# US 7,744,218 B1 · Pupil position acquisition system, method therefor, and device containing computer software > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,744,218 B1 - Document ID: US7744218B1 - Status: Granted - Kind: B1 - Application number: 12/342,966 - Filed: 2008-12-23 - Published: 2010-06-17 - Granted: 2010-06-29 - Earliest claimed: 2008-12-12 - Assignees: Institute for Information Industry - Inventors: Chia-Te Chu; Jui-Tang Lin; Chin-Shun Hsu - Web page: https://patentgrep.com/patent/US7744218B1 ## CPC - G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A system and pupil position acquisition method and a device containing computer software for executing the same are provided. The system includes a shooting module, a scanning module, a signal transformation module, and a signal analysis module. The shooting module shoots an eyeball image using an image shooting device, such as a charge-coupled device (CCD) camera. The scanning module scans the eyeball image to acquire an eyeball signal. The signal transformation module performs a wavelet transform on the eyeball signal. The signal analysis module analyzes the eyeball signal after the wavelet transform to acquire a signal interval, and analyzes and acquires a position of a pupil with respect to the eyeball image according to the signal interval. ## Claims ### Claim 1 A pupil position acquisition system, comprising: a shooting module, for shooting an eyeball image; a scanning module, for scanning the eyeball image to acquire an eyeball signal; a signal transformation module, for performing a wavelet transform on the eyeball signal; and a signal analysis module, for analyzing the eyeball signal after the wavelet transform to acquire a signal interval, and analyzing and acquiring a position of a pupil with respect to the eyeball image according to the signal interval. ### Claim 2 (depends on 1) The pupil position acquisition system according to claim 1, wherein the shooting module is a Charge-coupled Device (CCD) camera. ### Claim 3 (depends on 1) The pupil position acquisition system according to claim 1, wherein the scanning module vertically scans the eyeball image to acquire the eyeball signal. ### Claim 4 (depends on 1) The pupil position acquisition system according to claim 1, wherein the scanning module horizontally scans the eyeball image to acquire the eyeball signal. ### Claim 5 (depends on 1) The pupil position acquisition system according to claim 1, wherein formulas of the wavelet transform to acquire the signal interval are: D=(s,H) A=(s,L), wherein s is the eyeball signal, H is a high frequency filter factor of the wavelet transform, D is a high frequency signal of the eyeball signal, the high frequency signal is a convolution result of the eyeball signal and the high frequency filter factor, L is a low frequency filter factor of the wavelet transform, A is a low frequency signal of the eyeball signal, and the low frequency signal is a convolution result of the eyeball signal and the low frequency filter factor. ### Claim 6 (depends on 5) The pupil position acquisition system according to claim 5, wherein the signal interval is a zero frequency, and the signal interval is analyzed and acquired according to a ratio of the high frequency signal crossing the zero frequency within a consecutive time. ### Claim 7 (depends on 5) The pupil position acquisition system according to claim 5, wherein the low frequency signal is a particular frequency in the signal interval, and the signal interval is analyzed and acquired according to a ratio of the low frequency signal crossing the particular frequency within a consecutive time. ### Claim 8 A pupil position acquisition method, comprising: acquiring an eyeball image; scanning the eyeball image to acquire an eyeball signal; performing a wavelet transform on the eyeball signal, and analyzing the eyeball signal after the wavelet transform to acquire a signal interval; and analyzing and acquiring a position of a pupil with respect to the eyeball image according to the signal interval. ### Claim 9 (depends on 8) The pupil position acquisition method according to claim 8, wherein the eyeball image is acquired by an image shooting device. ### Claim 10 (depends on 9) The pupil position acquisition method according to claim 9, wherein the image shooting device is a Charge-coupled Device (CCD) camera. ### Claim 11 (depends on 8) The pupil position acquisition method according to claim 8, wherein the eyeball signal is acquired by vertically scanning the eyeball image. ### Claim 12 (depends on 8) The pupil position acquisition method according to claim 8, wherein the eyeball signal is acquired by horizontally scanning the eyeball image. ### Claim 13 (depends on 8) The pupil position acquisition method according to claim 8, wherein formulas of the wavelet transform to acquire the signal interval are: D=(s,H) A=(s,L) wherein s is the eyeball signal, H is a high frequency filter factor of the wavelet transform, D is a high frequency signal of the eyeball signal, the high frequency signal is a convolution result of the eyeball signal and the high frequency filter factor, L is a low frequency filter factor of the wavelet transform, A is a low frequency signal of the eyeball signal, and the low frequency signal is a convolution result of the eyeball signal and the low frequency filter factor. ### Claim 14 (depends on 13) The pupil position acquisition method according to claim 13, wherein the signal interval is a zero frequency, and the signal interval is analyzed and acquired according to a ratio of the high frequency signal crossing the zero frequency within a consecutive time. ### Claim 15 (depends on 13) The pupil position acquisition method according to claim 13, wherein the low frequency signal is a particular frequency in the signal interval, and the signal interval is analyzed and acquired according to a ratio of the low frequency signal crossing the particular frequency within a consecutive time. ### Claim 16 A device containing computer software, applicable for performing a pupil position acquisition method through a computer software, wherein the pupil position acquisition method comprises: acquiring an eyeball image; scanning the eyeball image to acquire an eyeball signal; performing a wavelet transform on the eyeball signal, and analyzing the eyeball signal after the wavelet transform to acquire a signal interval; and analyzing and acquiring a position of a pupil with respect to the eyeball image according to the signal interval. ### Claim 17 (depends on 16) The device containing computer software according to claim 16, wherein the eyeball image is acquired by an image shooting device. ### Claim 18 (depends on 17) The device containing computer software according to claim 17, wherein the image shooting device is a Charge-coupled Device (CCD) camera. ### Claim 19 (depends on 17) The device containing computer software according to claim 17, wherein the eyeball signal is acquired by vertically scanning the eyeball image. ### Claim 20 (depends on 16) The device containing computer software according to claim 16, wherein the eyeball signal is acquired by horizontally scanning the eyeball image. ### Claim 21 (depends on 16) The device containing computer software according to claim 16, wherein formulas of the wavelet transform to acquire the signal interval are: D=(s,H) A=(s,L) wherein s is the eyeball signal, H is a high frequency filter factor of the wavelet transform, D is a high frequency signal of the eyeball signal, the high frequency signal is a convolution result of the eyeball signal and the high frequency filter factor, L is a low frequency filter factor of the wavelet transform, A is a low frequency signal of the eyeball signal, and the low frequency signal is a convolution result of the eyeball signal and the low frequency filter factor. ### Claim 22 (depends on 21) The device containing computer software according to claim 21, wherein the signal interval is a zero frequency, and the signal interval is analyzed and acquired according to a ratio of the high frequency signal crossing the zero frequency within a consecutive time. ### Claim 23 (depends on 21) The device containing computer software according to claim 21, wherein the low frequency signal is a particular frequency in the signal interval, and the signal interval is analyzed and acquired according to a ratio of the low frequency signal crossing the particular frequency within a consecutive time.