VisionWorks OpenVX vx_array access problem.

Robotics & Edge Computing Jetson Systems Jetson TX2
1

Hi , i can not access vx_array it returns pointer. How can i turn vx_array to cv::Mat or other array type that i can use it.

vxuOpticalFlowPyrLK(context,(vx_pyramid)vxGetReferenceFromDelay(pyr_delay, -1), (vx_pyramid)vxGetReferenceFromDelay(pyr_delay, 0),
            (vx_array)vxGetReferenceFromDelay(pts_delay, -1), (vx_array)vxGetReferenceFromDelay(pts_delay, -1),
            vxflow, VX_TERM_CRITERIA_BOTH,s_lk_epsilon_, s_lk_num_iters_, initial_estimate, window_dimension);

In this sample vxflow is vx_array and i want to make mathematical operations with this array. But for example i want to print array in normal “cout” or “printf” it returns address (like 0x101b4cb0).

2

Hi,

Here is sample to access vx_array value for your reference:
[url]https://devtalk.nvidia.com/default/topic/1032913/jetson-tk1/vx_array-access-feature_tracker-demo/post/5396508/#5396508[/url]

Thanks.

3

Hi, Thanks for your answer.

4

Hi,

Could you help to check the value of numItems.

Segmentation fault is usually cased by the accessing of invalid memory.
Please help to check if the numItems return a value larger than zero first.

Thanks.