JPH0374962A - Manual scanning type scanner system - Google Patents

Abstract

PURPOSE:To always read an original picture as an erected image by detecting the scanning direction of manual scanning, sending a forward/reverse drive signal, and controlling a write direction of original picture information to a picture memory sent from a transmission means based on the forward/reverse drive signal. CONSTITUTION:A forward/reverse drive signal transmission means consists of photo sensors 1,2 and a comparator 3 or the like to generate a forward/ reverse drive signal CC. When original read is started by manual scanning, a forward/reverse drive signal CC representing the drive direction of a read roller from the forward/reverse drive signal transmission means is sent to,e.g. a host B. Then a controller 10 receiving the forward/reverse drive signal CC and acting also like a memory control section controls the write direction of original picture information VD sent from a controller 4 being a transmission means to a picture memory 11 to confirm the display of a substantial original read position. Thus, the original picture is always read as an erected image independently of the original read direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a manual scanning scanner system that transmits read image information to a host while displaying an image read by manual scanning.

[Conventional technology]

A manual scanning type image scanner is connected to a word processor or the like, is placed on the surface of a document, and electrically reads the document by manual scanning. In a manual scanning scanner, a guide mark indicating a reading position is provided on the main body housing so that reading can be started from the position of the document.

However, since the original image to be actually read cannot be seen, the starting position is uncertain and the operability is not good. There is one that has a board attached to it.

According to this method, the reading position on the document surface can be directly monitored, and the starting position can be accurately aligned.

In addition, by suppressing the amount of transmitted external light to a small level using a semi-transparent plate, the influence of external light on the reading results is prevented.

In addition, when reading an image, the scanner 10
Even if the roller 101 rotates with a movement of 0, if the image data write operation is performed at the rear end of the scanner, the distance from the reading position
Delaying the start of reading by 1u, for example, FIG. 11(a)
, (b) have also been proposed.

According to this method, as shown in FIG.
By manually scanning after aligning the desired reading start position a of No. 2 with the rear end of the scanner 100, reading can be started from the desired reading start position a as shown in FIG. There is.

[Problems to be Solved by the Invention] However, in the former, the translucent plate of the slit portion for observing the reading position is made of a material with low transmittance in order to suppress the amount of transmitted external light. Therefore, it is often difficult to identify the reading position on the document surface through the anti-transparent plate. In particular, in the case of a color scanner, the wavelength characteristics of external light are clearly reflected in the color tone, so it is desirable to suppress the amount of transmitted external light as much as possible.

On the other hand, in the latter case, the reading position C varies due to the influence of position adjustment of an image sensor such as a CCD and a lens, so the distance 11tjZ between the rear @b of the scanner 100 and the reading position C varies from scanner to scanner. That will happen.

When reading an image using this method, the distance l! Fluctuations in ItIl result in errors in the reading start position.

Also, the scanner movement amount is a distance 11i from the read image length.
It becomes longer by 1ifl. Therefore, if there is a desired read image in the corner of the thick wood B00, as shown in FIG. 12, for example, the document reading roller 101 cannot come into contact with the document surface, resulting in missing images and decreased operability. There were serious problems such as the unavoidability of

The present invention has been made to solve the above problems, and is directed to an image memory that detects the rotational direction of a reading roller that rotates in contact with the surface of a document during manual scanning and stores image information that is read. An object of the present invention is to provide a manual scanning scanner system that can display a read image as a same-direction image on a display screen without depending on the rotation direction of a reading roller by controlling the writing direction.

[Means to solve the problem]

The manual scanning scanner system according to the present invention includes a forward/reverse rotation signal sending means for detecting the scanning direction of manual scanning and sending out a forward/reverse rotation signal, and a forward/reverse rotation signal sent from the forward/reverse rotation signal sending means. A memory control section is provided for controlling the direction in which document image information sent from the sending means is written into the image memory based on the following.

[Effect]

In this invention, when document scanning is started by manual scanning, a forward/reverse rotation signal indicating the rotation direction of the reading roller is sent out from the forward/reverse rotation signal sending means, and upon receiving this forward/reverse rotation signal, the memory control unit controls the direction in which original image information sent from the sending means is written into the image memory, making it possible to display and confirm the original original reading position.

〔Example〕

FIG. 1 is a block diagram illustrating the configuration of a manual scanning scanner system showing an embodiment of the present invention, which is roughly divided into a manual scanning scanner A and a host B. Interface cable C
Connected to A.

First, the configuration of the manual scanning scanner A will be explained.

1.2 is a photosensor, and when a reading roller 26 (described later) rotates normally, a sensor signal S of the photosensor 1 rises first, and then a sensor signal S2 of the photosensor 2 rises. 3 is a comparator, which receives the sensor signals Sl, S
2 and outputs a forward/reverse rotation signal CC to the controller 4, and also outputs a sensor signal S to the signal generator 5 manually. The signal generator 5 generates a start signal AR indicating the start of main scanning, a main scanning synchronization signal AU, and a timing signal WG that determines data acquisition timing from the sensor signal S1.

A sub-scanning synchronization signal ST is generated and output to the controller 4.

Note that the photosensor 1.2, comparator 3, etc. constitute a forward/reverse rotation signal sending means, and the forward/reverse rotation signal C
Generate C.

Reference numeral 6 denotes a tact switch, which outputs a switch signal SU to the controller 4 when a reading switch 29, which will be described later, is pressed. Reference numeral 7 denotes an image sensor composed of a charge-coupled device such as a CCD, in which cells of a predetermined number of pixels are arranged in one column.

An amplifier 8 amplifies the image analog signal output from the image sensor 7. A binarization circuit 9 binarizes the amplified image analog signal at a predetermined slice level, converts it into a digital signal, and outputs the digital image signal VD to the controller 10 of the host B via the controller 4.

In the host B, an image memory 11 stores, for example, 512 lines of digital image signals (image data) VD read and sent from the manual scanning scanner A.

12 is an address counter that sequentially counts up or down the write address set by the controller 10 to the image memory 11, and
Holds a write address of 1. 13 is a liquid crystal display device that displays the digital image signal (image data) VD stored in the image memory 11; Note that the controller 10 also sets the initial value i and the number of steps to to the address counter 12, and controls the writing direction of the digital image signal (image data) VD to the image memory 11 based on the forward/reverse rotation signal CC. do.

In the manual scanning scanner system configured as described above, when reading a document by manual scanning is started, a forward/reverse rotation signal C indicating the rotation direction of the reading roller is sent from the forward/reverse rotation signal sending means to, for example, the host B. In response to this forward/reverse rotation signal CC, the controller 10, which also serves as a memory control section, transfers the document image information (digital image signal (image data) VD) sent from the controller 4, which constitutes the sending means, to the image memory 11. The writing direction is controlled as described later, and the original document reading position is displayed and confirmed.

FIG. 2 is a sectional view illustrating the configuration of the manual scanning scanner A shown in FIG. 1, and the same parts as in FIG. 1 are given the same reference numerals.

In the figure, reference numeral 21 denotes an illumination lamp composed of a xenon cathode tube or the like, which irradiates a document surface 22 with white light. 23.2
Reference numeral 4 denotes a scanning mirror, which directs the reflected light from the document surface 22 to a condensing lens 2.
The image is formed on the image sensor 7 via the image sensor 5.

Reference numeral 26 denotes a reading roller composed of, for example, a rubber roller, which rotates while contacting the document surface 22. Two encoder plates 30 and 32 are fixed to a shaft 31 that rotates as the reading roller 26 rotates. , this encoder plate 30
．． 32, a photosensor 1.2 serving as a photointerrupter is provided as shown in FIG.

Note that the encoder plates 30 and 32 are fixed so as to have a phase difference of approximately π/2 with respect to the rotational direction of the shaft 31.

Reference numeral 27 denotes an image processing board, on which the above-mentioned controller 4 and the like are arranged, and controls image reading by the image sensor 7.

Reference numeral 28 denotes a housing, each part of which has been shaped so that the scanner can grasp the housing 28 naturally. Reference numeral 29 denotes a reading switch, which is configured to turn on the tactile switch 6 by pressing it in the direction of the arrow. When the tactile switch 6 is in the ON state, the above-mentioned switch signal SU is output.

Next, the judgment sending process of the forward/reverse rotation signal CC will be explained with reference to FIG.

FIG. 4 is a timing chart explaining the operation of the comparator 3 shown in FIG. 1. Components that are the same as those in FIG. 1 are given the same reference numerals.

As can be seen from this figure, a sensor signal SI+S2 having a phase difference of π/2 is outputted to the comparator 3 from the photosensor 1.degree.2 as the reading roller 26 rotates. At this time, the sensor signal SI.

When the sensor signals S, . On the other hand, sensor signal S2. S, in the order of sensor signals S,
, S2 rises, it is determined that the rotation is in the reverse rotation state, and the forward/reverse rotation signal CC is turned off.

FIG. 5 is a timing chart illustrating the image processing operation of the contalk 10 shown in FIG. Components that are the same as those in FIG. 1 are given the same reference numerals.

As can be seen from this diagram, the controller 10 of host B
is the image data V from the leading signal AR immediately after detecting the rising edge of the sub-scanning synchronizing signal ST to the next leading signal AR.
D is treated as valid data.

Next, image reading processing in the manual scanning type scanner system according to the present invention will be explained with reference to FIG.

FIG. 6 is a flowchart illustrating an example of an image reading process procedure in the manual scanning scanner system according to the present invention. Note that (1) to (16) indicate each step.

First, a direction parameter j, which is a parameter for the rotation direction, is set to "0" indicating that it is undetermined (1).

Next, as shown in FIG. 7(a), the scanner is set with the front end 301 of the scanner aligned with the desired reading start position a on the document surface 22 (2).

Note that marks 302 and 303 are provided on the tip 301 to indicate the reading position in the width direction.

Next, the controller 4 waits for the switch signal SU to be sent out from the tact switch 6 (3), and masks the sub-scanning synchronization signal ST while the switch signal SU is not being sent out, and when the reading switch 29 is pressed. When the tactile switch 6 is turned on and the switch signal SU is sent out, the sub-scanning synchronization signal ST is unmasked. Next, the housing 28 is moved in the direction of the arrow 304 shown in FIG. 7(b) and waits for the sensor signal S1 to be sent out from the photosensor 1.4) When the sensor signal S1 is sent out, the image data VD is imported to the host B side.

Next, it is determined whether the direction parameter j is "O"5) If YES, it is determined whether the forward/reverse rotation signal CC is in the ON state, that is, in the "forward rotation" state.8) If No (reverse rotation state), the address The final address r512J is set as the initial value to the write address i of the counter 12, and the step value i is set. is set to "-1" and the direction parameter j is set to "2" indicating reversal.
7) Proceed to step (13) onwards.

On the other hand, if the determination in step (6) is YES, the write address i of the address counter 12 is set to "1", which is the first address, and the step value 10 is set to "1".
", and set the direction parameter j to "1" indicating normal rotation (8), and proceed to step (13) onwards.

On the other hand, if the determination in step (5) is NO, it is determined whether the direction parameter j is "1" or not. 9) If YES, the roller direction parameter K indicates the rotation direction of the reading roller 26 during image reading. Please set "1" to indicate 1.
0), it is determined whether the roller direction parameter K matches the direction parameter j or not 12). If NO, the process returns to step (6), and if YES, the process proceeds to step (13) and onward. Note that in step (lO), the image on the display screen is cleared by clearing the image memory 11, or the image data is overwritten.

On the other hand, if the determination in step (9) is No, the roller direction parameter K indicating the rotation direction of the reading roller 26 during image reading is set to "2" indicating reverse rotation (11), and the process proceeds to step (12).

Next, the image data VD is written to the address indicated by the write address i (13), and the written data is displayed on the liquid crystal display device 13 (14). Next, the step value i0 is added to the write address i (15), and it is determined whether the write address i is 512 or more (at the time of normal rotation reading) or whether the write address i is less than 1 (16).
, if YES, the process ends; if NO, step (3)
) and repeat the forward image reading or reverse image reading process. As a result, when the scanner is scanned from the reading position C toward the reading direction 305 as shown in FIGS. 8(a) and 8(b), the image shown in FIG. 9(a) is scanned.

As shown in (b), the read image is displayed on the liquid crystal display device 13 in parallel with the reading.

Therefore, even when the original on the original surface 22 is read in the direction of the arrow 304 as shown in FIG. ), the letters C and N are stored and displayed as normal images. In this way, the read image can be displayed as a normal image on the liquid crystal display device 13 regardless of the reading direction of the scanner, so before reading, scan in the opposite direction to the reading direction to find the desired reading start position. The image can be read accurately from the desired value by scanning while looking at the displayed image until the desired value is confirmed, and then reading and scanning in the forward direction when the leading edge of the desired image is displayed.

Note that in the above embodiment, the case where the alignment reference exists at the leading edge of the document was explained, but in contrast, if it exists at the trailing edge of the document, while reading in the forward direction, When the edge is displayed, if you move in the opposite direction and read the original image, the write address i will be changed to r.
It can be read as a normal image in the direction that is counted down sequentially from 512J.

In the above embodiment, when the reading direction is the reverse direction, the write address i is sequentially counted down from r512J and displayed as a normal image.
The old image data VD stored in , and the write address i was "1", was stored in the write address i "2", and the old image data VD was stored in the write address i, "2".
The configuration may be such that a normal image is obtained by moving the old image data VD to the next higher address, such as writing address i to "3".

Further, in the above embodiment, as shown in FIG. 3, the rotational direction detection mechanism is constructed by the encoder plates 30, 32, photosensors 1, 2, etc., but as shown in FIG. By arranging the encoder plate 93 and the two photosensors 83 and 84 with a phase difference so as to satisfy the above positional relationship, the rotation direction can be determined in the same manner as in the above embodiment. Alternatively, a mechanism may be used in which the direction of rotation is detected by a switch that is turned on in response to rotation in one direction.

〔Effect of the invention〕

As explained above, the present invention provides a forward and reverse rotation signal sending means for detecting the scanning direction of manual scanning and sending out a forward and reverse rotation signal, and a forward and reverse rotation signal sent from the forward and reverse rotation signal sending means. Since the memory control means is provided for controlling the writing direction of the original image information sent from the sending means into the image memory based on the above-mentioned information, the original image can always be read as a normal image regardless of the original reading direction.

Therefore, even when setting the reading start position of a document image, it is possible to accurately align the image reading start position while viewing the image displayed on the display means, even if the scanner body is not equipped with a document transmission mechanism. can. In addition, image data can be stored as a normal image in the image memory regardless of the document image reading direction, so if the image is drawn in the corner of a document, such as a book document, where the document image cannot be stably read due to the scanner structure. Even when reading an image, it can be read as a normal image in the direction where the scanner's reading position relationship is stable, so it has excellent effects such as being able to fully avoid reading errors and failures that occur in the past. .

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating the configuration of a manual scanning scanner system showing one embodiment of the present invention, and FIG.
A cross-sectional view illustrating the configuration of the manual scanning scanner shown in the figure.
FIG. 3 is a perspective view illustrating the main structure of the manual scanning scanner shown in FIG. 2, FIG. 4 is a tie chart explaining the operation of the comparator shown in FIG. 1, and FIG. ,
FIG. 1 is a timing chart explaining the image processing operation of the controller shown in FIG. b) is a schematic diagram illustrating reverse image reading and display processing in the manual scanning scanner system according to the present invention; FIGS.
b) is a schematic diagram illustrating normal rotation image reading processing in the manual scanning scanner system according to the present invention; FIG.
) and (b) are schematic diagrams illustrating normal rotation image display processing in the manual scanning scanner system according to the present invention C, No. 10
The figure is a perspective view illustrating another reading direction detection mechanism in the manual scanning scanner system according to the present invention, and FIGS. It is a schematic diagram for explaining. In the figure, 1 and 2 are photosensors, 3 is a comparator, and 4.
10 is a controller, 11 is an image memory, 12 is an address counter, and 13 is a liquid crystal display device. Fig. 3 If ε Fig. 7 Fig. Fig. 1 Fig. 2

Claims (1)

[Claims] an image sensor that converts a document image into an electrical signal and reads it; a pulse generator that generates a pulse signal as the image sensor manually scans the document image; In a manual scanning scanner system, the manual scanning scanner system includes a sending means for sending document image information read by a sensor to an image memory, and a display means for displaying document image information sent from the sending means to the image memory. forward/reverse rotation signal sending means for detecting the direction and sending out a forward/reverse rotation signal; and the document image information sent from the sending means based on the forward/reverse rotation signal sent from the forward/reverse rotation signal sending means. What is claimed is: 1. A manual scanning scanner system comprising: a memory control unit that controls a writing direction to an image memory.