Anyone who has tried to buy a movie ticket with a mobile phone knows that the experience of redeeming a movie ticket is not very friendly.
The user must look at the authentication code on the phone while using his finger to poke the huge input keyboard with great efficiency. However, if you use QR code to scan the code, sometimes the resolution time will be too long due to the resolution problem.
Imagine if you only use your phone to gently touch the screen, you can complete the information transfer. CapCam technology developed by Carnegie Mellon University team can achieve such a function. And this technology is resistant, far more than that.
CapCam technology quickly connects devices with a capacitive touchscreen (capaciTIve touchscreen) and (with multiple lenses) and transfers data between connected devices, and then you can:
1. Data transmission : Avoid entering private personal information in public, which is more convenient and convenient.
The process used by CapCam may be reminiscent of NFC technology - a radio technology based on short-range high-frequency, which can be connected without contact (without contact within 20 cm), behind payment functions such as Apple Pay The technical foundation. However, CapCam technology has little to do with NFC.
The CapCam name (Cap + Cam) has revealed the technical basis for its use—combining the capacitive tracking of the capaciTIve touchscreen with the ability of the camera to capture images. The specific connection process is as follows:
1. Prepare devices equipped with CapCam technology (temporarily, can be done by installing the app): a device with a capacitive touch screen (such as an iPad) and a device with a lens (such as a smartphone);
2. Put your smartphone on the iPad;
3. The iPad screen senses the unique signal generated by the smartphone body (Figure C);
4. CapCam technology captures the shape, location and other information of the mobile phone through the iPad screen (Figure D);
5. CapCam encrypts and converts pairing information (such as IP, port, information, password, etc.) into flash patches, which are displayed on the iPad screen below the smartphone (Figure E);
6. The smartphone's lens captures this color block information and uses it to establish a normal two-way wireless connection, and then free to transfer data (Figure F);
7. If the user wants to abort the connection, just pick up the phone from the screen.
The seemingly complicated process is actually 1.21 seconds from the time the app is opened to when the connection is completed. In the informal comparison experiment, the temporary speed is the fastest. The fastest connection followed by NFC took 1.3 seconds, while the more common Bluetooth connection took 4.8 seconds.
(Source:CapCam)
In addition to the fast pairing speed, CapCam requires that the device must make contact to establish a connection, and after the user terminates the contact, the device will be disconnected, more targeted, and the possibility of misconnection is reduced;
In the scenario where users need to enter private information in public places, it is safer to transmit information through CapCam than to cover the password with the palm of your hand.
At the same time, in the context of interactive games through the screen, supporting multiple devices to connect CapCam at the same time is more in line with the requirements of social games;
And most importantly, the two technology-based capacitive touch screens and lenses that CapCam relies on are very popular and can be used by almost everyone.
Program researcher Robert Xiao's hopes for CapCam technology are:
Nowadays, there are more and more large interactive screens like whiteboards. Usually, these screens are installed in public places, such as subways.
These screens can be very useful: they actually work well with smartphones to display information.
And our goal is to create a way to connect our smartphones to these devices quickly and easily. We want users to feel effortless without having to enter a password or scan a QR code.
This is also why this technology is now more focused on the speed of device pairing. As a result, CapCam's current data transfer speed is much slower than NFC: NFC can reach 424 Kbps, while CapCam is only 150 bps.
However, this speed can still be improved.
As you can imagine, in the future, touch screens will be everywhere. You can get important information about the neighborhood (through the connection).
Whether it is a map of a large shopping mall or an instant schedule at a bus stop, you can easily download it to your mobile phone with a light touch on your mobile phone.
Xiao added. In addition, from the application example of the research team (the interactive game above), CapCam, a technology that almost everyone has equipment, may be more popular with marketers. At the same time, in the mass education institutions such as museums or libraries, there are many extended use scenarios.
Currently, the team is seeking business partners to license technology and put them into commercial use.
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