def rgb2ycbcr(im): cbcr = np.empty_like(im) r = im[:,:,0] g = im[:,:,1] b = im[:,:,2] # Y cbcr[:,:,0] = .299 * r + .587 * g + .114 * b # Cb cbcr[:,:,1] = 128 - .169 * r - .331 * g + .5 * b # Cr cbcr[:,:,2] = 128 + .5 * r -...
B = Y + (443(Cb - 128))>>8 To use look-up table, we can change to following format: RGB => YCbCr: We adjust a little of the factors to avoid saturation operation to improve performance Y = (77R + 150G + 29B)>>8 Cb = (128B – 43R – 85G)>>8 + 128 = (32768 + 12...
因为YCbC422格式图像采用4:2:2采样,即每2个像素块,采样2次Y,1次Cb和Cr。 函数接口声明如下: 对像素阶数据的操作: HmppResult HMPPI_YCbCr422ToRGB_8u_C2C3R(const uint8_t *src, int32_t srcStep, uint8_t *dst, int32_t dstStep, HmppiSize roiSize); HmppResult HMPPI_YCbCr422ToRGB_8u...
提出一种无乘法器并可配置精度的YCbCr到RGB高性能视频解码电路。该电路采用加法和移位计算代替浮点乘法运算,以减少电路面积;电路内部采用流水线结构提高数据转换频率;根据功耗、面积、转换精度等不同的应用要求,可配置内部加法器和流水线寄存器位宽实现各种电路需求;支持YUV111,YUV421,YUV411等压缩图像格式转化。根据FPGA实...
The Y-component is first level shifted up by 128 so that it falls in the [0.0, 255.0] range. The three YCbCr components are then transformed to the RGB color space by using the following transform matrix.Figure 15: The YCbCr to RGB conversion matrix...
Convert the YCbCr image back to RGB color space. RGB2 = ycbcr2rgb(YCBCR); Display the luminance channel of the image in YCbCr color space alongside the image that was converted from YCbCr to RGB color space. figure subplot(1,2,1) imshow(YCBCR(:,:,1)) title('Original Luminance (Y)'...
前面已经讲到由单片CCD彩色摄像机得到Bayer Raw Data(Bayer格式视频数据),并且通过插值算法得到RGB数据;或者通过三片式CCD彩色摄像机直接得到RGB数据。同时我们也常听到YUV或者YCbCr视频数据,这些不同的概念直接有什么关系呢,今天就关于这个话题做详细介绍。首先,这里
i need convert RGB image to YCbCr colour space, but have some colour shift problems, i used all formulas and got the same result. Formula in python cbcr[0] = int(0.299*rgb[0] + 0.587*rgb[1] + 0.114*rgb[2]) #Y cbcr[1] = int(-0.1687*rgb[0] - 0.3313*rgb[1] + 0.5*rgb[2]...
我在opencore网站找到了Color Converter IP Core代码,但是这个代码太复杂(有很多可调参数),很像altera VIP IP核中的CSC;另外我还找到了Xilinx的两个版本的RGB2YCbCr的VHDL代码,一个是Color-Space Converter: RGB to YCrCb,XAPP930,这个代码包还有对应的说明文档,这些都能在Xilinx官网上下载到;另一个是在国内某...
Convert image data represented by luma, blue-difference, and red-difference channels to red, green, and blue channels.