What's the best way to rotate image 180 degrees in Libargus?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
1

I wish to rotate the collected images by 180 degrees. I’m using Libargus example 09_argus_camera_jpeg with Orin Nano with devkit 35.3.1 and a Sony IMX296 sensor.

I tried transforming the surface using the following Transform parameters, but it didn’t work. What would be a good alternative? Is there any good documentation on this?

    NvBufSurf::NvCommonTransformParams transform_params = {
        .src_width = width,
        .src_height = height,
        .src_top = 0,
        .src_left = 0,
        .dst_width = width,
        .dst_height = height,
        .dst_top = 0,
        .dst_left = 0,
        .flag = NVBUFSURF_TRANSFORM_FILTER,
        .flip = NvBufSurfTransform_Rotate180,
        .filter = NvBufSurfTransformInter_Algo3, 
    };
3

You can try the flip-method of the nvvidconv or program sensor REG for it.

4

@ShaneCCC Like I said, I’m not using Gstreamer for this. I would like to extend the Argus example 09 to be able to flip the image. Is there a reason why transforming with the NvCommonTransformParams won’t work?

Also, can you show/explain which sensor register to program?

5

You need consult with sensor vendor for the REG setting due to each sensor is different REG setting.
Also you can try below API.

https://docs.nvidia.com/jetson/l4t-multimedia/group__V4L2Conv.html#ga3a54aa5b2a122cd5212926a59aae0eab

8

Hi,
Please try the setting:

        .flag = NVBUFSURF_TRANSFORM_FILTER | NVBUFSURF_TRANSFORM_FLIP,
9

That worked! Thank you @DaneLLL.

10

One addition:
I also needed to cast the rvalue to NvBufSurfTransform_Transform_Flag like so

.flag = (NvBufSurfTransform_Transform_Flag)(NVBUFSURF_TRANSFORM_FILTER |
                                                        NVBUFSURF_TRANSFORM_FLIP),
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12

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