Method and apparatus for providing remote access, control of remote systems and updating of display information

• US 6,522,334 B2
• Filed: 08/02/2001
• Issued: 02/18/2003
• Est. Priority Date: 04/28/1999
• Status: Expired due to Term

• Current Assignee: GetGo, Inc. (LogMeIn, Inc.)
• Original Assignee: Expertcity.Com, Inc.
• Inventors: Schauser, Klaus E.
• Primary Examiner(s): Chauhan, Ulka J.
• Application Number:
  US09/922,018
• Publication Number:
  US 20020000990A1
• Time in Patent Office: 565 Days
• Field of Search: 345/503, 345/537, 345/545, 345/556, 345/564
• US Class Current: 345/503
• CPC Class Codes: G06F 3/1462 with means for detecting differences between the image stored in the host and the images displayed on the remote displays
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/125 using unified memory architecture [UMA]
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel

Abstract

The present invention is a system and method for controlling information displayed on a first processor-based system, from a second processor-based system. The apparatus comprises a memory to store instruction sequences by which the second processor-based system is processed, and a processor coupled to the memory. The stored instruction sequences cause the processor to: (a) examine, at a predetermined interval, a location of a currently displayed image; (b) compare the location with a corresponding location of a previously displayed image to determine if the previously displayed image has changed; (c) transmitting location information representing the change; and (d) storing the changed information on the first processor-based system. Various embodiments are described.

Claims

1. Adapted to operate on instruction sequences, a processor to examine, at an interval, at least one pixel at a selected location of a currently displayed image by (a.1) determining a non-linear order of examination and (a.2) examining, at the interval, the at least one pixel at the selected location of the currently displayed image, and (b) comparing the selected location with a corresponding location of a previously displayed image to determine a change between the currently display image and the previously display image.

2. The processor of claim 1, wherein the instruction sequences further cause the processor to (c) transmit location information representing the change to a system remotely located from the processor.

3. The processor of claim 2, wherein the instruction sequences further cause the processor to (d) display changed information on the system remotely located from the processor.

4. The processor of claim 1, wherein the determining of the non-linear order of examination comprises:

listing each line i, where i=0 to N−

1, where N is a the total number of lines;

obtaining the binary representation of each line i;

reversing the binary representation of each line i;

determining an order of examination based on the reversed binary representation of each line i.

5. The processor of claim 1, wherein the determining of the non-linear order of examination comprises:

(a.1.i.) determining an initial order of examination commencing at line X, where X is an integer;

(a.1.ii.) determining a subsequent order of examination of at least portions of lines (X+K), where K is an integer, based on the initial order of examination.

6. The processor of claim 5, wherein if a previous examination process determines that the previously displayed image has not changed, the processor to repeat (a.1.i.) and (a.1.ii.) using a value of X that is different from that previously selected, and again compare new selected location with a corresponding location of the previously displayed image.

7. The processor of claim 1, wherein the determining of the non-linear order of examination comprises:

determining a list of most recently changed locations;

determining an order of examination based on the list.

8. The processor of claim 1, wherein the instruction sequences further cause the processor to further determine an extent of said change by examining a predetermined area surrounding said change and comparing said predetermined area with a previously stored image of said predetermined area.

9. The processor of claim 1, wherein the selected location is any one of a predetermined location, a statistically determined location or an arbitrarily determined location.

10. The processor of claim 1 being implemented within a computer so that the at least one pixel is a plurality of pixels proximate to a current position of a mouse associated with the computer.

11. A program stored in computer readable medium executed by internal circuitry within a system, the program comprising:

(a) a first application program to examine, at an interval, at least one pixel at a selected location of a currently displayed image by (a.1) determining a non-linear order of examination and (a.2) examining the at least one pixel at the selected location of the currently displayed image;

(b) determining a change between the currently displayed image and a previously displayed image; and

(c) a third application program to transmit location information representing the change to the second system.

12. The program of claim 11, wherein the second application program computes a checksum of the selected location and compares the checksum with a computed checksum of a corresponding location of the previously displayed image.

13. The program of claim 12, further comprising a fourth application program to display the information representing the change on the second system.

14. The program of claim 11, wherein the determining of the non-linear order of examination by the first application program comprises:

listing each line i, where i=0 to N−

1, where N is the total number of lines;

obtaining the binary representation of each line i;

reversing the binary representation of each line i;

determining an order of examination based on the reversed binary representation of each line i.

15. The program of claim 11, wherein the determining of the non-linear order of examination by the first application program comprises:

(a.1.i.) determining an initial order of examination X, where X is an integer;

(a.1.ii.)determining a subsequent order of examination (X+K), where K is an integer, based on the initial order of examination.

16. The program of claim 11, wherein the determining of the non-linear order of examination by the first application program comprises:

determining a list of most recently changed locations;

determining an order of examination based on the list.

17. The program of claim 11, further comprising a fourth application program to determine an extent of said change by examining a predetermined area surrounding said change and comparing said predetermined area with a previously stored image of said predetermined area.

18. The program of claim 17, further comprising a fifth application program to transmit location information representing said extent of said change and storing the extent of said information representing the change on the second system.

19. A method comprising:

determining an order of examination of selected pixels, comprises;

listing each line i, where i=0 to N−

1, where “

N”

is the total number of lines of the currently displayed image,

obtaining the binary representation of each line i of the currently displayed image,

reversing the binary representation of each line i of the currently displayed image, and

determining an order of examination based on the reversed binary representation of each line i of the currently displayed image;

examining the selected pixels of a subregion of an image currently displayed on a first system by a second system;

comparing the selected pixels with corresponding pixels of a portion of a previously displayed image to determine if the previously displayed image has been changed; and

transmitting information representing a change between the currently displayed image and the previously displayed image from the first system to the second system.

20. A method comprising:

determining an order of examination of selected pixels, comprises;

determining an initial order of examination of the image beginning at line X of the image, where “

X”

is an integer, and

determining a subsequent order of examination of the image continuing at line (X+AK), where “

K”

is a fixed integer and “

A”

is a variable integer;

examining the selected pixels of a subregion of an image currently displayed on a first system by a second system;

comparing the selected pixels with corresponding pixels of a portion of a previously displayed image to determine if the previously displayed image has been changed; and

transmitting information representing a change between the currently displayed image and the previously displayed image from the first system to the second system.

21. The method of claim 20, further comprising:

incrementing the variable integer A if no change between the currently displayed image and the previously displayed image.

22. The method of claim 20 wherein the selected pixels are a plurality of pixels proximate to a current position of a mouse.

23. The method of claim 20 wherein the selected pixels of the subregion form a portion of a line of the image.

24. The method of claim 20 wherein the selected pixels of the subregion form a tile of the image.