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otf2psf

Convert optical transfer function to point-spread function

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Syntax

PSF = otf2psf(OTF)
PSF = otf2psf(OTF,sz)

Description

example

PSF= otf2psf(OTF)computes the inverse Fast Fourier Transform of the optical transfer function (OTF) and creates a point-spread function (PSF), centered at the origin.

PSF= otf2psf(OTF,sz)specifies the size,sz, of the output point-spread function.

Examples

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Open Live Script

Create a point-spread function (PSF).

PSF = fspecial('gaussian',13,1);

转换光学的PSFTransfer Function (OTF).

OTF = psf2otf(PSF,[31 31]);

Convert the OTF back to a PSF.

PSF2 = otf2psf(OTF,size(PSF));

Plot the PSF and the OTF.

subplot(1,2,1) surf(abs(OTF)) title('|OTF|'); axissquareaxistightsubplot(1,2,2) surf(PSF2) title('Corresponding PSF'); axissquareaxistight

Figure contains 2 axes objects. Axes object 1 with title |OTF| contains an object of type surface. Axes object 2 with title Corresponding PSF contains an object of type surface.

Input Arguments

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Optical transfer function, specified as a numeric array of any dimension.

Data Types:single|double|int8|int16|int32|int64|uint8|uint16|uint32|uint64
Complex Number Support:Yes

Size of the output point-spread functionPSF, specified as a vector of positive integers. The size ofPSFmust not exceed the size ofOTFin any dimension. By default,PSFis the same size asOTF.

Data Types:double

Output Arguments

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Point-spread function, centered at the origin, returned as a numeric array of sizesz.

Data Types:double
Complex Number Support:Yes

Tips

  • To center the PSF at the origin,otf2psfcircularly shifts the values of the output array down (or to the right) until the (1,1) element reaches the central position, then it crops the result to match dimensions specified bysz.

  • This function is used in image convolution and deconvolution when the operations involve the FFT.

Version History

Introduced before R2006a

See Also

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