How to modified maximum pixel value in logical array
1 view (last 30 days)
Show older comments
Hello everyone i hope you are doing well.
I have the following image in which white pixel value exist 35,40,45,55
- I want to find the maximum pixel (index) for example in above 55 is the maximum pixel (index) then add 50 pixel in to to make new maximum value to 105
- Then i want to divided the each pixel value with the maximum value(105). Then map the value to 10000 e.g multiple new pixel value with 10000 so it will map between 1 to 10000
I have find the maximum and minimum pixel value as 35 and 55
idx = find(mask);
row1 = min(idx);
row2 = max(idx);
How can i do it in matlab
5 Comments
Answers (1)
DGM
on 13 Aug 2022
Edited: DGM
on 13 Aug 2022
I'm going to post this as a tentative answer. I doubt my interpretation of your intent is wholly correct, but it's probably correct enough to demonstrate inroads to a satisfactory answer.
% get mask array
load mask.mat
% get y-centers for each blob
CC = bwconncomp(mask,4); % picking 4-connectivity is important here
S = regionprops(CC,'centroid');
ycenters = vertcat(S.Centroid);
ycenters = ycenters(:,2); % y-center of each blob
% get input and output range
inrange = [min(ycenters) max(ycenters)+50]; % [35 105]
outrange = [1 10000];
% get rescaled values for each blob
blobvals = (outrange(2)-outrange(1))*(ycenters-inrange(1))/(inrange(2)-inrange(1))+outrange(1);
% recolor image according to calculated blob values
outpict = zeros(size(mask)); % preallocate
for b = 1:CC.NumObjects
outpict(CC.PixelIdxList{b}) = blobvals(b);
end
% [35 105] is scaled to [1 10000]
% but bear in mind that 55 is smaller than 105
pxrange = [min(nonzeros(outpict(:))) max(nonzeros(outpict(:)))]
See Also
Categories
Find more on Matrix Indexing in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!