Image generating apparatus, projector, and method for generating an image

• US 8,813,207 B2
• Filed: 03/07/2012
• Issued: 08/19/2014
• Est. Priority Date: 03/10/2011
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Ota, Koichiro, Iri, Kazuma
• Primary Examiner(s): Schwartz, Darren B
• Assistant Examiner(s): King, John B
• Application Number:
  US13/413,864
• Publication Number:
  US 20120233680A1
• Time in Patent Office: 895 Days
• Field of Search: 726 2- 10, 340/5.81, 713/150, 713155-157, 713176-178
• US Class Current: 726/10
• CPC Class Codes: G09C 5/00 Ciphering apparatus or methods not provided for in the preceding groups, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages
• CPC Class Codes: H04L 63/0823 using certificates cryptographic mechanisms or cryptographic arrangements for entity authentication involving certificates H04L9/3263
• CPC Class Codes: H04L 9/3263 involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements network architectures or network communication protocols for supporting authentication of entities using certificates in a packet data network H04L63/0823
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/835 Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10

Abstract

An image generating apparatus includes a timepiece determining section determining whether or not the setting of an internal clock is normal, a certificate determining section determining whether or not a received electronic certificate from a communication target apparatus is valid based on the setting of the internal clock, a communication section performing communication for authentication with the communication target apparatus if the certificate determining section determines that the received electronic certificate is valid and receiving image information from an image supplying apparatus belonging to a network to which the communication target apparatus belongs or the communication target apparatus, a control section making the communication section perform communication for authentication irrespective of whether or not the received electronic certificate is valid if the timepiece determining section determines that the setting of the internal clock is not normal, and an image generating section generating an image based on the image information.

Claims

1. An image generating apparatus comprising:

a timepiece determining section that determines whether or not the setting of an internal clock is normal;

a certificate determining section that determines, when the timepiece determining section determines that the setting of the internal clock is normal, whether or not a received electronic certificate from a communication target apparatus is valid based on the setting of the internal clock;

a communication section that performs communication for authentication with the communication target apparatus when the certificate determining section determines that the received electronic certificate is valid, and receives image information from an image supplying apparatus belonging to a network to which the communication target apparatus belongs or the communication target apparatus;

a control section that

instructs the communication section to perform communication for temporary authentication with the communication target apparatus, without updating the setting of the internal clock and determining whether the received electronic certificate is valid prior to performing the communication for temporary authentication, when the timepiece determining section determines that the setting of the internal clock is not normal, and

instructs the communication section to receive time information from a time information supplying apparatus belonging to a network to which the communication target apparatus belongs or the communication target apparatus, and update the setting of the internal clock based on the time information when the timepiece determining section determines that the setting of the internal clock is not normal and the control section determines that the temporary authentication is performed successfully; and

an image generating section that generates an image based on the image information.

2. The image generating apparatus according to claim 1, wherein after updating the setting of the internal clock, the control section instructs the certificate determining section to determine again whether or not the received electronic certificate is valid.

3. The image generating apparatus according to claim 2, wherein after updating the setting of the internal clock, the control section instructs the communication section to receive the received electronic certificate again before the certificate determining section determines again whether or not the received electronic certificate is valid.

4. The image generating apparatus according to claim 1, wherein if the timepiece determining section determines that the setting of the internal clock is not normal, the control section performs control to prohibit the communication section from performing communication with an apparatus other than the communication target apparatus.

5. The image generating apparatus according to claim 1, wherein

the internal clock is a timepiece which is driven by a secondary cell.

6. The image generating apparatus according to claim 1, wherein

if the control section determines that communication for authentication with the communication target apparatus based on the received electronic certificate is unsuccessfully performed, the control section ends the communication for authentication by making the communication section transmit, to the communication target apparatus, information indicating that authentication has been unsuccessfully performed.

7. A projector comprising:

a timepiece determining section that determines whether or not the setting of an internal clock is normal;

a certificate determining section that determines, when the timepiece determining section determines that the setting of the internal clock is normal, whether or not a received electronic certificate from a communication target apparatus is valid based on the setting of the internal clock;

a communication section that performs communication for authentication with the communication target apparatus when the certificate determining section determines that the received electronic certificate is valid, and receives image information from an image supplying apparatus belonging to a network to which the communication target apparatus belongs or the communication target apparatus;

a control section that

instructs the communication section to perform communication for temporary authentication with the communication target apparatus, without updating the setting of the internal clock and determining whether the received electronic certificate is valid prior to performing the communication for temporary authentication, when the timepiece determining section determines that the setting of the internal clock is not normal, and

instructs the communication section to receive time information from a time information supplying apparatus belonging to a network to which the communication target apparatus belongs or the communication target apparatus, and update the setting of the internal clock based on the time information when the timepiece determining section determines that the setting of the internal clock is not normal and the control section determines that the temporary authentication is performed successfully;

an image generating section that generates an image based on the image information; and

a projecting section that projects the image.

8. The projector according to claim 7, wherein after updating the setting of the internal clock, the control section instructs the certificate determining section to determine again whether or not the received electronic certificate is valid.

9. The projector according to claim 8, wherein after updating the setting of the internal clock, the control section instructs the communication section to receive the received electronic certificate again before the certificate determining section determines again whether or not the received electronic certificate is valid.

10. The projector according to claim 7, wherein

if the timepiece determining section determines that the setting of the internal clock is not normal, the control section performs control to prohibit the communication section from performing communication with an apparatus other than the communication target apparatus.

11. The projector according to claim 7, wherein

the internal clock is a timepiece which is driven by a secondary cell.

12. The projector according to claim 7, wherein

if the control section determines that communication for authentication with the communication target apparatus based on the received electronic certificate is unsuccessfully performed, the control section ends the communication for authentication by making the communication section transmit, to the communication target apparatus, information indicating that authentication has been unsuccessfully performed.

13. A method for generating an image comprising:

allowing an apparatus including an internal clock and a communication section to

determine whether or not the setting of the internal clock is normal,

determine, when the setting of the internal clock is determined to be normal, whether or not a received electronic certificate from a communication target apparatus is valid based on the setting of the internal clock,

when the setting of the internal clock is not normal, perform, by the communication section, communication for temporary authentication with the communication target apparatus, without updating the setting of the internal clock and determining whether the received electronic certificate is valid prior to performing communication for temporary authentication,

when the setting of the internal clock is not normal and the temporary authentication has been performed successfully, receive, by the communication section, time information from a time information supplying apparatus belonging to a network to which the communication target apparatus belongs or the communication target apparatus, and update the setting of the internal clock based on the time information,

when the received electronic certificate is valid, perform, by the communication section, communication for authentication with the communication target apparatus and receive image information from an image supplying apparatus belonging to a network to which the communication target apparatus belongs or the communication target apparatus, and

generate an image based on the image information.

14. The method for generating an image according to claim 13, wherein

the apparatus determines again whether or not the received electronic certificate is valid after updating the setting of the internal clock.

15. The method for generating an image according to claim 13, wherein after the setting of the internal clock is updated, a control section instructs the communication section to receive the received electronic certificate again before a certificate determining section determines again whether or not the received electronic certificate is valid.

16. The method for generating an image according to claim 13, wherein

if the apparatus determines that the setting of the internal clock is not normal, the apparatus prohibits the communication section from performing communication with an apparatus other than the communication target apparatus.

17. The method for generating an image according to claim 13, wherein if the apparatus determines that communication for authentication with the communication target apparatus based on the received electronic certificate is unsuccessfully performed, the apparatus instructs the communication section to transmit, to the communication target apparatus, information indicating that authentication has been unsuccessfully performed and ends the communication for authentication.