| 摘要 |
A computer-based device 3 with a display screen optically transmits packets of data by modulating the graphics displayed in an area 4 on its screen. The data is transmitted by encoding different data values as different colours emitted by the area 4. The light radiated from the area 4 carries the data to another electronic device 2 such as a tag that contains a light sensor. When the light sensor is pointed towards the area 4 it is able to measure the light radiated by the area 4 and then extract the data packets from these measurements using techniques appropriate for the particular format of the transmission. The extracted data is then processed by the receiving device 2 and stored and/or used by the receiving device.
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