Method for transmitting superimposed image data in a radio frequency communication system

• US 5,689,562 A
• Filed: 07/16/1996
• Issued: 11/18/1997
• Est. Priority Date: 07/16/1996
• Status: Expired due to Fees

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Hassan, Amer, Matthews, David G.
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/682,044
• Time in Patent Office: 490 Days
• Field of Search: 380/3, 380/4, 380/5, 380/6, 380/7, 380/8, 380/9, 380/10, 380/18, 380/20, 380/49, 380/50, 380/54, 380/59, 352/81, 352/97, 348/22, 348/23, 348/24, 348/25
• US Class Current: 382/236
• CPC Class Codes: H04N 1/4172 Progressive encoding, i.e. by decomposition into high and low resolution components
• CPC Class Codes: H04N 19/30 using hierarchical techniques, e.g. scalability H04N19/63 takes precedence

Abstract

The present invention relates to a method for transmitting image data for superimposed images via wireless devices in a radio frequency communication system. The original image is transmitted via a communication channel to a receiving unit. The original image is then revised to form a revised image. The revised image is compared to the original image to determine the differences between the revised image and the original image. These differences comprise a difference image which is then transmitted to the receiving party. At the receiving end, the difference image is recombined with the previously-transmitted original image to reform the revised image. In a preferred embodiment, the original images and difference images are preferably decomposed and progressively transmitted to the receiving unit in response to image data requests from the receiving unit.

Claims

1. A method for transmitting superimposed image data via wireless devices in a radio frequency communication system, comprising the steps of:

a) storing an original image in an image transmitting unit;

b) transmitting the original image from the image transmitting unit to an image receiving unit;

c) storing the original image in the image receiving unit;

d) revising the original image in the image transmitting unit to form a revised image;

e) storing the revised image in the image transmitting unit;

f) comparing and determining the differences between the revised image and the original image;

g) forming a difference image comprising the differences between the revised image and the original image;

h) transmitting the difference image to the image receiving unit;

i) adding the difference image to the original image to recreate the revised image at the image receiving unit; and

j) storing the revised image in the image receiving unit.

2. The method according to claim 1 wherein the original image and subsequent revised images are stored in a working image memory in the image transmitting unit.

3. The method according to claim 2 further including the step of transferring the last image in the working image memory to a comparison image memory in the image transmitting unit when a subsequent revised image is stored in the working image memory.

4. The method according to claim 3 wherein an image processor in the image transmitting unit compares the image in the working image memory with the image in the comparison image memory and determines the differences between the images to form a difference image.

5. The method according to claim 1 wherein the original image and subsequent revised images are stored in a whole image memory in the image receiving unit.

6. The method according to claim 5 wherein the difference image is stored in a partial image memory in the image receiving unit.

7. The method according to claim 6 wherein an image processor in the image receiving unit recombines the image in the whole image memory with the image in the partial image memory to recreate the revised image.

8. The method according to claim 7 wherein the revised image is stored in the whole image memory of the image receiving unit.

9. The method of claim 8 wherein the image in the whole image memory is displayed at the image receiving unit.

10. The method of claim 1 wherein the step of transmitting the original image comprises decomposing the original image into a base image and one or more image details;

storing the decomposed original image in an image transmitting unit;

transmitting the base image from an image transmitting unit to an image receiving unit;

receiving one or more additional data requests from the image receiving unit; and

transmitting additional image details from the image transmitting unit to the image receiving unit in response to the additional image data requests.

11. The method according to claim 10 wherein the step of transmitting additional image data requests comprises sending a multiple image data request for multiple image details.

12. The method according to claim 11 wherein the step of transmitting additional image details includes transmitting multiple image details in response to a multiple image data request.

13. The method according to claim 12 wherein the step of transmitting multiple image details includes combining the multiple image details prior to transmission to the image receiving unit.

14. The method according to claim 12 wherein the step of transmitting multiple image details includes transmitting the image details in a string of discrete information blocks.

15. The method according to claim 10 including the step of storing, at the image transmitting unit, a count of the total number of image details transmitted to the image receiving unit.

16. The method according to claim 15 wherein the step of transmitting the additional image details includes determining the total number of image details previously transmitted to the image receiving unit, transmitting the next image details, and incrementing the total count.

17. A method for transmitting a superimposed image between an image transmitting unit and an image receiving unit, comprising the steps of:

a) decomposing an original image into discrete information blocks including a base image information block and one or more image detail information blocks;

b) storing the information blocks in the image transmitting unit;

c) sending a first image data request from an image receiving unit to the image transmitting unit;

d) transmitting an information block containing the base image from the image transmitting unit to the image receiving unit in response to the first image data request;

e) displaying the base image at the image receiving unit;

f) sending one or more additional image data requests from the image receiving unit to the image transmitting unit;

g) transmitting additional information blocks containing image details from the image transmitting unit to the image receiving unit in response to the additional image data requests;

h) combining, at the image receiving unit, the image details with the base image and any previous image details received by the image receiving unit to create a new detail image of higher resolution than the previous image;

i) displaying the new detail image at the image receiving unit;

j) revising the original image at the image transmitting unit to form a revised image;

k) comparing the revised image to the original image and extracting the differences between the images to form a difference image;

l) transmitting the difference image from the image transmitting unit to the image receiving unit;

m) recombining the original image with the difference image at the image receiving unit to reform the revised image; and

n) displaying the revised image at the image receiving unit.

18. The method according to claim 17 wherein the original image and subsequent revised images are stored in a working image memory in the image transmitting unit.

19. The method according to claim 18 further including the step of transferring the last image in the working image memory to a comparison image memory in the image transmitting unit when a subsequent revised image is stored in the working image memory.

20. The method according to claim 19 wherein an image processor in the image transmitting unit compares the image in the working image memory with the image in the comparison image memory and determines the differences between the images to form a difference image.

21. The method according to claim 17 wherein the original image is stored in a whole image memory of the image receiving unit.

22. The method according to claim 21 wherein subsequent difference images are stored in a partial image memory of the image receiving unit.

23. The method according to claim 22 wherein an image processor in the image receiving unit combines the difference image in the partial image memory with the previous iteration of the image in the whole image memory to create a new, revised image and stores the new, revised image in the whole image memory.

24. The method according to claim 23 wherein the revised image is displayed at the image receiving unit.

25. The method according to claim 17 wherein the step of transmitting additional image data requests comprises sending a multiple image data request for multiple image details.

26. The method according to claim 25 wherein the step of transmitting additional image details includes transmitting multiple image details in response to a multiple image data request.

27. The method according to claim 26 wherein the step of transmitting multiple image details includes combining the multiple image details prior to transmission to the image receiving unit.

28. The method according to claim 27 wherein the step of transmitting multiple image details includes transmitting the image details in a string of discrete information blocks.

29. The method according to claim 17 including the step of storing, at the image transmitting unit, a count of the total number of image details transmitted to the image receiving unit.

30. The method according to claim 29 wherein the step of transmitting the additional image details includes determining the total number of image details previously transmitted to the image receiving unit, transmitting the next image details, and incrementing the total count.

31. A superimposed image data transmission system, comprising:

a) an image transmitting unit having a memory for storing an original image and a subsequent revision of the original image;

b) an image processing means in the image transmitting unit for comparing the original image with the revised image and forming a difference image comprising the differences between the revised image and the original image;

c) an image receiving unit including an image display;

d) a communication means linking the image transmitting unit with the image receiving unit for transmitting the original image and the difference images to the image receiving unit; and

e) image processing means in the image receiving unit for combining the difference image with original image to reform the revised image.

32. The superimposed image data transmission system of claim 31 further including an image decomposition unit in the image transmitting unit for decomposing images prior to transmission to the image receiving unit.

33. The superimposed image data transmission system of claim 32 wherein the image receiving unit includes means for recombining images which are decomposed prior to transmission.

34. A multiresolution transmission system for superimposed image data, comprising:

a) an image transmitting unit having memory for storing an original image and a subsequent revised image;

b) an image comparison means in the image transmitting unit for comparing the original image with the subsequent revised image and creating a difference image comprising the differences between the original image and the revised image;

c) an image transmitting unit having memory for storing a decomposed image in information blocks;

d) an image decomposition means for decomposing an image into a base image and one or more image details which are sequentially combined with the base image to create details images of increasingly higher resolution;

e) an image receiving unit including an image display;

f) communication means linking the image transmitting unit with the image receiving unit;

g) request means for sending image data requests from the image receiving unit to the image transmitting unit, with the image transmitting unit being responsive to the image data requests to send image data to the image receiving unit in discrete units beginning with the base image and progressing incrementally through the image details until the last image detail as reached;

h) an image processing means in the image receiving unit for combining the base image with the image details to create detail images of increasingly higher resolution with the addition of each image detail;

i) a reset means in the image receiving unit for terminating an image transmission sequence and notifying the image transmitting unit of a ready status for receiving another image; and

j) an image processing means in the image receiving unit for combining the difference image with original image to recreate the revised image.