Count If

Include <mln/core/algorithm/count.hpp>

std::ptrdiff_t count(InputImage ima, const Value &v)

Count the number of pixel whose value is v in ima.

Parameters:

• ima – The image to be traversed

• v – The value to be counted

Template Parameters:

• InputImage – A model of InputImage

• Value – A model of Value

Returns:

number of v in ima

Examples

1. Count the number of v in an image:

   mln::image2d<mln::rgb8> ima = ...;
   mln::rgb8 v = ...;
   std::ptrdiff_t nb_v = mln::count(ima, v);
   

Complexity

Linear in the number of pixels.