The Dense Optical Flow module sample demonstrates the Dense Optical Flow pipeline on multiple hardware units:
The Dense Optical Flow sample accepts RAW videos, h264 videos, or live camera input data from an AR0231 (revision >= 4) sensor. It then applies an optical flow algorithm to estimate motion vectors between frames.
The DenseOpticalFlow sample, sample_denseopticalflow, accepts the following optional parameters. If none are specified, it performs detections on a supplied pre-recorded video.
./sample_denseopticalflow --input-type=[video|camera] --video=[path/to/video] --camera-type=[camera] --camera-group=[a|b|c|d] --camera-index=[0|1|2|3] --estimationMode=[UHP|HP|HQ] --nvencNo=[0|1] --pvaNo=[0|1]
Where:
--input-type=[video|camera] Defines if the input is from live camera or from a recorded video. Live camera is supported only on NVIDIA DRIVE(tm) platforms. It is not supported on Linux (x86 architecture) host systems. Default value: video --video=[path/to/video] Specifies the absolute or relative path of a raw, lraw or h264 recording. Only applicable if --input-type=video Default value: path/to/data/samples/stereo/left_1.h264 --camera-type=[camera] Specifies a supported AR0231 `RCCB` sensor. Only applicable if --input-type=camera. Default value: ar0231-rccb-bae-sf3324 --camera-group=[a|b|c] Is the group where the camera is connected to. Only applicable if --input-type=camera. Default value: a --camera-index=[0|1|2|3] Indicates the camera index on the given port. Default value: 0 --estimationMode=[UHP|HP|HQ] Indicates the quality and the performance of Dense Optical Flow algorithm: - HP: High Performance - UHP: Ultra High Performance - HQ: High Quality Default value: HP --nvencNo=[0|1] Indicates on which Nvidia Video Encoder the corresponding stage of the pipeline is to be executed. Default value: 0 --pvaNo=[0|1] Indicates on which PVA engine the corresponding stage of the pipeline is to be executed. Default value: 0
./sample_denseopticalflow --input-type=video --video=<video file>
./sample_dense_opticalflow --input-type=camera --camera-type=<camera type> --camera-group=<camera group> --camera-index=<camera idx on camera group>
./sample_denseopticalflow --nvencNo=1 --pvaNo=1
The sample creates a window and displays a video with two sections. The section above demonstrates the original video, whereas the section below shows the result of Dense Optical Flow with color coding presented at https://hci.iwr.uni-heidelberg.de/Correspondence_Visualization/.
For more information, see Dense Optical Flow.