Method and device for automatic selection of electronic whiteboard image area based on image sensor

Abstract

The invention provides a method and a device for automatically selecting an electronic whiteboard image area based on an image sensor. The method comprises the following steps of: driving display equipment to display a first color in a way of being full of a screen, photographing a picture of a display plane, and saving the picture as a first picture; driving the display equipment to display a second color in the way of being full of the screen, photographing a picture of a display plane, and saving the picture as a second picture, wherein the second color and the first color are different in brightness; converting the first picture and the second picture into gray pictures, and respectively generating a first gray picture and a second gray picture; performing differential operation on the first gray picture and the second gray picture, so as to obtain a differential picture; and setting a pixel of which a pixel value is more than or equal to a preset threshold in the differential picture to be as a target pixel, and determining an area in which continuous target pixels exist as a target area. According to the method, the environmental background in the photographed picture of the image sensor can be removed, the image area of the display equipment is accurately determined, and the influence of light spots outside the image area on an electronic whiteboard is eliminated.

Description

technical field [0001] The invention relates to camera-based electronic whiteboard technology, in particular to a method and device for automatically selecting an image area of ​​an electronic whiteboard based on an image sensor. Background technique [0002] The electronic whiteboard based on the image sensor is a new touch technology, which transforms the traditional display device into an interactive display device with touch-like function. [0003] figure 1 It shows an electronic whiteboard based on an image sensor in the prior art, including: a projector 101, an image sensor 102, a projection plane 103, and a host 104, wherein the projector 101 projects the display screen sent by the host 104 on the projection plane 103 Above, the image sensor 102 shoots the projection plane 103, and transmits the display screen on the projection plane 103 and the shooting screen of the light pen light spot projected on the projection plane 103 to the host 104, and the host 104 extract...

AI Technical Summary

Problems solved by technology

In the complex environment background, if there are brighter light spots, it will seriously affect the manual positioning function and normal use of the light pen, and it is almost impossible to complete the automatic positioning function without removing the complex background.

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