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PEANOSCAN

Section: User Commands (1)
Updated: 16 Mar 1998
Index

NAME

peanoScan - scan an image in "peano" order

SYNTAX

peanoScan [-p <power>] [-x <outxsize>] [-y <outysize>]
<inimage> <outimage>

DESCRIPTION

This program will transform an image into a onedimensional signal while conserving the neighborhoodproperties. This is done by using the space fillingcurve called Peano Curve.An input image will bescanned according to the Peano curve rules and thepixel values will be written in horizontal lines inan output image.

This transformation is well suited for texture analysisand for compression, as it utilizes the correlation betweenneighboring pixels in both directions.

If no -p powerargument is supplied, scanning iscontinuous over one maximal square window of size somepower of two.

OPTIONS

-p power

Peano scanning over windows of size (2**power)*(2**power).Default: one large window.

-x outxsize

Width of the output image. Default = 512.

-y outysize

Height of the output image. Default: High enough to haveroom for the whole transformation.

EXAMPLES

Size of inimage: 128x128

The whole band is transformed.

Size of inimage: 127x1024

Only the upper left block of size 64x64 is transformed.

power=3

The image is scanned in sub-windows of size 8x8.

Size of inimage: 128x128The whole band is transformed in 16x16 separate blocks, eachof size 8x8

Size of inimage: 127x1024The upper, left block of size 120x1065 is transformed in15x128 separate blocks, each of size 8x8.

RESTRICTIONS

Accepts only usigned byte images.

REFERENCE

1) Joel Quinqueton and Marc Berthod
    "A Locally Adaptive Peano Scanning Algorithm"
    IEEE Transaction on Pattern Ana. and Machine Inte.
    Vol. PAMI-3, No. 4, July 1981
2) P. T. Nguyen and J. Quinqueton
    "Space Filling Curves and Texture Analysis"
    IEEE Transaction on Pattern Ana. and Machine Inte.
    Vol. 2, 1982.

KNOWN BUGS

One happy day there will be a "-i" switch for the inversetransform.

AUTHOR

Yogesan and Lřnnestad, BLAB, ifi, UiO

EXAMPLES

peanoScan mona.img mona_peano.img
peanoScan -p 4 mona.img mona_peano.img
peanoScan -p 3 -x 128 mona.img mona_peano.img
peanoScan -x 64 -y 64 mona.img mona_peano.img

ID

$Id: peanoScan.c,v 1.23 1996/12/06 19:17:46 svein Exp $

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