Set size of image without border and save

Question

md khan 2020-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/522526-set-size-of-image-without-border-and-save

评论： Ameer Hamza 2020-5-2

I have an original.jpg of size (320 * 240). After plotting some line on the image I get processed.jpg. But the size of processed.jpg is (504 * 353) with white border.

I need to processed.jpg to be the same size as original.jpg WITHOUT any white border. How to do that?

Attached is the code used to draw lines over the original image. I am using 2019a

img = imread('C:\Users\khan1\jupyter_test_code\CRBD\Images\crop_row_274.JPG');
data = load('C:\Users\khan1\jupyter_test_code\CRBD\TMGEM results\crop_row_274.tmg');
fig = figure;
imshow(img);
hold on
plot(data, 1:size(data,1), 'r', 'LineWidth', 1);

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Answer 1

Ameer Hamza 2020-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/522526-set-size-of-image-without-border-and-save#answer_429848

编辑：Ameer Hamza 2020-5-2

在 MATLAB Online 中打开

I guess you are use getframe to save the image with 3 lines. getframe cannot keep the resolution of the original image. You may use imresize(), but that will modify your original image to some extent. If you have computer vision toolbox, then you can use insertShape() to fuse the lines into the pixel of the image directly.

img = imread('crop_row_001.JPG');
data = load('crop_row_001.tmg').';
data2 = zeros(size(data,1), size(data,2)*2);
data2(:,1:2:end) = data;
data2(:,2:2:end) = repmat(1:size(data,2), size(data,1), 1);
img = insertShape(img, 'Line', data2, 'Color', 'r', 'LineWidth', 1);
imshow(img);
imwrite(img, 'filename')

P.S.: I used the image and data file from your other question, which I answered.

The attached image has resolution of 320 * 240.

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md khan 2020-5-2

编辑：md khan 2020-5-2

Thank you. But my figure do not have any redlines. What am I missing?

I see now! "load('crop_row_001.tmg').';:" is different. It works now. thanks!

Ameer Hamza 2020-5-2

I am glad to be of help.

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Answer 2

Image Analyst 2020-5-2

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在 MATLAB Online 中打开

Burning red dots into pixels does NOT change the size of the image. You must have done something else. Either burn the dots into the image,

rgbBurned = rgbImage; % Initialize to the original image with no graphics.
for k = 1 : length(x)
    row = round(y);
    col = round(y);
    % Burn a red dot in.
    rgbBurned(row, col, 1) = 255;
    rgbBurned(row, col, 2) = 0;
    rgbBurned(row, col, 3) = 0;
end
imwrite(rgbBurned, newFileName);