Image Processing; converting images

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Damian Wierzbicki
评论： Damian Wierzbicki 2017-7-6
Hi guys. I have images in .im7 format. I've loaded them into Matlab using PivMat and ReadIMX, then formatted them into .mat files ( images ? ). Now, I'm trying to covert them to either .jpg , .tif , .png , .bmp using imwrite but I cannot do so because 'type was struct'. Can I efficiently go from 'structure' format to any of the formats that imwrite recognizes ?
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KSSV
KSSV 2017-7-6
You have to extract the required pixel information from the structure and use imwrite.
Damian Wierzbicki
Damian Wierzbicki 2017-7-6
Thank you. If you don't mind me asking: what information would that be ? x ( 1x2048 double ) and y ( 1x2048 double ) and also w ( 2048x2048 double) also the unitx and unity are 'mm' - how'd I deal with that ? These are probably really stupid question, but I just want to make sure if I'm doing it wright.

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回答（2 个）

KSSV
KSSV 2017-7-6
You need to pick the matrix 2048*2048 and use imwrite
https://in.mathworks.com/help/matlab/ref/imwrite.html
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Thorsten
Thorsten 2017-7-6
编辑：Thorsten 2017-7-6
Imwrite assumes double input data to be in the range [0, 1]. Everything above 1 will be mapped to 1, resulting in an all-white image. So you have to map your data to the range [0, 1].
Damian Wierzbicki
Damian Wierzbicki 2017-7-6
Thank you Thorsten, used mapminmax to map my data to desired range, not sure if that's what you meant ? It now displays the image ok, but with horizontal black thin lines ? There are also, hardly visible, white thin vertical lines along the image ? Any idea what might be causing it ?

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Image Analyst
Image Analyst 2017-7-6
Try this:
storedStructure = load(filename) % Don't use semicolon
% Now extract the image field into its own variable.
rgbImage = storedStructure.myImage; % Or whatever the field for the image is called.
imwrite(rgbImage, 'my RGB image.PNG');

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