Separate region by an equation
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
How to separate a region by an equation. For example I want to find the region greater than the equation y = mx + c.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/151299/image.png)
1 Kommentar
Ced
am 2 Nov. 2015
Bearbeitet: Ced
am 2 Nov. 2015
How is your image saved?
If you have e.g. matrix A with the pixel values for each (x,y) pair, and you want all the pixels above y = mx + c (i.e. y - m*x - c > 0) to be zero, then:
m = -1;
c = 1;
x = 0:0.01:1; % your x values
y = 0:0.01:1; % your y values
% logical matrix for each x/y pair
logical_matrix = false(length(x),length(y));
for i = 1:length(x) % for each x value
for j = 1:length(y) % for each y value
logical_matrix(i,j) = (y(j) - m*x(i) - c > 0);
end
end
% now set corresponding values in your A matrix to the desired value
A(logical_matrix) = 0;
You can of course do this more efficiently without for loops, but the exact form will depend on how you saved your matrix/object/whatever it is you have.
Antworten (0)
Siehe auch
Kategorien
Mehr zu Image Processing Toolbox finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!