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HxDefuz.h File Reference

#include "HxImageRep.h"

Go to the source code of this file.

Functions

HxImageRep L_HXIMAGEREP HxDefuz (HxImageRep im, int windowSzX=5, int windowSzY=5, double thr=0.5)

(from ScilImage Help) defuz() performs a sharpening operation on the grey value image "in" and stores the result in the grey value image "out". More...

Detailed Description

Function Documentation

HxImageRep L_HXIMAGEREP HxDefuz ( HxImageRep im,

int windowSzX = 5,

int windowSzY = 5,

double thr = 0.5

)

(from ScilImage Help) defuz() performs a sharpening operation on the grey value image "in" and stores the result in the grey value image "out".
The image is scanned with a moving window with sizes "filt_x" and "filt_y". For each position, both minimum and maximum value are determined. The values of the minimum, maximum and center pixel value are denoted by MIN, MAX and C resp. The value of the last parameter "thr" is denoted by THR. The new value of the center pixel is calculated as follows:
if(C < MIN + THR * (MAX - MIN)) C = MIN; else C = MAX;
The last parameter THR indicates a bias towards either the local minimum or the local maximum value. In case THR == 0.5 there is no bias towards a direction. This means that if THR == 0.5 the center value is substituted by either min or max depending on whichever of the two is closest in value. If THR has value 0 the result is identical to a local maximum operation and if THR has value 1 the result is that of a local minimum filter. For non-linear sharpening the value of 0.5 is recommended for THR.
The bernsen_threshold() operation is comparable to defuz() without bias. However, instead of replacing the value of the center pixel by the local minimum or maximum, this pixel is assigned 0 or 1. The result of this operation will become very noisy in areas where there is no distinct difference between minimum and maximum. Therefore, with the last parameter "max_diff" the user can indicate the minimum required difference between the local minimum and maximum. If the difference is less, the center pixel is assigned 1 by default.

00012 { 00013 HxTagList tags; 00014 HxAddTag(tags, "windowSzX", windowSzX); 00015 HxAddTag(tags, "windowSzY", windowSzY); 00016 HxAddTag(tags, "thr", thr); 00017 00018 return im.neighbourhoodOp("defuz", tags); 00019 00020 }

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Functions
HxImageRep L_HXIMAGEREP	HxDefuz (HxImageRep im, int windowSzX=5, int windowSzY=5, double thr=0.5)
	(from ScilImage Help) defuz() performs a sharpening operation on the grey value image "in" and stores the result in the grey value image "out". More...