Auto Contrast Filter

#include "BIFILTER.H"

 

HANDLE CALLBACK FilterAutoContrast(        HDIB     hDIB,
 int          iShowProgress,
HWND  hParent)

Description

This function will linearly stretch the histogram automatically to reach an optimum histogram distribution. If a nonlinear correction is needed use gamma correction function. This function works for only 8 bit per pixel and 24 bit per pixel images.

Examples

Description: macskaauto                                                  Description: macskaauto

The original 180 x 210 pixel image and the auto contrasted image.

Parameters

HDIB

hDIB

Handle of the DIB to filter.

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.