JPH02262193A - Picture reader - Google Patents

Abstract

PURPOSE:To directly send out video signals to various video equipments with a simple process by recording picture data read by means of a line sensor and repeatedly read it out at the same frequency as the scanning frequency of a television signal. CONSTITUTION:The picture data S2 is read by an one-dimensional line sensor 5 and A/D converter 7, etc., recorded into a two-dimensional picture memory 9, read out by means of X address and Y address controlled by a memory controller 23, and supplied to a D/A converter 10. At this time, the reading frequency is controlled so as to be coincident with the scanning frequency of the television signal of a NTSC method. Thus, the picture which is read by the line sensor 5 can be converted into the video signals with the simple process and repeatedly outputted to a video printer, VTR etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image reading device, which directly outputs a read image to, for example, a monitor receiver, a video printer, a video tape recorder (hereinafter referred to as a VTR), etc. The present invention relates to an image reading device.

[Summary of the invention]

The present invention relates to an image reading device, and the present invention relates to an image reading device, an image memory for recording the read image data, and when repeatedly reading the image data recorded in the image memory, the reading frequency is adjusted to match that of a television signal. By having a control means that controls the scanning frequency, the image read by the line sensor is converted into a video signal through simple processing, and this video signal is transmitted to a monitor receiver, video printer, VTR, etc. It can be output repeatedly. Therefore, it is possible to directly display an image read by a line sensor on a monitor receiver, print it on a video printer, or record it on a VTR in a short time.

[Conventional technology]

Conventionally, image reading devices scan and read originals using sensors (hereinafter referred to as line sensors) in which amorphous semiconductors, charge-coupled devices (hereinafter referred to as CCDs), etc. are arranged in a linear (one-dimensional) manner. , the read image signal is converted into digital image data using an analog-to-digital converter (hereinafter referred to as an A/D converter), and a digital interface (GPIB, R3232C, 5C) is used.
31, etc.) to the computer, and stored in the computer's large capacity memory.

When displaying these accumulated image data on a monitor receiver or printing it on a video printer, after performing various signal processing using a computer etc., it is sent to the monitor receiver or video printer for display or printing. was sending data.

[Problem to be solved by the invention]

Therefore, even when image data read by an image reading device is simply displayed on a monitor receiver or printed by a video printer, a processing device such as a computer is required, resulting in a large-scale process. Also,
It takes time to send image data read from an image reading device to a processing device such as a computer, and it takes time from reading the original to displaying it on a monitor receiver.

The image reading device according to the present invention has been made in view of the above-mentioned circumstances, and can process image data read by the above-mentioned line sensor in a short time (with good response) without the need for a processing device such as a computer. ) The purpose is to provide an image reading device that outputs directly to a monitor receiver, video printer, VTR, etc.

[Means to solve the problem]

The image reading device according to the present invention includes an image reading means, an image memory for recording the read image data, and when repeatedly reading the image data recorded in the image memory, the reading frequency is set to a television signal. The present invention is characterized in that it has a control means for controlling the scanning frequency.

=3 [Function] According to the image reading device according to the present invention, image data read by a line sensor is converted into a video signal in a short processing time, and this video signal is output to a monitor receiver, video printer, VTR, etc. I can do it. therefore,
Images read by a line sensor can be displayed directly on a monitor receiver in a short time, or printed on a video printer.
It becomes possible to record on a VTR.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image reading device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block circuit diagram of an image reading device that is an embodiment of the present invention.

First, an overview of this image reading device will be explained. The image reading device includes a part that reads an original and generates image data, which is composed of a light source 1, a lens array 4, a one-dimensional line sensor 5, an amplifier 6, an A/D converter 7, and a line buffer 8, and a part that reads the original and generates image data. For example, nine two-dimensional image memories consisting of dynamic RAM (random access memory) and dual port memory, and D/A
Converter 10, mixer circuit 11, Y signal matrix 12
, a C signal matrix 13, and a mixer circuit 14, which generate RGB signals, composite video signals, and S video signals from the image data read from the two-dimensional image memory 9, and a system controller 21, C
A control means 20 for controlling the above-mentioned parts, which is composed of an OD drive/timing generator 22 and a memory controller 23.
It consists of

Next, the operation of this image reading device will be explained. The light from the light source 1 is reflected by the document 3 placed on the glass 2,
This reflected light is incident on a one-dimensional line sensor 5 in which, for example, a plurality of CODs are arranged in a straight line via a lens array 4. That is, for example, an operation similar to that of a copying machine reading a document is performed. The output signal of this one-dimensional line sensor 5 (hereinafter referred to as pixel signal S1) is a signal of three primary colors for one pixel, that is, a red signal (R signal), a green signal (G signal), and a blue signal (B signal). For example, it is supplied to the amplifier 6 as a serial signal switched line-sequentially. This pixel signal S1 is amplified by an amplifier 6, and converted into a digital signal by an A/D converter 7 as an R signal, a G signal, and a B signal in this order. This signal converted into a digital signal is called image data S2.

The above-mentioned image data S2 is used to adjust the output timing of the A/D converter 7 and the writing timing of the two-dimensional image memory 9, for example, first-in/first-out (FI
The image is supplied to a two-dimensional image memory 9 via a line buffer 8 consisting of a FO) memory. The image data S2 supplied to the two-dimensional image memory 9 is recorded in a predetermined memory cell by an address signal, which will be described later, supplied from the memory controller 23.

Here, the above-mentioned one-dimensional line sensor 5, A/D converter 7
2 and 3 show the correspondence between the image data S2 read through the image data S2 and the image data recorded in the two-dimensional image memory 11.
This will be explained using figures.

FIG. 2 shows the relationship between the original 3 and the one-dimensional line sensor 5. As shown in this figure, the one-dimensional line sensor has CCDs arranged in a straight line in the vertical direction on the paper surface, and moves from the left end of the original 3 to the right to scan the entire original.

That is, as shown in FIG. 2, a combination of scanning in the main scanning direction and scanning in the sub-scanning direction is performed. FIG. 3 shows a memory map of the two-dimensional image memory 11. Hereinafter, assuming that a standard television signal (video signal) of the so-called NTSC system is obtained, the number of pixels of the two-dimensional image memory is set to 600 x 525, for example, as shown in FIG.
The explanation will be continued assuming that the axial direction is the X address direction and the Y axis direction is the X address direction.

In FIG. 3, image data S2 is stored in the two-dimensional image memory 9.
Writing is performed as follows.

The image data obtained by main scanning of the left edge of the document is transferred to the memory cell located on the left edge straight line shown in the third column at an X address of 1.
Record sequentially while increasing the number.

Next, when the image data S2 is recorded in all the memory cells located on the straight line at the left end, the one-dimensional line sensor 5 is moved to the right by one pixel, and the X address is incremented by 1. The image data obtained by main scanning is sequentially recorded in the memory cells on the line specified by the X address while increasing the X address by 1 in the same manner as described above. The recording operation is performed by moving the one-dimensional line sensor 5 one pixel to the right and increasing the X address by 1.
The writing operation continues until the image data is recorded in all memory cells of the dimensional image memory 9, and the writing operation ends.

By the way, the driving of the one-dimensional line sensor 5 and the control of the A/D converter 7 and line buffer 8 are performed by the CCD driving and
Controlled by timing generator 22. Further, the above-mentioned X address and control of the X address are controlled by the above-mentioned memory controller 23. The structure of the two-dimensional image memory 9 is such that, for example, when each image data corresponding to an R signal, a G signal, and a B signal is 8 bits, memory cells each having 24 bits per color pixel are arranged two-dimensionally. This can be achieved by creating a structure that Alternatively, it is also possible to have a structure in which 8-bit memory cells are arranged two-dimensionally and there are three memory cells arranged two-dimensionally in the depth direction.

The image data S2 recorded in the two-dimensional image memory 9 as described above is controlled by the memory controller 23, is read out in accordance with the X address, and is supplied to the D/A converter 10.

The reading operation of this two-dimensional image memory 9 will now be explained using FIG. 4. In this figure, unlike the above-described writing of image data, image data is read out in response to a television signal. That is, it corresponds to the so-called interlaced scanning method, and first, image data corresponding to even fields is read sequentially in the X address direction (direction indicated by the arrow on the solid line in FIG. 4), and then image data corresponding to odd fields is read sequentially in the The information is read out sequentially in the address direction (the direction indicated by the arrow on the broken line in FIG. 4). That is, image data is read out from the two-dimensional image memory as follows.

First, the image data recorded in this memory cell is read out starting from an X address of y2 and an X address of X+ (position shown at a in FIG. 4).

Next, only the X addresses are sequentially incremented by 1, and the image data recorded in the memory cells specified by these addresses are sequentially read out. This read operation where the X address is the same y is performed when the X address is X6°.

Continue until the X address becomes X6°. When the successive output of image data is completed, the X address is increased by 2 to y4, the X address is returned to Xl, and while only the X address is increased by 1 again, this X address is All image data (specified by x+ to x6 degrees) is continuously output. The read operation in which the above X address is incremented by 2 is performed when the X address is ys! 6.X address is x3°.

Continue until you reach the position shown in Figure 4b. The X address is y5□6, and the X address is X. . When the successive output of image data is completed, the X address is set to yl, and the X address is incremented by 1 x 3°1 (position shown in C in FIG. 4), and the image data is read out. Next, only the X address is sequentially incremented by 1, the image data recorded in the memory cells specified by these addresses is read out, and the
The address is X6°. The read operation continues until the Next, the X address is increased by 2 to y3, the X address is returned to Xl, and while increasing only the X address by 1 again, this (specified by ゜.). The read operation in which the above X address is increased by 2 is
The address is yszs and the X address is X6°. Continue until (position shown in Figure 4 d) is reached. X address is yS
z3, X address is X6°. When the successive output of image data is completed, the process returns to the above-described starting state of the readout operation and repeats the above series of readout operations. By the way, reading out the image data from position a to position shown in FIG. This is reading of image data corresponding to one screen of even and odd fields. Note that the X address is V
The number of pixels specified by l- and Vszb is 300 each, which is the same as the number of pixels of the above-mentioned two-dimensional image memory 9, which is 600
525 will be enough.

By the way, the control of the above-mentioned X address and X address is controlled by the memory controller 23, and the successive cycle of image data is controlled so as to match the scanning frequency of the NTSC television signal. For example, the cycle of the above 2 increment of the X address is 63.556 μs (15,75
kHz), the readout cycle of one screen (one field) is 3
3.3667m5 (59,940Hz)
It complies with the NTSC system.

In the case of the PAL system, if the period of incrementing the X address by 2 is set to 64 μs (15,625 kHz) and the reading period of one screen is set to 40 m5 (25) 1z), it becomes compliant with the PAL system. In this case, the memory cells in the X address direction are made to correspond to 625 pixels. Alternatively, when there are not enough memory cells in the X address direction to correspond to 625 pixels, the image data corresponding to the missing pixels is used as a blank signal. Also, set the 2 increment period of the X address to 2
If the readout cycle for one screen is set to 9.6296 μs (3,3750 kHz) and 33.333n+s (30H2), it will comply with the high-definition standard.

The image data read out as described above, the R signal image data S3, the G signal image data S4, and the B signal image data S5 are each supplied to the A/D converter 10 as shown in FIG. and converted to an analog signal. Each signal that is not converted into an analog signal is sent to a mixer circuit 11.
, it is mixed with the composite sync signal S6 of the system controller 21 to become three primary color signals, a red signal R1, a green signal G, and a blue signal B, on which the synchronization signal is superimposed. These signals are output to output terminals 33.34.3 respectively.
5, Y signal matrix 12, C signal matrix 13
supplied to In the Y signal matrix 12, a luminance signal Y is generated from a red signal R1, a green signal G, and a blue signal B. This luminance signal Y is supplied to the mixer circuit 14 and the output terminal 37. On the other hand, in the C signal matrix 13, a chromaticity signal C is generated from the red signal R1, green signal G, and blue signal B. This chromaticity signal C is sent to the mixer circuit 14.
and is supplied to the output terminal 38. In the mixer circuit 14, a recomposite video signal is generated from the luminance signal Y and the chromaticity signal C, and this signal is supplied to the output terminal 36. That is, the so-called RGB signals are output from the output terminals 33, 34, 35.
and sent directly to a monitor receiver, for example.

Further, a composite video signal is output from the output terminal 36, and a video signal separated from Y and C is output from the output terminal 37.3.
Output from 8, monitor receiver, video link, VT
The data is sent directly to various video devices such as R.

By the way, the above-mentioned CCD drive/timing generation circuit 22
, the memory controller 23 is the system controller 21
controlled by. This system controller 2
1, a so-called V sync signal VD, an H sync signal HD, and a composite sync signal 5YNC are supplied to output terminals 30, 31, and 32, respectively.

As described above, the image reading device itself is provided with an image memory for recording image data read by a line sensor,
By repeatedly reading this recorded image data at the same frequency as the scanning frequency of the television signal and transmitting the video signal, the video signal can be sent directly to various video devices such as monitor receivers, video printers, and VTRs with simple processing. It becomes possible to send. Therefore, without requiring a large capacity memory or a processing device such as a computer for image data processing, the above read image can be displayed directly on a monitor receiver in a short time, printed on a video printer, or printed on a VTR. It becomes possible to record.

It should be noted that the present invention is not limited to the above embodiments, and the successive cycle of one screen can be set to 50m5 to 12.5n++ (20Hz to 8
0Hz).

〔Effect of the invention〕

As is clear from the above description, according to the image reading device according to the present invention, an image read by a line sensor can be read on a monitor without requiring a large-capacity memory or a processing device such as a computer. It becomes possible to directly display on a machine, print on a video printer, record on a VTR, etc., making it possible to construct an economical system. Additionally, in this case, the time from reading the original to displaying it on the monitor receiver is short, and a system with good response can be realized. In addition, image data can be stored in the memory of the image reading device itself, making it easy to transmit and store read images, and to easily synthesize and edit screens. Furthermore, since images read multiple times are repeatedly transferred to the video equipment, errors during transfer can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of an image reading device according to the present invention, FIG. 2 is a schematic diagram for explaining the relationship between a one-dimensional line sensor and a document, and FIG. 3 is a two-dimensional diagram of image data read by a line sensor. A schematic diagram of a two-dimensional image memory to explain the operating principle when recording to the image memory, and FIG. 4 is a schematic diagram of the two-dimensional image memory to explain the operating principle when reading image data from the two-dimensional image memory. It is a diagram. 5... One-dimensional line sensor 9... Two-dimensional image memory 20... Control means 22... CCD drive/timing generator 23... Memory controller

Claims (1)

[Claims] An image reading means; an image memory for recording the read image data; and, when repeatedly reading the image data recorded in the image memory, the reading frequency is set to the scanning frequency of the television signal. What is claimed is: 1. An image reading device comprising: a control means for controlling the image reading device.