Electronic blackboard which detects an abnormal operating condit

Details Electronic blackboard which detects an abnormal operating condit Electronic blackboard which detects an abnormal operating condit

1985-11-27

1988-07-26

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358256, 358280, 358285, H04N 110, H04N 100, H04N 104, H04N 140

Patent

active

047604654

ABSTRACT:
An electronic blackboard includes a writing sheet which extends between a pair of rollers, partly wound therearound, a CCD image sensor for scanning the surface of the writing sheet which is illuminated by a lamp, and a control system including a central processing unit (CPU) for controlling its overall operation. Upon power up, the writing sheet is set in its initial position and the CCD image sensor scans along a non-image line outside of a writing surface of the writing sheet. The presence or absence of any abnormality condition is determined depending on the number of black level data found in the image data read by the CCD image sensor. That is, if the non-image line is defined in a white background area, the image data read by the CCD image sensor with the writing sheet set in its initial position should not include any black level image data other than those produced by noise. Thus, if the number of black level image data is found to be significant, there must be some abnormal condition. The writing sheet is divided into a plurality of pages which can be selectively positioned at a writing position in accordance with a detection hole associated with each page.

REFERENCES:
patent: 4287536 (1981-09-01), Wiggins
patent: 4587568 (1986-05-01), Takayama et al.
patent: 4667254 (1987-05-01), Araki et al.
patent: 4670794 (1987-06-01), Araki et al.
Torok, G. P., "Electronic Blackboard-Have Chalk Will Travel", 1977 International Conference on Communications, Jun. 12-15, 1977, Chicago, pp. 19.1-22-25.

Affiliated with

Also associated with

Rating

Electronic blackboard which detects an abnormal operating condit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic blackboard which detects an abnormal operating condit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic blackboard which detects an abnormal operating condit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-261245