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doxygen classify/normfeat.cpp

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Jim O'Regan 2015-07-20 12:43:47 +01:00
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classify/normfeat.cpp
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@ -15,50 +15,50 @@
** See the License for the specific language governing permissions and
** limitations under the License.
******************************************************************************/
/**----------------------------------------------------------------------------
/*----------------------------------------------------------------------------
Include Files and Type Defines
----------------------------------------------------------------------------**/
----------------------------------------------------------------------------*/
#include "normfeat.h"
#include "intfx.h"
#include "featdefs.h"
#include "mfoutline.h"
/**----------------------------------------------------------------------------
/*----------------------------------------------------------------------------
Public Code
----------------------------------------------------------------------------**/
----------------------------------------------------------------------------*/
// Return the length of the outline in baseline normalized form.
/** Return the length of the outline in baseline normalized form. */
FLOAT32 ActualOutlineLength(FEATURE Feature) {
return (Feature->Params[CharNormLength] * LENGTH_COMPRESSION);
}
/*---------------------------------------------------------------------------*/
// Return the character normalization feature for a blob.
//
// The features returned are in a scale where the x-height has been
// normalized to live in the region y = [-0.25 .. 0.25]. Example ranges
// for English below are based on the Linux font collection on 2009-12-04:
//
// Params[CharNormY]
// The y coordinate of the grapheme's centroid.
// English: [-0.27, 0.71]
//
// Params[CharNormLength]
// The length of the grapheme's outline (tiny segments discarded),
// divided by 10.0=LENGTH_COMPRESSION.
// English: [0.16, 0.85]
//
// Params[CharNormRx]
// The radius of gyration about the x axis, as measured from CharNormY.
// English: [0.011, 0.34]
//
// Params[CharNormRy]
// The radius of gyration about the y axis, as measured from
// the x center of the grapheme's bounding box.
// English: [0.011, 0.31]
//
/**
* Return the character normalization feature for a blob.
*
* The features returned are in a scale where the x-height has been
* normalized to live in the region y = [-0.25 .. 0.25]. Example ranges
* for English below are based on the Linux font collection on 2009-12-04:
*
* - Params[CharNormY]
* - The y coordinate of the grapheme's centroid.
* - English: [-0.27, 0.71]
*
* - Params[CharNormLength]
* - The length of the grapheme's outline (tiny segments discarded),
* divided by 10.0=LENGTH_COMPRESSION.
* - English: [0.16, 0.85]
*
* - Params[CharNormRx]
* - The radius of gyration about the x axis, as measured from CharNormY.
* - English: [0.011, 0.34]
*
* - Params[CharNormRy]
* - The radius of gyration about the y axis, as measured from
* the x center of the grapheme's bounding box.
* - English: [0.011, 0.31]
*/
FEATURE_SET ExtractCharNormFeatures(const INT_FX_RESULT_STRUCT& fx_info) {
FEATURE_SET feature_set = NewFeatureSet(1);
FEATURE feature = NewFeature(&CharNormDesc);