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
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