JPS62212790A - Image scanning data input system - Google Patents

Abstract

PURPOSE:To accurately read out an image by providing the titled system with a signal control circuit and controlling a scanning start signal to be inputted to an image input signal circuit based on a driving signal for controlling the carrying speed of a recording medium carrying mechanism. CONSTITUTION:The circuits are constituted so that the output of a driving signal circuit 2 is connected to the signal control circuit 8 and the output of the circuit 8 is inputted to the image input signal circuit 66. The circuit 8 consists of a flip flop (FF) 81 and an AND circuit 82, the FF 81 is inverted by inputting a driving signal to the circuit 8, and when the succeeding scanning start signal is inputted, an AND condition is formed and a pulse is outputted from the AND circuit 82. On the other hand, the FF 81 is inverted by the output pulse to inhibit the output of a scanning start signal until a driving signal is inputted. Consequently, a normal image input can be obtained.

Description

[Detailed Description of the Invention] [Summary] This is an image scanning data input method, and includes a signal control circuit that controls an image capture signal generated in synchronization with a scanning start signal in conjunction with generation of a drive signal for a transport mechanism. This makes it possible to perform normal image reading even when the conveyance speed of the recording medium changes.

[Industrial application field]

The present invention relates to an image input method when the conveyance speed of a recording medium changes.

Image input to an image recognition device is performed by optically scanning a recording medium on which an image to be recognized is recorded in a direction perpendicular to the conveying direction while being moved by a conveying device, and receiving the reflected light from the image with an electric sensor. It is converted into a signal, converted into a digital signal, and stored in an image memory.

Required portions are then extracted from the image memory to perform image recognition, for example recognition of symbols, characters, and the like.

When the transport mechanism starts and stops, the transport speed of the recording medium fluctuates, and the timing with the image capture signal, etc. is difficult. Therefore, image reading is normally performed when the transport speed of the recording medium is constant. There is.

However, in order to increase the speed of image processing, there is a need for a system that can perform reading even under such conditions where the speed fluctuates.

[Conventional technology]

FIG. 4 shows a block diagram of the configuration of a conventional image input device.

Normally, the recording medium conveyance system of an image input device is driven by, for example, a pulse motor, and the reading system optically scans the recording medium, and image data is converted into an electrical signal by a CCD element and input. Ru.

As shown in the figure, the basic clock generated by the basic clock circuit 1 of the image input device is input to the drive signal circuit 2 to switch and control the drive phase of the pulse motor! All Ji1 motion signals are sent.

The drive signal controls the speed of the pulse motor 4 via the drive circuit 3.

On the other hand, the basic clock is input to the scan start signal circuit 5 to generate a scan start signal, this signal is input to the image capture signal circuit 6 to generate an image capture signal, and this image capture signal is used for image reading. Each time the image data is input to the circuit 7, image data of each scanning line of image pixels is read by a reading sensor, for example, a CCD element.

FIG. 5 shows a time chart of these signals, in which one scan data of an image by the CCD element is input during the image capture signal period, and each time that one scan data is input, the pulse motor advances the recording medium by one step. It has become.

[Problem that the invention seeks to solve]

In this conventional method, when the recording medium conveyance step and the image data capture are synchronized in the relationship shown in the time chart in Figure 5, that is, when the recording medium is being fed at a constant speed, normal operation occurs. Although image data can be read, for example, in a speed transition state from a constant speed to deceleration to a stop, the pulse interval of the pulse motor drive signal gradually becomes delayed.

However, since the cycle of the scan start signal does not change, the image is read, for example, twice or more for each step of feeding of the recording medium.

That is, if scanning is performed twice at the same image location and the same image is read twice or more, the input image becomes an image that is longer than the original image.

Furthermore, if the pulse interval of the drive signal is shorter than that of the scan start signal when the drive signal is accelerated, there will be scanning lines of unread images, and the input image will be shrunk from the original image.

In either case, the image is not being read accurately.

[Means for solving problems]

FIG. 1 shows a block diagram of an original 11 of the image scanning data input method of the present invention.

In the figure, 1 is a basic clock circuit, 2 is a drive signal circuit, 3 is a drive circuit, 4 is a pulse motor, 5 is a scan start signal circuit, 6 is an image capture signal circuit, 7 is an image reading circuit, and attached signals The circuit is configured such that the output of the drive signal circuit 2 is connected to the control circuit 8 and the output of the signal control circuit 8 is input to the image capture signal circuit 6.

[Effect]

A drive signal generated by a pulse motor drive signal circuit is input to the drive circuit to drive the pulse motor, and is also input to the signal control circuit.

This input signal controls the image capture signal based on the next scan start signal.

That is, one image capture signal is generated between pulses of the drive signal, and therefore the number of drive signals and the number of image capture signals are controlled to be the same.

〔Example〕

FIG. 2 shows a circuit diagram of an embodiment of the signal control circuit according to the present invention. As shown in the figure, the signal control circuit 8 consists of a flip-flop 81 and an AND circuit 82. The pulse 81 is inverted, and when the next scan start signal is input, the AND condition is satisfied and the AND circuit 82 outputs the pulse.

On the other hand, the output pulse inverts the flip-flop 81,
The output of the scan start signal is prohibited unless a drive signal is input.

FIG. 3 shows a time chart of the embodiment, showing the relationship between the signals when the conveyance of the recording medium is decelerated from a constant speed and comes to a stop.

Only the image capture signal following the drive signal is input to the image reading circuit 7, so that one scan data of the image is read with one step of the pulse motor.

That is, the scanning start signal marked O in the figure does not generate an image capture signal by the signal connection circuit.

It goes without saying that the present invention is also applicable when the conveyance of the recording medium accelerates from a stopped state and reaches a constant speed.

Therefore, expansion and contraction of the image due to acceleration and deceleration of the pulse motor is prevented.

〔Effect of the invention〕

As described above, according to the present invention, even if the conveyance speed of the recording medium changes, normal image input can be obtained by controlling the image capture signal, which is extremely useful in practice. be.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the principle configuration of the image scanning data input method of the present invention, Fig. 2 is a signal control circuit diagram of the embodiment, Fig. 3 is a time chart of the embodiment, and Fig. 4 is a block diagram of the configuration of the conventional example. , FIG. 5 is a time chart during constant speed conveyance. In the figure, 1 is a basic clock circuit, 2 is a drive signal circuit, 3 is a drive circuit, 4 is a pulse motor, 5 is a scan start signal circuit, 6 is an image capture signal circuit, and 7 is an image reading circuit. 1111!1 Jangjeong (fsu no 71 muna ←- No. 311

Claims (1)

[Claims] The image reading circuit (6) scans the recording medium in a direction perpendicular to the conveyance direction while conveying it, and uses an image acquisition signal generated by the image acquisition signal circuit (6) in synchronization with the scanning start signal. 7)
In an image input device that reads an image of the recording medium for each scanning line via a signal control circuit and inputs the image data, a signal control circuit (8) is provided, and a drive signal that controls the conveyance speed of the recording medium conveyance mechanism is used. An image scanning data input method characterized in that a scanning start signal input to the image capturing signal circuit (6) is controlled.