pyramid

Name

pyramid - create a pyramid data structure

Syntax

 pyramid [-l] [-s] [-r <rank>] [-g] [-n <levels>] \\
     <inimage> <outimage>

Description

Create a pyramid data structure from the first band of the input image inimage, write the resulting image to outimage. By default, the bottom layer will have the same size as the input image, (-1 if odd), and the resampling technique is two by two average.

Options

-l: Let the bottom band have the smallest square power of two size larger than the input.
-s: Let the bottom band have the largest square power of two size smaller than the input.
-r rank: Use rank=rank; the rank'th sorted pixel value in the window as resampling result (rank = 1..4).
-g: Use Gaussian pyramid, ref. IEEE trans. on Comm. 1983, no.4, page 532, with a=0.4. 1983, no.4, page 532 with a=0.4.
-n levels: Spesify the number of levels wanted in the pyramid (default: all possible levels).

Use only one of -l and -s or none. If none, then integer division by 2 is performed as far as possible.

If none of the options are used, mean pyramid is performed.

Restrictions

Input image must have pixel type unsigned byte.

Author

Tor Lønnestad, BLAB, Ifi, UiO

Revised

Helene Schulerud, BLAB, Ifi, UiO, Svein Bøe, Blab, Ifi, UiO

Id

$Id: pyramid.c,v 1.30 1997/06/19 08:40:26 svein Exp $

Examples

 pyramid mona.img monaPyr.img
 pyramid -l mona.img mona.PyrL.img
 pyramid -s -r 4 mona.img mona.PyrS.img
 pyramid -g mona.img mona.PyrG.img