FilterMedian  Method

Description         This function will filter the image by the nonlinear median filter method. This function works for only monochrome, 8 bit per pixel and 24 bit per pixel images. A median filter operation on an image removes long tailed noise such as negative exponential and salt and pepper type noise from the image with a minimum blurring of the image. Median filter is defined as:

Median(A) = median[A(x + i, y + j)]

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: median

Syntax                 RetVal = [BiFilter.]FilterMedian  hDib N iShowProgress hWnd

Returns               RetVal                    LONGLONG The handle of new filtered DIB, 0 if an error occurred, or -1 if the BIFilter.dll does not installed.

Remarks             hDib                       LONGLONG Handle of the image to filter.

                            N                             short                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.

                            iShowProgress       short                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 BIDlgs32.dll installed.

                            hWnd                     LONGLONG Handler of the parent window.

See Also