1. A communication system, comprising:
a control device that sets a forwarding path of a packet and determines processing rules corresponding to the forwarding path;
a forwarding node that includes a processing unit that processes a received packet by a processing rule transmitted from said control device, and a matching information processing unit that adds matching information, which represents information on processing for the received packet, to the received packet and forwards the received packet; and
a confirmation unit that confirms if said forwarding node and said control device are synchronized according to whether the matching information added to the received packet matches pre-calculated matching information.
2. The communication system as defined by claim 1, wherein
if the matching information is included in the received packet, said matching information processing unit uses the matching information and the information on processing for the received packet to generate matching information and adds the generated matching information to the received packet, and
whether said forwarding node and said control device are synchronized is confirmed according to whether the matching information added to the received packet matches pre-calculated matching information corresponding to the forwarding path.
3. The communication system as defined by claim 1, wherein
said control device notifies the pre-calculated matching information to a predetermined forwarding node among a plurality of forwarding nodes, and
said predetermined forwarding node confirms, using the notified matching information, if said forwarding node and said control device are synchronized.
4. The communication system as defined by claim 1, wherein
a predetermined forwarding node among a plurality of forwarding nodes transmits the matching information to said control device and
said control device confirms if said forwarding node and said control device are synchronized.
5. The communication system as defined by claim 1, further comprising a synchronization confirmation device that comprises said confirmation unit.
6. The communication system as defined by claim 1, wherein said forwarding node can generate the matching information.
7. The communication system as defined by claim 1, wherein
the matching information represents information related to at least one of a processing rule corresponding to the received packet, identification information on the forwarding node, and link information corresponding to the forwarding path.
8. A forwarding node, comprising:
a processing unit that processes a received packet by a processing rule transmitted from a control device;
a matching information processing unit that adds matching information, which represents information on processing for the received packet, to the received packet and forwards the received packet; and
a confirmation unit that confirms if said forwarding node and said control device are synchronized according to whether the matching information added to the received packet matches pre-calculated matching information.
9. The forwarding node as defined by claim 8, wherein
if the matching information is included in the received packet, said matching information processing unit uses the matching information and the information on processing for the received packet to generate matching information and adds the generated matching information to the received packet.
10. The forwarding node as defined by claim 8, wherein the matching information can be generated.
11. The forwarding node as defined by claim 8, wherein
the matching information represents information corresponding to at least one of a processing rule corresponding to the received packet, identification information on the forwarding node, and link information corresponding to the forwarding path.
12. The forwarding node as defined by claim 8, wherein the pre-calculated matching information is received from said control device.
13. A control device, comprising:
a unit that sets a forwarding path of a packet and forwards processing rules corresponding to the forwarding path to forwarding nodes that process the packet by the processing rules;
a receiving unit that receives matching information, which represents information on processing for a received packet, from a forwarding node that processes the received packet by the processing rule; and
a confirmation unit that confirms if said forwarding node and said control device are synchronized according to whether the matching information, received from the forwarding node, matches pre-calculated matching information.
14. A communication control method, comprising:
generating, by a forwarding node, matching information and adding the generated matching information to a received packet, the forwarding node performing packet processing according to a processing rule that is set by a control device, the matching information representing information on processing for the received packet; and
confirming if said forwarding node and said control device are synchronized according to whether the matching information added to the received packet matches pre-calculated matching information.
15. A non-transient computer-readable storage medium storing a program, that causes a computer, installed on a forwarding node that performs packet processing according to processing rules that are set by a control device, to execute processings of:
adding matching information to received packets, the matching information representing information on processing for the received packets; and
confirming if said forwarding node and said control device are synchronized according to whether the matching information added to the received packets match pre-calculated matching information.
16. The communication system as defined by claim 2, wherein
said control device notifies the pre-calculated matching information to a predetermined forwarding node among a plurality of forwarding nodes, and
said predetermined forwarding node confirms, using the notified matching information, if said forwarding node and said control device are synchronized.
17. The communication system as defined by claim 2, wherein
a predetermined forwarding node among a plurality of forwarding nodes transmits the matching information to said control device and
said control device confirms if said forwarding node and said control device are synchronized.
18. The communication system as defined by claim 1, further comprising a synchronization confirmation device that comprises said confirmation unit.
19. The forwarding node as defined by claim 9, wherein the matching information can be generated.
20. The forwarding node as defined by claim 9, wherein
the matching information represents information corresponding to at least one of a processing rule corresponding to the received packet, identification information on the forwarding node, and link information corresponding to the forwarding path.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A color-reproduction device for accurately achieving color reproduction with an image output device for displaying an image corresponding to an input signal value, said color reproduction device comprising:
bias-value storing means for storing a chromaticity value of offset light of the image output device and a chromaticity value of environment light which is incident on a display surface of the image output device; and
subtracting means for subtracting, from a chromaticity value corresponding to the input signal value, the chromaticity value of the offset light stored in the bias-value storing means and the chromaticity value of the environment light stored in the bias-value storing means.
2. The color reproduction device according to claim 1, wherein the chromaticity value of the offset light stored in the bias-value storing means is a chromaticity value which is obtained by sensing the display surface of the image output device with a chromaticity value detection sensor, while the image output device and the chromaticity value detection sensor are placed in a darkroom, and wherein a power supply of the image output device is turned on when the input signal value is zero.
3. The color reproduction device according to claim 2, wherein the chromaticity value detection sensor is adapted to measure spectrum data.
4. The color reproduction device according to claim 1, wherein the chromaticity value of the environment light stored in the bias-value storing means is a chromaticity value which is obtained by sensing the display surface of the image output device with a chromaticity value detection sensor, while illumination light is incident on the display surface of the image output device, and while a power supply of the image output device is turned off.
5. The color reproduction device according to claim 4, wherein the chromaticity value detection sensor is adapted to measure spectrum data.
6. The color reproduction device according to claim 1, wherein the input signal value is a chromaticity value obtained by adding the chromaticity value of the offset light and the chromaticity value of the environment light to an input value, and
wherein a bias value stored in the bias-value storing means is a chromaticity value which is obtained by sensing the display surface of the image output device with a chromaticity value detection sensor, while illumination light is incident on the display surface of the image output device, and wherein a power supply of the image output device is turned on when the input signal value is zero.
7. The color reproduction device according to claim 6, wherein the chromaticity value detection sensor detects the chromaticity value of the environment light stored in the bias-value storing means via an environment light detection adaptor which is attached to the chromaticity value detection sensor.
8. The color reproduction device according to claim 6, wherein:
the chromaticity value detection sensor detects the chromaticity value of the environment light stored in the bias-value storing means and the chromaticity value of the offset light stored in the bias-value storing means and is stored in a same casing;
an optical axis of an optical system in the casing is switched by a rotating mirror; and
the chromaticity value detection sensor detects the chromaticity value of the environment light via an environment detection adaptor.
9. The color reproduction device according to claim 6, wherein:
the chromaticity value detection sensor detects the chromaticity value of the offset light stored in the bias-value storing means;
another chromaticity value detection sensor for detecting the chromaticity value of the environment light stored in the bias-value storing means is provided in a same housing as the chromaticity value detection sensor for detecting the chromaticity value of the offset light stored in the bias-value storing means;
an optical system in the housing includes two optical axes reflected by a mirror; and
a direction from which the chromaticity value of the offset light is detected is opposite to a direction from which the chromaticity value of the environment light is detected.
10. The color reproduction device according to claim 6, wherein the chromaticity value detection sensor is adapted to measure spectrum data.
11. A color-reproduction device for accurately achieving color reproduction with an image output device for displaying an image corresponding to an input signal value, said color reproduction device comprising:
bias-value storing means for storing a chromaticity value of environment light which is incident on a display surface of the image output device; and
subtracting means for subtracting, from a chromaticity value corresponding to the input signal value, the chromaticity value of the environment light stored in the bias-value storing means.
12. The color reproduction device according to claim 11, wherein the chromaticity value of the environment light stored in the bias-value storing means is a chromaticity value which is obtained by sensing the display surface of the image output device with a chromaticity value detection sensor, while illumination light is incident on the display surface of the image output device, and while a power supply of the image output device is turned off.