Device for receiving photoelectricity white plate signal

A signal receiving device and whiteboard technology, applied in the direction of electrical digital data processing, instruments, data processing input/output process, etc., can solve problems such as pen operation and position calculation errors, signal reception interference, and affecting the normal use of products, etc.

Inactive Publication Date: 2008-07-30
鲍炜
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  • Abstract
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Problems solved by technology

[0004] However, since the above technologies need to use the same image sensor for coordinate calibration and light pen signal reception, the image sensor used must be able to receive visible light
When used in an interactive electronic whiteboard system for projection display, ambient visible light, especially strong projector light, will inevitably interfere with signal reception, resulting in errors in pen operation and position calculation
In practice, it is found that such interference often affects the normal use of the product

Method used

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  • Device for receiving photoelectricity white plate signal

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Embodiment Construction

[0011] The photoelectric whiteboard signal receiving device of this embodiment is as figure 1 As shown, the calibration camera (1) is an ordinary small-volume camera that can receive visible light images, and its lateral receiving angle is about 35 degrees. The light pen tracking camera (2) is also an ordinary camera, and its lateral receiving angle is also about 35 degrees. 35 degrees, a filter (5) is arranged outside the lens of the light pen tracking camera (2), which is a filter that absorbs infrared light through visible light, and the interface circuit (4) is used to connect the computer and the processing circuit (3), the calibration camera (1) and the light pen tracking camera (2) are all connected to the processing circuit (3), their positions are close to each other, pointing to the same direction so that the receiving range is the same as possible, the processing circuit (3) and The interface circuit (4) is connected. In the coordinate calibration stage, the comput...

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Abstract

The invention relates to a photoelectric whiteboard signal reception device used in a photoelectric whiteboard system to realize the automatic calibration of coordinates. The signal reception device comprises light-pen tracking cameras, a processing circuit and an interface circuit and further comprises a calibration camera for collecting images of a display screen and analyzing the coordinates of reference points. The light path of the light-pen tracking camera comprises an optical filter through which the infrared light or the ultraviolet light penetrates exclusively. The two cameras are faced to the same direction and both connected with the processing circuit. During the operation, a light-pen is used, which can emit the infrared light or the ultraviolet light relative to the optical filter. The photoelectric whiteboard system with the inventive photoelectric whiteboard signal receiver can automatically calibrate coordinates without the interference of visible lights.

Description

technical field [0001] The invention relates to a photoelectric whiteboard signal receiving device, in particular to a photoelectric whiteboard signal receiving device used in a photoelectric electronic whiteboard system capable of automatic coordinate calibration and using invisible light as a light source for a light pen, and belongs to the technical field of computer accessories. Background technique [0002] The applicant discloses a system and method for handwriting input in the Chinese invention patent whose patent number is ZL01108047.7. The principle is to use the light-emitting point of the light pen to indicate the target position, the camera in the signal receiver captures the image of the writing area and calculates the position of the light-emitting point through the processing circuit in the signal receiver, and then transmits the position data to the computer through the interface. The software further analyzes the signal and interacts with the computer operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 鲍炜
Owner 鲍炜
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