Category Archives: What is yuy2

What is yuy2

By | 21.03.2021

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I am having trouble understanding the exact difference between the two. From research, more discuss the two as being different but a few seem to group them under the "4 2 2" sampling scheme. However, in I, chroma planes blue and red projections are sub-sampled only in the horizontal dimension, still by a factor of 2.

Thus, there is the same amount of lines in chroma planes as in the luma plane. For a 2x2 group of pixels, there are 4 Y samples and 2 U and 2 V samples each. In YUY2, the chroma samples are sub-sampled by a factor of 2.

In YUY2, the succession for 2 pixels, starts by one luma for the first pixel, then U, then another luma for the second pixel and then V again. I ask this because I am doing image processing tasks in Matlab and have been converting with YUY2 in mind. I thought it was the same as YUV the indicated original colour space of my imagesbut now I am wondering if my conversions are not as accurate as can be.

I is planar format, that is, a Luma plane, followed by two Chroma planes, where every plane contains only data for a single channel.

Basically a version of YV16 with swapped U and V planes. YUY2 is interleaved: Four subsequent color components form two horizontally neighbored pixels aka macropixel. Learn more. Asked 4 years ago. Active 3 years, 3 months ago. Viewed 3k times. DragonDance27 DragonDance27 65 1 1 silver badge 6 6 bronze badges. So what is your question? These formats only have different channel ordering, therefore it is not possible to be "not accurate" in conversion. It either looks good, or mixed up altogether.

Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.YUV is a color encoding system typically used as part of a color image pipeline. It encodes a color image or video taking human perception into account, allowing reduced bandwidth for chrominance components, thereby typically enabling transmission errors or compression artifacts to be more efficiently masked by the human perception than using a "direct" RGB-representation.

Color information U and V was added separately via a subcarrier so that a black-and-white receiver would still be able to receive and display a color picture transmission in the receiver's native black-and-white format.

The use of the letter Y for luminance can be traced back to the choice of XYZ primaries. Likewise, U and V were chosen to differentiate the U and V axes from those in other spaces, such as the x and y chromaticity space. See the equations below or compare the historical development of the math. The luma component already existed as the black and white signal; they added the UV signal to this as a solution.

The UV representation of chrominance was chosen over straight R and B signals because U and V are color difference signals. In other words, the U and V signals tell the television to shift the color of a certain pixel without altering its brightness.

Or the U and V signals tell the monitor to make one color brighter at the cost of the other and by how much it should be shifted. The higher or the lower when negative the U and V values are, the more saturated colorful the pixel gets. The closer the U and V values get to zero, the lesser it shifts the color meaning that the red, green and blue lights will be more equally bright, producing a greyer pixel.

This is the benefit of using color difference signals, i. In turn this meant that when the U and V signals would be zero or absent, it would just display a greyscale image. It was necessary to assign a narrower bandwidth to the chrominance channel because there was no additional bandwidth available.

Equivalently, substituting values for the constants and expressing them as matrices gives these formulas for BT. Note that for small values of Y' it is possible to get R, G, or B values that are negative so in practice we clamp the RGB results to the interval [0,1].

Still in coverage of the CIE color space the Rec. Approximation means that the precision of the used numbers input data, output data and constant values is limited, and thus a precision loss of typically about the last binary digit is accepted by whoever makes use of that option in typically a trade-off to improved computation speeds.

For clarification the variables are using two suffix characters: "u" is used for the unsigned final representation, and "t" is used for the scaled-down intermediate value. The examples below are given for BT. The same principle can be used for doing functionally equivalent operations using values that do an acceptable match for data that follows the BT.

These ranges are important in video editing and production, since using the wrong range will result either in an image with "clipped" blacks and whites, or a low-contrast image.This topic describes the and bit YUV formats that are recommended for capturing, processing, and displaying video in the Microsoft Windows operating system. These formats use a fixed-point representation for both the luma channel and the chroma C'b and C'r channels.

Precision conversions can be performed using simple bit shifts. The bit representations described here use little-endian WORD values for each channel. The bit formats also use 16 bits for each channel, with the lowest 6 bits set to zero, as shown in the following diagram.

Because the bit and bit representations of the same YUV format have the same memory layout, it is possible to cast a bit representation to a representation with no loss of precision. It is also possible to cast a bit representation down to a bit representation.

The Y and Y formats are an exception to this general rule, however, because they do not share the same memory layout. When the graphics hardware reads a surface that contains a bit representation, it should ignore the low-order 6 bits of each channel.

If a surface contains valid bit data, however, it should be identified as a bit surface. Alpha is assumed to be a linear value that is applied to each component after the component has been converted into its normalized linear form. For images in video memory, the graphics driver selects the memory alignment of the surface.

That is, individual lines within a surface are guaranteed to start at a bit boundary, although the alignment can be larger than 32 bits.

The origin 0,0 is always the upper-left corner of the surface. For the purposes of this documentation, the term U is equivalent to Cband the term V is equivalent to Cr. If the format is packed, the first character is 'Y'. The final two characters in the FOURCC indicate the number of bits per channel, either '16' for 16 bits or '10' for 10 bits. No formats for bit or bit YUV have been defined at this time. This section describes the memory layout of each format.

They share the same memory layout, but P uses 16 bits per channel and P uses 10 bits per channel. In these two formats, all Y samples appear first in memory as an array of WORD s with an even number of lines. The surface stride can be larger than the width of the Y plane. This array is followed immediately by an array of WORD s that contains interleaved U and V samples, as shown in the following diagram.

The stride of the combined U-V plane is equal to the stride of the Y plane. The U-V plane has half as many lines as the Y plane. These two formats are the preferred planar pixel formats for higher precision YUV representations.

In these two planar formats, all Y samples appear first in memory as an array of WORD s with an even number of lines. The U-V plane has the same number of lines as the Y plane. In these two packed formats, each pair of pixels is stored as an array of four WORD s, as shown in the following illustration. Y is identical to Y except that each sample contains only 10 bits of significant data.

The least significant 6 bits are set to zero, as described previously. This format is a packed bit representation that includes 2 bits of alpha.

what is yuy2

Bits contain the U sample, bits contain the Y sample, bits contain the V sample, and bits contain the alpha value. To indicate that a pixel is fully opaque, an application must set the two alpha bits equal to 0x This format is a packed bit representation that includes 16 bits of alpha.This topic describes the 8-bit YUV color formats that are recommended for video rendering in the Windows operating system. This article is intended for anyone working with YUV video decoding or rendering in Windows.

Numerous YUV formats are defined throughout the video industry. This article identifies the 8-bit YUV formats that are recommended for video rendering in Windows.

Decoder vendors and display vendors are encouraged to support the formats described in this article. This article does not address other uses of YUV color, such as still photography. The formats described in this article all use 8 bits per pixel location to encode the Y channel also called the luma channeland use 8 bits per sample to encode each U or V chroma sample.

what is yuy2

However, most YUV formats use fewer than 24 bits per pixel on average, because they contain fewer samples of U and V than of Y. This article does not cover YUV formats with bit or higher Y channels. For the purposes of this article, the term U is equivalent to Cb, and the term V is equivalent to Cr. Chroma channels can have a lower sampling rate than the luma channel, without any dramatic loss of perceptual quality. The following diagrams shows how chroma is sampled for each of the downsampling rates.

Luma samples are represented by a cross, and chroma samples are represented by a circle. There are two common variants of sampling. For this reason, the MPEG-2 scheme is preferred in Windows, and should be considered the default interpretation of formats. This section describes the 8-bit YUV formats that are recommended for video rendering. These fall into several categories:. This is a packed format, where each pixel is encoded as four consecutive bytes, arranged in the sequence shown in the following illustration.

Both are packed formats, where each macropixel is two pixels encoded as four consecutive bytes. This results in horizontal downsampling of the chroma by a factor of two. In YUY2 format, the data can be treated as an array of unsigned char values, where the first byte contains the first Y sample, the second byte contains the first U Cb sample, the third byte contains the second Y sample, and the fourth byte contains the first V Cr sample, as shown in the following diagram.

It is expected to be an intermediate-term requirement for DirectX VA accelerators supporting video. This format is the same as the YUY2 format except the byte order is reversed—that is, the chroma and luma bytes are flipped Figure 4.Every day thousands of users submit information to us about which programs they use to open specific types of files. While we do not yet have a description of the YUY2 file format and what it is normally used for, we do know which programs are known to open these files.

See the list of programs recommended by our users below. We are constantly working on adding more file type descriptions to the site - the current count exceeds thousand by far, and more information about YUY2 files will hopefully be added soon.

Since we do not have any programs listed that we have verified can open YUY2 files, we suggest that you try a universal file viewer like Free File Viewer. It can open over different types of files - and very likely yours too! Download Free File Viewer.

We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files. If you have additional information about the YUY2 file format or software that uses files with the YUY2 suffix, please do get in touch - we would love hearing from you. Chrome Firefox Firefox Firefox.

Software that will open, convert or fix YUY2 files Unfortunately we have not received enough suggestions for software that can open YUY2 files yet. Try a universal file viewer Since we do not have any programs listed that we have verified can open YUY2 files, we suggest that you try a universal file viewer like Free File Viewer. How-to guides Windows 10 Chrome Search Engines.

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What is a file extension? We help you open your file. Original downloads only.These are several different ways to represent colors.

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In YUV colorspace there is one component that represent lightness luma and two other components that represent color chroma. As long as the luma is conveyed with full detail, detail in the chroma components can be reduced by subsampling filtering, or averaging which can be done in several ways thus there are multiple formats for storing a picture in YUV colorspace.

YV12 is such a format where chroma is shared in every 2x2 pixel block that is supported by AviSynth.

what is yuy2

It can be downloaded here. In order to use the YV12 support without doing any color conversions you have to load your AVI in VirtualdubMod and select "fast recompress". Still there are two advantages:. In this mode the process will stay in YV12 all the necessary filtering has to be done in AviSynth itself.

Under compression select a codec which support YV12, like Xvid, DivX5, RealVideo provided you download the lastest binaries or 3ivx D4 provided you download the lastest binaries. If you want to preview the video you also need a YV12 decompressor.

In principal all internal filters support YV12 natively. Which color formats the filters support is specified in the documentation. The plugins which are compiled for AviSynth v2.

Chroma Subsampling Tutorial - 4:4:4 / 4:2:2 Explained

New plugins are listed in this sticky. Most of them support YV12 see documentation.

what is yuy2

This happens due to a bug in old versions of DivX5. Download the latest binaries or use " SwapUV clip ". Install a codec which supports YV If that still doesn't work, modify your registry as explained in the next question. Ok, apparently your video is not decompressed by DivX 5. Try to use VCSwap utility for hot swapping video codecs. Advanced user can also do it by hand. DLL, or add the following to your registry file:. Capturing in YV12 is not recommended due to issues of interlacing and chroma; YUY2 will generally pose fewer problems.Click on the links below to access the current live stocks of webcams at these popular retailers.

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Recommended 8-Bit YUV Formats for Video Rendering

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