iir(filename,f,vara​rgin)

Version 1.2.0.0 (2.69 KB) by Francisco de Castro
Increases the resolution of an image by interpolation
2.0
(2)
10K Downloads
Updated 21 May 2018

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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'

Example:
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 (2024). iir(filename,f,varargin) (https://www.mathworks.com/matlabcentral/fileexchange/21410-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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Version Published Release Notes
1.2.0.0

change description slightly
Interpolation in two domensions at once.
1.1.0.0

IIR now reads the graphics file directly.
More interpolation methods added
Improved display of grayscale images
1.0.0.0

Better title