JPS58134572A - Picture reader - Google Patents

Abstract

PURPOSE:To reproduce a picture with good quality, by rotating a stripe sensor comprising a plurality of picture elements and a projected picture relatively, outputting reproduced picture information, and increasing the sensitivity of the device. CONSTITUTION:An original 10 on an original tray 6 is illuminated with an illumination system 5, and a projection image 2 of the original 10 is projected on the stripe sensor 14 via a lens system 9 and an image roller prism 8. This prism 8 is rotated with a motor 7 to relatively rotate the projected image 2 on the sensor 14. An input value from each picture element is processed at an operation processor 15 to output a reproduced picture. The sensor 14 and the image 2 are relatively rotated, thus the picture with good quality is reproduced and the sensitivity of the device is increased with a simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for converting images into electrical signals.

Conventionally, electromagnetic waves, sound waves, etc. are projected in two dimensions.

Various types of sensors have been used as a device (hereinafter referred to as an image sensor) for inputting an image consisting of an intensity distribution and converting it into a time-series electrical signal. As shown in Figure 1, one of these devices detects energy from the same terminal depending on the intensity of the input, no matter which part of the area it occupies receives energy such as electromagnetic waves or sound waves. A single element (hereinafter referred to as a pixel) that outputs a good electrical signal and cannot distinguish which part of the area that signal corresponds to the input signal is arranged in a straight line. 0(
Hereinafter, such an image sensor will be referred to as line sensor 3)
0 However, in the 2-in sensor 3 shown in FIG. 1, while converting the entire image into an electrical signal, only # of the total input energy constituting the two-dimensional image is effectively utilized. It is only the part that is input to the ii prime group,
In this respect, image sensors that always input the entire image (hereinafter such image sensors are referred to as area sensors) are very disadvantageous in improving the sensitivity of image sensors. However, in a normal area sensor 4 as shown in the 1m2 diagram, the pixels are arranged in a grid pattern and the structure is complicated, making it not only difficult to manufacture, but also difficult to manufacture from each element. The present invention eliminates the above-mentioned drawbacks and provides an image reading device with a simple structure and high sensitivity.

Hereinafter, embodiments of the present invention will be explained using the drawings.0 Figure 3 shows the basic concept of the present invention.The image sensor 14 in Figure 3 has a shape of an image 13 that is longer than its width. The pixel 13 has a much longer strip shape, and a large number of pixels 13 having such a shape are arranged in the width direction to form a stripe shape. Father, on these pixels 13 are projected electromagnetic waves to be detected, two-dimensional iii*2 consisting of them,
The two-dimensional 1ii 82 and the image sensor 14 are rotated relative to each other, and the single force signal obtained from the pixel 13 due to this rotation is processed by the arithmetic processing unit 15 to generate a time-series electrical signal. 81, which can reproduce the image, 16 is a rotation detection device, and the image sensor? 14 has made one rotation and sends a signal to the arithmetic processing unit f15. Therefore, such an image sensor (hereinafter referred to as a stripe sensor) 14d is essentially considered to be an area sensor. , the calculation processing for reproducing the two-dimensional 1Iiii4a will be explained. The fact that such a method is possible in principle is based on the idea that the width of a rounded pixel is infinitesimal and the length of a pixel is infinitesimal, to simplify the explanation, as shown by the Austrian mathematician J. Radon in 1917. The coordinate system fixed to the stripe sensor is the x-y system, and the coordinate system fixed to the stripe sensor is the Suppose that an electrical signal 1 of ゛(x, y) is output. At this time, if pixel X of the stripe sensor extends to Y length, the output of pixel X & (X
) is the output &(X)&(X
, θ)=L7(−θ−Y噸0.toσ+Y−)dY...
. . . g(X) in the image 20 represented by (2).

The output state of g(X, θ) is shown in red in FIGS. 4 and 5. ej-t', V (X, e'). The inverse Fourier transform G(r, σ) regarding intersection and C is G(r, #) = JICX, θ) e'xp(-i rx)
tX=5ktO-θ-Y, tJ, Xmθ+Yc, osθ
)aYexp(-i rx')dX=month'f (x,
y )exp (-ir (xgo+y-))dxd
yHere, if we set rcoaθ=ξ, r-θ=ma, then =jXf
(x,y)expC-1(xξ+”7))dxay2F
−(ξ, Ma) F(ξ, 1゛) is the inverse Fourier transform of /(x, y) with respect to X and y, so 7(X, y) is F(ξ,
In the sixth section, we explain an example of actually reproducing an image using the 0-9 operation method obtained by Fourier transform of v).
As shown in the figure, an ITO film was deposited on a glass substrate 10 to form a transparent electrode 11. On top of this, monosilane gas (8iHa
l) An amorphous silicon film was deposited to form the photoconductive layer 12 by a glow discharge decomposition method. Furthermore, an aluminum layer was vapor-deposited on top of that, and this aluminum layer was patterned into 2J+1 stripes using a method similar to that used in normal semiconductor device fabrication technology to form a counter electrode (aluminum electrode 1i) 13. One end of each aluminum electrode 13 is electrically connected to the processing unit Km.
Subsequently, a stripe sensor 14 was prepared. Next, transparent electrode 1
Apply DC voltage) () to 1, and then connect the aluminum electrode (
Pixel x! -) Make a circle so that the current flowing into 1aKfi can be measured.

Now, as shown in No. 7-, by irradiating the original 10 on the original platen 6 with the illumination system 5, the image 2 of the original 10 is created by the V lens system 9. The image is projected onto the stripe sensor 14 via the image rotor cheetah rhythm 8. In addition, use motor 7 to rotate Image Lochta Rhythm)
% The projection screen 2 on the stripe sensor 14 is rotated. Next, the input (current value) from each pixel (X, ~Xy) is processed by the processing unit 15 according to the method shown below to reproduce the image .

The method shown here is shown in Figure 4 above.

Although this method is based on the method explained using gsg, in an actual stripe sensor, the pixel width is finite, and an approximation method must be used for rounding, which is limited by the ability of the arithmetic processing unit 15◇ Maku, Stripesen WFiX direction,
Since the Y direction is also limited, the projected image of the document must always be completely included in the stripe sensor.

The center of each pixel (X4 to X5J) shown in Figure 6 and
Coordinates X Bano = 0.1, 2. ... song, 2J-1°2J) and is named pixel XJ. In FIG. 7, the projection image 2 of the original 15 is rotated at a rotation angle #k (#: 2π/), and the rotation range 2K of the coordinate system X, Y is equally divided into kli-th angles σk. The integrated value (input signal) of the current flowing into the pixel X7° while rotating from 0) to '++ is ficXj.

Jk) & (Xj, Jk) (7=0, 1
,the law of nature·····.

2J-1,2J') is obtained, and immediately the following inverse 7 is obtained.
- Perform approximate calculation of Rie transform.

Note that R is an arbitrary constant, ``/(Xu-XJ) e
) It is best to choose several times as many.

Next, after the original 15 has completed one rotation, as described above,
Set s0=ξ, ywxll=1, polar coordinate system (r@t
19h) to the orthogonal system (ξmtvtx),
n=0,1,2°・-, zJ i9ξ. ,Ma. =-R1
ξ Town axis = R) Convert Km. But with this conversion %
Since rl'Ptξ and ma are not 4 continuous quantities, complete conversion cannot be performed. There are (2J+1) combinations of (#llmaa)0 to be found, ], so as shown in the sg, (ra,ma,)KJI is also broken and (r*t1k) is used to find F(ξtown The arithmetic processing unit tstc may be selected. Therefore, the more combinations of (r!, θk) there are, the more likely it is.

The closest (r!, θk) to (#,,ma,) can be selected.

Thus F(ra, y,)(m t n = O9L
2. . -, 2J) can be obtained, so it is possible to perform an approximate calculation of the first-order square Fourier transform.

2'J KokoteAX=”/(X/++ XjX friend L Pt q
=0+L 2. "-"';'-Also X・='jm=X
・, 5ji = y proof = Xu) In this way, the picture book + y)
Since the output of is obtained approximately, this can be converted into a time-series electric signal SIK to reproduce an image. The above calculation process will be explained according to the 9th m-7a-chart. Note that the arithmetic processing shown here is performed in RAM.

Stored in ROM K. Furthermore, memory I, I, IKtJ
If you use RAM, it will be better.

In '8tePIK, set -=θ. Next K 5
Input 1/(Xj*θk) from each pixel between 1=#k and 1=-11B41 is stored in the memory I as shown in FIG.

At 5top@, input j' (Xjt Jk) is inversely Fourier transformed as described above, and after rounding, the base value is lK at 8tap4.
The memory IK@ is stored as shown in Figure 11.

In 5toPSK, the projected image 2 is 1 from the rotation detection device 1-
Determine whether it has rotated or not, and if 1g1 rotation has not been completed, obtain input # (XJ, ^) that moves to the next angle of K11. After the projected image 2 completes one quadruple rotation, the contents G(!t Jk) of the memory I are stored in the memory 2 at a rate of 5 sbps. 8teP
By performing the 7-Rier transform on F(ra, 1n) in step 7, the output of the abstracted image f(x, y) is obtained as a time-series signal.

In this embodiment, it is possible to rotate the projection II2 of the original 1110 using the image roller tab rhythm 6, but it is possible to rotate the document 1o using the lens system without using the image roller tab rhythm 8. The projection image 2 and the Stokwibsen + 14 may be mutually rotated.

Alternatively, the original may be kept stationary and the stripe sensor 4 may be rotated. In addition, in this embodiment, the original 15 is rotated only once, but the original 15 is rotated by multiple mb.
It is also possible to memorize the output monk name for each li turn by printing or the like, and output the average of the hiro at the time of output.

As explained above, it is easy to improve the sensitivity of the stripe sensor and the document reading device, and at the same time, it is possible to create an image reading device that is simple in structure and easy to manufacture. I can provide.

t m1iio brief explanation〉 jllll is a diagram showing the licensor, Figure 2 is a diagram showing the area sensor, Figure 3 is a diagram showing the stripe sensor in the present invention, Figure 4 is the image 20C) Output l ), FIG. 1 is a diagram showing the output g<x*e) of the angle 1IIa1 rotation nine and turtle picture snow O, FIG. 6 is a diagram showing the stripe senna in this embodiment, 71st! ! 1 shows the image reproduction method in this embodiment. Figure 8 shows the polar coordinate system and the orthogonal coordinate system. The 9th wJ is the flowchart in this example) s lidlOwJ/lil
9 It shows [, 111I It shows the picture showing the picture 1, Figure 13 shows the story 1 and the picture 191.

Here, 2 is the projection screen, 6 is the HirojI @ system, and 6 is the manuscript table.

7 #i motor, 8 is an image roller taprise, 11 is a transparent electrode, 13 is an electrode, 14 is a stripe sensor, and 15 is a calculation unit layer device.

Patent applicant: Canon Co., Ltd.

Claims (1)

[Claims] It has a stripe sensor consisting of a plurality of pixels on which the image to be reproduced is projected, and by relatively rotating the 9 images projected and the stripe sensor, the image information to be reproduced is Image reading device for output.