| 摘要 |
<p>A method for transmitting data to a camera without requiring in the camera a conventional wireless transmission capability includes (a) in the camera's field of view, providing an object which forms an image on which the data is encoded; (b) capturing an image of the object using optics of the camera; and (c) recovering the data from the image of the object. The data is encoded by an optically detectable quantity (e.g., light intensity or color) or a pattern in one or more portions of the object. The data can be carried by the distribution of the optically detectable quantity within the image or its derivative. The field of view of the camera may be divided into multiple sub-areas to allow providing multiple data-bearing images. A sequence of such images may be used to increase the amount of data that can be transmitted in this manner. In addition, the time domain can be used to create one further dimension of data encoding. In addition, communication in the opposite direction may be provided using one or more lighting devices in the camera. One use is to provide a response (e.g., acknowledgement or non-acknowledgement to the data transmission based on the data recovered). The camera's response may be detected by one or more light detectors outside of the camera. Communication can be carried out using an interactive communication protocol. By providing multiple lighting devices in the camera and multiple light detectors in the outside, the system provides a parallel data bus, which may include a clock signal to govern timing on the bus. The data may be represented as quantized values.</p> |
