Optimized laser projection virtual keyboard

Abstract

The invention discloses an optimized laser projection virtual keyboard. The device comprises a carrier platform, an image acquisition module, a laser keyboard projection module, a laser positioning module, an image processing and identification module, a communication module and a power supply module. The carrier platform is an upright metal shell. The image acquisition module is a camera; the laser keyboard projection module comprises a visible red laser lamp and a grating lens containing a keyboard pattern; the laser positioning module comprises a near infrared light emitter and a word grating lens. The image processing and identification module is an embedded microcontroller. The communication module comprises a USB driver chip and a USB driver circuit. After optimization, the laser projection virtual keyboard processes and recognizes the image through embedded microcontroller, which can be used directly through USB connection computer, and the microcontroller has built-in interference elimination algorithm for large objects and external interference elimination algorithm.

Description

technical field [0001] The invention relates to the technical field of electronic information, in particular to an optimized laser projection virtual keyboard. Background technique [0002] With the development of technology, human-computer interaction is developing in a natural and non-invasive direction. Image processing and projection can be combined more flexibly, naturally and transparently. As an important input device for computers, the keyboard is unavoidable in the foreseeable future. What is missing is that the traditional physical keyboard is bulky and not easy to carry, which cannot meet the requirements of portability. Therefore, it is necessary to design and develop a laser projection virtual keyboard system that is small in size, easy to carry, easy to use, and strong in stability. [0003] The existing laser projection virtual keyboard has the following disadvantages: first, the self-made virtual keyboard is large in size and inconvenient to carry; second, th...

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Problems solved by technology

[0006] Aiming at the problems of inconvenient portability, inconvenient use, and poor anti-interference performance of the existing laser projection virtual keyboard, the present invention proposes a simple structure, low price, small size, easy to carry, easy to use, good stability, and can complete An optimized laser projection virtual keyboard that replaces the traditional physical keyboard, using visible red laser light to project the keyboard pattern; using a word laser to assist positioning; using a camera to collect image information; the collected image is processed by an embedded microcontroller Processing and identification, it can be used directly by connecting to the computer via USB; the communication between the virtual keyboard and the PC is carried out by using the USB communication module, and the algorithm of eliminating large object interference is adopted, which can effectively eliminate the interference of large objects inside the keyboard area and realize the palm Or the arm can be placed on the laser projection virtual keyboard, and there will be no false touch phenomenon; the algorithm of eliminating external interference is adopted, and when there are other objects around the keyboard, it will not interfere with the normal input of the keyboard, which solves the problem of carrying the existing laser projection virtual keyboard. Inconvenient, inconvenient to use, poor anti-interference

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