How to decide the line step for YUV420 image

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

Hi , I am using the NPP library to convert YUV420(I420) to BGR format
the function I am using is :

NppStatus nppiYUV420ToBGR_8u_P3C3R(const Npp8u * const pSrc[3], int rSrcStep[3], Npp8u * pDst, int nDstStep, NppiSize oSizeROI);

but I can’t decided the rSrcStep ,my original image size is 1920x1080 (w*h) , I am trying
rSrcStep ={1920,1920/2,1920/2} ,but it return error code :NPP_STEP_ERROR

help will be appreciated ,thanks!

4

No idea for now, got to do the discussion with interal team if any suggestions to share.

5

Hi,

It is line step values, you can find the document below:

NVIDIA 2D Image And Signal Performance Primitives (NPP): Image-Processing Specific API Conventions

Line Step

The line step (also called “line stride” or “row step”) allows lines of oddly sized images to start on well-aligned addresses by adding a number of unused bytes at the ends of the lines. This type of line padding has been common practice in digital image processing for a long time and is not particular to GPU image processing
…

Thanks.

7

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