JPS61109367A - Picture input device - Google Patents

Abstract

PURPOSE:To execute a selective picture input for a small part by making effective only one pulse out of detecting pulses from a position detecting means which exists within one period of the control pulse from a line sensor driving circuit, and forming an output pulse based upon the pulse. CONSTITUTION:At a picture input device 100, travelling rollers 26 and 27 to rotate in accordance with the travelling distance which scans on an original surface Pd manually, are installed. A position detecting device 30, which is composed of an optical encoder, has a slit disk 31 for detecting the rotation which rotates in a single body with the roller 26. A reflecting light from the surface Pd illuminated by a light source 21 makes an incidence on a line sensor 25 from a rod lens array 24. The sensor 25 is driven and controlled by a reset pulse PR generated from a line sensor driving cirfcuit 51. The pulse PR is also supplied to a terminal CLR of an FF52, the pulse PP from the device 30 is supplied to a terminal CK of FF52 and '1' is supplied to a terminal D. Consequently, only one pulse PP, which exists within one period of the pulse PR, is made effective and a selective picture can be inputted.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image input device.

[Conventional technology]

2. Description of the Related Art Conventionally, as image input devices, for example, facsimile machines, V-print paper copiers, diazo copiers, and the like are generally known.

[Problem that the invention seeks to solve]

By the way, all of these conventional image input devices have problems in that it is difficult to selectively input images of small parts, and they are large and inconvenient to carry. In addition, barcode readers, for example, are known as manual "scanning type" input devices, but they cannot input images.The faster the scanning speed becomes, the more difficult it is to read data correctly. The problem was that it became impossible to do so.

Therefore, the present invention was proposed in view of the above-mentioned conventional problems, and it is easy to selectively input images of small parts.
Moreover, it is an object of the present invention to provide a novel image input device that is small, simple, and convenient to carry.

[Means for solving problems]

In order to achieve the above-mentioned object, the image input device according to the present invention has a scanning distance (c) that is manually scanned over a document surface by a scanning roller that rotates around the center, and A position detecting means for detecting a position, a line sensor for reading image information of the document, a line sensor drive circuit for driving the line sensor to a till state with a constant cycle ifj control pulse, and a control output from the line sensor drive circuit. The apparatus includes circuit means for validating only one of the detection pulses from the two-way position detection means existing within one period of the pulse and forming an output pulse based on this pulse.

[Effect]

According to the present invention, only one of the detection pulses from the position detection means existing within one cycle of the control pulse from the drive circuit is validated by the circuit means, and the output is based on this pulse. A pulse is formed. Then, an image signal from the line sensor is output for each output pulse and written into a memory or the like.

〔Example〕

Below, an example of an image input device according to the present invention will be described.
This will be explained in detail using drawings.

FIG.
The figures will be explained in detail later, but first, Figures 2-
The image input device t100 of this embodiment with reference to FIG.
I will explain about it.

An opening 11 is provided at the bottom of the housing 10, and in the vicinity of this opening 11 there are linear light sources 2, 1 such as a Kunogustenor lamp or a light emitting diode array that illuminate the plane Pd of the image to be input. and a light receiving element 22 for detecting the brightness of the linear light source 21. A half mirror 23 is provided above the opening 11, and the light incident from the opening 11 is transmitted through the half mirror 23 or reflected by the half mirror 23. The lens reaches the window section 12 or the rod lens array 24 where the lens is exposed. The light reaching the window 12 allows the user to directly input an image while inputting the image. On the other hand, the rod lens array 24 is a distributed refraction skewer-shaped columnar lens (for example, a diameter 1
~2 mm) are arranged in a flat plate shape, and are self-filmed so that the optical axis is in the horizontal direction. The light from the rod lens array 24 is transmitted to a COD line sensor (hereinafter simply referred to as a line sensor) in which the end surface 24a of the rod lens array 24 and the light receiving surface 25a are arranged to face each other.

) 25. That is, the surface Pd of the image to be input is illuminated by the linear light source 21 provided near the opening 11, and the image is transmitted to the light receiving surface 25a of the line sensor 25 via the half mirror 23 and the rod lens array 24.
The image is formed on the top at the same size.

The rollers 26 and 27 are rotatably supported at the lower portions of the side walls 13 and 14 of the flute body 10, respectively, so that the image input device 100 can move and scan the plane Pd. There is.

Position detection device consisting of an optical rotary encoder'
t30 is composed of a rotation and detection slit disk 31 that rotates integrally with one roller 26, and two sets of rotation detectors 32 and 33 facing each other with this slit disk 31 in between.

The slit disk 31 has a large number of transparent slits 31s provided at equal intervals on its periphery. Rotation detector 32.33
are the light emitting elements 32s, 33S and the light receiving element 32, respectively.
r, 33r, inside a pair of arms 34a, 341) that sandwich the slit disk 31 of the holder 34 fixed to one side wall 13 of the cylindrical body 10. 0.1.2...). As is well known, by arranging the tube rotation detectors 32 and 33 in this manner, the direction of rotation of the slit disk 310 can be determined.

A braking member 41 for controlling the roller 27 is rotatably attached to the side wall 14 of the housing 10 via a rotating shaft 42 provided approximately at the center in the longitudinal direction. Further, a planar jack 43p of a solenoid 43 fixed to the side wall 14 is connected to the upper part of the rotation shaft 42 of the braking member 41, and a spring whose one end is fixed to the upper front wall 15 of the tube body 10 is further connected to the upper part. The other end of 44 is attached.

Further, as a means for activating the image input device 100, for example, a microswitch (not shown) is provided in association with the spindle of the roller 27. That is,
By holding the image input device 100 in your hand and placing it on the surface Pd of the image to be input, the microswitch is closed by the pressing force between the image input device 100 and the surface Pd, and the linear The operations of the light source 21, line sensor 25, etc. are started.

For example, as shown in FIG. 6, the linear light source 21 has a brightness equal to the time t at the moment when the binary microswitch is closed. to time L+-1o CfC, for example, 0.2 to 0.
After about 3 seconds), that is, at time t1, the brightness reaches a predetermined brightness Ll that does not cause any practical problems. 14
It has 4. Therefore, the brightness is set to the predetermined brightness L□
If image input is started before time t1 is reached, the input image information will be invalid due to insufficient light intensity. Therefore, in this image input device 100, the linear light source 21 has a predetermined brightness of 1. When reaching i1, the brake member 41 brakes the roller 27 so that the image input device 1°O does not move on the plane Pd.

That is, 1. As shown in FIG. 7, a light receiving element 22 provided near the opening 11 and detecting the brightness of the linear light source 21 has an inverting input terminal of a comparator 45 whose non-inverting input terminal is connected to a reference voltage Vrcf. connected to the terminal. The output terminal of this conoparator 45 is connected to a solenoid drive circuit 46 that drives the solenoid 43. As shown in FIG. 8, the reference voltage ref connected to the conoparator 45 is determined at the time when the brightness of the linear light source 21 detected by the light receiving element 22 reaches a predetermined brightness of 1 no. At t1, the output of the comparator 45 is set to be inverted from a low level to a high level.

And by setting it like this,
- Linear light source 210 lighting start time t. Since the output of the comparator 45 continues to be held at a low level during the time period from t□ to time t□, the solenoid drive circuit 46 does not drive the solenoid 43. Therefore, the braking member 41 is rotated in the direction of the arrow by the spring 44, and the roller 27 is braked. Also, the brightness of the linear light 021 is a predetermined brightness L□
At time t1, the output of the comparator 45 is inverted to a high level, and the solenoid drive circuit 46 drives the solenoid 43 accordingly. Therefore, the braking member 41 is rotated in the direction of arrow B, and the braking of the roller 27 is released. After time t1, the brightness of the linear light source 21 becomes equal to or higher than L1, so the braking of the row 227 continues to be released.

By providing the braking control system as described above, incorrect image information due to insufficient amount of light is not input, and only normal image information can be input.

Note that instead of detecting the brightness of the linear light source 21 with the light receiving element 22, a timer may be configured using, for example, a counter, and the rotation of the braking member 41 may be temporally controlled. Further, not only the rotation of the braking member 410 may be controlled by the output of the comparator 45, but also the image signal processing system described below may be controlled at the same time.

Next, processing of the image signal obtained by the line sensor 25 will be explained. As shown in FIG. 1, the line sender 25 is driven and controlled by a reset pulse PR with a period T issued from a line sensor drive circuit 51. Further, the reset pulse PR from the line sensor drive circuit 51 is also supplied to the clear terminal CLR of the D flip-flop circuit 52 and the memory 53 such as a semiconductor card or magnetic disk. In this embodiment, it is assumed that the memory 53 is provided outside the image input device 100. Further, the clock input terminal CK of the D flip-flop circuit 52 is supplied with the position detection pulse PP from the position detection device 30, and the data input terminal is supplied with "1". The image signal obtained by the line sensor 25 is converted into a digital signal by an analog/digital (A/D) conversion circuit 54 and written into the memory 53 as image data (2), but the address of the memory 53 at this time is is determined by the reset pulse PR and the output pulse Po from the output terminal Q of the D flip-flop circuit 52. That is, for example, the "row" of the address is determined by the reset pulse PR, the "evening January" of the address is determined by the output pulse Po, and one image data V mn is stored in the address A mn.

Note that the resolution is approximately 7 data/mm to 10 data/body.

Further, this will be explained in detail using the time chart shown in FIG. In contrast to the reset pulse PR with a constant period T shown in (A), the position detection pulse Pp from the position detection device 30 is changed depending on the scanning speed at which the image input device 100 is manually scanned, for example, as shown in (I3) to (ri). The number of pulses within the period T changes as follows.If the scanning speed in the case (B) is V., the scanning speeds in the cases (C) and (■) are 2vo and 3vo, respectively.

Since "1" is always supplied to the data input terminal of the D flip-flop circuit 52, it is set by the row detection pulse PP and reset by the reset pulse PR. Therefore, the scanning speed is V. , 2 Vo,
3 VO In either case, the shaded pulses are thinned out, and the output pulse Po is shown evenly. That is, when the scanning speed is V, the memory 5
Among the image data stored in 3, if the scanning speed is 2VO, 1 out of 2 data will be ignored, and if the scanning speed is 3.
In the case of v(, 2 out of 3 data will be ignored.

In other words, as shown in FIG.
In the case of ~vo, the compression of the image to be inputted is constant at 1, and in the case of vo~3vo, the compression ratio is linearly varied from 1 to 3, and the image data ■ is written to the memory 53. become. Therefore, in FIG. 10, if the scanning direction is the direction of the arrow and the character "A," is the input image, then when the scanning speed is 2vo, the character rAJ is horizontal in the , - direction, compared to when the scanning speed is 0 to vo. 1h compressed, 3
In the case of vo, the data is compressed by <1/3 and written to the memory 53.

By configuring the image signal processing system as described above, the image input device 100 is normally moved within the range of 0-V (,) and the image is captured at a compression ratio of 1, that is, without compression. , when capturing an unimportant image or an image that can be sufficiently recognized even with a small amount of image data, the scanning speed is V.

As described above, the image input device 100 can be moved at high speed to compress and capture images. This allows a large number of images to be captured, and is particularly effective when the memory 53 has a small storage capacity, such as a semiconductor card.

Note that, for example, an N-ary counter (1/N frequency divider) may be provided between the position detection device ff130 and the D flip-flop circuit 52 to change the image compression ratio. Furthermore, if the D flip-flop circuit 52 is omitted, the image compression ratio can be fixed to N regardless of the scanning speed.

Next, the usage and operation of the image input device 100 of this embodiment having the above-described configuration will be explained.

For example, as shown in FIG. 2, when the image input device 100 is held in hand and placed on the surface Pd of an image to be input, the microswitch (not shown) is activated on the image input device 10.
0 and the surface Pd, and the image input device 100 starts operating. At this time, as described above, until the brightness of the linear light source 21 reaches the predetermined brightness L□, the roller 27 is braked by the braking member 41, so the image input device 100 is not moved on the surface Pd. , input of unauthorized image signals is prevented. When the brightness of the linear light source 21 reaches a predetermined brightness L□, the lensoid 43 is driven and the braking of the roller 27 by the braking member 41 is released. Then, an image index signal is generated, and a reset pulse PR is generated from the line sensor drive circuit 51, so that the image immediately below the opening 11 is read into the line sensor 25. After that, when the image input device 100 is moved to the plane Pd by manual scanning within a scanning speed range of 0-vo, this movement causes the rollers 26, 2 to move.
7 and the slit disk 31 rotate.

When the slit disk 31 begins to rotate and the first slit is located between the light emitting element 31s and the light receiving element 31r of one rotation detector 320, a detection pulse Pp is generated. This position detection pulse PP determines the "column" of addresses in the memory 53, and the reset pin yvxP
- Then, the "row" is determined, and the image data Vt of the linear screen that is first read into this first address.
(first data) is written into the memory 53. On the other hand, the light receiving surface 25a of the line sensor 25 has a second linear screen adjacent to the first linear screen due to the movement of the image input device 100.
An image of the linear screen is formed and read.

When the image input device 100 moves further and the slit is located between the light emitting element 33s and the light receiving element 33r of the second rotation detector 330, a second position detection pulse PP is generated.
Second data v2 is read from the line sensor 25 and written to the second address of the memory 53. Also,
At the same time, the third linear screen cannot be read. below,
The same operation is repeated every time the image input device 100 moves a distance corresponding to the interval between the slits 31s. Note that the image input device 100 normally moves at a low speed so that the scanning speed is in the range of 0-vo, and does not capture images that are not important or images that can be sufficiently recognized even with a small amount of data. In such cases, the scanning speed should be set to V. All you have to do is move at a high speed so that

1. For example, if the image input device 100 moves in the opposite direction while inputting an image while the scanning speed is within the range of 0 to ■o, then 2.
The rotation detectors 32 and 33 of the set cooperate to detect the reverse direction of travel and issue a reverse travel detection signal. This backward running detection signal is supplied to the memory 53, and each time the position detection pulse PP from the position detection device 30 is supplied, the data written in the memory 53 is sequentially erased from the end. Already N
When the image input device 100 runs backwards by n data after inputting data, the number of data remaining in the memory 53 is (N-n), and at that time, the image input device 100 moves back by n data. It is at the position where the n+1)th data is to be taken in. When the image input device 100 moves forward by n data again, the number of data written in the memory 53 returns to N, and there is no excess or deficiency. In other words, data before and after the reverse run can be input continuously without duplication or omission of data.

After inputting the required data, when the image input device 100 is released from the surface Pd, the pressure on the roller 27 is released.
The microswitch (not shown) is opened and an end signal is written at the end of image input. After that, the image input device 100 becomes inactive.

By attaching the memory 53 in which image data has been written to an appropriate reading device, an image corresponding to the data can be reproduced on an image display device such as a cathode ray tube. I cut it,
A hard copy can also be obtained using a separate printer.

Note that instead of the above-mentioned microswitch that is operated by pressing force, a switch that is operated by manual operation may be provided, for example, on the side wall 14 of the casing 10. Also,
The memory 53 is provided in the image input device 100, and a display device is provided on the top surface of the casing 10 to display the remaining capacity of the memory 53, the remaining capacity of the battery, etc., and also displays the image data held in the memory 53. It is also possible to provide an image display device such as a liquid crystal display or a flat cathode ray tube to perform various displays as appropriate.

〔Effect of the invention〕

As is clear from the description of the embodiments described above, according to the present invention, selective image input of a small portion using a line sensor is possible, and a small and simple image input device can be obtained. Furthermore, since the position detection means is used, images can be read in the correct positional relationship while manually scanning. Furthermore, images can be read correctly even if the scanning speed is increased. In this case, since the read images are compressed and written to the memory, more images can be imported, especially when the memory has a small storage capacity such as a semiconductor card. It is effective in some cases.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an image signal processing system in an embodiment of the image input device according to the present invention, FIG. 2 is a schematic perspective view showing the adventitia and usage of the image input device of the above embodiment, and FIG. Figure 3 is a schematic perspective view schematically showing the internal configuration,
FIG. 4 is a schematic plan view, FIG. 5 is a schematic side view, FIG. 6 is a graph showing an example of the rise characteristic of a single linear light source, FIG. 7 is a block diagram showing a roller braking control system, and FIG. 8
The figure is a graph showing the output of the conoparator in the braking control system for the roller, FIG. 9 is a time chart showing the operation of the image signal processing system shown in FIG. It is a graph showing image compression with respect to scanning speed. 25... Line sensor 26... Roller 30...
・Position detection device 51...Line sensor drive circuit 5
2...D flip-flop circuit 100...Image input device 'i'M Applicant: Kodo Koike, patent attorney representing a US-style company 1) Eiji Mura - Figure 1 D DQ ' θ Hitoshi Han [ρr/

Claims (1)

[Claims] A running roller that rotates according to a scanning distance that manually scans a document surface, a position detection means that detects a position by rotation of the running roller, a line sensor that reads image information of the document, and the line sensor. a line sensor drive circuit that drives and controls the line sensor drive circuit with control pulses of a constant cycle, and only one pulse of the detection pulses from the position detection means that exists within one cycle of the control pulses from the line sensor drive circuit is valid. An image input device comprising circuit means for forming an output pulse based on this pulse, and outputting an image signal from the line sensor for each output pulse.