#include "BIFILTER.H"
HANDLE CALLBACK FilterDifference ( HDIB hDIB,
BYTE nDirection,
int iShowProgress,
HWND hParent)
Description
This function will first shift the input image in the specified direction and afterwards it will subtract the shifted image from the original. This algorithm is often used to detect simple edges easily. This function works for only 1, 8 and 24 bit per pixel images.
Examples
The original 180 x 210 pixel image and the difference filtered image with nDirection = DIFF_NORTHWEST_SOUTHEAST.
Parameters
|
HDIB |
hDIB |
Handle of the DIB to filter. |
|
BYTE |
nDirection |
Shifting direction. Available values: DIFF_HORIZONTAL (0) Horizontal DIFF_VERTICAL (1) Vertical DIFF_NORTHWEST_SOUTHEAST (2) North-West DIFF_NORTHEAST_SOUTHWEST (2) North-East |
|
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.