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version (2.69 KB) by Francisco de Castro
Increases the resolution of an image by interpolation


Updated Mon, 21 May 2018 11:00:05 +0000

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IIR Increases the size of an image by interpolation
B= IIR(inputfile,f) returns the image stored in file 'inputfile' with resolution increased by factor f in both dimensions. 'filename' must be a valid graphic file (jpg, gif, tiff, etc.). It can be grayscale or color.
Parameter 'f' is the size increase ratio, so to increase by 50%
use f= 1.5, to double size (in each dimension) use f= 2.
Additional parameters:
B= IIR(A,f,'Display','off') eliminates display of both images, the original and the modified. Deafult 'on'
B= IIR(A,f,'Method',method) Allows to choose between five methods of interpolation: linear, spline, pchip, cubic or v5cubic. 'method' must be a string character. Default 'linear'

B= iir('myimage.jpg',2);

The screenshot shows the effect of increasing resolution by 3. Original size: 600x402. After: 2400x1608.
(I took the photo myself. No copyright problems).

Cite As

Francisco de Castro (2022). iir(filename,f,varargin) (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2007a
Compatible with any release
Platform Compatibility
Windows macOS Linux

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