Smart home platform for hardware and software multi-touch

In recent years, multi-touch has become a new way to replace the traditional way of human-computer interaction. It abandoned the keyboard and mouse and realized the simultaneous interaction of many people. It is a revolutionary innovation in human-computer interaction. But unfortunately, the technology is still in its infancy, and many of Multi-Touch's products are only for high-end or military users, and the price is very high. This is unbearable for the vast number of consumers. In addition, the software industry based on Multi-Touch applications is currently quite small, and most of them stay in the function of game entertainment, which also limits the development and application of the technology.

For this reason, it is very urgent to apply the Multi-Touch technology to low-cost and market-oriented applications. Considering the new and efficient human-computer interaction of Multi-Touch, we apply it to the daily office life, and propose a Multi-Touch application solution for the office crowd to improve work efficiency and increase work pleasure.

Multi-touch smart home platform

First, a brief introduction to the FTIR principle

As the initial implementation of Multi-Touch, FTIR (Frustrated Total Internal Reflection) has been the most popular and the most thoroughly implemented method. The principle is to place an infrared LED on the side of the thick transparent plexiglass, so that the infrared light will totally reflect inside the glass. When a finger touches the surface of the plexiglass, the balance of total reflection will be broken, so there will be part of the light. Scattered below to be captured by the camera. Since the plexiglass is completely transparent, a layer of rear projection screen is attached to the upper or lower part of the plexiglass. On the whole, although the effect is good, this solution is too complicated because the lamp that is incident on the side is reasonably adjusted and the material requirements are also high.

Second, the DI principle is briefly described

The principle of DI was originally proposed by Microsoft, and its implementation principle is shown in Figure 2. In the figure, the plane touched by the user does not necessarily use plexiglass, but the key to the whole technology lies in the infrared scattering light source below the screen, which scatters the infrared light evenly on one side of the multi-touch screen. When the finger touches the surface, The finger blocks the way the light scatters upwards, and a shadow appears in the image. After further image processing, the position information about the finger can be extracted.

In terms of implementation, DI can be made simpler. Figure 1 shows the principle of Back DI (back projection light DI), which can be seen from the infrared light incident from below. The advantage of this Back DI is that the light source is under the touch screen, can be controlled by itself, and can properly control the brightness of the infrared light; it not only realizes shadow capture, but also realizes object recognition. However, this solution requires a reasonable placement of the infrared LEDs, and ensures that the brightness of all the infrared LEDs is almost the same, and the optimal uniform illumination effect is achieved, so the implementation is very difficult.

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