Image pick-up and display system, image pick-up device, image pick-up method, and computer readable storage device
An image pick-up and display system has a plurality of image pick-up devices and a display device. The image pick-up devices, other than a reference image pick-up device, have a control unit that performs the following: storing time relationship data indicating the time relationship between the image pick-up timing of the reference image pick-up device and the wireless transmission timing of compressed image data of the reference image pick-up device; adjusting the image pick-up timing of an image pick-up unit, on the basis of the time relationship data and the reception timing of the compressed image data that was wirelessly received by a first wireless communication unit, so as to match the image pick-up timing of the reference image pick-up device; and adjusting the wireless transmission timing of the first wireless communication unit so that the timing differs from the wireless transmission timing of the reference image pick-up device.
1. An image pick-up and display system comprising:
a plurality of image pick-up devices each of which executes image pick-up in a predetermined image pick-up cycle, and generates image pick-up data and wirelessly transmits compressed image data that corresponds to the image pick-up data each time image pick-up is performed; and
a display device which wirelessly receives the wirelessly transmitted compressed image data and displays an image based on the compressed image data,
wherein, when one of the plurality of image pick-up devices is defined as a benchmark image pick-up device, the benchmark image pick-up device has an image pick-up section which executes image pick-up in a predetermined image pick-up cycle, and generates and outputs the image pick-up data each time image pick-up is performed, a data processing section which generates the compressed image data from the image pick-up data output from the image pick-up section, and a first wireless communication section which wirelessly transmits the compressed image data generated by the data processing section in a predetermined transmission cycle,
wherein the image pick-up device other than the benchmark image pick-up device has the image pick-up section, the data processing section, the first wireless communication section which further wirelessly receives the compressed image data wirelessly transmitted from the benchmark image pick-up device, and a control section which stores temporal relation data that indicates a temporal relation between an image pick-up timing of the benchmark image pick-up device and a wireless transmission timing of the compressed image data of the benchmark image pick-up device, adjusts an image pick-up timing of the image pick-up section so that the timing matches the image pick-up timing of the benchmark image pick-up device and adjusts a wireless transmission timing of the first wireless communication section so that the timing is different from the wireless transmission timing of the benchmark image pick-up device based on the temporal relation data and a reception timing of the compressed image data wirelessly received by the first wireless communication section, and
wherein the display device has a second wireless communication section which wirelessly receives the compressed image data wirelessly transmitted from the image pick-up device, and a display section which displays an image based on the compressed image data wirelessly received by the second wireless communication section in a predetermined display cycle.
2. The image pick-up and display system according to claim 1 ,
wherein the first wireless communication section of the benchmark image pick-up device wirelessly receives, from the display device, reception completion data representing that the image pick-up data corresponding to one time of image pick-up has been wirelessly received by the display device,
wherein, when the reception completion data has been received by the first wireless communication section after the one time of image pick-up has been performed, the image pick-up section of the benchmark image pick-up device performs next image pick-up,
wherein the display device further has a computation section that computes an adjustment time of an image pick-up timing of the image pick-up section of the benchmark image pick-up device based on a display timing at which the image pick-up data corresponding to the one time of image pick-up of the image pick-up section of the benchmark image pick-up device is displayed by the display section and a reception timing of the image pick-up data wirelessly received by the second wireless communication section, and
wherein the second wireless communication section wirelessly transmits the reception completion data to the benchmark image pick-up device at a timing according to the computed adjustment time.
3. The image pick-up and display system according to claim 2 , wherein the second wireless communication section of the display device wirelessly transmits, to the benchmark image pick-up device, data representing successful reception of a wireless packet that has been finally wirelessly transmitted from the benchmark image pick-up device among wireless packets including divided image pick-up data obtained by dividing the image pick-up data corresponding to the one time of image pick-up of the image pick-up section of the benchmark image pick-up device into a plurality of pieces, as the reception completion data.
4. The image pick-up and display system according to claim 3 , wherein the second wireless communication section of the display device wirelessly transmits ACK data to the benchmark image pick-up device as the reception completion data.
5. The image pick-up and display system according to claim 4 , wherein, after successfully wirelessly receiving the wireless packet that has been finally wirelessly transmitted from the benchmark image pick-up device, the second wireless communication section of the display device wirelessly transmits NAC data to the benchmark image pick-up device each time the wireless packet re-transmitted from the benchmark image pick-up device is received until the ACK data is wirelessly transmitted.
6. The image pick-up and display system according to claim 1 ,
wherein the first wireless communication section of the image pick-up device other than the benchmark image pick-up device wirelessly transmits the image pick-up data to the benchmark image pick-up device,
wherein the benchmark image pick-up device further has an image combining section that combines the image pick-up data output from the image pick-up section and the image pick-up data wirelessly received by the first wireless communication section, and
wherein the first wireless communication section of the benchmark image pick-up device wirelessly receives the image pick-up data wirelessly transmitted from the image pick-up device other than the benchmark image pick-up device and wirelessly transmits the image pick-up data combined by the image combining section to the display device.
7. The image pick-up and display system according to claim 6 ,
wherein the image combining section of the benchmark image pick-up device combines the image pick-up data output from the image pick-up section and the image pick-up data wirelessly received by the first wireless communication section within the same period as the image pick-up cycle in which the former image pick-up data is generated.