is it im2double() have the same result with double()?

i read a image name it 'lena'

is it im2double(lena) == double(lena)?

[Stephen23]

No.

Answer 1

[Jan]

While double() converts the type of the data only, im2double() cares for the values also:

img = uint8([255, 127])
double(img)     % >> [255, 127] as double
im2double(img)  % >> [1, 0.498] as double

The values are scaled to the range [0.0, 1.0] as wanted.

Answer 2

[Spencer Chen]

Try it and tell us.

[budi agung]

it give different result what should i choose best for image processing ?

[Stephen23]

 im2double

[budi agung]

ok thx