Method

VipsImagemeasure

Declaration [src] 

int
vips_measure (
  VipsImage* in,
  VipsImage** out,
  int h,
  int v,
  ...
)

Description [src]

Analyse a grid of colour patches, producing an array of patch averages. The mask has a row for each measured patch and a column for each image band. The operations issues a warning if any patch has a deviation more than 20% of the mean. Only the central 50% of each patch is averaged.

If the chart does not fill the whole image, use the optional left, top, width, height arguments to indicate the position of the chart.

Optional arguments

  • left: area of image containing chart
  • top: area of image containing chart
  • width: area of image containing chart
  • height: area of image containing chart

See also

vips_avg(), vips_deviate().

This method is not directly available to language bindings.

Parameters

out

Type: VipsImage

Array of measurements.

The argument will be set by the function.
The caller of the method takes ownership of the returned data, and is responsible for freeing it.
h

Type: int

Patches across chart.

v

Type: int

Patches down chart.

...

Type: 

NULL-terminated list of optional named arguments.

Return value

Type: int

0 on success, -1 on error.