video processing command help

Can anyone tell me what the following command does?

imgI = double(imread(imgIFile))

Thanks

Answer 1

[Jan]

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.

[James]

The double is what I am having difficulty understanding and "help double" does not help explain it either.

Please help

[Sean de Wolski]

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]

Note: it might perhaps make more sense to use im2double() as that rescales the data as well as changing the data type.