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video processing command help

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James
James on 14 Jul 2011
Can anyone tell me what the following command does?
imgI = double(imread(imgIFile))
Thanks

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Accepted Answer

Jan
Jan on 14 Jul 2011
imglFile : String variable, which contains the name of an image file
imread: Read the image file into a Matlab array
double: convert the array to the double type.
The whole line imports the contents of the image file into a DOUBLE array. "help imread", "help double" would be helpful also.

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James
James on 14 Jul 2011
The double is what I am having difficulty understanding and "help double" does not help explain it either.
Please help
Sean de Wolski
Sean de Wolski on 14 Jul 2011
Your image is probably 8bit unsigned integer - that is, it can be any integer between 0 and 255. So, converting it to double allows it to be any value, up to 16 sigfigs between: 2.2251e-308 and 1.7977e+308
Walter Roberson
Walter Roberson on 14 Jul 2011
Note: it might perhaps make more sense to use im2double() as that rescales the data as well as changing the data type.

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