Assuming you don't have the data that generated the figure to begin with, try grabit from the File Exchange. It estimates the coordinates of data in an image that contains a figure.
Extract data from raster plot
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Is there a way to extract frequency data from this raster plot?
I am looking to get the data on time of occurrence of each dot with the corresponding neuron number from matlab from .mat figure of this type.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1089295/image.png)
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