JPH0410117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a graphic data reading device for reading two-dimensional graphic data using a reader incorporating a one-dimensional image sensor, and in particular for enlarging or reducing the read graphic data to an arbitrary scale. The present invention relates to a graphic data reading device capable of reading data.

For example, as shown in FIG. 1, by moving a hand scanner 3, which is a reader configured to be operated by hand, over a document 2 on which graphic data 1 such as characters and marks are drawn, the graphic data can be read. There is a reading device. In this case, the hand scanner 3 has a built-in one-dimensional image sensor,
By moving the sensor over the document 2 in a direction X orthogonal to the scanning direction Y, it is possible to read two-dimensional XY graphic data. At this time, since the hand scanner 3 is manually operated, its moving speed is not necessarily constant, but rather varies greatly.

Therefore, in the past, a reading device that generated sampling pulses commensurate with the scanning speed and thereby made it possible to read characters accurately was developed.
68131, and Japanese Patent Application Laid-Open No. 1983-33772, a document is moved in a direction X orthogonal to a built-in one-dimensional image sensor in the scanning direction Y, and
A reader that reads Y2-dimensional figure data, a movement pulse generator that outputs a movement pulse every time this reader is moved a certain distance in the X direction, and a manual reader that receives this movement pulse and reads the figure data. Are listed.

In other words, in the former method, the scanning speed in a certain section is memorized, and the sampling pulse generation period in the continuous character section is determined from the memorized scanning speed, so that sampling is always performed at a fixed position. is configured to do so. However, since this determines the current scanning speed based on past data,
When the moving speed of the reader suddenly changes, there are problems in that it is not possible to follow the change, and it is not possible to arbitrarily enlarge or reduce the read data.

In addition, although the latter method measures the scanning period using a rotary encoder and changes the sampling interval for reading graphic data, it has the problem that the read data cannot be enlarged or reduced arbitrarily. .

This invention was made in view of the above problems, and its purpose is to enable the sampling interval of read data to be arbitrarily variably set, thereby making it possible to arbitrarily change the read image in an analog manner. The object of the present invention is to provide a graphic data reading device that can enlarge and reduce the graphic data.

Embodiments of the present invention will be described in detail below with reference to FIG.

The device shown in the figure moves over a document 2 in a direction
It has a manual scanning reader, ie, a hand scanner 3, for reading.

The hand scanner 3 also includes a movement pulse generator 5 that outputs a movement pulse P1 every time the hand scanner 3 is moved a certain distance in the X direction. Furthermore, a data processing circuit is provided that samples the read data D ₀ output from the hand scanner 3 based on the movement pulse P1.

Here, the feature of the present invention is that first, an analog signal having an analog amount corresponding to the period T1 of the movement pulse P1 is generated, and a change in the period of the movement pulse P1 is detected. A period detection circuit 8 that calculates the moving speed of the reader 3 in real time, and a period detection circuit 8 that oscillates at a period T2 corresponding to the analog output value of this period detection circuit 8, and a movement of the reader 3 detected by the period detection circuit 8. It has a timing signal output circuit 9 that outputs a sampling timing signal according to the speed.

Then, the timing signal output from the timing signal output circuit 9 is transmitted to the data processing circuit 6.
It is configured to read the graphic data 1 in response to this sampling timing signal.

Therefore, according to such a configuration, the moving speed of the reader 3 is detected in real time according to the movement of the reader 3, a sampling timing signal is output according to the detected moving speed, and this timing is Since the graphic data 1 is read in accordance with the signal, even if the moving speed of the reader 3 changes rapidly, the graphic data can always be read at an appropriate timing according to the change.

Note that 10 in the figure is an analog adjustment circuit that continuously changes the human output characteristics of at least one of the period detection circuit 8 and the timing signal output circuit 9.
This analog adjustment circuit 10 is not necessarily an essential requirement in the present invention. In this embodiment, the period detection circuit 8 has a conversion characteristic that generates an analog voltage V1 that increases proportionally as the reciprocal 1/T1 of the period T1 of the moving pulse P1 increases. That is, a type of frequency/voltage converter (F/V converter) is used. Furthermore, as the timing signal output circuit 9, a so-called voltage-controlled variable cycle number oscillator circuit (VCO) is used. It has a conversion characteristic such that as the control input voltage increases, the reciprocal 1/T2 of the oscillation period T2 increases. The above analog adjustment circuit 10
is formed by a potentiometer (variable resistor) interposed between the output side of the detection circuit 8 and the input side of the oscillation circuit 9.

Here are some of the other examples:
The moving pulse generator 5 generally has a configuration in which a pulse encoder is connected to a roller that rotates in contact with the document 2 being moved by the hand scanner 3. A sensor for reading this mark may be provided on the hand scanner 3 side, and a detection pulse for each mark may be output as the movement pulse while the hand scanner 3 is moved. Further, the period detection circuit 8 may be of a type that outputs an analog voltage proportional to the period T1 of the input pulse P1. In this case, the timing signal output circuit 9 is configured to generate a pulse P2 having a period T2 proportional to its analog output voltage.

As described above, the present invention includes a movement pulse generator that outputs a movement pulse every time the reader is moved a certain distance in the X direction, and a period of the movement pulse output from the movement pulse generator. a period detection circuit that outputs a voltage according to the detected period; an analog adjustment circuit that adjusts the voltage output from the period detection circuit to a desired voltage value by multiplying it by an arbitrary constant; A timing signal output circuit that outputs a sampling timing signal with a period corresponding to the output voltage from the circuit is provided, and the configuration is such that the graphic data is read in response to the sampling timing signal output from the timing signal output circuit. With a simple configuration and operation, the sampling interval of read data can be arbitrarily variably set in an analog manner, thereby providing a graphic data reading device that can arbitrarily enlarge or reduce the read image. It has this effect.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a reader portion of a graphic data reading device, and FIG. 2 is a block circuit diagram showing an embodiment of the graphic data reading device according to the present invention. 1...Graphic data such as characters and marks, 2...Manuscript, 3...Hand scanner (reader), 4...1
Dimensional image sensor, 5... moving pulse generator,
6...Data processing circuit, 8...Period detection circuit, 9
...Timing signal output circuit, 10...Analog adjustment circuit, _D0 ...Graphic reading data, P1...Moving pulse, P2...Sampling pulse, V1
...Analog output voltage.

Claims (1)

[Scope of Claims] 1. A reader that is moved over a document in a direction X orthogonal to the operating direction Y of a built-in one-dimensional image sensor and reads two-dimensional graphical data of X and Y, and the reader is fixed in the X direction. a movement pulse generator that outputs a movement pulse every time the movement pulse generator is moved; and a period detection circuit that detects the period of the movement pulse output from the movement pulse generator and outputs a voltage according to the detected period. , an analog adjustment circuit that adjusts the voltage value output from the period detection circuit to a desired voltage value by multiplying it by an arbitrary constant; and an analog adjustment circuit that outputs a sampling timing signal with a period corresponding to the output voltage from the analog adjustment circuit. A graphic data reading device comprising: a timing signal output circuit; and a data processing circuit that receives the sampling timing signal output from the timing signal output circuit and reads graphic data.