Multi-touch trajectory tracking method

Abstract

The invention discloses a multi-touch trajectory tracking method. The method comprises the following steps of: A, calculating initial states of each touch point and acquiring the data of each touch point; B, predicting the possible position of each touch point in the next frame by a semi-Kalman filtering method; C, in a given threshold range, searching the touch point which is in the nearest Euclidean distance of a predicted position in a current frame; if the touch point is searched, performing correlation; and otherwise, taking a predicted value as the position of the touch point in the current frame; D, judging whether a new touch point is added into the current frame; a new touch point is detected, performing the step A on the new touch point, and performing a step E on other touch points; and E, judging whether a trajectory is ended in the current frame. In the method, the initial states and the ending states of the touch points are judged by a three-frame iteration method; the probability of misjudging a noise into the touch point is avoided to a certain degree; the influence of the noise on a correct trajectory is improved; and particularly the correctness of the judgment of the new touch point and the ending trajectory is improved.

Description

A multi-touch trajectory tracking method technical field The invention relates to the fields of image analysis, target detection and target tracking, in particular to a multi-point touch trajectory tracking method. Background technique With the introduction of touch technology into the mobile phone market by APPLE, touch interaction technology has changed the way people communicate with machines through mechanical buttons in the past. With the diversification of application methods, touch technology has also developed from the initial single-point touch to multi-touch, and the application occasions have also extended from small-sized mobile phone screens to large interactive screens. However, due to the limitations of material technology and electronic components, the application of touch technology on large screens has been greatly challenged. At present, there are touch interactive screens based on infrared, resistance, capacitance, embedded and ultrasonic in the marke...

AI Technical Summary

Problems solved by technology

The development of single-point touch technology is relatively mature, and it is widely used in small-size touch devices, such as touch mobile phones, PDAs, etc., but the effect in large-size touch devices still needs to be improved. The main reasons affecting the touch effect are raw material restrictions, electronic components The internal noise of the device, environmental factors and unintentional accidental contact, resulting in false touch points, resulting in misoperation

In addition, the single-touch function is relatively simple and can only express a limited number of interactive operations. Therefore, the development of multi-touch technology can make the interaction between human and machine more natural.

Multi-touch involves simultaneous touch and movement of multiple touch points, which makes the detection problem very serious. For example, in an optical image-based touch device, if two touch points are close to each other, they may be misjudged as one touch point; Problems such as "ghost spots" mentioned in the industry are prone to occur in touch devices based on infrared grid format

Another problem caused by detection errors is that when multiple touch points move at the same time, the correct tracking track cannot be obtained, making the formed tracks crosstalk with each other

The use of complex image processing and data association technologies can improve the accuracy of detection to a certain extent, but the real-time performance of the product will inevitably be affected

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