

#include <nitro/prc.h>
typedef enum PRCResampleMethod
{
PRC_RESAMPLE_METHOD_NONE = 0,
PRC_RESAMPLE_METHOD_DISTANCE,
PRC_RESAMPLE_METHOD_ANGLE,
PRC_RESAMPLE_METHOD_RECURSIVE,
} PRCResampleMethod;
PRC_RESAMPLE_METHOD_NONE |
No resampling. |
PRC_RESAMPLE_METHOD_DISTANCE |
Use the next point if the city block distance exceeds the threshold. |
PRC_RESAMPLE_METHOD_ANGLE |
If the angle differs from the line previously used by at least threshold, the next point will be used. The angle is in units of 2π/65536 radians. |
PRC_RESAMPLE_METHOD_RECURSIVE |
Recursively processes so the points are used that cause all of the points before resampling to be distant from the line segments after resampling by no more than threshold. |
This enumerated type is contained in the argument PRCInputPatternParam in the PRC_InitInputPatternEx function.
If raw input strokes are used as is, there will be too many points, and an unsteady hand will cause much additional noise. Therefore, a resampling process that keeps only the characteristic points is required. This enumerated type is for specifying the algorithm that is used to resample.
PRC_RESAMPLE_METHOD_NONEPRC_RESAMPLE_METHOD_DISTANCEthreshold, it uses the next point. Additionally, it always uses each final image point. It does not use normal Euclidean distances, but instead uses city block distance (logical sum of the x coordinate difference and the y coordinate difference).PRC_RESAMPLE_METHOD_ANGLEFX_Atan2Idx to calculate the angle at each input point. Therefore the threshold is expressed using a u16 range for a complete circle (for example, a right angle is 16384). Processing speed is in the mid range.PRC_RESAMPLE_METHOD_RECURSIVEthreshold, it uses the point. If the distance is less, it discards the point. If point C is used, it then creates two new pairs of A and B points from the A-C pair and the C-B pair. It then recursively repeats the above process.For details on resampling algorithms, see docs/TechnicalNotes/PatternRecognition.pdf.
PRCInputPatternParam
PRC_InitInputPattern*
PRC_ResampleStrokes*
2005/02/18 Revised file name of reference document.
2004/06/23 Initial version.
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