Range Filter

#include "BIFILTER.H"

 

HANDLE CALLBACK FilterRange(               HDIB         hDIB,
int           N,
int           iShowProgress,
HWND  hParent)

Description

This function will filter the image by the nonlinear range filter method. This function works for only monochrome, 8 bit per bixel and 24 bit per pixel images. The range filter is used to find edges within an image. Definition of the range filter is :

where the coordinate (x+i, y+j ) is defined over the image A and the coordinate (i, j) is defined over the N x N size square mask.

Examples

Description: Gauss                                    Description: range

The original 256 x 256 pixel image corrupted by additive Gauss noise and the range filtered image using a 5 x 5 pixel square mask.


Parameters

HDIB

hDIB

Handle of the DIB to filter.

int

N

This parameter specifies the size of the square mask. N cannot be less than 1. See the description and examples above for further information and a possible value.

int

iShowProgress

This parameter specifies the displaying of the progressbar and the preview dialog.

Available values:

DISPLAY_NONE (0)      -     The progressbar and the preview dialog will not display before filtering.

DISPLAY_PROGRESS (1) -The progressbar will display during filtering procedure.

DISPLAY_DIALOG (2) -     The preview dialog will display before filtering. This dialog shows the part of the image before and after filtering.

DISPLAY_BOTH (3)      -     The progressbar and the preview dialog will display.

IMPORTANT: The preview dialog will only display, if there is BiDlgs.dll installed.

HWND

hParent

Handler of the parent window.

Return values

The handle of the new filtered DIB or NULL if an error occurred.

Programming notes

The function will not free the input DIB.

Requirements

Header :    Declared in BIFilter.h; include BIFilter.h.

Library :    Use BIFilter.lib.

DLLs :       BIFilter.dll , BIDlgs32.dl.