JPS6029145B2 - Real-time graphic transmission recognition method - Google Patents

Description

[Detailed Description of the Invention] As a line figure such as a character is drawn, the present invention recognizes what the figure is in real time, compresses and transmits information about the drawn line figure, and transmits it. This invention relates to a real-time graphic transmission recognition method for reproduction.

In an emergency alert/command system, it is necessary for the receiver to record handwritten letters or figures during voice communication with the caller, and to simultaneously convey the details of the communication to the dispatcher.

At this time, it is preferable that the communication pattern be conveyed not only in voice but also in the form of handwritten letters and figures from time to time in order to effectively convey the situation and provide materials for the dispatcher to make accurate decisions. Furthermore, emergency calls are often made over and over again for the same event, and the dispatcher needs to check whether they are for the same event before issuing a command. It is desirable to accumulate information about reported events through handwritten records so that they can be freely retrieved later if necessary, especially when the recipient of the report and the dispatcher are separated by distance. In some cases, it has been difficult to implement such a system. The purpose of this invention is to record handwritten characters and other line figures on a graphic input device.
The information on the drawn line figure is compressed and transmitted, and it is reproduced in the original shape of the line figure as necessary. At the same time, characters etc. handwritten on the figure input device are recognized and converted into codes. The object of the present invention is to provide a real-time graphic transmission recognition method.

Next, the present invention will be explained with reference to the drawings.

Referring to FIG. 1, one embodiment of a real-time character transmission recognition system according to the present invention is shown.

The graphic input device 10 is such that when a figure is drawn on the screen with a pen-like writing instrument, the pen position is observed at short intervals and the coordinates of the pen position are obtained as orthogonal coordinates x, Y. A y signal is obtained on the output line 12. Furthermore, a binary attachment/detachment signal is obtained on the line 13, which corresponds to "1" in the attached state when the Ben is placed on the screen, and "0" in the dismounted state in which it is released. The attachment/detachment signal will be represented by the symbol Z. Furthermore, in this specification, the numbers attached to a line and the numbers of signals passing through that line are used to distinguish each other. Such a graphic input device has a screen size of 25 x 25 arcs,
A system in which x and y signals each have 10 bits and a sampling interval of about 250 microseconds is used in practice, and the x and y signals are held unchanged for approximately 250 microseconds.

As such a graphic input device, for example, T. 0. Ellis and M. R. Patent publication for ``Digital computer and diagram input system'' invented by Depis (Patent application publication 1972-
7649). Graphic input device 10
Outputs 11, 12, and 13 are input to the graphic feature extraction device 20.

The figure feature extraction device 2 processes the input point sequence information sequentially, extracts the features of the handwritten figure, such as circular arc parts and straight line parts, distinguishes between circular arcs and straight lines, and coordinates of their end points. , curvature, the length of circular arcs and straight lines, and other information is output to the output line 200. The output of the output line 200 will be referred to as compressed graphic data. Graphic feature extraction device 2
0 calculates the moving distance of the bend tip and the tangential direction of the pen's advancing direction by successively comparing the point coordinate data input at short intervals, and then calculates the arc and straight line by examining the change in the tangential direction with respect to the unit moving distance. This device outputs divisions, end point coordinates, curvature, length, etc., and this type of figure feature extraction device is described in detail in the patent publication for “Real-time figure feature extraction device” (patent application publication 1986-14862). It is being

As the graphic feature extraction device 20, it is also possible to use one that approximates the input line figure using only broken lines.
This kind of device was called an "online figure identification device" (Showa 4).
It is described in detail as a line element extraction and storage device in Patent Application No. 46511 (Samurai Kosho 54-433) issued in 1996. The compressed graphic data is transferred to the changeover switch 30 and the storage control device 5.
0 and are added to the recognition device 70, respectively.

The selector switch 30 selects either input of the input line 200 or 500 and outputs a signal to the output line 300.
The signal on output line 300 is transmitted by a transmission device consisting of modem 35, transmission line 36, and modem 37. That is, the signal on the output line 300 is modulated by the modem 35, passed through the transmission line 36, demodulated by the modem 37, and applied to the display device 40. Modems 35 and 37 are preferably 1200 baud, but 200 baud is preferred for graphics at normal writing speeds.
It is also possible to use one with 00 baud. Display device 4
0 is a graphic display with a built-in linear-circular interpolator, which inputs data such as straight lines, arc divisions, end points, curvature, length, etc., and displays the line shape on the display screen so that it can be seen by humans. It is.

Linear and circular interpolators are described, for example, in "Computer Graphics" by Mamoru Hosaka, published by Sangyo Tosho Co., Ltd. (1971), p. 79-8. A storage tube type CRT display can be used as the display screen. If an xy recorder is used instead of a storage tube type CRT display, line figures can be directly recorded and displayed. Storage control device 50 is a small general-purpose computer.

The storage device 60 is a magnetic disk device, and these devices are coupled via a signal line 600. As the storage control device 50, for example, a computer NEAC manufactured by NEC Corporation is used.
3200/70 (trade name) is used, and a C-467 dish disk drive (trade name) manufactured by the same company can be used as the magnetic disk drive. The input compressed graphic data 200, that is, information on straight lines, sections of circular arcs, end points, curvatures, and lengths, is stored in the storage device 60 under the instructions of the storage control device 50.

When the need arises later, the compressed graphic data stored in the storage device 60 is read out under the control of the storage control device 50 and applied to the changeover switch 30 via the signal line 500. When the changeover switch 30 outputs the signal of the input line 200 to the output line 30, it outputs the raw data of the figure drawn on the figure input device 10 in real time, and when it outputs the signal of the input line 500 to the output line 300. The graphic data once accumulated is sent to the display device 40, respectively.

The recognition device 70 that receives the compressed graphic data 200 is a device that performs an identification function that analyzes the input line graphic information and associates it with a predetermined graphic category. An example of its configuration is described in detail in the patent publication ``Apparatus'' (Patent Application Publication No. 50-14501).

The recognition results are output in the form of character codes through an output line 7001, and can also be input and used into a general-purpose computer not shown in this figure. Incidentally, in the above explanation, there is one figure input device 10 and one figure feature extraction device 20, but
If there are a plurality of receiving locations (persons), they are arranged in correspondence with each receiving location. In this case, it is possible to transmit the output of each graphical feature extraction device 20 using a normal multiplex transmission means. The changeover switch 30, the storage control device 50, the storage device 60, and the recognition device 70 process the output signal of the modem 37, thereby making it possible to make the scale and economy of the system advantageous.

A simple explanatory diagram of the drawing is a block diagram showing an embodiment of a real-time character transmission recognition system according to the present invention.

In the figure, a graphic input device 10, a graphic feature extraction device 20
, a display device 40, a storage control device 50, a storage device 60, and a recognition device 70.

Claims (1)

[Claims] 1 A figure input device that detects and sequentially outputs the coordinates of the tip of a pen-like writing instrument within the screen as a handwritten figure is drawn, and a polygonal line or an arc and a polygonal line that take the output of the graphical input device as input and approximate the handwritten figure. a graphical feature extracting device that outputs a column, a transmitting device that transmits the output of the graphical feature extracting device to a remote location, and a display device that reproduces the shape of the handwritten graphic by inputting the signal transmitted by the transmitting device; A storage control device that receives the output of the graphic feature extraction device as an input, a storage device connected to the storage control device, and a recognition device that recognizes the handwritten figure using the output of the graphic feature extraction device as input, A real-time graphic transmission recognition system, characterized in that an output of the storage control device is connected as an input of the transmission device.