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Pgmabel User Manual(0) Pgmabel User Manual(0)NAMEpgmabel - create cross section using Abel Integration for DeconvolutionSYNOPSISpgmabel[-help] [-axisaxis] [-factorfactor] [-pixsizepixsize] [-left|-right] [-verbose] [filespec]DESCRIPTIONThis program is part of Netpbm(1).pgmabelreads as input a PGM image, which it assumes to be an image of a rotational symmetric transparent object. The image must have a vertical symmetry axis.pgmabelproduces as output an image of a cross-section of the image.pgmabeldoes the calculation by performing the Abel Integration for Deconvolution of an axial-symmetrical image by solving the system of linear equations. After integration,pgmabelweights all gray-values of one side by the surface area of the calculated ring in square pixels divided by 4*factormultiplied by the size of one pixel (pixsize). With the-verboseoption,pgmabelprints the weighting factors. Where the caculation generates a negative result, the output is black. The computation is unstable against periodic structures with size 2 in the vertical direction.OPTIONSYou can abbreviate any option to its shortest unique prefix.-helpPrints a help message.-axisaxisPosition of the axis of symmetry in the image in pixels from the left edge of the image. Default is the center of the image.-factorfactorUser defined factor for enhancement of the output. Use afactorless than 1 for decreasing gary values. Default is 1.0.-pixsizepixsizeThe size of a pixel for getting scale invariant. Default is 0.1.-leftCalculate only the left side of the image. You cannot specify bothleftandright.-rightAnalogous to-left.-verboseprint information about the calculation.EXAMPLERotate a PGM image to get an image with a vertical axis of symmetry, then calculate the cross section: pnmrotate 90 file.pgm | pgmabel -axis 140 >cross_section.pgmSEEALSOpnmrotate(1), pgm(1),HISTORYThis program was added to Netpbm in Release 10.3 (June 2002).AUTHORVolker Schmidt (leftiATvoyager.de) Copyright (C) 1997-2002 German Aerospace research establishment netpbm documentation June 2002 Pgmabel User Manual(0)