Abstract: According to one aspect, a method for validating a vision system includes providing a vision testing medium at a first distance from the vision system, communicating a first information relating to the vision testing medium from the sensing apparatus to a first system, and displaying, using the first system, a rendering of the vision testing medium based on the first information. The method also includes obtaining, using the first system, at least a first indication of a visual acuity associated with the vision system, determining when the visual acuity at least meets a threshold level, and identifying the sensing apparatus as validated when the visual acuity at least meets the threshold level.

Abstract: According to one aspect, a method for validating a vision system includes providing a vision testing medium at a first distance from the vision system, communicating a first information relating to the vision testing medium from the sensing apparatus to a first system, and displaying, using the first system, a rendering of the vision testing medium based on the first information. The method also includes obtaining, using the first system, at least a first indication of a visual acuity associated with the vision system, determining when the visual acuity at least meets a threshold level, and identifying the sensing apparatus as validated when the visual acuity at least meets the threshold level.

Abstract: The invention relates to an assistant system for the tour guide, comprising a tour guide roll-call device, a plurality of labels for tourists and an intelligent mobile phone. The tourist guide roll-call device communicates with the labels tourists wearing via wireless network; the intelligent mobile phone communicates with the roll-call device via Bluetooth. After the tour guide roll-call device is respectively connected to the labels tourists wearing and the intelligent mobile phone, the intelligent mobile phone sends roll-call signal to the labels tourists wearing via the tour guide roll-call device. In setting area, the labels tourists wearing receive the roll-call signal and send feedback signal. The tour guide roll-call device receives the signal and sends it to the intelligent mobile phone. The intelligent mobile phone reads the signal to judge whether tourists are in place, and displays the roll-call result information on the screen.