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Open Source Computer Vision Library
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76 lines
2.7 KiB
76 lines
2.7 KiB
Video Analysis |
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============== |
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.. highlight:: cpp |
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gpu::BroxOpticalFlow |
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-------------------- |
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.. ocv:class:: gpu::BroxOpticalFlow |
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Class computing the optical flow for two images using Brox et al Optical Flow algorithm ([Brox2004]_). :: |
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class BroxOpticalFlow |
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{ |
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public: |
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BroxOpticalFlow(float alpha_, float gamma_, float scale_factor_, int inner_iterations_, int outer_iterations_, int solver_iterations_); |
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//! Compute optical flow |
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//! frame0 - source frame (supports only CV_32FC1 type) |
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//! frame1 - frame to track (with the same size and type as frame0) |
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//! u - flow horizontal component (along x axis) |
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//! v - flow vertical component (along y axis) |
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void operator ()(const GpuMat& frame0, const GpuMat& frame1, GpuMat& u, GpuMat& v, Stream& stream = Stream::Null()); |
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//! flow smoothness |
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float alpha; |
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//! gradient constancy importance |
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float gamma; |
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//! pyramid scale factor |
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float scale_factor; |
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//! number of lagged non-linearity iterations (inner loop) |
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int inner_iterations; |
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//! number of warping iterations (number of pyramid levels) |
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int outer_iterations; |
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//! number of linear system solver iterations |
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int solver_iterations; |
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GpuMat buf; |
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}; |
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gpu::interpolateFrames |
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---------------------- |
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Interpolate frames (images) using provided optical flow (displacement field). |
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.. ocv:function:: void gpu::interpolateFrames(const GpuMat& frame0, const GpuMat& frame1, const GpuMat& fu, const GpuMat& fv, const GpuMat& bu, const GpuMat& bv, float pos, GpuMat& newFrame, GpuMat& buf, Stream& stream = Stream::Null()) |
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:param frame0: First frame (32-bit floating point images, single channel). |
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:param frame1: Second frame. Must have the same type and size as ``frame0`` . |
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:param fu: Forward horizontal displacement. |
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:param fv: Forward vertical displacement. |
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:param bu: Backward horizontal displacement. |
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:param bv: Backward vertical displacement. |
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:param pos: New frame position. |
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:param newFrame: Output image. |
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:param buf: Temporary buffer, will have width x 6*height size, CV_32FC1 type and contain 6 GpuMat: occlusion masks for first frame, occlusion masks for second, interpolated forward horizontal flow, interpolated forward vertical flow, interpolated backward horizontal flow, interpolated backward vertical flow. |
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:param stream: Stream for the asynchronous version. |
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.. [Brox2004] T. Brox, A. Bruhn, N. Papenberg, J. Weickert. *High accuracy optical flow estimation based on a theory for warping*. ECCV 2004.
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