A dimensionality reduction method of handwritten characters in three-dimensional space based on directed cuboid

Abstract

The invention discloses a three-dimensional space handwritten character dimension reduction method. Existing three-dimensional character dimensionality reduction methods have large computational loador poor visibility. The invention is as follows: 1, defining an initial three-dimensional coordinate system; 2, obtaining the spatial coordinates of the moving fingertips and generating a set of discrete points; 3, establishing a directed cuboid for that discrete point set obtained in step 2 by using an OBB bounding box algorithm; 4, determining the adaptive projection plane; 5, establishing a projection two-dimensional coordinate system; 6, projecting that discrete point set onto the adaptive projection plane; 7, carrying out rotation correction; 8, connecting n output points in the output point set in turn to obtain the output trajectory. The resulting output trajectory is then output in the form of a picture. The invention can precisely reduce the dimension of three-dimensional handwritten characters, and ensures that a 2D image with a fixed direction can be obtained after the dimension reduction, thereby realizing better visualization effect and greatly improving the recognition rate of three-dimensional handwritten characters.

Description

technical field [0001] The invention belongs to the technical field of dimensionality reduction, and in particular relates to a method for dimensionality reduction of handwritten characters in three-dimensional space based on a directed cuboid. Background technique [0002] In the case of high dimensions, there will be problems of sparse data samples and difficult distance calculations. This problem is called "curse of dimensionality". An important way to alleviate the disaster of dimensionality is to reduce dimensionality, also known as "dimension reduction", that is, to transform the high-dimensional attribute space into a low-dimensional "space" through some mathematical transformation, so that not only the attribute dimension is reduced, but also the calculation cost is reduced. , but also increases the sample density. To solve this problem, many dimensionality reduction methods have been proposed. So far, traditional dimensionality reduction methods still have some sh...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for dimensionality reduction of handwritten characters in three-dimensional space based on a directional cuboid to solve the problems of random inversion of 2D characters and the existence of rotation angles in traditional dimensionality reduction methods, and to achieve better visualization Effect

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