Crop image without change aspect ration of original image

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?

Answer 1

[Walter Roberson]

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, :);

[Malan Jayanka]

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]

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]);