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im2double

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Convert image to double precision.

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Syntax

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IM = im2double(I)

IM = im2double(I,'indexed')

Input argument

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I

Input image: scalar, vector, matrix or multidimensional array with type single, double, int16, uint8, uint16 or logical.

Output argument

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IM

The converted image is returned as a numeric array with the same dimensions as the input image I with type double.

Description

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IM = im2double(I) converts the input image I to double precision format. The input image IM can be a grayscale, truecolor, or binary image. When converting, im2double rescales the pixel values from their original integer format to a floating-point range of [0, 1].

For an indexed image, IM = im2double(I, 'indexed') converts the image I to double precision as well, but with an added offset of 1 to the pixel values during the conversion from integer types.

Example

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I = reshape(uint8(linspace(1,255,25)),[5 5]);
IM1 = im2double(I)
IM2 = im2double(I, 'indexed')

See also

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double, imread.

History

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Version	Description
1.0.0	initial version

Author

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Allan CORNET