trim a plot and modify mesh

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Federico Paolucci
Federico Paolucci 2022-12-12
编辑: Abhinaya Kennedy 2024-8-22,5:38
hi, I would like some advice on how to do this job: I have the plot obtained in matlab available. this plot presents several frames, one after the other, like film. each frame has dimensions of 0.025x0.1.
I have to do two things:
  • cut each frame separating it from the others
  • and then I have to convert the above dimensions to 0.1x0.1. for this activity I thought of using the griddata function, which allows me to switch from initial to final coordinates.
Thanks in advance for the advice

回答(1 个)

Abhinaya Kennedy
Abhinaya Kennedy 2024-8-22,5:34
编辑:Abhinaya Kennedy 2024-8-22,5:38
Step 1: Extract Frames
Assuming img is your data matrix and you know the dimensions and positions of each frame:
% Define frame dimensions and number of frames
frameHeight = 0.025; % Original height
frameWidth = 0.1; % Original width
numFrames = 10; % Example number of frames
% Preallocate cell array for frames
frameData = cell(1, numFrames);
% Extract each frame
for i = 1:numFrames
% Calculate indices for each frame (replace with actual logic)
rowStart = ...; % Define based on frame position
rowEnd = rowStart + frameHeight - 1;
colStart = ...;
colEnd = colStart + frameWidth - 1;
% Extract the frame
frameData{i} = img(rowStart:rowEnd, colStart:colEnd);
end
This will adjust rowStart, rowEnd, colStart, and colEnd based on the actual positions of your frames within the data.
Step 2: Resize Frames
Using imresize (https://www.mathworks.com/help/matlab/ref/imresize.html) for simplicity, especially if working with image data:
% Define new dimensions
newHeight = 0.1; % New height
newWidth = 0.1; % New width
% Resize each frame
resizedFrames = cell(1, numFrames);
for i = 1:numFrames
resizedFrames{i} = imresize(frameData{i}, [newHeight, newWidth]);
end

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