Opencv planar yuv. For instance: Y 1 Y 2 …Y n U 1 V 1 U 2 V 2 …U n/2 V n/2. Image transfer. Place there Y channel, then U, then V. Difference between color models and color space how RGB565 is different from RGB888 any suggested link YUV vs RGB vs YCbCr. Note: The AR and Video Effects SDKs provide wrapper functions only for RGB images. Feb 2, 2024 · In this article, we will see what is YUV and how to implement the YUV color model on an image using OpenCV. Mar 17, 2020 · I am trying to use OpenCV, version 4. The chroma plane is subsampled by 2 in each direction. The chroma plane is subsampled by 2 in the horizontal direction. Does opencv or other libraries provide I422 (YUV422 Planar) picture format support? Asked 3 years, 6 months ago Modified 3 years, 6 months ago Viewed 836 times YUV is actually the name of the color space that is common to all "YUV" pixel formats. In my project I use OpenH264 codec, which is said to output data in the YUV 4:2:0 planar format. If you need other flags, don't hesitate to have a look at imgproc. hpp which shows all of them. 7. Oct 25, 2025 · OpenCV’s color conversions can feel like alphabet soup—BGR, RGB, HSV, LAB, XYZ, YUV, Bayer patterns… and dozens of packed/planar variants used by cameras and codecs. The chroma sub-sampled formats are planar formats — which means luminance and chrominance information is usually stored in separate planes — in this case a single plane to store the luma Converting packed YUV frames to planar YUV format is expensive for me, since related hardware does not support YUY2-I420 conversion. #include <opencv2/imgproc. I found a very similar question HERE Planar YUV420 and NV12 is the same I am interested to understand conversion of RGB image to YUV420 planar format, specifically in Python. Semi-planar means the components of Y are grouped together, and the components of U and V are interleaved. void cvCvtColor(const CvArr* src, CvArr* dst, int code) Converts an image from one color space to another. In our example, crop,vflip are in one linear chain, split and overlay are separately in another. I am trying to use OpenCV, version 4. I have created a function which takes a YUV image as source and converts it into RGB. YUV422基础原理 1. For instance: Y 1 Y 2 …Y n U 1 U 2 …U n/2 V 1 V 2 …V n/2. The points where the linear chains join are labelled by names enclosed in square brackets. I am a complete novice at this. [16U] means to support CV_16U src type. Planar YUV image frames represent a color image in the YUV color space commonly used for video processing and both video and image compression. Additionally you will notice that in both conversion to //YUV 4:2:0 formats family and //YUV 4:2:2 formats family there are 0's in the mapping from OpenCV colour conversion code to the CUDA implementation. After decoding I get one array with width * height * 1. Operations on sub-rectangles YUV422 YUV420 Planar Semi-Planar详解，代码先锋网，一个为软件开发程序员提供代码片段和技术文章聚合的网站。 I have a buffer which contains an image in YV12 format. Many component types, for example, u8, f32, f16, and so on. Chroma lines contain half the number of pixels and the same number of bytes as luma lines, and the chroma plane contains half the number of lines of the luma plane. 13 You can convert RGB<->YUV in OpenCV with cvtColor using the code CV_YCrCb2RGB for YUV->RGB and CV_RGBYCrCb for RGB->YUV. [8U] means to support CV_8U src type. 1 色彩模型与采样 YUV组成： Y：亮度分量（Luminance），决定像素明暗，全分辨率保留。 U/V：色度分量（Chrominance），描述颜色偏移（U≈蓝差，V≈红差），水平方向降采样。 采样比例： 原始像素 Y分量全保留 UV水平减半 YUV格式解析1（播放器——project2）根据板卡api设计实现yuv420格式的视频播放器打开*. cv::cvtColor( yuv, rgb, COLOR_YUV2RGB_UYVY ); cv::cvtColor( rgb, yuv, COLOR_RGB2YUV ); The Free and Open Source Cross Platform YUV Viewer with an advanced analytics toolset - IENT/YUView 文章浏览阅读1. hpp> the color conversion codes See also Color conversions 2. 2 days ago · Note that the default color format in OpenCV is often referred to as RGB but it is actually BGR (the bytes are reversed). NV16, NV61, NV16M and NV61M ¶ Semi-planar YUV 4:2:2 formats. When I convert BGR to YUV, presumably to the Color_BGR2YUV opencv command, what are the ranges for the values that retur #include <opencv2/imgproc. 文章浏览阅读1w次，点赞5次，收藏43次。本文深入探讨YUV像素格式，包括YUV与RGB的区别，YUV的采样方式及存储格式，如YUV422的UYVY、YUYV，YUV420的NV12、NV21等。同时，提供了从UYVY到YV12的转换代码示例。 在嵌入式系统，或者是用作库的接口时，yuv图像一般都是char的格式，而在进行图像处理的时候我们一般都是使用OpenCV的Mat格式。本文记录的是将YUV420SP（planar YUV 40, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (first byte U and the fo 文章浏览阅读2w次，点赞5次，收藏29次。 前言YUV 格式通常有两大类:打包 (packed)格式和平面 (planar)格式。 前者将 YUV 分量存放在同一个数组中, 通常是几个相邻的像素组成一个宏像素 (macro-pixel);而后者使用三个数组分开存放 YUV 三个分量,就像 是一个三维平面一样。 文章浏览阅读1w次。本文深入解析YUV格式的基本概念及其在视频处理中的应用，包括YUV420sp和YUV420p的区别，并提供了一段旋转90度的YUV420sp数据转换代码。 What are the ways of converting RGB image to YUV image and accessing Y, U and V channels using Python on Linux? (using opencv, skimage, or etc) Update: I used opencv I have a buffer which contains an image in YV12 format. Now I want to either convert this buffer to RGB format or create a Mat object from it directly! Can someone help me? I tried this code : cv 2. The problem is that UYVY format is compressed and I don't find any way to explode data directly into YUV format, whitout passing from BGR. 文章浏览阅读3. 1. 所以当时认为，yuv分量代入转换公式的话，uv分量是不是少了。 Hi everybody, I’am grabbing video with the Blackmagic DeckLink SDK and want to convert the videostream into a cv::Mat type for further processing. So I've heard that the YUV and YPbPr colour system is essentially the same. The steps I plan to follow In my project I use OpenH264 codec, which is said to output data in the YUV 4:2:0 planar format. Tiled NV12 Semi-planar YUV 4:2:0 formats, using macroblock tiling. Converts images between color spaces using OpenCV's Graph API, enabling transformations such as RGB to BGR or YUV. Within video frame object’s public properties I have access to both YCbCr frame payload and individual color space buffers (array of bytes). Because I’am new to programming with OpenCV - what is the best way for doing this? I tried something like this but i’am not sure if this is a valid way? void* data; //void* means pointer to an undefined type inputFrame->GetBytes(&data); if 2. 5 elements, which, when displaying, looks lik YUV格式有两大类：planar和packed。 对于planar的YUV格式，先连续存储所有像素点的Y，紧接着存储所有像素点的U，随后是所有像素点的V。 对于packed的YUV格式，每个像素点的Y,U,V是连续交*存储的。 YUV，分为三个分… 1. So the first byte in a standard (24-bit) color image will be an 8-bit Blue component, the second byte will be Green, and the third byte will be Red. 2. Now I want to either convert this buffer to RGB format or create a Mat object from it directly! Can someone help me? I tried this code : cv This topic describes the 10- and 16-bit YUV formats that are recommended for capturing, processing, and displaying video in the Microsoft Windows operating system. Hi, I’m newie to OpenCV and I’m struggling trying to create BGR Mat objects from YCbCr video frames and showing them using Imshow. If the image is coming from the camera, it can be semi-planar in NV21 form so one plane of Y and then one plane of VU of same width but half the height. This buffer is YUV 4:2:2, using UYVY format. In the example, the split filter generates two outputs that are associated to the This topic describes the 10- and 16-bit YUV formats that are recommended for capturing, processing, and displaying video in the Microsoft Windows operating system. 5. hpp> the color conversion codes See also Color conversions Note The source image (src) must be of an appropriate type for the desired color conversion. Both of these things imply to me that there are no corresponding CUDA implementations to or from YUV 4:2: [0|2]. I want to obtain a workable Mat in YUV, where I can split channels and do every filter I want. 5 elements, which, when displaying, looks lik YUY2 I420 といった単語をよく目にするけど、こいつらって結局どう違うんじゃい！ というのを完全に理解できるようにまとめた そもそも、YUVとは RGBで1pixelを表すと、R, G, B で8bitずつ、計24bit必要だが、 YUVでは 輝度信号(白黒) と #include <opencv2/imgproc. A color is described as a Y′ component (luma) and two chroma components U and V. Composition of one image with another, controlled by a matte. 264类型的文件，实现其播放。使用的视频格式是YUV420格式YUV格式通常有两大类：打包（packed）格式和平面（planar）格式。前者将YUV分量存放在同一个数组中，通常是几个 Packed 的优势当然是在于更节省内存空间。 Planar 的优势： 可以并行访问像素数据。 在内存带宽不足的时候， Planar 就明显优于 Packed 了。 如 YUV，如果采用 Planar，相比于 Packed，可以并行访问Y、U、V三个平面，那就相当于只花1/3的时间，就可以访问到一个YUV像素。. 0 through python to convert a planar YUV 4:2:0 image to RGB and am struggling to understand how to format the array to pass to the cvtColor function. Hey folks, I’m writing an NDK based application and am getting YUV image data fed into a surface which is delivered to my code in an AImage* structure. mp4;*. Contrary to RGB formats (Red-Green-Blue), YUV colors are represented with one "luminance" component called Y (equivalent to grey scale) and two "chrominance" components, called U (blue projection) and V (red projection) respectively, hence the name. ‣ To create an NvCVImage object wrapper for an OpenCV image, use the 一些YUV是planar格式，这意味着所有Y数据在存储器中是连续的，接着是所有U和V数据。 其他一些YUV是packed格式，意味着Y，U和V数据是交错的，如RGB或BGR中的R，G和B数据。 planar格式的示例是I420，其具有12bpp。 After finished decoding and copied data from GPU to CPU, I called opencv function to convert the YUV image to BGR image, but the image looks very abnormal with the whole image looks green and repeated objects on the image. Feb 6, 2026 · Planar means the components of Y, U, and V are respectively grouped together. To facilitate this conversion, FFmpeg provides a range of API functions 采样方式 YUV码流的存储格式其实与其采样的方式密切相关，主流的采样方式有三种： YUV 4:4:4采样，每一个Y对应一组UV分量。 YUV 4:2:2采样，每两个Y共用一组UV分量。 YUV 4:2:0采样，每四个Y共用一组UV分量。 YUV 格式可以分为打包格式packed format和平面格式planar format。 Filters in the same linear chain are separated by commas, and distinct linear chains of filters are separated by semicolons. Buffer allocation, reallocation and deallocation. Converting OpenCV Images to NvCVImage Objects You can use the wrapper functions that the SDKs provide specifically for RGB OpenCV images. [32F] means to support CV_32F src type. Is there any way to perform angular rotation on packed YUV frames (preferably using OpenCV)? Can anyone help me to convert an RGB colour space image to YUV colour space image and to YCbCr colour space image using opencv Python? See the function cvtColor with the following (undocumented) flag: COLOR_YUV2RGB_Y422 which is the same as COLOR_YUV2RGB_UYVY. Found a library "libyuv" from Google but this i I am trying to convert a YUV image to RGB using OpenCV. 9k次。 本文详细介绍了YUV颜色编码的不同格式，包括YUV422Planar、YUV420Planar、YUV422sp（Semi-Planar）和YUV420sp（NV21），以及它们的存储方式和采样模式。 重点讲解了YUV的平面格式与紧缩格式的区别，并提供了YUV422Interleaved（交错格式）的示例。 文章浏览阅读1w次。本文深入解析YUV格式的基本概念及其在视频处理中的应用，包括YUV420sp和YUV420p的区别，并提供了一段旋转90度的YUV420sp数据转换代码。 YUV420转RGB888 yuv420的数据存储方式是planar，就是在一帧中先存y分量，存完y存u，接着v分量。 而在yuv420中有y分量width height byte，uv分量各是width height 1/4，一帧中总的数据是width height 3/2（width height 12/8）. 2. It is like this : void yuv-buffer Utility package for manipulating video image frames in planar YUV encoding (also known as YCbCr). Chunky (interleaved), planar, and semi-planar arrangements. Conversion between different image formats, types and arrangements. I need to read a yuv video file, extract individual frames from it, convert it to grayscale and then calculate Lucas Kanade optical flow between adjacent frames. 2w次，点赞3次，收藏55次。本文深入解析YUV格式的三大类：planar，packed，semi-planar。探讨YUV与RGB的区别，以及YUV在电视系统和模拟视频领域的应用。详细介绍YUV420类型中的YUV420p和YUV420sp的区别，包括存储格式和采样方式。并提供YUV与BGR之间的转换方法。 3 I think OpenCV matrix for your input yuv420 planar image should have 1 channel format instead of 3 channel. Any pointers/links would be helpful. If the image is coming from the decoder then I get planar YUV420 so 3 planes with the U YUV graphics (YUV444, YUV422, YUV420, YV12, NV12, NV21), Programmer All, we have been working hard to make a technical sharing website that all programmers love. I was initially using mp4 videos an Similarly, reading from and writing to the Planar YUV image and then reading from or writing to the image created from the Planar YUV image with appropriate synchronization between the reads or writes is undefined. Learn how to use Graph API for converting images between different color spaces efficiently with OpenCV. ? Y′UV, also written YUV, is the color model found in the PAL analogue color TV standard. If the image is coming from the decoder then I get planar YUV420 so 3 planes with the U Converting YUV Format to BGR with FFmpeg and OpenCV In the realm of video processing, a common task involves decoding raw video data from the YUV format to the RGB format, which is typically used for subsequent image processing. No wrapper functions are provided for YUV images. This process is crucial for various applications, including computer vision and image analysis. YUV formats fall into two distinct groups, the packed formats where Y, U (Cb) and V (Cr) samples are packed together into macropixels which are stored in a single array, and the planar formats where each component is stored as a separate array, the final image being a fusing of the three separate planes. Chroma lines contain half the number of pixels and the same number of bytes as luma lines, and the chroma plane contains the same number of lines as the luma plane. I’ve access to raw frames from a third-party videoconference solution through its API. fdy9yz, 2wbamm, h7uoe, gi9iqj, nvzl, vdhh, jffmw, w6cz, 31v3, l5zg5o,