A method and a system for acquiring user finger parameters in a projection touchpad

Abstract

The invention provides a method and a system for acquiring user finger parameters in a projection touch pad. The method comprises the steps of shooting a current image of a projection plane, carryingout difference operation on the top view of the current image and the comparison image to obtain a difference image, judging whether the difference image contains a user finger contour or not, if so,extracting the user finger contour in the difference image, decoding two-dimensional coordinates of each point on the user finger contour on the difference image, and determining the main direction and the finger pulp width a of the user finger; determining a fingertip point Pf at the farthest end of the finger outline of the user and a plane central axis according to the main direction, taking Npoints on the plane central axis as reference points, and calculating three-dimensional coordinates of the Pf and the N reference points in the difference image; and calculating the three-dimensionalcoordinates of the user finger parameter Pi according to the Pf and the three-dimensional coordinates of the N reference points. Based on the method provided by the invention. The problem of how to control the cursor by the user on the projection touch pad is solved.

Description

technical field [0001] The invention relates to the field of human-computer interaction, in particular to a method and system for acquiring user finger parameters in a projection touch panel. Background technique [0002] From the invention of the computer to the present, how to interact more naturally and conveniently between humans and machines has always been a hot topic that people are exploring. Traditional human-computer interaction methods, such as keyboards and mice, use external hardware devices to interact with machines. [0003] With the development of human-computer interaction technology and terminal equipment, portable intelligent equipment has become an indispensable product in people's life, such as smart phones, tablet computers and so on. Due to the portability requirements of smart devices, the devices are getting smaller and smaller. The traditional human-computer interaction methods are not portable enough and cannot be suitable for today's interaction ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method and system for acquiring user finger parameters in a projection touch panel, which increases the interactive interface of human-computer interaction, and can track the position and trajectory of the user finger in real time based on the user finger parameters quickly obtained from the image, thereby solving the problem of user Problems navigating the cursor on a projected touchpad

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