Source: http://www.google.com/patents/US7616187?dq=3798360
Timestamp: 2018-01-17 00:15:31
Document Index: 129904288

Matched Legal Cases: ['Application No. 10', 'art 50', 'art 50', 'art 50', 'art 50', 'art 60']

Patent US7616187 - Three-dimensional display device and method using hybrid position-tracking ... - Google Patents
A 3D display device and method using a hybrid position-tracking system is provided, along with a method for displaying the 3D image. The 3D display device includes a main body, a display, a camera, a first calculation part, a gyroscope, a second calculation part, and a Kalman filter. The display provides...http://www.google.com/patents/US7616187?utm_source=gb-gplus-sharePatent US7616187 - Three-dimensional display device and method using hybrid position-tracking system
Publication number US7616187 B2
Application number US 11/320,864
Also published as CN1845612A, CN1845612B, US20060227103
Publication number 11320864, 320864, US 7616187 B2, US 7616187B2, US-B2-7616187, US7616187 B2, US7616187B2
Inventors Jae-phil Koo, Dae-Sik Kim, Kyung-hoon Cha
US 7616187 B2
A 3D display device and method using a hybrid position-tracking system is provided, along with a method for displaying the 3D image. The 3D display device includes a main body, a display, a camera, a first calculation part, a gyroscope, a second calculation part, and a Kalman filter. The display provides a 3D image and the first calculation part calculates a relative posture change of the display with respect to a viewing position on the basis of the image photographed by the camera. The gyroscope is mounted in the main body to sense a change in an angular velocity of the display. The second calculation part calculates a relative posture change of the display and the Kalman filter receives the calculation results obtained by the first and second calculation parts to calculate a corrected-posture-change amount of the display.
17. The method for displaying the 3D image of claim 11, wherein the camera and the gyroscope are mounted in an inside or on an outside of the display.
This application claims priority from Korean Patent Application No. 10-2005-0029599, filed on Apr. 8, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
The present invention provides a 3D display device using a hybrid position-tracking system that adopts both a camera and a gyroscope so as to track a posture change of a mobile information terminal more accurately.
The first calculation part may measure an interval (D=f*d1/d2) using trigonometry on the basis of an interval d1 between two eyes of a user calculated by Bayesian Classifier, an interval d2 between two eyes of a user on the display calculated through calibration of the camera, and a focal length ‘f’ of the camera, and the first calculation part may calculate a rotation amount of the display with respect to a viewing position on the basis of a displacement of a user photographed by the camera and displayed on the display.
The gyroscope 40 is a kind of an inertia sensor and senses a posture change of the display 20 in X, Y, and Z-axis directions. For example, in the case where a viewer (USER 1) holds the main body 10 in his hand and rotates the main body to right and left around Y-axis, the gyroscope 40 can sense a displacement of the display 20 with respect to an X-axis direction. The first calculation part 50 calculates a relative posture change of the display 20 with respect to a viewing position on the basis of an image photographed by the camera 30. Referring to FIGS. 3 through 9, the first calculation part 50 receives an image of a user photographed by the camera 30 to detect information of a user's face. Also, the first calculation part 50 measures an interval (D=f*d1/d2) between the display 20 and a user using trigonometry on the basis of an interval (d1≈65 mm) between two eyes of a user calculated by Bayesian Classifier, an interval ‘d2’ between two eyes of a user on the display 20 calculated through calibration of the camera, and a focal length f of the camera. Therefore, the viewing region appropriate for a user's viewing distance can be formed by controlling a barrier interval of the display 20 according to a difference of the interval D.
Referring to FIGS. 10 and 11, when an image is displaced as much as values u, v, the first calculation part 50 detects a facial region and an eye of a user using an algorithm such as Bayesian Classifier to calculate an exact position of the u and the v. A rotation amount Φc (=α×u) of a camera and Φc (=β×v) can be obtained using a proportional expression by multiplying the calculated values u and v by proportional constants α and β obtained through an experiment, respectively. Here, a sampling period of the rotation amounts θc and Φc is about 12-30 Hz.
FIGS. 12A through 12C exemplarily illustrate the case where the main body 10 is rotated using a Z-axis for a rotational axis with respect to a fixed position of a user. At this point, a rotation amount Ωc (=γ×ω) of the camera can be obtained by measuring a rotation amount ω of a user's eye on the display 20. Here, γ is a proportional constant obtained by an experiment. In that case, a rotation amount Ωg for a Z-axis is measured by the gyroscope 40 and the second calculation part 60.
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U.S. Classification 345/156, 348/59, 348/51
Cooperative Classification G02B27/0093, H04N13/0472, H04N13/0477, G02B27/225, H04N13/0468, G09G3/003, G09G2340/145
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOO, JAE-PHIL;KIM, DAE-SIK;CHA, KYUNG-HOON;REEL/FRAME:017430/0717