Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Reexamination Certificate
1999-01-29
2001-11-13
Brier, Jeffery (Department: 2672)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
C348S208400
Reexamination Certificate
active
06317114
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a method and apparatus for stabilization of an image, and more particularly to a video signal processing circuit and method used in performing vibration correction for an image on a display device.
2. Description of the Related Art
In recent years, electronic equipment including a display (e.g., such as a palmtop/laptop computer display, video games, televisions, display monitors, etc.) have become miniaturized and hence portable so that such equipment can be taken virtually anywhere and such equipment can be operated in virtually any environment including moving vehicles, boats, airplanes, etc.
In a moving vehicle such as an automobile, a disadvantage of viewing, for example, a laptop computer's display, such as for the IBM Thinkpad®, is the eye strain caused by vibrations and jitter of the vehicle. Further, the observer cannot easily follow the image during such vibration/jitter of the vehicle.
Additionally, there are certain human diseases which manifest themselves in tremors or palsy which induce movement in the device that make it nearly impossible for the handicapped user to view the display. Other devices that have the same disadvantage include Cathode Ray Tubes (CRT), Personal Digital Assistants (PDA), and Smart Cards.
It is noted that conventional recording system exist for correcting video camera vibrations. However, such a correction mechanism have been incorporated into image recording devices, and have not been found in image display devices and more particularly portable image display devices.
In a conventional system for motion compensation in a video recording device, the system identifies in the digitally recorded picture those elements with distinguishing characteristics. For example, objects with clean sharp edges and high contrast. Then, if those elements move, processing circuitry digitally shifts the picture to compensate for the motion.
However, this system fails to incorporate motion sensing devices (such as accelerometers) for motion compensation in a video display device or in an image other than one which is recorded. Hence, the device (e.g., video recorder) is aware of its coordinates, and extracts coordinates information from the recorded picture. Such a system is not applicable to a display undergoing physical/mechanical vibration and jitter.
Such a system for a video recording device is cannot be incorporated in a display device unless the display device is equipped with a fixed camera that can record the display device's motion and infer from the recorded image the displacement in two dimensions. Hitherto, the invention such a technique has not been performed in which motion is deduced directly for a display device being physically vibrated or moved. Additionally, such a system is very costly to manufacture.
SUMMARY OF THE INVENTION
In view of the foregoing and other problems of the conventional methods and structures, an object of the present invention is to provide a method and structure in which image vibration and jitter are compensated such that the user can readily observe the image on a display screen.
In a first aspect of the present invention, a motion compensating apparatus for a display device having a display screen, includes a device for sensing a movement of the display device, and a device for compensating for movement of the display device such that an image on the display screen of the display device remains substantially stationary in relation to an observers' gaze.
In a second aspect of the present invention, a method of compensating for motion of an image on a display device having a display screen, includes sensing a movement of the display device, and compensating for movement of the display device such that an image on the display screen of the display device remains substantially stationary in relation to an observers' gaze.
With the unique and unobvious features of the invention, a system is provided in which the mechanical vibration/jitter induced on the display device is sensed, and then the electronic image is shifted in the opposite direction to compensate for the vibration/jitter and to present a stable image to the observer's eye.
As a result, the viewed image stays stationary or near stationary relative to the observer, therefore reducing the user's eye strain.
Further, in contrast to the conventional system, the present invention is directed to motion compensation in a video display device, not in a video recording device, and incorporates motion sensing devices (accelerometers).
Additionally, unlike the conventional systems which identify in a digitally recorded picture those elements with distinguishing characteristics (e.g., objects with clean sharp edges and high contrast) and then if those elements move, processing circuitry digitally shifts the picture to compensate for the motion, the present invention is directed to an image being display as opposed to being recorded. As mentioned above, the conventional device such as a video camera, is aware of its coordinates, and extracts information from a recorded picture. In contrast, a display device does not record anything and hence is not aware of its positioning. The present invention brings this awareness into the display by measuring physical displacement in a plurality of axes (e.g., the horizontal axis and the vertical axis) of the display. The present invention deduces motion of the display device (and thus the displayed image) directly in an inexpensive and straightforward manner.
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Abali Bulent
Franke Hubertus
Giampapa Mark E.
Brier Jeffery
International Business Machines - Corporation
McGinn & Gibb PLLC
Yang Ryan
Zarick, Esq. Gail H.
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