YCoCg颜色空间及屏幕内容编码 不知大家是否有接触过YCoCg颜色空间,它其实是对RGB颜色空间的无损转换,其中Cg是色度绿色Chroma green缩写,Co是色度橙色Chroma orange缩写。从压缩的角度来看,一个好的颜色空间它的各个分量之间应该是尽量不相关的,显然RGB颜色空间离这个目标有点远。 2003年5月H.264的JVT-H031提案中,由...
我发现不同的Iphone硬件编码器有不同的矩阵用于将输入的RGB转换为YUV.That,在函数OSStatus VTCompressionSessionEncodeFrame(VTCompressionSessionRefCFDictionaryRef frameProperties,void *sourceFrameRefcon,VTEncodeInfoFlags *infoFlagsOut);imageBuffer格式是RGB.Before编码,VideoToolB 浏览59提问于2020-10-20得票数 0 ...
Malvar, H.; Sullivan, G.: YCoCg-R: A color space with RGB reversibil- ity and low dynamic range. ISO/IEC JTC1/SC29/WG11 and ITU-T SG16 Q.6, Document JVT-I014, 2003Malvar, H. and Sullivan, G., "YCoCg-R: A Color Space with RGB Reversibility and Low Dynamic Range," Joint ...
used for YCoCg relative to the precision used for source RGB data. In this proposal, we additionally present a variation of this color space, which we call YCoCg-R. The YCoCg color space has been applied to JPEG XR image compression and to texture compression through the Y...
基本配色分类配色色系表 RGB色彩对照表 配色宝典 热度: YCoCg: AColorSpace withRGBReversibility (FRExt) 1 st Feb2006 H.264hasfourprofiles: •Baseline(IPVideophone,Simplestreaming) •MainProfile(DigitalStorageMedia,TelevisionBroadcasting) •ExtendedProfile(Streamingvideo) ...
这次会议不但提出了YCoCg色彩空间的基本算法表达,同时讨论了YCoCg色彩空间到RGB 色彩空间的转化原理以及逆运算。 YCoCg色彩空间变换的定义为:的改动了YCoCg变换引子,即YCoCg变换中矩阵可以表示为4个数学表达式的形式才能得到色彩分量。同样,在逆变换,我们会分裂4次得到最后结果。产生的颜色数据需要两个以上的精度才能完全...
此外,从RGB到YCoCg的转换非常简单,只需要增加整数和移位。 在将RGB_数据转换为CoCg_Y后,可以通过使用DXT5格式实现彩色图像的高质量压缩。换句话说,亮度(Y)被存储在α通道中,色度(CoCg)被存储在5:6:5颜色通道中的前两个中。对于彩色图像,这种技术产生4:1的压缩比,质量非常好 - 通常优于4:2:0 JPEG在最...
The motivations for choosing the YCoCg-R color space lies in the fact that its transformation from the traditional RGB color space is reversible, with higher transform coding gain and near to optimal compression performance than the RGB and other reversible color spaces, resulting in considerably ...
This paper describes an extended implementation of the H.264/AVC YCoCg-R to RGB color space transformation on the GPU. Both the color space transformation and recombination of the color samples from a nontrivial data layout are performed by the GPU. Using mid- to high-range GPUs, this ...