域所需的位数 感兴趣的值低于保存在电位掩蔽区域上的位数; 以及 - 当存在所述第二量化步长(22)时,将所述第二量化步骤(QP-POTj)分配给所述电位屏蔽区域,否则将所述第三量化步骤(QP_POT_MAXj)分配给所述电位屏蔽区域。