XXX_Parm

typedef struct XXX_Parm_tag {
  long  general;
  long  prep;
  short deskew_min;  short filler1;
  short noise_diameter_percent;
  short noise_diameter_pixel;
  short noise_width_percent;
  short noise_length_percent;
  short noise_width_pixel;
  short noise_length_pixel;
  INT_PTR hookparm;
} XXX_Parm;
    

Elements:

general

GENERAL_XXXCALL

prep

PREP_NOSPOTREMOVAL

switches off the removal of spots.

PREP_AUTO_NOISEREDUCTION

Adaptive controlled noise reduction.

PREP_RGBTOGRAY_COLORGRAY

This value is used to make a gray image from an image with colors in a medium way (default). PREP_RGBTOGRAY_COLORMIN and PREP_RGBTOGRAY_COLORMAX verwendet wird.

PREP_RGBTOGRAY_COLORMIN

This value is used to make a gray image from a color image in a bright way.

PREP_RGBTOGRAY_COLORMAX

This value is used to make a gray image from an image with colors in a dark way.

PREP_GRAYTOBIN_*

This value is used to generate a black & white image from a gray image.
PREP_GRAYTOBIN_VERY_THIN = Very light blackening.
PREP_GRAYTOBIN_THIN = Light blackening.
PREP_GRAYTOBIN_MEDIUM = Mean blackening.
PREP_GRAYTOBIN_THICK = Dark blackening.
PREP_GRAYTOBIN_VERY_THICK = Very dark blackening.

PREP_GRAYTOBIN_UNIFORM

If this value is set, then there is no adaptive thresholding. Instead, only one threshold will be used for binarization of the whole image. This is recommended whenever the given images are uniformly illuminated.

PREP_BINFILTER_*

With this parameter characters can be smoothed and ragged characters can be thickened or thinned out. Small objects such as smudges can be deleted. Dot-matrix print can be prepared for recognition. Five selections are possible:
PREP_BINFILTER_VERY_THIN = Smoothing with strong thinning.
PREP_BINFILTER_THIN = Smoothing with thinning.
PREP_BINFILTER_MEDIUM = Smoothing without thinning.
PREP_BINFILTER_THICK = Smoothing with thickening.
PREP_BINFILTER_VERY_THICK = Smoothing with strong thickening.

PREP_REMOVE_BACKGROUND_AUTO

Remove image background using histogram - (for color images only)

PREP_REMOVE_BACKGROUND

Remove image background - (for color images only)

PREP_INPLACE

Overwrite image in preprocessing

deskew_min

Threshold value for deskewing. Zero means no deskewing (default).

filler1

8 byte alignment

noise_diameter_percent, noise_diameter_pixel

Noise can be removed according to its diameter. This setting can be relative to the mean width of the character strokes or directly given in pixels.

noise_width_percent, noise_length_percent, noise_width_pixel, noise_length_pixel

Dirt removal can not only be controlled via the dirt diameter, but also over the width and length of the dirt. Should pixels be used for specification of the noise reduction, the parameters noise_width_pixel and noise_length_pixel must be set. For a relative specification, i.e. using a percentage of the stroke width, the parameters noise_width_percent, and noise_length_percent must be set. Noise will be removed if one of the settings for .._pixel or .._percent is found to be valid.

hookparm

For private use

Reference:

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