Converting images into string and hence using imread and ROI specification.

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Yagnaseni Roy 2011-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/18458-converting-images-into-string-and-hence-using-imread-and-roi-specification

Hi,

I can open my image using imtool, but in order to specify a region of interest(ROI), the functions such as imroi, imread require the image to be stored as strings.

I converted my image into a string by typing

S= char(Me) %Me is the name of the image on the workspace

By doing this, it diplayed a huge array, which took around 30 secs..

However, after all that, when I put >> imread ('S'), it says : Error using imread (line 372) File "S" does not exist.

What did I do wrong?

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回答（2 个）

Jan 2011-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/18458-converting-images-into-string-and-hence-using-imread-and-roi-specification#answer_24790

imroi is an abstract class, therefore you cannot create an instance. In consequence you cannot call it even not with a string. If Me is the name of the image, it need not be converted to a string by the char command - it is a string already.

Please copy the complete commands you have used and explain, what you want to achieve. Note, that images do not have to be converted to strings in MATLAB.