Outdoor augmented reality mark-point-free tracking registration method applicable to mobile terminal

Abstract

The invention provides an outdoor augmented reality mark-point-free tracking registration method applicable to a mobile terminal. The method comprises the steps that a sample image used for expressing a scene is obtained from each sample scene in the training preparation stage, and an index table of global feature descriptor matrixes for sample images of all scenes is established; the mobile terminal collects an image to be matched in the current scene in the tracking registration stage; the global feature descriptor matrixes of the image to be matched under different scales are extracted; the key frame image with the maximum similarity is selected from the sample images; local feature points of the image to be matched are matched with the local feature points of the key frame image, the matching point pairs with mismatch are removed; a homography matrix of the image to be matched, relative to the key frame image, is computed on the basis of the current remaining matching point pairs, a position matrix of the mobile terminal is computed by utilizing the homography matrix, and the tracking registration on the key frame image is realized on the basis of the position matrix.

Description

technical field [0001] The invention belongs to the technical field of mobile augmented reality, and in particular relates to an outdoor augmented reality markerless point tracking registration method suitable for mobile terminals. Background technique [0002] Augmented Reality (AR for short) is an important branch of Virtual Reality (VR for short) technology. Due to its potential broad application space, it has become an international research hotspot in recent years. VR technology emphasizes the user's complete immersion in sensory effects, that is, immersion in the virtual environment depicted by the computer, while the emerging AR technology relies on display technology, interactive technology, multiple sensing technologies, and computer graphics and multimedia. The technology integrates the virtual environment generated by the computer with the real environment around the user, so that the user can be sure that the virtual environment is a part of the real environment...

AI Technical Summary

Problems solved by technology

However, physical sensors usually have the problems of low refresh frequency and positioning accuracy, and there are problems with positioning accuracy and real-time performance. Especially in the case of bad weather, the positioning accuracy error is large, which affects the location-based augmented reality. overall performance of the application

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