List of Spatial Filters

The following is a list of the predefined spatial filters that can be applied using the L_SpatialFilterBitmap function:

Value	Meaning
FLT_EMBOSS_N FLT_EMBOSS_NE FLT_EMBOSS_E FLT_EMBOSS_SE FLT_EMBOSS_S FLT_EMBOSS_SW FLT_EMBOSS_W FLT_EMBOSS_NW	[#define] Creates an image with an embossed appearance. (This is used for artistic effect, but is listed here because it is one of the predefined filters.) Choose the appropriate value for the direction of the effect.
FLT_GRADIENT_N FLT_GRADIENT_NE FLT_GRADIENT_E FLT_GRADIENT_SE FLT_GRADIENT_S FLT_GRADIENT_SW FLT_GRADIENT_W FLT_GRADIENT_NW	[#define] Detects edges using a Gradient directional filter. All pixels not on the detected edges are changed to black. Choose the appropriate value for the direction of the effect.
FLT_LAPLACE_1 FLT_LAPLACE_2 FLT_LAPLACE_3 FLT_LAPLACE_DIAG FLT_LAPLACE_HORZ FLT_LAPLACE_VERT	[#define] Applies Laplacian line detection. There are three omnidirectional filters and three bi-directional ones. All pixels not on the detected lines are changed to black.
FLT_SOBEL_HORZ FLT_SOBEL_VERT	[#define] Applies Sobel edge detection. All pixels not on the detected edges are changed to black. (The usage is the same as Prewitt, but the algorithm is different.) Choose the appropriate value for horizontal or vertical detection.
FLT_PREWITT_HORZ FLT_PREWITT_VERT	[#define] Applies Prewitt edge detection. All pixels not on the detected edges are changed to black. (The usage is the same as Sobel, but the algorithm is different.) Choose the appropriate value for horizontal or vertical detection.
FLT_SHIFTDIFF_DIAG FLT_SHIFTDIFF_HORZ FLT_SHIFTDIFF_VERT	[#define] Applies shift-and-difference edge detection. All pixels not on the detected edges are changed to black. Choose the appropriate value for diagonal, horizontal, or vertical detection.
FLT_LINESEG_HORZ FLT_LINESEG_VERT FLT_LINESEG_LTOR FLT_LINESEG_RTOL	[#define] Applies line segment line detection. You can use this filter to find line discontinuities in an image. All pixels not on the detected line segments are changed to black. Choose the appropriate value for horizontal, vertical, left-to-right diagonal, or right-to-left diagonal detection.