JP2654956B2 - Image information processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image information processing apparatus for reading image information drawn on paper sheets such as banknotes, and in particular, while maintaining high reading accuracy of image information. The present invention relates to an image information processing device capable of high-speed reading.

[Conventional technology]

A conventional one-dimensional image sensor reads information detected by a series of light receiving elements from one end to the other end sequentially and sequentially processes the information using a clock pulse.
As described in JP-A-34294, a method has been used in which a read signal is divided and used in a processing circuit.

These prior arts are basically aimed at determining the fitness of a dimension and shape, and cannot be used to determine the authenticity of the content printed on a paper surface, for example, a bill.

[Problems to be solved by the invention]

In the above-mentioned conventional technology, when image information is taken in while conveying a sheet, the conveying speed of the sheet is limited by the processing speed of the image sensor. Therefore, conventionally, when increasing the processing speed of the image sensor, it has been attempted to increase the processing speed of the sensor itself as a device.

However, in a one-dimensional image sensor in which the number of elements is increased to capture image information from wide paper sheets, there is a limit in increasing the speed by, for example, increasing the frequency of a clock pulse when capturing as a serial signal.

An object of the present invention is to provide an image information processing apparatus capable of high-speed reading while maintaining high reading accuracy of image information.

[Means for solving the problem]

In order to achieve the above object, the present invention provides an image information processing apparatus which relatively moves a paper sheet and a one-dimensional image sensor and reads image information drawn on the paper sheet as serial information. The image sensor is formed by a plurality of modules of equal intervals and the same number of elements that are driven in parallel by pulses, and furthermore, the relative speed between the paper sheet and the image sensor is v, the number of elements of each module of the image sensor. , And the frequency of a clock pulse is f, an image information processing apparatus is proposed in which the image sensor and each module are arranged at an angle of d = v · n / f with respect to the relative movement direction.

[Action]

According to the present invention, as shown in FIG. 1 (a), a one-dimensional image sensor is equally divided, driven in parallel by the same clock pulse, and processed at a high speed by parallel processing of sensor output signals.

When the image sensor is divided equally and speeded up, the same figure (b)
As shown in (1), since the transport speed of the paper sheet increases, the paper sheet moves during the reading operation, and a shift x of the unloading position in the shipping direction occurs at the position where the element is divided. If the signal is taken in as it is, a complicated operation at the time of the coordinate rotation operation is required when storing or reading out the memory or determining the print content.

Therefore, the sensor is inclined in the transport direction by the amount of the displacement x, and is arranged as shown in FIG.

With this arrangement, the displacement x in FIG. 3B is corrected, and a discontinuous portion of position detection does not occur between the divided sensors.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. The image sensor 1 is composed of an image sensor division module 2 equally divided so as to include an equal number of light receiving elements 3, and moves relative to a sheet 10 on which an image pattern to be detected is drawn to detect the image pattern. And
Output to the signal processing circuit 100. The signal processing circuit 100 processes the detection signals in parallel.

One embodiment of the configuration of the image sensor 1 is shown in FIG.
When the image sensor division module 2 is divided into four, if the total number of the light receiving elements 3 is 4n, the number of each light receiving element of the division module becomes n. Since each of the divided modules 2A, 2B, 2C, and 2D is arranged obliquely by d with respect to the direction of movement relative to the paper sheet, no discontinuity occurs in the detection position between the divided modules. Therefore, there is no need to perform complicated operations such as coordinate rotation in the subsequent processing circuit, and high-speed processing can be performed.

d is d = vn / f from the number n of light receiving elements of each divided module, the frequency f of the clock pulse for driving and controlling the light receiving elements and the processing circuit, and the relative moving speed v of the image sensor 1 and the paper sheet 10.

One embodiment of the circuit configuration of the present invention is shown in FIG. Splitting module 2 _A to 2 _D of the image sensor 1 is driven in parallel at the same time by the clock pulse 70 made from a clock pulse generator 7. Each image sensor splitting module 2 _A to 2 _D 1
Output 2D _A ~2D _D is inputted via the buffer amplifier 4 _A to 4 _D to the A / D converter 5 _A to 5 _D, and A / D conversion is stored and held in the memory 6 _A to 6 _D, the processing circuit At 8, various calculation processes are performed.

FIG. 5 shows a timing chart of each signal of the circuit of FIG. (A) is a clock pulse 70, (b) is a sensor reading timing of the light receiving element 3 of the image sensor, (c)
The transfer timing of the output of the image signal read by the sensor, (d) is a sensor output 2D _A ~2D _D. A / D converter 5
_A to 5 _D are A / D conversion at the timing showing a sensor output (e), the memory 6 the data A / D conversion at the timing of (f)
It transferred to _A to 6 _D, for storage. Processing circuit 8 data capture from the memory 6 _A to 6 _D at the timing of (g), to calculate the timing of (h).

Next, one embodiment of a circuit configuration using only one A / D converter is shown in FIG. Instead of using a plurality of A / D converters, the sensor output is switched by the multiplexer 9 to perform A / D conversion sequentially and stored in the memory 6.

The transfer of the A / D conversion data shown in FIG. 5 (e) and the A / D conversion data shown in FIG. 5 (f) to the memory must be performed four times during one clock shown in FIG. become. Therefore, the multiplexer 9 and the A / D converter 5 that operate at high speed are used.

According to these embodiments, the image sensor is, for example, 4
Since division and parallel processing are performed, image information can be read four times faster. Further, since the divided modules of the sensor are arranged obliquely to the processing direction according to the processing speed, discontinuity does not occur in the reading position, and high-speed processing can be performed while maintaining high accuracy.

〔The invention's effect〕

According to the present invention, since the image sensor is equally divided, driven in parallel by the same clock pulse, and processed in parallel, the speed can be increased by about m times by dividing into m. In particular, depending on the processing speed, the image sensor dividing module can be used. By disposing it obliquely with respect to the processing direction, discontinuity of the reading position can be eliminated and high accuracy can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a basic configuration of a divided image sensor according to the present invention, and FIG. 2 is a diagram showing an image sensor, a signal processing circuit, and a sheet to be detected of an image information processing apparatus according to the present invention. FIG. 3 is a diagram showing an example of an image sensor in which divided modules are arranged obliquely according to the present invention, FIG. 4 is a diagram showing an example of a circuit configuration of an image information device according to the present invention, and FIG. Is the timing chart of the circuit in FIG.
The figure shows an example of another circuit configuration. 1 ... image sensor, 2 ... image sensor division module, 3 ... light receiving element, 4 ... buffer amplifier, 5 ... A / D converter, 6 ... memory, 7 ... clock pulse generator, 8 ... … Processing circuit, 9… multiplexer, 10… paper sheets, 100… signal processing circuit.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyoshi Katayama 502 Kandatecho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. (56) References JP-A-62-291252 (JP, A) 35162 (JP, U) JP-B 62-45591 (JP, B2) JP-B 60-36672 (JP, B2)

Claims (1)

(57) [Claims] An image information processing apparatus for relatively moving a paper sheet and a one-dimensional image sensor and reading image information drawn on the paper sheet as serial information, wherein the image sensor uses the same clock pulse. Consisting of a plurality of modules of equal intervals and the same number of elements that are driven in parallel, v is the relative speed between the sheet and the image sensor, n is the number of elements of each module of the image sensor, and f is the frequency of the clock pulse. An image information processing apparatus, wherein each module of the image sensor is arranged at an angle of d = v · n / f with respect to the relative movement direction.