#include "BIFILTER.H"
HANDLE CALLBACK FilterContraHarmonicMean( HDIB hDIB,
int N,
int P,
int iShowProgress,
HWND hParent)
Description
This function will filter the image by the nonlinear contra-harmonic mean method. This function works for only monochrome, 8 bit per bixel and 24 bit per pixel images. The contra-harmonic mean filter is member of a set of nonlinear mean filters which are better at removing Gaussian type noise and preserving edge features than the arithmetic mean filter. The contra-harmonic filter is very good at removing positive outliers for negative values of P and negative outliers for positive values of P. The definiton of contra-harmonic 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
The original 256 x 256 pixel image corrupted by additive Gauss noise and the contra-harmonic mean filtered image using a 5 x 5 pixel square mask and P = -2.
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 |
P |
This parameter specifies the value P in the equation above. 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.