NvBufferTransform() on grayscale image unexpectedly changes intensity

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

I’m using NvBufferTransform() to scale an image with format NvBufferColorFormat_GRAY8. I’m finding that the intensities in the image are changing unexpectedly. For example, solid black regions in the image with intensity 0 should continue to have intensity 0 after the transformation, but instead, they have intensity 84. I’ve tested with both the NvBufferTransform_Filter_5_Tap and NvBufferTransform_Filter_Nearest filters and upscaling and downscaling, and all exhibit this behavior.

Does anyone know what might be causing this unusual behavior?

2

Scaling with ARGB32 format seems to work fine so this issue may be specific to how the VIC handles grayscale images. For our application, we desire to use grayscale.

4

Hi,
Please check if you can reproduce it by running the sample:

/usr/src/jetson_multimedia_api/samples/07_video_convert

If yes, please share the steps. And do you use Jetpack 4.6.3 or 5.1?

5

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