Is there a way to get the numerical values corresponding to a particular section of a histogram?

Hi folks,

I'm trying to threshold an image based on a histogram, but I need to eliminate all but a certain part of the histogram. I've attached an image below, with the highlighted part being an example of one I'm interested in. Is there a way to do this?

Thanks in advance

Answer 1

[Sai Sri Pathuri]

You may use Data Brushing. After plotting above graph,

• Go to Tools and select Brush
• On the plot, select the desired area and right click on it
• Choose 'Remove unbrushed data'

[Teshan Rezel]

Hi Sai, thanks for this! Is there a way to automate this process for a generalised graph, if I know that the points of interest are points of inflection?

[Sai Sri Pathuri]

Following answer may help

https://www.mathworks.com/matlabcentral/answers/383721-how-to-find-inflection-point-please-help

You may also search for 'how to find points of inflection on a graph in matlab'. There are a good number of answers which may help.