JPH0758919A - Original reading output device - Google Patents

Abstract

PURPOSE:To display image data on a display monitor without using a personal computer by reading out the image data synchronizing with the periodic signal of a video signal, and outputting it as a still picture video signal. CONSTITUTION:Original image data read by a linear image sensor 2 is outputted from a digital interface part 7 via buffer memory 5. While, an output from an A/D converter 4 is written on frame memory 8 by the control of a write control part 9 apart from the above output. The digital image data in the frame memory 8, after the one of original one page being written, is read out at the prescribed timing of the video signal from a synchronizing signal generating part 14 by a readout control part 10. The read out digital image data are converted into an analog signal by a D/A converter 11, and is outputted from a video signal output interface part 12 to external display equipment, for example, the display monitor 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a document reading and outputting device that reads a linear image sensor such as a (Charge Coupled Device) and outputs it as image data to an external peripheral device.

[0002]

2. Description of the Related Art Document image information is read by moving and changing the relative position of a document table and a linear image sensor such as a CCD, and this data is read by a predetermined general-purpose interface (for example, a digital data interface called Centronics). An example of a device that outputs according to the protocol is shown in FIG.

In FIG. 4, 1 is a document table on which a document is placed,
Reference numeral 2 is a linear image sensor that continuously moves in parallel along the platen 1 at a predetermined speed. Reference numeral 3 is a timing generator that specifies the timing of reading and writing on the linear image sensor 2. Reference numeral 4 is an A / D converter. Is a buffer memory for storing read data for at least one line of the original, 6 is a read control unit of the buffer memory 5, and 7 is an output interface unit.

Next, the operation will be described. While moving along the document table 1 on which the document is placed, the linear image sensor 2 receives the reflected light from the document to read the document information. The linear image sensor 2 is composed of an element such as a CCD. The reading clock signal of the linear image sensor 2 is given by the timing generator 3. Generally, the output of a linear image sensor is an analog signal,
This is converted into a digital signal by the A / D converter 4 so that it can be easily stored and processed.

The digital signal from the A / D converter 4 is temporarily stored in the buffer memory 5. The data in the buffer memory 5 is read by the buffer memory read control unit 6 and output to the external peripheral device through the output interface unit 7. The output interface unit 7 is a general-purpose interface unit for transmitting digital data, which is called Centronics, for example.

In general, such an original reading and outputting apparatus is called an image scanner, and is often commercialized as a peripheral apparatus for the purpose of image input of a personal computer.

[0007]

The conventional document reading and outputting apparatus as described above is mainly a peripheral device of a personal computer, operates by being controlled by the personal computer, and transmits image data to the personal computer. Image information is used by storing data, performing image processing, processing files, and the like. Therefore, the conventional document reading and outputting device always requires a host device such as a personal computer, and simply
For example, a personal computer is indispensable even for the purpose of giving a presentation by displaying an original document such as a color catalog on a display device, so that there is a drawback that the system becomes complicated and expensive. Further, although there is a method of using a video camera (for example, a document camera) for such a purpose, it is more disadvantageous than that of using a linear image sensor in terms of resolution.

The present invention has been made in order to solve the above problems, and has a function of outputting digital image data through a general-purpose interface section similar to the conventional document reading and outputting apparatus, and at the same time, for example, general The present invention aims to provide a device having a function of outputting image data in the form of a color television signal (NTSC signal).

[0009]

A document reading and outputting apparatus according to the present invention converts image information of a document read by a linear image sensor into digital data, and then temporarily stores one document or a plurality of documents. A frame memory having a capacity is stored, a signal of the frame memory is converted into a video signal of a predetermined system, read out, converted into an analog signal, and the analog signal is output as a still image video signal.

Further, when the signal of the frame memory is read, in order to convert the signal of the frame memory into a video signal of a predetermined system and read out, a plurality of synchronization signals of different video signal systems are supplied to the frame memory read control section. Is provided, and one of the plurality of synchronization signal generators is supplied to the frame memory read controller by a changeover switch.

[0011]

The original reading / outputting apparatus according to the present invention has a function as a conventional original reading / outputting apparatus (scanner), and at the same time, reads out the image data once stored in the frame memory in synchronization with the synchronizing signal of the predetermined system video signal.
This is output as a still image video signal. Therefore, the document information can be displayed on the display monitor without using a personal computer.

[0012]

EXAMPLES Example 1. FIG. 1 is a block diagram showing an embodiment of the present invention, and 1 to 7 are the same as those shown in FIG.
Reference numeral 8 is a frame memory, 9 is a write controller of the frame memory 8, and 10 is a read controller of the frame memory 8. Reference numeral 11 is a D / A converter, 12 is a video signal input interface unit, 13 is a display monitor, and 14 is a sync signal generation unit for giving a sync signal to the read control unit 10 as a timing reference.

Original image data read by the linear image sensor 2 is converted into digital image data by the A / D converter 4, and then output from the digital interface section 7 through the buffer memory 5 as in the conventional case. On the other hand, apart from this, the A / D converter 4
The output from the write control unit 9 is sent to the frame memory 8.
Is written by being controlled by. After one page of the original has been written, the digital image data in the frame memory 8 is read by the read control unit 10 by the sync signal generator 14.
Are read out at a predetermined video signal timing.

The timing of a predetermined video signal, eg, an NTSC color television signal, is generated by the sync signal generator 14. The read digital image data is D
The signal is converted into an analog signal by the / A converter 11, and is output from the video signal output interface unit 12 to an external display device such as a display monitor 13. With the above-described configuration, it is possible to use a document reading and outputting device (scanner), which was conventionally unsuitable for the purpose of displaying a document image on a display monitor without using a personal computer, for that purpose. It can also have a function as a peripheral device.

Example 2. FIG. 2 shows another embodiment of the present invention. In contrast to FIG. 1, in order to make the frame memory 8 have a capacity for storing a plurality of original image data, 8-1, 8-2, 8 -3 ... 8-N is replaced with a frame memory.

The purpose of using the video signal is often a presentation as described above. At this time, it takes too much time to display many originals on the display monitor 13 if the linear image sensor 2 is read each time, and the effect of the presentation is reduced. Therefore, in the structure described above, the frame memories 8-1, 8-2, 8-3, ...
If the image data of the original is stored in N in advance and is called at the time of presentation, the desired original can be displayed quickly and the effect of the presentation can be further enhanced.

Embodiment 3. FIG. 3 shows another embodiment of the present invention, which is different from that shown in FIG.
A plurality of sync signal generators 14 having different video signal formats.
-1, 14-2, 14-3 ... 14-N,
These are switched by the changeover switch 15 and added to the read control unit 10.

The signal format of the output video signal is different from the standard one such as NTSC, and the horizontal scanning frequency and the vertical scanning frequency are different from this, and the number of scanning lines is different in many cases.
In order to support these many video signal formats, it is necessary to use a monitor with an auto scan or free scan function as a display monitor, but in this embodiment, a display monitor compatible with a single signal format is used. The output of the corresponding signal format can be supplied to the display monitor.

According to this embodiment, the user can select the sync signal generators 14-1, 1 and 1 that match the input signal format of the display monitor.
4-2, 14-3 ... 14-N changeover switch 1
By selecting in 5, the document information can be output to the display monitor 13, so that the operation becomes extremely simple.

[0020]

As described above, according to the present invention, since the document reading and outputting device is provided with the frame memory, the document information can be displayed in the form of a video signal without using other control equipment such as a personal computer, which is simple. It is possible to provide a presentation system with various configurations.

Further, since it also has a digital interface section for outputting high-resolution digital data at the same time, it also has a function as an image input peripheral device for equipment such as a personal computer.

[Brief description of drawings]

FIG. 1 is a block diagram showing a document reading and outputting apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an original reading / outputting device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing an original reading and outputting apparatus according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a conventional document reading and outputting apparatus.

[Explanation of symbols]

 1 Document Plate 2 Linear Image Sensor 3 Timing Generator 4 A / D Converter 5 Buffer Memory 6 Buffer Memory Read Control Section 7 Output Interface Section 8 Frame Memory 8-1 Frame Memory 8-2 Frame Memory 8-3 Frame Memory 8-N Frame memory 9 Frame memory write control unit 10 Frame memory read control unit 11 D / A converter 12 Video signal output interface unit 13 Display monitor 14 Sync signal generation unit 14-1 Sync signal generation unit 14-2 Sync signal generation unit 14-3 Sync signal generator 14-N Sync signal generator 15 Selector switch

Claims (3)

[Claims] 1. A reading unit for reading image information of a document by changing a relative position between the document table and the linear image sensor at a predetermined speed, and reading data from the reading unit. A / D converter for converting to digital data and this A
An output interface section for outputting digital data from the A / D converter with a predetermined resolution and a predetermined interface protocol, a frame memory for temporarily storing the digital data from the A / D converter, and a signal of the frame memory in a predetermined system. Read-out means for converting the video signal to read out, and a D / A converter for converting the signal read out by the read-out means into an analog signal;
An original reading / outputting apparatus comprising: a video signal output interface section for outputting the analog signal as a still image video signal. 2. A reading unit for reading image information of a document by changing a relative position between the document table and the linear image sensor at a predetermined speed, and reading data from the reading unit. A / D converter for converting to digital data and this A
A frame memory for temporarily storing one or a plurality of originals of digital data from the D / D converter, a reading means for converting the signal of the frame memory into a video signal of a predetermined system and reading the same, and a reading means for reading by the reading means. An original reading and outputting apparatus comprising: a D / A converter for converting the converted signal into an analog signal; and a video signal output interface section for outputting the analog signal as a still image video signal. 3. A reading unit for reading image information of a document by changing a relative position between the document table and the linear image sensor at a predetermined speed, and reading data from the reading unit. A / D converter for converting to digital data and this A
A frame memory for temporarily storing digital data from the D / D converter, and a plurality of frame memory read control units for supplying synchronization signals of different video signal systems to a signal of the frame memory for conversion into a video signal of a predetermined system and reading. Sync signal generator, a sync signal selector switch for supplying one of the plurality of sync signal generators to the frame memory read controller, and a signal read from the frame memory converted into an analog signal. An original reading / outputting device comprising a D / A converter and a video signal output interface section for outputting the analog signal as a still image video signal.