Method and device for access to a digital image stored on a server computer

• US 8,230,103 B2
• Filed: 02/28/2005
• Issued: 07/24/2012
• Est. Priority Date: 03/08/2004
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Henry, Félix, Clare, Maryline
• Primary Examiner(s): Patel, Haresh N
• Assistant Examiner(s): SHAW, PETER C
• Application Number:
  US11/066,214
• Publication Number:
  US 20050196050A1
• Time in Patent Office: 2,703 Days
• Field of Search: 709/203, 709/229, 709/219, 709/232, 382/300, 382/232
• US Class Current: 709/232
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 21/6209 to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself

Abstract

A method of access by a client computer to a digital image stored on a server computer via a communication network, the digital image being represented by sets of digital data associated respectively with various blocks (Bi) and various resolution levels (Rj) of the image or with various blocks (Bi) and various quality levels (Qk) of the image, comprises a step (E47) of identifying a set of data to be acquired, a step (E48) of calculating the size in bits (b) of the set of data to be acquired, a step (E49) of comparing a number of acquired data bits (B) incremented by the calculated size (b) with a predetermined bit threshold value (S), and a step (E52) of acquiring the set of data identified if the number of data bits acquired incremented by the calculated size (B+b) is less than the predetermined bit threshold value (S).

Has particular use for limiting free access to a digital image.

Claims

1. A method of access by a client computer to a digital image stored on a server computer via a communication network, said digital image being represented by a plurality of sets of digital data associated respectively with various blocks and various resolution levels of the image or with various blocks and various quality levels of the image, the method performed by the client computer comprising the steps of:

obtaining from said server computer a predetermined threshold value indicating a total number of bits of a digital image for which the client computer is authorized to acquire, the authorization being for previewing the image;

acquiring from the server computer an initial set of digital data representing a portion of the digital image, the initial set of digital data being associated with at least one initial block and an initial resolution level or at least one initial block and an initial quality level;

displaying on the client computer the acquired initial set of digital data for the portion of the digital image;

displaying on the client computer a size in bits representative of the total number of acquired data bits for said digital image;

receiving an instruction input by a user to navigate in the displayed portion of the digital image;

determining whether the instruction to navigate requires an acquisition of another set of data to be acquired from said server computer amongst said sets of digital data representing the digital image;

calculating a size in bits of said set of data to be acquired in a case where the determining step determines that acquisition of the another set of data is required;

comparing the number of previously acquired data bits incremented by said calculated size with the predetermined threshold value;

acquiring said another set of data if said number of acquired data bits incremented by said calculated size is less than said predetermined threshold value; and

updating the size in bits representative of the total number of acquired data bits by adding the size of said another set of data acquired in the acquiring step, and updating the displayed size in bits representative of the total number of acquired data bits for said digital image,

wherein said determining step determines that the instruction to navigate requires an acquisition of another set of data to be acquired in a case where the instruction is for a greater resolution level, a greater quality level or a translation outside of the previously acquired blocks, and

wherein, when said determining step determines that the instruction to navigate does not require an acquisition of another set of data, the instruction to navigate is implemented and the displayed size in bits representative of the total number of acquired data bits for said digital image is not updated.

3. The method according to one of claim 1 or 2, wherein said threshold value of bits is predetermined according to a bit size of the sets of digital data associated with the digital image.

4. The method according to claim 3, wherein said threshold value is equal to a percentage of between 25% and 50% of the bit size of said sets of digital data associated with the digital image.

5. The method according to one of claim 1 or 2, wherein said comparing step is implemented on the client computer, and wherein said predetermined threshold value is stored on the client computer.

6. The method according to one of claim 1 or 2, further comprising a step of displaying a warning message on the client computer when the number of acquired data bits incremented by the calculated size is greater than said predetermined threshold value.

7. A computer comprising means for implementing the method according to one of claim 1 or 2.

8. A communication network comprising means for implementing the method according to one of claim 1 or 2.

9. A non-transitory computer-readable medium, which can be read by a microprocessor, comprising software code for implementing the method according to one of claim 1 or 2.

10. The method according to one of claim 1 or 2, wherein in said obtaining step, a file containing said predetermined threshold value is received by said client computer, and wherein said predetermined threshold value is associated with said digital image.

11. A method according to one of claim 1 or 2, wherein the steps of displaying, receiving, determining, calculating, comparing, acquiring and updating are reiterated if the updated size in bits representative of the total number of acquired data bits is less than the predetermined threshold, and wherein in the displaying step, the updated size in bits representative of the total number of acquired data bits is displayed.

2. A method of access by a client computer to a digital image stored on a server computer via a communication network, said digital image being represented by a plurality of sets of digital data associated respectively with at least two various blocks and various resolution levels of the image and various quality levels of the image, said method comprising the steps of:

obtaining from said server computer a predetermined threshold value indicating a total number of bits of a digital image for which the client computer is authorized to acquire, the authorization being for previewing the image;

acquiring from the server computer an initial set of digital data representing a portion of the digital image, the initial set of digital data being associated with at least one initial block and an initial resolution level or at least one initial block and an initial quality level;

displaying on the client computer the acquired initial set of digital data for the portion of the digital image;

displaying on the client computer a size in bits representative of the total number of acquired data bits for said digital image

receiving an instruction input by a user to navigate in the displayed portion of the digital image;

determining whether the instruction to navigate requires an acquisition of another set of data to be acquired from said server computer amongst said sets of digital data representing the digital image;

calculating a size in bits of said set of data to be acquired in a case where the determining step determines that acquisition of the another set of data is required;

comparing the number of previously acquired data bits incremented by said calculated size with the predetermined threshold value;

acquiring said another set of data if said number of acquired data bits incremented by said calculated size is less than said predetermined threshold value; and

updating the size in bits representative of the total number of acquired data bits by adding the size of said another set of data acquired in the acquiring step, and updating the displayed size in bits representative of the total number of acquired data bits for said digital image,

wherein said determining step determines that the instruction to navigate requires an acquisition of another set of data to be acquired in a case where the instruction is for a greater resolution level, a greater quality level or a translation outside of the previously acquired blocks, and

wherein, when said determining step determines that the instruction to navigate does not require an acquisition of another set of data, the instruction to navigate is implemented and the displayed size in bits representative of the total number of acquired data bits for said digital image is not updated.

12. A client device for accessing a digital image stored on a server computer via a communication network, said digital image being represented by a plurality of sets of digital data associated respectively with various blocks and various resolution levels of the image or with various blocks and various quality levels of the image, comprising:

at least one processor and memory;

obtaining means for obtaining from said server computer a predetermined threshold value indicating a total number of bits of a digital image for which the client device is authorized to acquire, the authorization being for previewing the image;

first acquiring means for acquiring from the server computer an initial set of digital data representing a portion of the digital image, the initial set of digital data being associated with at least one initial block and an initial resolution level or at least one initial block and an initial quality level;

first displaying means for displaying on the client device the acquired initial set of digital data for the portion of the digital image;

second displaying means for displaying on the client device a size in bits representative of the total number of acquired data bits for said digital image;

receiving means for receiving an instruction input by a user to navigate in the displayed portion of the digital image;

determining means for determining whether the instruction to navigate requires an acquisition of another set of data to be acquired from said server computer amongst said sets of digital data representing the digital image;

calculating means for calculating a size in bits of said set of data to be acquired in a case where the determining means determines that acquisition of the another set of data is required;

comparing means for comparing the number of previously acquired data bits incremented by said calculated size with the predetermined threshold value;

second acquiring means for acquiring said another set of data if said number of acquired data bits incremented by said calculated size is less than said predetermined threshold value; and

updating means for updating the size in bits representative of the total number of acquired data bits by adding the size of said another set of data acquired by the second acquiring means,

wherein said determining means determines that the instruction to navigate requires an acquisition of another set of data to be acquired in a case where the instruction is for a greater resolution level, a greater quality level or a translation outside of the previously acquired blocks, and

wherein, when said determining means determines that the instruction to navigate does not require an acquisition of another set of data, the instruction to navigate is implemented and the displayed size in bits representative of the total number of acquired data bits for said digital image is not updated.

14. The device according to one of claim 12 or 13, wherein the device is implemented into a client computer of the communication network.

13. A client device for accessing a digital image stored on a server computer via a communication network, said digital image being represented by a plurality of sets of digital data associated respectively with at least two various blocks and various resolution levels of the image and various quality levels of the image, comprising:

at least one processor and memory;

obtaining means for obtaining from said server computer a predetermined threshold value indicating a total number of bits of a digital image for which the client device is authorized to acquire, the authorization being for previewing the image;

first acquiring means for acquiring from the server computer an initial set of digital data representing a portion of the digital image, the initial set of digital data being associated with at least one initial block and an initial resolution level or at least one initial block and an initial quality level;

first displaying means for displaying on the client device the acquired initial set of digital data for the portion of the digital image;

second displaying means for displaying on the client device a size in bits representative of the total number of acquired data bits for said digital image;

receiving means for receiving an instruction input by a user to navigate in the displayed portion of the digital image;

determining means for determining whether the instruction to navigate requires an acquisition of another set of data to be acquired from said server computer amongst said sets of digital data representing the digital image;

calculating means for calculating a size in bits of said set of data to be acquired in a case where said determining means determines that acquisition of the another set of data is required;

comparing means for comparing a number of previously acquired data bits incremented by said calculated size with the predetermined threshold value;

second acquiring means for acquiring said another set of data if said number of acquired data bits incremented by said calculated size is less than said predetermined threshold value; and

updating means for updating the size in bits representative of the total number of acquired data bits by adding the size of said another set of data acquired by the second acquiring means,

wherein said determining means determines that the instruction to navigate requires an acquisition of another set of data to be acquired in a case where the instruction is for a greater resolution level, a greater quality level or a translation outside of the previously acquired blocks, and

wherein, when said determining means determines that the instruction to navigate does not require an acquisition of another set of data, the instruction to navigate is implemented and the displayed size in bits representative of the total number of acquired data bits for said digital image is not updated.

15. A method of access by a client computer to a digital image stored on a server computer via a communication network, said digital image being represented by a plurality of sets of digital data associated respectively with various blocks and various resolution levels of the image or with various blocks and various quality levels of the image, comprising the steps of:

obtaining from said server computer a predetermined threshold value indicating a total number of bits of a digital image for which the client computer is authorized to acquire, the authorization being for previewing the image;

acquiring from the server computer an initial set of digital data representing a portion of the digital image, the initial set of digital data being associated with at least one initial block and an initial resolution level or at least one initial block and an initial quality level;

displaying on the client computer the acquired initial set of digital data for the portion of the digital image;

displaying a size in bits representative of the total number of acquired data bits for said digital image;

receiving an instruction input by a user to navigate in the displayed portion of the digital image;

determining whether the instruction to navigate requires an acquisition of another set of data to be acquired from said server computer amongst said sets of digital data representing the digital image;

calculating a size in bits of said set of data to be acquired in a case where the determining step determines that acquisition of the another set of data is required;

comparing the number of previously acquired data bits incremented by said calculated size with the predetermined threshold value;

acquiring said another set of data if said number of acquired data bits incremented by said calculated size is less than said predetermined threshold value; and

updating the size in bits representative of the total number of acquired data bits by adding the size of said set of data acquired in the acquiring step, and updating the displayed size in bits representative of the total number of acquired data bits for said digital image; and

displaying a warning message on the client computer when the number of acquired data bit incremented by the calculated size is greater than the predetermined threshold value of bits,

wherein said determining step determines that the instruction to navigate requires an acquisition of another set of data to be acquired in a case where the instruction is for a greater resolution level, a greater quality level or a translation outside of the previously acquired blocks, and

wherein, when said determining step determines that the instruction to navigate does not require an acquisition of another set of data, the instruction to navigate is implemented and the displayed size in bits representative of the total number of acquired data bits for said digital image is not updated.

16. A method according to claim 15, wherein the warning message is a text message.

17. A method according to one of claim 15 or 16, wherein when the warning message is displayed, the step of displaying a size in bits representative of the number of acquired data bits is implemented, and the user is provided with an option to navigate in the image.

18. A method according to one of claim 15 or 16, wherein when the warning message is displayed, the user is provided with an option of paying a price and navigating in the entirety of the image.