Is it possible to change color for the plot function in opticalFlow class?

Question

hekimgil 2016-5-31

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回答： Oskar Wilhelmsson 2018-3-24

The plot function in opticalFlow class ( see here ) has three name-value pair arguments. I assumed other regular plot arguments would work too but obviously they don't. I tried to use 'color' unsuccessfully.

I plan to superimpose the plots on images and the current blue color is hardly visible... So my question is: is there any way to change the color of this plot?

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Answer 1

Anand 2016-6-2

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在 MATLAB Online 中打开

Unfortunately, this can't be done directly. You need to find a handle to the underlying quiver plot and modify it. Here's some code to help you:

% Compute and plot optic flow
opflow = opticalFlow(randn(100,100),randn(100,100));
plot(opflow,'DecimationFactor',[10 10],'ScaleFactor',10);
% Find quiver handle
q = findobj(gca,'type','Quiver');
% Change color to red
q.Color = 'r';

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hekimgil 2016-8-8

Thank you Anand. It did work but it slowed things much. Still, this seems to be the only way...

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Answer 2

Oskar Wilhelmsson 2018-3-24

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I ran into a similar problem. Using "clf" in the beginning of the video loop will make sure the color is always the same, which is what I think you actually want.