JPH02312354A - Image reader - Google Patents

Abstract

PURPOSE:To display the feature of an electronic viewer such as the inversion of a negative image by providing a two-dimensional photoelectric conversion means integrally with a subscan member to perform the subscan of a one- dimensional photoelectric conversion means. CONSTITUTION:A transparent original 4 is projected, and the projection is read with the one dimensional photoelectric conversion means such as a CCD line sensor 6, etc., and is converted to an electrical signal. At such a case, a system is comprised so that the state of a viewer/a reading state can be switched corresponding to the position of the subscan member 8 by providing the member 8 which performs the subscan of the CCD line sensor 6 for image reading integrally with a CCD area sensor 7 for electronic viewer that is the two-dimensional photoelectric conversion means. In such a way, it is possible to perform the inversion display of a negative film image, and an easy way to use can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an image reading device that projects a transparent original such as a film onto a sensor and sequentially converts image information into electrical signals. Relates to a device equipped with a viewer for checking images.

[Conventional technology]

Conventionally, this type of film image reading device is comprised of two systems, a sensor system and a viewer optical system, as shown in FIG. FIG. 6 shows a cross section of the microfilm reader, and the image of the microfilm 1002 can be visually confirmed on the screen 1001. 1003 is a light source for illumination, 1004 is a condensing illumination lens, and 1005 is a projection lens.

1006.1008.1009 are mirrors for folding back, 1007 is a projection image of the film 1002 on the screen 1
This is a mirror for switching between the 001 side and the sensor +010 side. When the mirror 1007 is in the R position, the image of the film 1002 is projected onto the screen 1001, allowing visual confirmation and operations such as trimming. When the mirror 1007 is switched to the P position, the film 100
2 is projected onto a reading sensor 1010, and in the case of a line sensor, the image information can be read by sub-scanning in a direction perpendicular to the sensor alignment direction or by scanning mirrors 1006 and 1009. It is now possible to do so. Reference numeral 1011 is an electric block for reading image information, and its output is connected to a printer (not shown) to obtain a print.

[Problem to be solved by the invention]

However, in the conventional example, a means for switching the optical system between the viewer side and the sensor side, such as a mirror, is required, an actuator is required, the structure is complicated, and problems are likely to arise in terms of durability. In addition, a high-precision mirror for the viewer is required, and in order to brighten the screen, a large amount of light is required from the illumination lamp, and negative film images cannot be reversed and are difficult to use. Met. An object of the present invention is to provide an image reading device that solves the above problems.

(Means for Solving the Problems) The present invention includes a one-dimensional photoelectric conversion means, a projection means for projecting a transparent original image onto the photoelectric conversion means, and a sub-scanning body for sub-scanning the one-dimensional photoelectric conversion means. The image reading device is characterized in that a two-dimensional photoelectric conversion means is provided integrally with the sub-scanning member.

[Function] According to the present invention, for example, a member for sub-scanning a line sensor for image reading and an area sensor for an electronic viewer are integrally provided, and the viewer/reader is controlled according to the position of the sub-scanning section. It is designed to switch states.

(Example〕 The present invention will be described in detail below with reference to the drawings.

Figure 1 shows an embodiment of the present invention, in which the transmission thickness fA of a 35m1 color negative film, color positive film, etc. is projected, the projected image is read by a photoelectric conversion means such as a CCD line sensor, and the transmission thickness fA is converted into an electrical signal. FIG. 2 is a configuration diagram of main parts of a reading device.

Light emitted from the halogen lamp 1 passes through a condenser lens 2 and a field lens 3, and illuminates a transparent original 4. The projected image of the transparent original 4 is then projected by the projection lens 5.
An image is formed on the scanning plane of the CCD 6. The image is read by sub-scanning the CCD 6 in the direction of arrow d. , CCD 6 outputs the image of the transparent original as an electrical signal by photoelectrically converting the transmitted light from the transparent original, and is composed of, for example, a CCD line image sensor.

Reference numeral 8 denotes a sub-scanning body including a driving circuit for the CCD 6, which is mechanically driven in sub-scanning in a direction perpendicular to the line direction of the sensor by a stepping motor (not shown), etc.
Two-dimensional image information is thereby obtained.

8A indicates the position of the CCD 6 when the image is scanned exactly at the center of the sub-scanning, and 8B indicates the position of the scanning body at the home position (hereinafter abbreviated as IP).H
When reading an image with the CCD6 sensor, the P position needs to keep the sub-scanning speed constant, so it is the start position of the mechanical run-up for that purpose, and it is also the reference point for the image information read multiple times. This position is also the scanning reference position of the scanning body.

Reference numeral 9 denotes a position sensor such as a photointerrupter that detects whether the scanning object is at the IP position. Reference numeral 7 denotes a two-dimensional photoelectric conversion element provided to visually confirm the image of the transparent original 4 with a display device 13 such as a liquid crystal or CRT before actually reading the image, and is, for example, a COD area sensor. It is integrally constructed. Then, the scanning body 8
When the transparent original 4 is in the position, the transparent original is projected onto the area sensor 7, and at this time, the projection magnification is corrected so that the entire screen of the transparent original 4 matches the size of the area sensor 7. (This will be explained in FIGS. 2 and 3).

Also, it is possible to set up an area sensor projection position other than the IP position, but it requires a separate position sensor, and operations such as viewer confirmation, image reading, or bliscanning by the CCD 6 sensor before image reading. The switching time becomes longer. ) By matching the IP position and the viewer confirmation position, scanning of the scanning object such as image reading can be started immediately after the viewer confirmation.

10111.12 is a mirror for turning back, and 13 is a part of the operation key for operating this device.

Since this device needs to read a transparent original 4 having different color characteristics such as a negative film and a positive film, an NO filter 14 and a cyan filter 15 are installed in the optical path so that they can be moved in and out of the optical path in the direction of arrow a. . In the case of reading a negative film, a cyan filter 15 is required to correct the base color of the negative film. Therefore,
When using the same lamp light path, the amount of light that passes through negative film is reduced by the density of (base) + (cyan filter) compared to positive film.

To equalize the conditions for this purpose, an ND filter 14 having a density equivalent to (base) + (cyan filter) is used when reading a positive film.

Further, a filter 16 is used to correct the difference in the amount of light required due to the difference in sensitivity between the Cf:D6 and the area sensor 7. Although it is possible to provide it immediately before the sensor 6 or 7, it is advantageous to reduce the amount of light hitting the film surface as much as possible to prevent discoloration of the film. This is effective because visual confirmation by the viewer tends to take a long time. However, by using a memory (semiconductor memory, etc.) for storing image data using an area sensor, it is possible to shorten the viewer's temporary irradiation time to a fixed time for memory acquisition, and in this case, the filter-driven actuator and space can be reduced. Since it is not necessary, it can be placed somewhere in the projection optical system.

FIG. 7 shows the basic circuit configuration for display on a CRT. The image signals R, G, and B read by the area sensor 7 are
Each amplified 8/D (Analog/Digital)
It is converted to/D by the converter 701 and sent to the address counter 70.
The data is written to the RAM 702 managed by the computer 5. When displaying, the data is read from there, converted to D/A by a D/A (digital/analog) converter 703, and then sent to a CRT unit 704 where it is displayed.

The entire electrical image reading operation is shown in the flowchart of FIG. First, operate according to the above steps f801, 802)
, is displayed on the display unit (803), and the user selects an initial setting. If you want to trim within it (804
), frame designation is set 805), the address counter 705 in FIG. 7 is controlled according to the settings, and the trimmed image is displayed on the CRT (see FIG. 9). If you finish cropping or don't do it, then enlarge it,
Select settings such as reduction, edge emphasis, smoothing, density adjustment, etc. (8061. After that, the image reading operation begins with the user's operation. The original film is projected onto the line sensor, the image is read by operating the sensor, and the RlG , B
Obtain the analog signal of (807J. After converting it by ^10, engrave it into R, G, B digital image signal and apply dark correction 3027), Apply shading correction to the dark correction signal 3028), Shading Correctly correct pixel shift in the main scanning direction with respect to the correction signal 3029
), convert the R, G, and B signals after pixel misalignment correction into color signals such as Y (yellow), M (magenta), and C (cyan) according to the output device (3030), and then perform LOG conversion or γ conversion. 3031), masking process 3034
), performs undercolor removal processing 3035), and converts the recording density to a specified density (3038).
Conversion processing is performed to the specified scaling factor (3037), and output is performed (808).

FIGS. 2 and 3 show the relationship between the projection state of the transparent original 4 and the state of the scanning body, and the same reference numerals as in FIG. 1 are used to indicate the same reference numerals.

7A is a connector that connects the area sensor 7 and a drive circuit that is integrated with the scanning body 8; It is provided so as to coincide with the imaging plane of No. 4. 7C is a support stand for the lens 8. Figure 2 is CC
D 6 shows a state where the projection image is at the center of reading. FIG. 3 shows the projection state when the scanning body is in the IP position. In this embodiment, the projection magnification in Fig. 2 is set so that the 35+am film is imaged on the line sensor 6 of about 15a+m 5000 pixels, but the area sensor is usually It is produced as an imaging device for televisions, and is used as an area sensor 7.
If you try to use it as a camera, you will only be able to monitor a portion of the projected image due to the difference in sensor size. Therefore, by providing a magnification correction means as shown in FIG. 3, it is possible to monitor the entire screen with an area sensor.

4 and 5 show an example in which a means 70 for correcting the amount of light by correcting the difference in sensitivity between the sensors 6 and 7 or the magnification is provided immediately before the sensor 7. It goes without saying that the location of the light correction means needs to be provided in the projection system of the sensor 6, depending on the sensor, driving conditions, etc.

It goes without saying that as the magnification correction means, a known method such as using a zoom lens as the projection lens 5 can be applied.

(Effects of the Invention) As explained above, according to the present invention, the characteristics of an electronic viewer such as reversing a negative image can be exhibited, and the optical system can have a simple configuration, and a switching drive means is not required (which reduces durability). improvement), flexibility in the layout within the device, cost reduction, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main part of the embodiment of the present invention, FIGS. 2 and 3 are diagrams showing the projection relationship and the positional relationship of the scanning body, and FIGS. 6 is an explanatory diagram of a conventional example, FIG. 7 is a CRT display circuit diagram, FIG. 8 is a flowchart of image reading operation, and FIG. FIG. 9 is an explanatory diagram of trimming. DESCRIPTION OF SYMBOLS 1... Illumination lamp, 4... Transmission original, 5... Projection lens, 6... CCD sensor, 7... CCO area sensor, 8... Sub-scanning body.

Claims (1)

[Scope of Claims] 1) It has a one-dimensional photoelectric conversion means, a projection means for projecting a transparent original image onto the photoelectric conversion means, and a sub-scanning body for sub-scanning the one-dimensional photoelectric conversion means. An image reading device characterized in that a two-dimensional photoelectric conversion means is provided integrally with the sub-scanning body. 2) The image reading device according to claim 1, wherein the image reading device is configured such that a transparent original image is projected onto the two-dimensional photoelectric conversion means at a sub-scanning start position of the sub-scanning body. 3) The image reading apparatus according to claim 1, further comprising means for correcting a projection magnification when a transparent original image is projected onto the two-dimensional photoelectric conversion means. 4) The image reading device according to claim 3, wherein the projection magnification correction means is provided integrally with the sub-scanning body.