Method get_block_rect

dlib/test/object_detector.cpp:190–190

This block of functions is meant to provide a way to map between the row/col space taken by this object's operator() function and the images supplied to load(). In this example it's trivial. However, in general, you might create feature extractors which don't perform extraction at every possible image location (e.g. the hog_image) and thus result in some more complex mapping.

        // However, in general, you might create feature extractors which don't perform extraction at every 
        // possible image location (e.g. the hog_image) and thus result in some more complex mapping.  
        inline const rectangle get_block_rect       ( long row, long col) const { return centered_rect(col,row,3,3); }
        inline const point image_to_feat_space      ( const point& p) const { return p; } 
        inline const rectangle image_to_feat_space  ( const rectangle& rect) const { return rect; } 
        inline const point feat_to_image_space      ( const point& p) const { return p; }