How do you mark and extract an area from an imagesc-figure?

Question

Frederik Schmidt 2020-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/622418-how-do-you-mark-and-extract-an-area-from-an-imagesc-figure

编辑： Adam Danz 2021-2-10

Hi guys,

I'm looking for a tool that works in a similar way to Matlab's brush tool.

I graph a spectrogram of a signal, i.e. a 2D array, using imagesc. In this spectrogram I would like to manually mark a certain area and extract the data within this area. For this purpose I tried to use Matlab's brush tool. But obviously it doesn't work for imagesc-figures. Can you help me and suggest solutions? Is there another tool from Matlab that works for imagesc-figures?

Thanks for your help.

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Answer 1

Adam Danz 2020-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/622418-how-do-you-mark-and-extract-an-area-from-an-imagesc-figure#answer_521373

编辑：Adam Danz 2021-2-10

"I would like to manually mark a certain area and extract the data within this area."

There's a few things you could do. Check out

ginput

Requiring Image Processing Toolbox:

drawfreehand | freehand
drawcircle
drawassisted | drawcrosshair | drawcuboid | drawellipse | drawline | drawpoint | drawpolygon | drawpolyline | drawrectangle

See ROI creation overview for details.

You can use these tool to select a region and return the coordinates of your selection. Then you can use those coordinates to isolate a section of your data.