# US 2013/0157682 A1 · Method and system for location determination and navigation using textual information > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0157682 A1 - Document ID: US20130157682A1 - Status: Published application - Kind: A1 - Application number: 13/328,413 - Filed: 2011-12-16 - Published: 2013-06-20 - Earliest claimed: 2011-12-16 - Assignees: MaxLinear, Inc. - Inventors: Curtis Ling - Web page: https://patentgrep.com/patent/US20130157682A1 ## CPC - H04W 4/026: {using orientation information, e.g. compass} - G06F 16/22: Indexing; Data structures therefor; Storage structures - G06T 7/70: Determining position or orientation of objects or cameras (camera calibration G06T7/80) - G06V 30/224: of printed characters having additional code marks or containing code marks - H04W 4/02: Services making use of location information - H04W 4/023: {using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds} - H04W 64/00: Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management - H04W 4/024: Guidance services - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract Methods and systems for location determination and navigation using textual information may comprise capturing images of sources of textual information in the vicinity of a wireless communication device (WCD). Text may be extracted from the sources and a position of the WDC may be determined based on a comparison of the extracted text a stored database of textual information. An orientation of the text may be sensed and may be utilized with the extracted text and determined distances from the sources for the position determining. Locations of the sources and/or the captured images may be stored in the database. An instruction to capture images in a different orientation may be received when the positioning does not meet an accuracy requirement. A distance from the sources of textual information may be determined based on known optical properties of a camera in the WCD, such as focal length and/or and focus setting. ## Claims ### Claim 1 A method for wireless device positioning, the method comprising: in a wireless communication device: capturing one or more images of one or more sources of textual information in the vicinity of said wireless communication device; extracting text from said one or more sources of textual information; and determining a position of said wireless communication device based on a comparison of said extracted text in said captured one or more images to text in a stored database of textual information. ### Claim 2 (depends on 1) The method according to claim 1, comprising sensing an orientation of said text in said captured one or more images relative to said wireless device. ### Claim 3 (depends on 1) The method according to claim 1, comprising utilizing an orientation of said wireless device in conjunction with said extracted text for said position determining. ### Claim 4 (depends on 3) The method according to claim 3, comprising utilizing said orientation and said extracted text in conjunction with determined distances from said one or more sources of textual information for said position determining. ### Claim 5 (depends on 1) The method according to claim 1, comprising storing locations of said sources of textual information and/or said captured one or more images in said database of textual information. ### Claim 6 (depends on 1) The method according to claim 1, comprising receiving an instruction to capture one or more images in a different orientation when said positioning does not meet an accuracy requirement. ### Claim 7 (depends on 1) The method according to claim 1, comprising downloading and storing said database of textual information when GNSS signals sufficient for positioning are no longer received by said wireless communication device. ### Claim 8 (depends on 1) The method according to claim 1, comprising determining a distance from one or more of said sources of textual information in the vicinity of said wireless communication device based on known optical properties of a camera in said wireless communication device. ### Claim 9 (depends on 8) The method according to claim 8, wherein said optical properties comprises focal length and/or and focus setting. ### Claim 10 (depends on 8) The method according to claim 8, wherein said determined distance is used to determine an accurate location based on said captured one or more images. ### Claim 11 A system for wireless communication, the system comprising: one or more circuits for use in a wireless communication device, said one or more circuits being operable to: capture one or more images of one or more sources of textual information in the vicinity of said wireless communication device; extract text from said one or more sources of textual information; and determine a position of said wireless communication device based on a comparison of said extracted text in said captured one or more images to text in a stored database of textual information. ### Claim 12 (depends on 11) The system according to claim 11, wherein said one or more circuits are operable to sense an orientation of said text in said captured one or more images relative to said wireless device. ### Claim 13 (depends on 11) The system according to claim 11, wherein said one or more circuits are operable to utilize an orientation of said wireless device in conjunction with said extracted text for said position determining. ### Claim 14 (depends on 13) The system according to claim 13, wherein said one or more circuits are operable to utilize said orientation and said extracted text in conjunction with determined distances from said one or more sources of textual information for said position determining. ### Claim 15 (depends on 11) The system according to claim 11, wherein said one or more circuits are operable to store locations of said sources of textual information and/or said captured one or more images in said database of textual information. ### Claim 16 (depends on 11) The system according to claim 11, wherein said one or more circuits are operable to receive an instruction to capture one or more images in a different orientation when said positioning does not meet an accuracy requirement. ### Claim 17 (depends on 11) The system according to claim 11, wherein said one or more circuits are operable to download and store said database of textual information when GNSS signals sufficient for positioning are no longer received by said wireless communication device. ### Claim 18 (depends on 11) The system according to claim 11, wherein said one or more circuits are operable to determine a distance from one or more of said sources of textual information in the vicinity of said wireless communication device based on known optical properties of a camera in said wireless communication device. ### Claim 19 (depends on 18) The system according to claim 18, wherein said optical properties comprises focal length and/or and focus setting. ### Claim 20 (depends on 11) The system according to claim 11, wherein said stored database of textual information comprises a plurality of images of text. ### Claim 21 A system for location determination, the system comprising: one or more circuits for use in a wireless communication device, said one or more circuits being operable to: receive global positioning satellite (GPS) signals for determining a first position of said wireless communication device; capture one or more images of one or more sources of textual information in the vicinity of said wireless communication device; extract text from said one or more sources of textual information; and determine a second position of said wireless communication device based on a comparison of said extracted text in said captured one or more images to text in a stored database of textual information.