Vips.Image.countlines (original) (raw)

Method

VipsImagecountlines

Declaration [src]

int
vips_countlines (
  VipsImage* in,
  double* nolines,
  VipsDirection direction,
  ...
)

Description [src]

Function which calculates the number of transitions between black and white for the horizontal or the vertical direction of an image. black<128 , white>=128 The function calculates the number of transitions for all Xsize or Ysize and returns the mean of the result Input should be one band, 8-bit.

This method is not directly available to language bindings.

Parameters

nolines

Type: double*

Output average number of lines.

The argument will be set by the function.

direction

Type: VipsDirection

Count lines horizontally or vertically.

...

Type: ``

NULL-terminated list of optional named arguments.

Return value

Type: int

0 on success, -1 on error.