JPS58200668A - Picture reader - Google Patents

Abstract

PURPOSE:To perform shading correction with high accuracy, by arranging a common reference-density reflector for detecting the shading amount at a position belonging to neither of two scanning positions for reading an original. CONSTITUTION:When a fixed original 10a is read by the first original reading part 16a the shading amount is firstly read at a scanning position D0 for reading reference density from a reference-density reflector 32, and then the picture image of the original 10a is read at the first scanning position D1 for reading the original. When a moving original 10b is read at the second original readin part 16b, the shading amount is firstly read at the position D0 from the reflector 32, and then the original 10b is read at a fixed scanning position D2 for reading. The reflector is located at a position belonging to neither of positions D1 and D2. Therefore, the reading of the reference density is performed by one reflector 32 under the same condition. As a reuslt, the same correction effect is always obtained with better repetability by reading operation carried out by either of the reading parts 16a and 16b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a one-image correction device, and particularly to an image correction device having two original ellipse correction sections V and capable of performing document reading IIK shading correction for each.

Conventionally, in a IIi payment device used in a facsimile machine, etc., as illustrated in FIG.
An original document IR collecting part 161, and a second original document part TAB which can be sequentially removed from the contact glass 12 by the feed roller 14. There is.This one is 2
By having two document reading units xsat1 and bv, it is possible to read documents such as books, etc. It is very convenient because both a 1Gm original and a large number of Autumn Leaves Genfuku 10B can be stored in the IR. The cutting of the original ion or l□b is carried out using a cutting optical system 9 consisting of light @ul such as a fluorescent lamp, a mirror 20, and a light lens 4, and a one-dimensional image pickup device 26v such as a CCD. In the first original 111 reading unit isa which takes a fixed original 108, the reading scanning position by the image pickup device 26 moves due to the amm optical movement K, and the original 108 is read in a planar form. In addition, in the 20th original horizontal reading section 16b, which has a moving original 'm1ObY shape, its reading scanning position is fixed, and the horizontal part of the original 10b is moved and driven by the feed roller 14 or the like. It is done.

By the way, in this woodcutter's m*wL* device, light source 1
It is necessary to correct shading caused by non-uniformity in the light intensity distribution of the image forming lens 8, a decrease in peripheral light intensity of the imaging lens 22, uneven sensitivity of the image sensor, etc. Therefore, in the past, as shown in FIG. Original seed a section x 6m,
Reference density reflecting plates 301 and 30b are provided for each of the reference density reflectors 16b and 16b, respectively. Then, the original species 10M or 1obv [take and scan it! #! Prior to scanning, the reference density reflection plate 30a or 3ob is scanned to detect the shape f'47 in advance, and the correction circuit 28a or 28b is activated based on the detected shape amount.
It is possible to obtain a high-quality image employment signal Vo t' only from this K.

However, conventional -gII configured as
W1.4! The device first includes two original reading units 1611.
16b or individual reference density reflectors 30m, 30b
In order to use V, two reference density reflectors wa and aob are required, and two reference density reflectors 3 are required.
The reflection density of 0m and 3ob must be accurately (matched), otherwise the correction circuit 211Jl,
There was the trouble of having to prepare 281 type 28b. In addition, the second IIE Tachibana Kira Jun part lib
As for the reference density reflection [30b, which also serves as a source material guide, it easily rubs against the source material 10b and becomes dirty (for this reason, it is necessary to maintain the accurate reference density necessary for high precision shading correction. There was also the problem that the curve was too steep.

Furthermore, since the reading scanning position is fixed on the 20th original 4F14gIIR section 16b side, the reading scanning position with respect to the reference density reflector Wb is also fixed, and therefore the flLNL scanning position with respect to the reference density reflector 30bK is moved and compared. By averaging the reading results over a wide range, we can eliminate problems caused by local dirt, etc.
[It is also not possible to average and dilute the R error.

This invention has been made in view of the conventional time mv as described above, and its purpose is to provide a simple structure for the production of two original species wR and toribe during harvesting The purpose of the present invention is to provide an image acquisition device that can perform shape correction with high accuracy and maintain this high shading correction accuracy over a long period of time.In order to achieve the above objectives, This invention provides the first and second two points in the lie reading weir device as described above.
A common reference density reflector 'JIiv for detecting the amount of shading is provided at a position that does not belong to any of the original m reading scanning positions in the two document reading units, and the common reference density reflector 'JIiv' is provided to detect the amount of shading. Based on the shading tK, the first. It is assumed that each shading correction in the second original processing section is performed by 5K and t% mold.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. In addition, common or corresponding parts in each figure are marked with the same symbol V.
Figure ts2 (Jl) shows an embodiment of the image employment device according to the present invention.The device shown in the figure is
Its basic configuration is the same as the conventional one.

In other words, two originals III employment @ 1 to be able to fit the original species 1G11.10b v of 21111 respectively.
@a, has 16bt'. The one-dimensional image sensor temperature is WIt
Through the reading optical system, reading scanning is performed in the direction shown by the arrow Y in Fig. 2 (The reading scanning position is shown by the arrow X in Fig. 2). It is configured to move in a direction perpendicular to the reading scanning direction Y. When reading the fixed original 1031 using the first original reading unit l5aK, first,
The shading amount V is read from the reference density reflection plate 32 at the reference density reading scanning position D, and the fixed original 108108O' is read at the eLKLiO2 document reading scanning position Di. Also, the second document reading section 16bK moves the document 10b'@
When reading, the trap first starts from the reference density reading scanning position D.
The shading amount is removed from the reference density reflection plate 32 at @, and the moving original is moved to the fixed reading scanning position D2.
It is designed to read b. Here, the reference density reflecting plate 32 includes: a first. Second two document reading sections 16a, 1
6b K', this one reference concentration reflector 32 is provided for the first. Second two document reading units 1@m.

16b, and the shading amount necessary for shading correction is successively outputted. Scanning position DI.

In the position to which neither K of D2 belongs, that is, in the embodiment, both originals 1! It is located between the recesses 16 to 16b. Therefore, the first. Which of the second document reading sections 16m, 1
6b Even when performing one reading of a K"C original, the standard immersion level is determined by one common standard density reflection plate 32 under the same conditions before the reading. Or, even if you perform bladder removal in a lab, you can always obtain the same correction effect with ease.Moreover, in addition to the fact that there is only one standard concentration reflector 32, it is difficult to use. Based on the amount of shading taken by the WR (correction v?i), only one circuit section is required (this greatly simplifies the configuration. Still, the common reference density reflector 32 is the 20th one). Harakoshi Narration Department 16
Since the reference density reflection plate 32 is located at a location different from the reading scanning position D2 of the document xob, there is no risk that the reference density reflection plate 32 will rub against the moving document
A contact glass 12 is placed at the document reading scanning position D2 of b.
A dedicated guide U is provided.

Furthermore, the reference density reflector plate is 32vll! If you take
By moving the reading scanning position, the amount of shading can be read over a relatively wide range in one line, and the W
By averaging the L sampling results, it is possible to dilute the reading error due to partial dirt on the reference density reflection plate 32, thereby further improving the correction accuracy. In the embodiment shown in FIG. 2(1), the means for moving the reading scanning position is moved together with the mirror 20, 20'Ik light source 18 of the optical system U, but for example, as shown in FIG. As such, the reading optical system U
, the light source 18 and the photographer 26 may be incorporated into one camera unit, and this unit 36 may be moved for 5K.

As described above, in the image reading apparatus according to the present invention, in the image reading apparatus having two g originals Ill' for reading the fixed original and the Snx original so that they can be read separately, the reference density reflection for performing shading correction tEV is used. Only one plate is required, and the shape correction circuit based on the placement from the reference density reflector plate can also be shared, which greatly simplifies the configuration and allows two In the original lff four face order parts, it is possible to perform accurate shading under the same conditions,
Moreover, the reference density reflector is for two originals flLkIIL.
Since it is located away from any of the reading scanning positions of the parts, there is no risk of it being contaminated, and therefore the noise correction accuracy can be maintained for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an example of a conventional image reading device, FIG. Fig. 3 is a schematic cross-sectional view showing another embodiment of the present invention.
・1st degree 2nd original W4g removal section 8...Reading optical system...
...Field element J...Correction circuit V-・-g (!!
No. 32...Common reference density reflector Y...Scanning direction k...Movement direction DI-...Fixed original seed removal scanning position @
D2...Moving original scanning position 1tDo...Reference density reading position Representative Kiyoshi Torii Figure 1 Figure 2 (O)

Claims (1)

[Claims] A first original reading unit performs a first reading by fixing the original and moving the scanning position, and a first reading part performs one reading by fixing the reading scanning position and moving the original. An image processing device having a second original W4 reading unit (with a shading amount applied to a position that does not belong to any of the scanning positions of each original in the first and second two original IE failure parts) A common reference density reflection plate is provided to detect the first and second documents WR based on the amount of shading detected by this common reference density reflection plate.
, jIt part.