JPH0865464A - Still picture input device - Google Patents

Abstract

PURPOSE: To obtain a still image input device receiving simply a still image with high precision by projecting an optical frame representing an image pickup range so as to form an image on an image sensor. CONSTITUTION: The input device is provided with a camera type image pickup device 1, an image pickup lighting device 4, an aperture representing an image pickup range lighted thereby and an aperture projector 3 to project the aperture. The image pickup device 1 is fixed to a fluorescent lighting fixture 2, and the aperture projector 3 and the image pickup lighting device 4 are housed integrally in a housing and fixed to a desk 7 by a support 5 and a clamp 6. Then the aperture representing the image pickup range lighted by the image pickup lighting device 4 is projected on the desk 7 by the aperture projector 3. An original is positioned based on the lighting. Since a light frame representing the image pickup range is projected on the original, the image pickup range is immediately grasped and a still image is quickly and simply received.

Description

Detailed Description of the Invention

[0001]

The present invention relates to, for example, a CCD (char
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image input device suitable for use in an electronic filing system that images a document such as a book as a subject using a linear image sensor and records the signal on a recording medium such as a magneto-optical disk.

[0002]

2. Description of the Related Art Conventionally, in a camera type image input device, a CCD area sensor for a video camera is used, and a photographing position is confirmed and used on a monitor in real time.

By the way, when considering an input device for easily filing a document or an article of a book, it is convenient to be able to input while the document is placed on the desk. A camera type scanner is suitable for this purpose.

A general structure of a scanner using a camera is shown in FIG. This type of scanner is configured such that a CCD camera 103 is provided on the upper end of a column 102 standing on the document table 101, and an illumination 104 for projecting a document placed on the document table 101.

In such a scanner, since it is difficult to understand the image pickup range, it is necessary to use the monitor 105. Alternatively, it is necessary to write a line on the document table 101 and align the document with the line.

[0006]

However, the monitor 1
The method of checking in 05 is possible with a video output camera, but when using a high-precision line sensor camera that scans while moving the line sensor, there is no suitable output device Since it takes several seconds, it is impossible to confirm the shooting range in real time.

On the other hand, in the method of drawing a line on the original table 101, it is unfavorable to draw a line on the desk unless the desk is a dedicated desk. There is a problem of hiding.

Therefore, the present invention has been proposed in view of the above situation, and an object thereof is to provide a still image input device which can easily capture a highly detailed still image.

[0009]

The still image input device of the present invention is proposed to achieve the above-mentioned object, and is illuminated by the camera type image pickup device 1 and the image pickup illumination device 4. An aperture 22 showing an image capturing range and an aperture projection device 3 for projecting the aperture are provided.

[0010]

According to the present invention, the aperture indicating the imaging range illuminated by the imaging illumination device is projected onto the desk by the aperture projection device. The document can be positioned on the basis of this illumination, and high-precision image input can be easily performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

FIG. 1 shows the basic structure of an embodiment of a scanner for an electronic filing system to which the still image input device of the present invention is applied. In the present embodiment, the purpose is to allow the user to use the scanner without feeling uncomfortable, and considering the use in an extremely ordinary work space such as an office desk, the structure is integrated with a table lighting device.

The image pickup device 1 is fixed to the fluorescent lamp illumination 2,
It is housed together with the aperture projection device 3 and the imaging illumination device 4 in a housing, and is fixed to a desk 7 by a column 5 and a clamp 6.

FIG. 2 shows a block diagram of a signal processing system. Upon receiving the signal from the switch 17, the CPU 14 turns on the lighting device 18 of the imaging lighting device 4. When the start signal comes from the switch 17 again when the positioning of the document is completed, the CPU 14 operates the clock generator 13.

The image formed by the image pickup lens 8 is C
The signal is converted into an electric signal by the CD line sensor 9, passes through the A / D converter 10 and the shading correction circuit 11, and is stored in the memory 1
Then, the image input for one line is completed.

The CPU 14 transfers the data in the memory 12 from the parallel port 15 to a filing system (not shown), and controls the motor driver 16 so that C for one line can be transferred.
The CD line sensor 9 is moved. An image can be input by repeating this for one screen.

FIG. 3 shows the details of the aperture projection device 3 and the photographing illumination device 4. The light emitted from the photographing light bulb 19 is condensed by the condenser lens 20, and the heat ray reflection filter 21
After the infrared rays are cut by, the aperture 22 with a hole is illuminated so that light can pass through only the photographing range. The aperture 22 is projected on the desk 7 by the projection lens 23 and illuminates only the photographing range. Then, a concave reflecting mirror 24 is provided behind the photographing light bulb 19 to improve the light utilization efficiency.

FIG. 4 shows the aperture shape. In this generator, since the projection device is arranged in the fluorescent lamp illumination 2, the aperture is projected obliquely to the document surface. Therefore, as shown in FIG. 4A, a so-called tilt is used in which the plane formed by the original, the lens main surface and the plane formed by the aperture intersect each other on the same line. The aperture shape at this time is not rectangular but is as shown in FIG. When the symbols are taken as shown in FIG. 7A, W'a = W.beta.a W'b = W.beta.b H'a = Ha.betaa.cos .theta. / Cos θ'H'b = Hb.beta.b cos .theta. / Cos .theta. ′ (Where βa = Sa ′ / Sa, βb = Sb ′ / Sb).

[0019]

As described above, according to the present invention,
Since the light frame indicating the shooting range is projected on the document, the shooting range can be grasped instantly, and a still image input device that can quickly and easily capture a still image can be realized.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a basic configuration of a scanner to which a still image input device according to the present invention is applied.

FIG. 2 is a block diagram of a signal processing system.

FIG. 3 is a configuration diagram of an aperture projection device and a projection illumination device.

FIG. 4 is a diagram showing an aperture shape.

FIG. 5 is a general configuration diagram of a scanner using a camera.

[Explanation of symbols]

 1 Imaging Device 2 Fluorescent Lamp Illumination 3 Aperture Projection Device 4 Imaging Illumination Device 5 Support 6 Clamp 7 Desk 8 Projection Lens 9 CCD Line Sensor 10 A / D Converter 11 Shading Correction Circuit 12 Memory 13 Clock Generator 14 CPU 15 Parallel Port 16 Motor driver 17 Switch 18 Lighting device 19 Imaging bulb 20 Condenser lens 21 Heat ray reflection filter 22 Aperture 23 Projection lens 24 Concave reflector

Claims (3)

[Claims] 1. In a still image input device for forming an image of a document on a sensor and reading an image signal, an image is formed on the image sensor by using a projection means for projecting a light frame indicating an image pickup range and a reduction optical system. A still image input device comprising: an image pickup means. 2. The still image input device according to claim 1, wherein the projection means serves as both a photographing light source and a projection light source. 3. The still image input device according to claim 1, wherein the projection means is turned on only when aligning the document and when inputting the document.