Crop image without change aspect ration of original image

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Malan Jayanka
Malan Jayanka 2016-10-9
评论： Image Analyst 2016-10-9
I want to do these kind of conversion. Output image must be 256*256 pixel. I want to crop image and remain the main leaf part in the output image without change the aspect ratio of original image. Is this possible in matlab?

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回答（1 个）

Walter Roberson
Walter Roberson 2016-10-9
https://www.mathworks.com/help/images/ref/imcrop.html#inputarg_rect
imcrop() and pass a rectangle whose width and height are 256, 256. A section that size will be extracted. The pixel sizes will not have changed, so the aspect ratio of the extracted area will be 1:1 . If you are displaying it afterwards, give the command
axis equal
or
axis image
You do not even need imcrop for this purpose: you can do it by plain array indexing
Extracted = YourImage(First_row : First_row + 255, First_column : First_column + 255, :);
  2 个评论
Malan Jayanka
Malan Jayanka 2016-10-9
编辑：Malan Jayanka 2016-10-9
I have used crop function but I got output like this
But I want to get whole leaf part into 256*256 region
[rgbImage,map] = imread('DSC_0001.jpg');
[heigth,width,dim] = size(rgbImage);
cropedImage = imcrop(rgbImage,map,[2000 1000 256 256]); imshow(cropedImage);
Also plz give me example how to use axis equal
Image Analyst
Image Analyst 2016-10-9
Then that portion is not 256x256 - it's bigger. So crop out a bigger portion, then use imresize() to shrink it down.
croppedImage = imcrop(rgbImage,map,[2000 1000 512 512]);
croppedImage = imresize(croppedImage, [256,256]);

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