What is YUV9?
YUV9 is a video compression format commonly used in digital video encoding and decoding. It is an abbreviation for YUV 4:1:0, which represents the color space and sampling ratio used in the format. YUV, also known as YCbCr, is a color encoding system widely used in video and image processing.
In the YUV color model, the brightness information (Y) is separated from the color information (U and V). The numbers 4:1:0 indicate the sampling ratio between these components. YUV9 is called 4:1:0 because the U and V components are subsampled horizontally and vertically compared to the Y component.
The Y component represents the grayscale or brightness information of the video, while the U and V components carry the color information. By subsampling the U and V components, YUV9 reduces the amount of data required for encoding, resulting in more efficient compression. This is especially beneficial in applications where video quality needs to be maintained while reducing bandwidth or storage requirements.
One advantage of using YUV9 is that the human visual system is more sensitive to changes in brightness (Y) compared to changes in color (U and V), hence subsampling the color components is less noticeable to the viewer. However, it is important to note that excessive subsampling can lead to a loss of color detail and may affect the overall perceived video quality.
In summary, YUV9 is a video compression format that utilizes a 4:1:0 color space and sampling ratio. It separates brightness (Y) from color (U and V) and subsamples the color components to achieve efficient compression while maintaining reasonable visual quality.
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