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    • 6. 发明申请
    • HARMONIC QUANTIZER SCALE
    • 谐波量规
    • US20120224627A1
    • 2012-09-06
    • US13468643
    • 2012-05-10
    • Sridhar Srinivasan
    • Sridhar Srinivasan
    • H04N7/30
    • H04N19/124H04N19/126H04N19/136H04N19/176H04N19/46H04N19/61
    • A digital media encoder/decoder performs quantization/dequantization based on quantization parameters taken from a harmonic quantizer scale. The harmonic quantizer scale can include a normal portion consisting of quantization parameter values harmonically-related as simple fractions of each other, and a denormal portion of quantizers having a linear or other relation. The encoder/decoder further supports a scaled quantizer mode where quantization is performed based on the quantization parameter as scaled by a fractional value. A compressed domain contrast adjustment is effected by adjusting the quantization parameters in the compressed bitstream, without having to adjust and recode the digital media data in the compressed bitstream.
    • 数字媒体编码器/解码器基于从谐波量化器尺度获得的量化参数来执行量化/去量化。 谐波量化器标度可以包括由作为彼此的简单分数彼此谐波相关的量化参数值组成的正常部分,以及具有线性或其他关系的量化器的非正常部分。 编码器/解码器还支持缩放的量化器模式,其中基于由分数值缩放的量化参数来执行量化。 通过调整压缩比特流中的量化参数来实现压缩域对比度调整,而不必对压缩比特流中的数字媒体数据进行调整和重新编码。
    • 8. 发明授权
    • Prediction of transform coefficients for image compression
    • 图像压缩变换系数的预测
    • US07933337B2
    • 2011-04-26
    • US11203009
    • 2005-08-12
    • Sridhar SrinivasanChengjie Tu
    • Sridhar SrinivasanChengjie Tu
    • H04N7/12H04N11/02H04N11/04
    • H04N19/48H04N19/105H04N19/122H04N19/136H04N19/18H04N19/186H04N19/593H04N19/60
    • A block transform-based digital media codec uses a transform coefficient prediction that takes into account a dominant directionality of the digital media data (e.g., an image with strong horizontal or vertical features), and further operates compatibly with a two-stage transform. For DC and DCAC coefficients from an inner stage transform of a macroblock, the codec calculates and compares directionality metrics based on inner stage transform DC coefficients of neighboring macroblocks to determine dominant directionality. For DCAC coefficients from an outer stage transform of blocks within the macroblock, the codec calculates and compares directionality metrics based on the inner stage transform DCAC coefficients of the macroblock to detect dominant directionality. The determination of directional dominance can also take into account information from other channels (e.g., chrominance as well as luminance).
    • 基于块变换的数字媒体编解码器使用考虑了数字媒体数据(例如,具有强的水平或垂直特征的图像)的主要方向性的变换系数预测,并且进一步与两阶段变换兼容地运行。 对于来自宏块的内部级变换的DC和DCAC系数,编解码器基于相邻宏块的内部级变换DC系数计算并比较方向性度量,以确定主要方向性。 对于来自宏块内的块的外级变换的DCAC系数,编解码器基于宏块的内部级变换DCAC系数来计算并比较方向性度量,以检测主导方向性。 方向优势的确定还可以考虑来自其他信道的信息(例如,色度以及亮度)。