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video processing command help

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James
James 2011-7-14
Can anyone tell me what the following command does?
imgI = double(imread(imgIFile))
Thanks

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Jan
Jan 2011-7-14
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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Sean de Wolski
Sean de Wolski 2011-7-14
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 2011-7-14
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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