pvaluerank

Synopsis

Description

pvaluerank returns the indexth value (beginning with 1) in the input grayscale image or graph im_in.

This operator is useful to get the threshold value of an image yielded by a thresholding operator.

Parameters

• index is an integer from [1..MAX+1], where MAX depends on the type image type (e.g., 255 for a Uchar image). If the value is greater than the higher value than the higher value is used.

Inputs

• im_in: a grayscale image, a region map or a graph.

Result

Returns the indexth value or FAILURE if the indexth value does not exit. This value can be get using operator pstatus.

Examples

Returns the value of the first threshold yielded by a Chanda thresholding of the tangram.pan image (Unix version)

   pchanda 10 tangram.pan a.pan
   pvaluerank 1 a.pan
   threshold=`pstatus`

Returns the value of the first threshold yielded by a Chanda thresholding of the tangram.pan image (MsDos version)

   pchanda 10 tangram.pan a.pan
   pvaluerank 1 a.pan
   call pstatus
   call pset threshold

See also

C++ prototype

Version française

Détermination de la ieme valeur d'une image.