# US 7,746,401 B2 · Method for adjusting image display range of a document camera > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,746,401 B2 - Document ID: US7746401B2 - Status: Granted - Kind: B2 - Application number: 11/425,184 - Filed: 2006-06-20 - Published: 2006-12-21 - Granted: 2010-06-29 - Earliest claimed: 2005-06-21 - Assignees: Avermedia Information, Inc. - Inventors: Jiun-Shin Wu; Jung-Yu Chen; Yung-Hsi Wu; Po-Chih Hung - Web page: https://patentgrep.com/patent/US7746401B2 ## CPC - G03B 17/54: with projector - G09G 5/39: Control of the bit-mapped memory - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract A method is used with a document camera and an image display device for adjusting the image display range. The document camera includes an image synthesis controller and a graphics buffer. In the method, a first image frame and a second image frame are received by the image synthesis controller. In response to the image parallel display information, the graphics buffer is divided into a first region and a second region, and the image synthesis controller fills partial data of the first image frame and second image frame into the first region and the second region, respectively. In response to a change of the image parallel display information made by the user, the graphics buffer is divided into a third region and a fourth region, and the image synthesis controller fills partial data of the first image frame and second image frame into the third region and the fourth region, respectively. The data filled in the graphics buffer is then outputted to the image display device as a synthesized frame to be displayed. ## Claims ### Claim 1 A method for adjusting an image displaying range of a document camera on an image display device, said method comprising steps of: providing a frame buffer; receiving a first image frame defined by a first image data and a second image frame defined by a second image data; executing an image parallel-displaying function to divide said frame buffer into a first area and a second area where a first portion of said first image data and a first portion of said second image data are loaded, respectively, so as to show a first synthesis image frame having a size equal to the size of said frame buffer and consisting of a first part of said first image frame and a first part of said second image frame with a first-position partition line therebetween; and executing another image parallel-displaying function to divide said frame buffer into a third area and a fourth area where a second portion of said first image data and a second portion of said second image data are loaded, respectively, so as to show a second synthesis image frame having a size equal to the size of said frame buffer and consisting of a second part of said first image frame and a second part of said second image frame with a second-position partition line therebetween; wherein with the movement of a partition line from said first-position partition line to said second-position partition line, image data within a range defined between said first-position partition line and said second-position partition line are changed while image data beyond said range are kept unchanged. ### Claim 2 (depends on 1) A method according to claim 1 wherein said first image data is obtained while said document camera is sensing an image of an object being presented. ### Claim 3 (depends on 1) A method according to claim 1 wherein said second image data is previously stored as an image file in said document camera. ### Claim 4 (depends on 3) A method according to claim 3 wherein said image file is obtained by capturing or scanning an image of an object by said document camera. ### Claim 5 (depends on 1) A method according to claim 1 wherein said first area and said second area have the same size. ### Claim 6 (depends on 1) A method according to claim 1, further comprising a step of executing an electric panning operation to load a third portion of said first image data into said first area so as to show a third synthesis image frame having a size equal to the size of said frame buffer and consisting of a third part of said first image frame and said first part of said second image frame with said first-position partition line therebetween. ### Claim 7 (depends on 1) A method according to claim 1 wherein said first-position partition line is disposed exactly at the middle of said first synthesis image frame, and said second-position partition line is disposed right or left from the first-position partition line. ### Claim 8 (depends on 1) A method according to claim 1, further comprising a step of executing an electric panning operation to load a fourth portion of said first image data into said third area so as to show a fourth synthesis image frame having a size equal to the size of said frame buffer and consisting of a fourth part of said first image frame and said second part of said second image frame with said second-position partition line therebetween. ### Claim 9 (depends on 1) A method according to claim 1 wherein said image displaying device is a display or a digital projector coupled with a project screen.