FilterLaplace  Method

Description         This method will filter the image with the Laplace filter. The method works for only monochrome, 8 and 24 bit per pixel images.

Examples

Description: 8bitgray                                          Description: macskalaplace8

The original 210 x 180 pixel image and the 8 neighboured Laplace filtered image.

Syntax                 RetVal = [BiFilter.]FilterLaplace  hDib iMode 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.

                            iMode                     Long                This parameter specifies the filter matrix.

Available values:

LAPLACE_4_NEIGHBOURALL (0)

LAPLACE_4_NEIGHBOURNORTH (1)

LAPLACE_4_NEIGHBOURWEST (2)

 

LAPLACE_8_NEIGHBOURALL (10)

LAPLACE_8_NEIGHBOURNORTH (11)

LAPLACE_8_NEIGHBOURWEST (12)

LAPLACE_8_NEIGHBOURNORTHWEST (13)

LAPLACE_8_NEIGHBOURNORTHEAST (14)

                            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.

 

Matrix of the Laplace 4 neighbour-all filter:

Matrix of the Laplace 4 and 8 neighbour-north filter:

Matrix of the Laplace 4 and 8 neighbour-west filter:

Matrix of the Laplace 8 neighbour-all filter:

Matrix of the Laplace 8 neighbour-north-west filter:

Matrix of the Laplace 8 neighbour-north-east filter:

See Also              FilterUniform Method, FilterGauss Method, FilterGradient Method, FilterEnhance Method, FilterWeightedMean Method