nv12-nv21

How to convert sRGB to NV12 format using NumPy?

由 久未见 提交于 2020-01-03 20:54:15
问题 NV12 format defines specific color channels ordering of YUV color space with 420 subsampling. NV12 format is mostly used in video encoding/decoding pipeline. libyuv description of NV12: NV12 is a biplanar format with a full sized Y plane followed by a single chroma plane with weaved U and V values. NV21 is the same but with weaved V and U values. The 12 in NV12 refers to 12 bits per pixel. NV12 has a half width and half height chroma channel, and therefore is a 420 subsampling. In context of

How to convert sRGB to NV12 format using NumPy?

由 五迷三道 提交于 2020-01-03 20:53:51
问题 NV12 format defines specific color channels ordering of YUV color space with 420 subsampling. NV12 format is mostly used in video encoding/decoding pipeline. libyuv description of NV12: NV12 is a biplanar format with a full sized Y plane followed by a single chroma plane with weaved U and V values. NV21 is the same but with weaved V and U values. The 12 in NV12 refers to 12 bits per pixel. NV12 has a half width and half height chroma channel, and therefore is a 420 subsampling. In context of

How to convert sRGB to NV12 format using NumPy?

由 ╄→гoц情女王★ 提交于 2020-01-03 20:53:26
问题 NV12 format defines specific color channels ordering of YUV color space with 420 subsampling. NV12 format is mostly used in video encoding/decoding pipeline. libyuv description of NV12: NV12 is a biplanar format with a full sized Y plane followed by a single chroma plane with weaved U and V values. NV21 is the same but with weaved V and U values. The 12 in NV12 refers to 12 bits per pixel. NV12 has a half width and half height chroma channel, and therefore is a 420 subsampling. In context of

NV12 format and UV plane

由 守給你的承諾、 提交于 2019-12-23 10:14:05
问题 i am a little confused about the NV12 format. i am looking the this page to understand the format. What i currently understand is that if you have an image or video of 640 x 480 diminsion then the Y plane will be having 640 x 480 bytes and U and V both planes have 640/2 x 480/2 . It does not mean that U plane have 640/2 x 480/2 and V plane have 640/2 x 480/2 both have only 640/2 x 480/2 bytes. so the total number of bytes in out buffer array will be. 2 is multiplied with (640/2) * (480/2)

NV21 format and odd image dimensions

由 你说的曾经没有我的故事 提交于 2019-12-10 17:08:40
问题 I have been working for some time with NV21 images in Android and I have been tracking a bug that might be caused by incorrect indexing bytes in an NV21 image. The image in the answer of this question has a nice overview of how the Y, U and V bytes are positioned in the image buffer. Not sure it is allowed, but I am embedding it below: What happens when the image has odd dimensions (as in parity)? Is that even possible in this format? Do we have an official specification of this format

Confusion on YUV NV21 conversion to RGB

由 本秂侑毒 提交于 2019-11-26 19:46:44
According to http://developer.android.com/reference/android/graphics/ImageFormat.html#NV21 , NV21 is the default used format. There are quite a number of code on web regarding YUV NV21 to RGB conversion. However, when I go through the code, I doubt on the correctness of the code. The first component V should come first, followed by first component U According to http://wiki.videolan.org/YUV#NV21 , NV21 is like NV12, but with U and V order reversed: it starts with V. However, when I went through the code implementation http://pastebin.com/T0my7zSc - It assumes U comes first https:/
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