calc function overload to handle separate horizontal (u) and vertical (v) flow components (to avoid extra splits/merges)

[flow_u, flow_v] = obj.calcUV(I0, I1)
[flow_u, flow_v] = obj.calcUV(I0, I1, 'OptionName',optionValue, ...)

Input

• I0 first 8-bit single-channel input image.
• I1 second input image of the same size and the same type as I0.

Output

• flow_u computed horizontal flow image that has the same size as I0 and type single (1-channel1).
• flow_v computed vertical flow image that has the same size as I0 and type single (1-channel1).

Options

• InitialFlowU specify initial U-flow. Not set by default.
• InitialFlowV specify initial V-flow. Not set by default.

Note that flow(:,:,1)==flow_u, and flow(:,:,2)==flow_v.