JP2003234877A - Image reader, image reading method, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily align a transmitting original illumination device and a reading optical unit. <P>SOLUTION: An image reader for reading out image information from an original by synchronously scanning the original in a sub-scanning direction by a light source unit having at least one light source for irradiating the original with light and an image reading unit having a photoelectric conversion part for receiving light from the original and photoelectrically converting the received light in the sub-scanning direction, is provided with an area determination part 202 for determining an image reading area for positioning at the time of positioning a main scanning direction approximately rectangular to the sub- scanning direction of the light source unit and the image reading unit. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reading image information on a transparent original such as a photographic film by photoelectric conversion means.

[0002]

2. Description of the Related Art In recent years, with the development of communication networks, the speeding up of computers, and the increasing capacity of storage media, higher image quality has come to be demanded in handling color image information. In the case of reading color image information by, for example, there is an increasing demand for more accurate, high-speed and high-quality reading.

Further, in reading an image on a photographic film, there is an increasing demand for more accurate, high-speed and high-quality reading of sleeve-shaped photographic film image information having a plurality of frames. As a means for reading a film with higher image quality, there has been proposed an image reading apparatus having a means for removing dust and scratches on the film, and one example thereof is JP-A-2001-298593. According to the proposal, a light source having an infrared LED for detecting dust and scratch information and a light source for reading image information is configured as a surface light source, and an image with reduced influence of dust and scratches can be read. It is possible.

However, since the illumination efficiency is low in the indirect illumination system as the surface light source, a means for synchronously moving the illumination system and the optical system is known as a means for performing reading at higher speed and higher image quality. Examples of methods for controlling the illumination system and the optical system include the method disclosed in Japanese Patent Laid-Open No. 10-004481. According to the technique described in this publication, it is possible to reduce the influence of synchronization failure or the like caused by the positional deviation between the illumination system and the optical system as much as possible.

A form related to this publication is shown in FIGS.
A brief description will be given with reference to FIG.

FIG. 14 is a diagram showing an example of an image input device capable of reading a document original or the like and a photographic film. FIG. 15 is a diagram showing a state in which a fixing member for fixing the photographic film when the photographic film is read is mounted on the image reading apparatus shown in FIG.

The image reading apparatus 1 is provided with a transparent original illuminating device 2 required for reading a transparent original such as a photographic film, and a transparent original light source lighting inverter so that it can be controlled by the image reading apparatus control board 3. 7 and I / F cable 15
Are electrically connected by. The transparent original illumination device 2 includes a transparent original illumination unit 18 having a transparent original light source 4 for reading a transparent original. Also,
The optical unit 14 reflects the first reflection mirror 9, the second reflection mirror 10, the third reflection mirror 11, the lens 12, the document, and the like necessary for optically forming an image of the transmission original on the CCD image sensor 13. It has a reflection original illumination light source 8 for illuminating an original, and is configured to read an image while scanning in the direction of the arrow (sub-scanning direction) shown by the image input device control board 3 and the motor 16.

The CCD image sensor 13 and the image input device control board 3 are electrically connected by a signal cable 17, and a motor 16 scans the transparent original illumination unit 18 and the optical unit 14 in synchronization with each other. The electric signals photoelectrically converted by the CCD image sensor 13 can be acquired as image data. A transparent glass or a diffusing material is used for the transmissive plate 19 installed in the transmissive original illumination device 2 interposed between the transmissive original illumination unit 18 and the film guide 5 on the original table glass 6.

When reading a transparent original such as a film,
The film is fixed by the film guide 5 placed on the platen glass 6. As shown in FIG. 15, the film guide 5 is provided with a calibration area S for calibrating the irradiation light from the transparent original light source 4. A shown in FIG. 15 indicates one frame of photographic film.

FIG. 16 is a diagram showing an optical alignment method required for scanning the transparent original illumination unit 18 and the optical unit 14 in synchronization with each other.

In advance, the optical unit 14 is moved to a position corresponding to the calibration area S provided on the film guide 5 installed at a predetermined position, and the transparent original illumination unit 18 is moved to a distance before the image reading is started. Only D is scanned in the direction of the arrow, and the positions where the light output is maximum or the positions effective for reading the film are searched for at positions a and a ′ at both ends of the calibration area S. At the time of reading an image, by always maintaining the positional relationship and scanning, it is possible to read a high-quality image at high speed.

[0012]

However, in the above method, for example, when the transmission original illumination unit 18 and the optical unit 14 are not correctly parallel,
This is effective when the range of uniform light amount distribution in the sub-scanning direction is wide as shown in FIG. 17A, but is narrow when the range of uniform light amount distribution in the sub-scanning direction is narrow as shown in FIG. 17B. In this case, the positions at which the optical output is maximum deviate between the position a and the position a ′, which cannot be dealt with.

That is, when the optical system and the illumination system are arranged with a large inclination in the main scanning method, the light source needs to have a sufficiently uniform light amount distribution, which causes a reduction in the illumination efficiency at the reading position. . Alternatively, it is required that the positions a and a ′ in the calibration area S are accurately arranged so that there is no difference in the light amount distribution in the sub-scanning direction, resulting in an increase in cost.

The light source is a cold cathode lamp (hereinafter CCFL).
For light sources that require a Warm up time, such as
If the m up time is not completely completed, the illumination system and the optical system cannot be accurately aligned. Therefore, the preprocessing time for image reading increases. Further, when it is required to read a plurality of frames or when intermittent reading frequently occurs due to communication reasons, accuracy is required so as not to cause a positional shift, and thus problems such as cost increase remain.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object thereof is to facilitate the alignment of the transmission original illuminating device and the reading optical unit.

Another object of the present invention is to shorten the preprocessing time in image reading.

[0017]

[Means for Solving the Problems]
In order to achieve the object, an image reading apparatus according to the present invention includes a light source unit having at least one light source for irradiating a document with light, and a photoelectric conversion unit that receives light from the document and photoelectrically converts the light. An image reading device for reading image information on the original by scanning the image reading unit having the image reading unit in synchronization with the original in the sub-scanning direction, wherein the sub unit of the light source unit and the image reading unit is provided. It is characterized in that it is provided with a region determining means for determining an image reading region for the alignment when performing alignment in the main scanning direction substantially orthogonal to the scanning direction.

Further, in the image reading apparatus according to the present invention, the area for reading the image is smaller than the irradiation area of the light source in the sub-scanning direction.

In the image reading apparatus according to the present invention, the light source unit has a plurality of light sources, and at least one of the lights emitted from the plurality of light sources is infrared light or white light. It has a feature.

Further, in the image reading apparatus according to the present invention, the light source unit has a plurality of light sources, and at least one of the plurality of light sources is a light source that is turned on when the alignment is performed. It has a feature.

In the image reading apparatus according to the present invention, the light source unit has a plurality of light sources, and at least one of the plurality of light sources is a light source that is turned on when detecting a defect on the original. It is characterized by being.

Further, the image reading apparatus according to the present invention has the first and second characteristics different from each other for irradiating the original with light.
A light source unit having a light source and an image reading unit having a photoelectric conversion unit that receives light from the original and photoelectrically converts the light, by scanning the original in synchronization with the sub-scanning direction. An image reading apparatus for reading image information on a document, the image reading unit using light from the first light source when a light amount distribution of the second light source is wider than that of the first light source. It is characterized by further comprising sub-scanning direction alignment means for aligning the light source unit and the image reading unit in the sub-scanning direction based on the image information read in.

Further, in the image reading apparatus according to the present invention, the first light source has a light amount rising earlier than that of the second light source.

Further, in the image reading apparatus according to the present invention, the first light source is an infrared LED or a white LED.

In the image reading apparatus according to the present invention, the light source unit has a plurality of light sources, and at least one of the plurality of light sources is a light source that is turned on when detecting a defect on the original. It is characterized by being.

Further, the image reading apparatus according to the present invention is an image having a light source unit having at least one light source for irradiating a document with light and a photoelectric conversion means for receiving light from the document and performing photoelectric conversion. An image reading device for reading image information on the original by scanning the reading unit in synchronization with the original in the sub-scanning direction, wherein the light source unit and the image reading unit are relative to each other. It is characterized by further comprising sub-scanning direction alignment means for performing alignment of the light source unit and the image reading unit in the sub-scanning direction based on an output signal when the original is irradiated while being moved to.

Further, in the image reading apparatus according to the present invention, the light source unit has a plurality of light sources, and the alignment in the sub-scanning direction is performed according to respective output signal peak values corresponding to lighting of the plurality of light sources. It is characterized by performing.

Further, in the image reading apparatus according to the present invention, the light source unit has a plurality of light sources, and the alignment in the sub-scanning direction is performed according to respective output signal waveforms corresponding to lighting of the plurality of light sources. The feature is to do.

Further, in the image reading apparatus according to the present invention, the light source unit has a plurality of light sources, and at least one of the plurality of light sources is turned on when detecting a defect on the light transmissive original. It is characterized by being a light source.

Further, the image reading method according to the present invention is an image having a light source unit having at least one light source for irradiating a document with light and a photoelectric conversion means for receiving light from the document and performing photoelectric conversion. An image reading method for reading image information on the original by scanning the reading unit in synchronization with the original in the sub-scanning direction, wherein the sub-scanning direction of the light source unit and the image reading unit When performing alignment in the main scanning direction that is substantially orthogonal to, a region determination step of determining an image reading region for the alignment is provided.

In the image reading method according to the present invention, the first and second characteristics for irradiating the original with light are different from each other.
A light source unit having a light source and an image reading unit having a photoelectric conversion unit that receives light from the original and photoelectrically converts the light, by scanning the original in synchronization with the sub-scanning direction. An image reading method for reading image information on an original document, wherein the image reading unit uses light from the first light source when a light amount distribution of the second light source is wider than that of the first light source. A sub-scanning direction alignment step of aligning the light source unit and the image reading unit in the sub-scanning direction on the basis of the image information read in.

In the image reading method according to the present invention, a light source unit having at least one light source for irradiating a document with light, and a photoelectric converter for receiving and photoelectrically converting light from the light source that has passed through the document. An image reading method for reading image information on the light-transmissive original by scanning the original with an image reading unit having a conversion unit in a sub-scanning direction in synchronization with the original. A sub-scanning direction alignment step of aligning the light source unit and the image reading unit in the sub-scanning direction based on an output signal when the document is irradiated while moving the image reading unit relatively. It is characterized by having.

A program according to the present invention is characterized by causing a computer to execute the above-mentioned image reading method.

A storage medium according to the present invention is characterized by storing the above program in a computer-readable manner.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
6 is a block diagram showing a configuration of an image reading apparatus control system using a sub-scanning alignment method for the transmission original illumination unit 18 and the optical unit 14 according to the embodiment of FIG. In this embodiment, the configuration of the image reading device is substantially the same as that of the conventional example shown in FIG.

In FIG. 1, the image reading apparatus control system as a whole includes an image reading apparatus 1 and a transparent original illuminating apparatus 2.
And an alignment control unit 201 and an image processing device 206. The image reading device 1 and the transparent original illuminating device 2 controlled by the image reading device control unit 205
Reads a predetermined image when reading a film original, and the image is temporarily processed by the image processing apparatus from the main-scanning alignment area determining unit 202 via the first sub-scanning position determining unit 203. The transmission original illuminating device 2 and the optical unit 14 are aligned based on the information. Further, the second sub-scanning position determining unit 204 performs the alignment again based on the image information from the image reading device 1 and the transmission original illuminating device 2, and the final image information can be acquired.

Further, in this control system, the main scanning position alignment determining section 202 is not provided, the first sub-scanning position determining section 203 is not provided, or the second sub-scanning position determining section 204 is not provided. Including the above, only one of the alignment parts is valid. The image reading device 1 and the transparent original illuminating device 2 are the same as those described in the conventional example, and therefore description thereof will be omitted.
Further, the image processing device 206 is a device that processes known image information, and therefore its description is omitted.

First, the main-scanning alignment section 202 is a means for solving the alignment failure due to the inclination of the optical unit 14 and the transmission original illumination unit 18 described in the conventional example.

The main scanning alignment area determining unit 202 will be described with reference to FIG. FIG. 2 is an enlarged view of the vicinity of the film A of the film guide 5 described in FIG.

By aligning the main scanning width SA1 required for the image reading area RA for reading the image information of the film A in the calibration area S, the alignment is performed at the positions a and a'in FIG. The main scanning width can be made shorter than the above. Therefore, it is obvious that the influence of the inclination between the transmissive original illumination unit 18 and the optical unit 14 and the influence of the light amount distribution can be reduced, and the cost is not increased.
It is possible to realize a more efficient lighting device.

Next, the first sub-scanning position determining unit 203
When a plurality of light sources are required, the alignment is performed by using only one of the light sources. Further, among the plurality of light sources, the one having an LED light source is LE.
This is a means that enables faster and more accurate alignment by performing alignment with the D light source.

Regarding the first sub-scanning position determining section 203,
This will be described with reference to FIGS. 3, 4, 5, and 6. Figure 3
FIG. 3 is a view of the transparent original illuminating device 2 as seen from the film installation side, and includes a transparent original illuminating unit 28 having an infrared LED 27 for detecting dust and scratches on the film and a light source 4 for reading image information.
Is shown. The infrared LED 27 and the light source 4 are arranged substantially in parallel. FIG. 4A is a diagram showing a case where the light source 4 for reading the image information is aligned at the substantially maximum position of the light amount distribution. FIG. 4B is a diagram showing a case where the infrared LED 27 for detecting dust and scratches is aligned at a substantially maximum position of the light amount distribution. In addition, FIG.
Is the light amount distribution in the light source 4, and FIG.
An example of the light amount distribution in D27 is shown.

There is a physical distance between the infrared LED 27 and the light source 4, which is indicated by substantially d. In addition, the distance from the position where the light source 4 of FIG.
If the distance from the combined position of the infrared LED 27 in FIG. 4B to the light source 4 is D2, the light amount distribution in the infrared LED 27 is as shown in FIG. Since the characteristic of a region having a uniform width narrower than that of the light intensity distribution is shown, the relationship normally expressed by the equation (1) is established.

| D-D1 | ≧ | d-D2 | (1) The expression (1) shows that if the infrared LED 27 performs the alignment, the light source 4 does not perform the alignment.
This means that the alignment at the light source 4 can be completed only by moving the distance of a predetermined amount d.

FIG. 6 is a diagram showing a change in the amount of light immediately after the LED and CCFL are turned on. For example, if the light source 4 is a CCF
When it is composed of L, as shown in FIG. 6, the time required for the light quantity to stabilize after lighting is CCF for the LED.
It is much shorter than L. That is, the light amount rises quickly. From these meanings as well, when the infrared LED 27 and the light source 4 are included, the infrared LED 27 performs lighting and alignment processing, thereby enabling faster and optimal alignment. Therefore, it is effective to use the LED for alignment, not the infrared LED for dust detection, especially when the light source 4 is composed of white, or R, G, B color LEDs. Is also an effective means.

Next, the second sub-scanning position determining unit 204
This is a means that can prevent a positional shift that tends to occur between the optical system 4 and the transmissive original document illumination unit 18 in the case of reading a plurality of films and the problem of the prior art, or in the case of intermittent reading.

The second sub-scanning position determining unit 204 will be described with reference to FIGS. 7, 8 and 9. FIG. 7 is an enlarged view of the vicinity of the film A of the film guide 5 described in FIG. Image reading area RA for reading the image information of the film A
Prior to reading, the above-described alignment is performed in the inter-film-frame area BA. FIG. 8 shows R in the area BA.
It is a figure showing an example of an output distribution in the sub-scanning direction for each color of GB. Peak output BAr, BA for each color
g and BAb can be easily detected by the averaging process, and the alignment is performed in the inter-film-frame area BA with reference to this value. FIG. 9 shows a flowchart for determining the second sub-scanning position.

In FIG. 9, in step S200, the optical system unit 14 is first fixed and the illumination unit 28 is scanned back and forth (sub scanning direction). This results in step S2
In 01, the histogram of FIG. 8 is created. Step S
At 202, it is determined whether or not the peak values of BAr, BAg, and BAb match at the position in the sub-scanning direction. When BAr, BAg and BAb are detected in step S202, the process proceeds to step S203.
In step S203, alignment is performed so that the peak value is the same as the position in the sub-scanning direction. When the peak values match, it is considered that the film is in the base concentration region of the film, and the base information is BAr, BAg, BA.
In b, the alignment control is performed. However, if the peak values are the same even in the non-base density region, it is considered that the image information on the film is not affected, and therefore the alignment control can be performed. BAr, BAg, BAb in step S202
If is not detected, the initial position alignment position is not changed in step S204. In this case, it is difficult to determine which peak value does not match. In step S205, the film reading area RA
The positions of the optical system unit 4 and the transmission original illuminating unit 18 for reading are updated.

It is also possible to compare and determine the result of alignment based on the base information and the alignment of the initial value to update the final position. It is also possible in the transmissive original illumination unit 28 having a plurality of light sources. Further, even if the three colors of BAr, BAg, and BAb described in FIG. 8 are not used, any one signal may be used, or the infrared LE may be used.
Control is also possible by using a signal corresponding to the light emission of D27. Further, in addition to the method of performing the alignment before reading the film, it is also effective to perform the alignment after reading the image information of each frame when reading a plurality of frames. Further, it is possible to perform the alignment by referring to the base information at the end of the film while reading the film.

Further, in the above embodiment, the judgment is made on the basis of whether or not the peak values of the waveforms match each other (see step S202), but it is not necessary that they are completely matched. It is sufficient if it is within the predetermined range. Further, whether or not the waveforms match with each other may be used as a criterion for determination based on the waveform of the histogram.

As described above, according to this embodiment, it is possible to construct a more efficient lighting device without increasing the cost.

(Second Embodiment) Main-scanning alignment section 2
A second embodiment of No. 02 will be described with reference to FIG. FIG. 10 is an enlarged view of the vicinity of the film A of the film guide 5 described in FIG. Regarding the main scanning width SA2 which is necessary for the image reading area RA for reading the image information of the film A and covers approximately two film positions,
Positioning is performed in the calibration area S. Even in this case, as in the first embodiment, a, a ′ in FIG.
The main scanning width can be made shorter than that at the position of. Therefore, it is clear that the influence of the inclination between the transmissive original document illumination unit 18 and the optical unit 14 and the light amount distribution can be reduced, and the form of the illumination device with higher efficiency can be configured without increasing the cost. Further, in the case of the present embodiment, it is possible to omit the position alignment processing in the image reading of the film for two rows corresponding to the area SA2.

(Third Embodiment) Another form of the first sub-scanning position determining unit 203 will be described with reference to FIG. FIG. 11 is a view of the transparent original illuminating device 2 as seen from the side where the film is installed. The transparent original illuminating unit 2 has an infrared LED 29 for detecting dust and scratches and a light source 4 for reading image information.
8 is shown. The infrared LED 29 and the light source 4 are arranged substantially in parallel.

In the present embodiment, the specific main scanning position bb '
A transparent original illuminating device 32 in which an infrared LED 29 for removing dust and scratches is arranged is used only in the above. When the infrared LED 29 and the light source 4 are provided, the main scanning width is approximately b− as in this embodiment.
Even with the infrared LED 29 only for b ′, it is only required to have an accuracy enough to maintain the stability of a sufficient light amount distribution in the image reading outside bb ′, and it is possible to perform faster and optimal alignment. Can be done. Therefore, it is an effective means not only as an infrared LED for detecting dust and scratches but also as an LED for alignment, especially when the light source 4 is composed of white, or R, G, B color LEDs. It is an effective means.

(Fourth Embodiment) Another form of the second sub-scanning position determining unit 204 will be described with reference to FIGS. FIG. 12 is an enlarged view of the vicinity of the film A of the film guide 5 described in FIG. Before reading the image reading area RA for reading the image information of the film A,
The alignment is performed in the area CA between the film frames. FIG. 13 is a diagram showing an example of the output distribution in the sub-scanning direction for each of the RGB colors in the area CA. In FIG. 12, RBr of each color, which is the image data including the image area in FIG.
RBg, RBb, and peak outputs BAr, BAg, BAb as base information can be easily detected by histogram analysis and averaging processing.
The alignment is performed in the area CA between film frames with reference to.

Note that BAr and BA explained in FIG.
The control can be performed by using any one signal or by using a signal associated with the light emission of the infrared LED 27, instead of the three colors of g and BAb.

Further, in addition to the method of performing the alignment before reading the film, the alignment may be performed after reading the image information of each frame when reading a plurality of frames. Further, it is possible to perform the alignment by referring to the base information at the end of the film while reading the film.

As described above, according to this embodiment, it is possible to construct a more efficient lighting device without increasing the cost.

As described above, according to the above-described first to fourth embodiments, it is possible to perform the alignment between the transmission original illumination unit and the optical unit with the minimum main scanning width required for reading. The accuracy of the configuration can be reduced, and the transmissive original document illumination unit can be configured with high light output illumination efficiency.

Further, by performing the alignment processing with the LED light source that requires almost no warm-up time and moving to the physically determined position of the image reading light source by a predetermined amount, the preprocessing time in the image reading is obtained. Can be shortened.

Further, by re-correcting the alignment process by utilizing the frames between one or a plurality of films,
Optimal alignment can be achieved without increasing the cost and without returning to the shading area.

[0063]

Other Embodiments The purpose of each embodiment is to supply a storage medium (or recording medium) recording a program code of software for realizing the functions of the above-described embodiments to a system or apparatus, It is needless to say that this is also achieved by the computer (or CPU or MPU) of the device reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention. Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) running on the computer based on the instructions of the program code. Do some or all of the actual processing,
It goes without saying that the processing includes the case where the functions of the above-described embodiments are realized.

Furthermore, after the program code read from the storage medium is written in the memory provided in the function expansion card inserted in the computer or the function expansion unit connected to the computer, based on the instruction of the program code. Needless to say, this also includes a case where a CPU or the like included in the function expansion card or the function expansion unit performs a part or all of the actual processing and the processing realizes the functions of the above-described embodiments.

When the present invention is applied to the above storage medium, the storage medium stores the program code corresponding to the procedure described above.

[0066]

According to the present invention, the alignment of the transmission original illumination unit and the optical unit necessary for image reading can be accurately performed in a shorter time, so that the accuracy of the configuration can be reduced and the illumination can be performed. It is possible to configure an efficient transparent original illumination unit, and it is possible to read a high-quality image at high speed without increasing the cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an image reading device control system according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a film guide for explaining the first embodiment of the present invention.

FIG. 3 is a schematic view of a transparent original illuminating device for explaining the first embodiment of the present invention.

FIG. 4 is a diagram for explaining alignment of a transmissive original illumination unit and an optical system for explaining the first embodiment of the present invention.

FIG. 5 is a diagram showing a light amount distribution of a transmissive original illumination unit for explaining the first embodiment of the present invention.

FIG. 6 is a diagram showing a light quantity change of a light source for explaining the first embodiment of the present invention.

FIG. 7 is an enlarged view of a film guide for explaining the first embodiment of the present invention.

FIG. 8 is a diagram showing a film-based histogram for explaining the first embodiment of the present invention.

FIG. 9 is a control flowchart for explaining the first embodiment of the present invention.

FIG. 10 is an enlarged view of a film guide for explaining the second embodiment of the present invention.

FIG. 11 is a schematic view of a transparent original illuminating device for explaining a third embodiment of the present invention.

FIG. 12 is an enlarged view of a film guide for explaining a fourth embodiment of the present invention.

FIG. 13 is a diagram showing a film-based histogram for explaining the fourth embodiment of the present invention.

FIG. 14 is a diagram showing a configuration of an image reading apparatus for explaining a conventional example.

FIG. 15 is a diagram showing a film guide for explaining a conventional example.

FIG. 16 is a diagram showing the alignment of a transmission original illumination unit and an optical system for explaining a conventional example.

FIG. 17 is a light amount distribution diagram of a transmissive original illumination unit for explaining a conventional example.

[Explanation of symbols]

1 Image Reading Device 2 Transparent Original Illumination Device 3 Image Reading Device Control Board 4 Transparent Original Light Source 5 Film Guide 6 Original Plate Glass 7 Transparent Original Illumination Lamp Inverter 8 Reflected Original Illumination Light Source 9 First Mirror 10 Second Mirror 11th 3 Mirror 12 Lens 13 CCD Image Sensor 14 Optical System Unit 15 I / F Cable 16 Motor 17 Signal Cable 18 Transmission Original Illumination Unit 19 Transmission Plate a Calibration Area Inner End Position a ′ Calibration Area Inner End Position S Calibration Positioning area A Film position D for one frame Positioning movement direction 201 Positioning control means 202 Main scanning positioning area determining means 203 First sub-scanning position determining means 204 Second sub-scanning position determining means 205 Image reading device control means 206 image processing device RA image information reading area SA Position and infrared L after the positioning by the distance D1 image reading light source for transmitting selection lighting units d the infrared LED and an image reading light source including a main scanning registration area 27 infrared LED 28 a plurality of light sources
Distance from ED D2 Distance between the position after infrared LED alignment and image reading light source LED LED light source CCFL Cold cathode lamp BA Base information detection area BAr R color signal BA base area G color signal BAb base area B color signal SA2 in the main scanning alignment area b Infrared LED edge position b'Infrared LED edge position 32 Transmission original illumination device CA Base information detection area RBr Base R information image signal RBg base in the information detection area G color image signal RBb in the information detection area B color image signal in the base information detection area

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 1/10 H04N 1/10 1/107 F term (reference) 2H106 AB15 AB35 AB46 2H109 AA02 AA13 AA15 AA24 AA26 AB41 DA00 5B047 BA02 BB02 BC02 BC05 BC09 BC12 BC15 CA17 CB04 CB09 CB12 DC04 DC07 5C072 AA01 BA04 CA05 CA07 CA09 DA02 DA04 DA21 EA05 LA20 MB04 RA20 VA03

Claims (18)

[Claims] 1. At least one for illuminating a document.
By scanning a light source unit having two light sources and an image reading unit having photoelectric conversion means for receiving light from the document and performing photoelectric conversion on the document in synchronization with the document in the sub-scanning direction, the document is scanned. An image reading device for reading image information of the image reading device, which reads an image for the position adjustment when the light source unit and the image reading unit are aligned in a main scanning direction substantially orthogonal to the sub-scanning direction. An image reading apparatus comprising area determining means for determining an area. 2. The image reading apparatus according to claim 1, wherein an area for reading the image is smaller than an irradiation area of the light source in the sub-scanning direction. 3. The light source unit has a plurality of light sources,
At least one of the lights emitted from the plurality of light sources is infrared light or white light.
Alternatively, the image reading device described in 2. 4. The light source unit has a plurality of light sources,
The image reading apparatus according to claim 1, wherein at least one of the plurality of light sources is a light source that is turned on when the alignment is performed. 5. The light source unit has a plurality of light sources,
The image reading apparatus according to claim 1, wherein at least one of the plurality of light sources is a light source that is turned on when detecting a defect on the document. 6. An image reading unit having a light source unit having first and second light sources having different characteristics for irradiating a document with light, and a photoelectric conversion unit for receiving and photoelectrically converting light from the document. An image reading device for reading image information on the light-transmissive original by scanning the original in synchronization with the original in the sub-scanning direction, and a second light source rather than the first light source. The light source unit and the image reading unit are aligned with each other in the sub-scanning direction based on the image information read by the image reading unit using the light from the first light source when the sub-scanning direction is wide. An image reading apparatus comprising a scanning direction alignment means. 7. The image reading apparatus according to claim 6, wherein the first light source has a light amount rising earlier than that of the second light source. 8. The image reading apparatus according to claim 6, wherein the first light source is an infrared LED or a white LED. 9. The light source unit has a plurality of light sources,
The image reading apparatus according to claim 6, wherein at least one of the plurality of light sources is a light source that is turned on when detecting a defect on the document. 10. A light source unit having at least one light source for irradiating a document with light, and an image reading unit having photoelectric conversion means for receiving light from the document and performing photoelectric conversion on the document are provided for the document. An image reading device for reading image information on the document by scanning in synchronization with the sub-scanning direction, wherein the document is irradiated while the light source unit and the image reading unit are relatively moved. An image reading apparatus comprising: a sub-scanning direction alignment unit that aligns the light source unit and the image reading unit in the sub-scanning direction based on the output signal. 11. The light source unit has a plurality of light sources, and performs alignment in the sub-scanning direction according to respective output signal peak values corresponding to lighting of the plurality of light sources. The image reading device according to item 10. 12. The light source unit has a plurality of light sources, and performs alignment in the sub-scanning direction in accordance with respective output signal waveforms corresponding to lighting of the plurality of light sources. The image reading apparatus described in 1. 13. The light source unit has a plurality of light sources, and at least one of the plurality of light sources is a light source that is turned on when detecting a defect on the light transmissive original. The image reading device according to claim 10. 14. A light source unit having at least one light source for irradiating a document with light, and an image reading unit having photoelectric conversion means for receiving light from the document and performing photoelectric conversion on the document are provided on the document. An image reading method for reading image information on the original by scanning in synchronization with the sub-scanning direction by a scanning method, wherein a position of the light source unit and the image reading unit in a main scanning direction substantially orthogonal to the sub-scanning direction. An image reading method comprising an area determining step of determining an image reading area for the position alignment. 15. An image reading unit having a light source unit having first and second light sources having different characteristics for irradiating a document with light, and a photoelectric conversion unit for receiving light from the document and photoelectrically converting the received light. An image reading method for scanning image information on the light-transmissive original by scanning the original in synchronization with the original in the sub-scanning direction, and a second light source rather than the first light source. The light source unit and the image reading unit are aligned in the sub scanning direction based on the image information read by the image reading unit using the light from the first light source when the light amount distribution of An image reading method comprising a scanning direction alignment step. 16. A light source unit having at least one light source for irradiating a document with light, and an image reading unit having photoelectric conversion means for receiving and photoelectrically converting light from the light source that has passed through the document. An image reading method for reading image information on the light-transmitting original by scanning the original in synchronization with a sub-scanning direction, wherein the light source unit and the image reading unit are relatively arranged. An image reading method comprising: a sub-scanning direction alignment step of aligning the light source unit and the image reading unit in the sub-scanning direction based on an output signal when the original is irradiated while being moved. . 17. A program for causing a computer to execute the image reading method according to any one of claims 14 to 16. 18. A storage medium on which the program according to claim 17 is stored so that it can be read by a computer.