JPS58195870A - Scanning method - Google Patents

Abstract

PURPOSE:To read out electrostatic latent image in a short time with a reduced number of picture element and to deal with moving picture as well by scanning said image by changing the speed of main and auxiliary scanning and the diameter of a beam in a prescribed relation and changing a sampling time as well. CONSTITUTION:The electrostatic latent image of an object 1101, etc. are formed on a matrix-like image detector 1105. The latent image is scanning with the laser light flux from a laser 1107 through an optical system 1110 including a shutter 1115 and a zoom, a mirror 1111 for auxiliary scanning and a mirror 1113 for main scanning and is read out as picture image signal. The galvanometers 1114, 1112 of the mirrors 1113, 1111 through control parts 1160, 1161 for main and auxiliary scanning are controlled together with said shutter 1115 and the system 1110 by a CPU 1154, and if the main scanning speed is made K times, the auxiliary scanning speed is made square times the K and the diameter of the scanning beam is made K times; at the same time, the sampling time is also controlled with the shutter 1115, whereby the number of picture element is reduced for moving picture and the scanning for reading out is accomplished quickly with high time resolution. As a result, the moving picture is also dealt with satisfactorily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scanning method, and more particularly, to a scanning method in which the total scanning time is made variable by changing the number of pixels in a device that reads out time-series electrical signals using a photoconductor, for example.

Nowadays, medical xI! During imaging, in order to reduce the amount of radiation exposure to horizontal writing and to improve diagnostic ability by performing various trench treatments, electrostatic charge a formed on the photoconductor by X-ray irradiation is used.
A device is being considered that performs optical scanning and reads out time-series electrical signals.

Here it is static! The @ line that forms fi& is
In principle, any wavelength is possible, such as OT radiation, infrared rays, ultraviolet rays, and electron beams, and even if the electrostatic latent image is irradiated by transmission through the object, it can be irradiated by reflection. It may be.

The basic process of reading out this electrostatic latent image is described in Japanese Patent Application Laid-Open No. 4-3
1219. It is known as No. 56-92549, and it is also known that it was applied to X-Sakue Souichi.

However, 1. Conventional equipment using the F period process,
Although high image quality could be obtained, it took a long time to read out 1, and it was not suitable for observing moving images of moving subjects, that is, images that were not static and autonomous.

The present invention overcomes the drawbacks listed above! #The purpose is to provide a new method for sequentially reading out still images in a shortened time by reducing the number of pixels for moving images while reading out self-portraits in the conventional manner. .

According to the present invention, 1. Even if the quality is degraded to some extent, it is possible to increase the time resolution mB, and it is also possible to obtain a still image with good image quality at the moment when the movement of the target image is considered to be optimal.

In the case of moving images, 1. Compared to Seigataku, it is somewhat 1i1
11 Even if the quality is degraded, it will have little effect on human vision when observed with the naked eye, and the effects of the present invention will be useful.

Before explaining the present invention in detail below, a conventional electrostatic latent image reading process will be explained first.

Diagram M1 is a block diagram of the electrostatic #image readout process, 101
102 is a transparent electrode, 102 is a photoconductor layer, 103 is an insulator layer,
104 is the boundary direction between 102 and 103, 105 is an electrode, 10
6 and 107 are switches, 108 is a DC power supply, 109 is an output terminal, 110 is an output resistor, 111 is an itchy light, 112°, 113, 114 is a charge, 115 is an object to be examined such as a film, 115 is a transparent part, 115b is a An opaque part, 116 is transmitted light, 117 is a light beam such as a laser, 118 is a rotating or vibrating mirror, and 417 m.

117b is the reflected light from 117 by 118, I's is the output 11L flow, and vs is the output electric ratio. In Figure 1 (2), the switch 106 is turned on, the switch 107 is turned off, and the DC power supply 108 is applied between the transparent electrode 101 and the electrode 105 as shown, and the photoconductor 11102 and the insulator are layer 1
Photoelectric 03. In this state, when the entire surface is irradiated with lightless light 111, the resistance of the photoconductor layer 102 decreases and charges are injected, and the charges in the transparent portion 41101 reach the boundary [m104 as shown in the figure, and the charges are 112, It is accumulated like 113. This is called primary charging.

Next, when the exposure light 111 is removed, that is, the state is darkened, and the switch 106 is turned off and the switch 107 is turned on, the transparent charge 101 has a charge of 1, as shown in FIG.
14 appears.

In this state, as shown in l/A1 diagram (1), the subject 115
When the entire surface is irradiated with Kikoko 1.11, the transmission % 116 reaches a transparent charge value of 101 in the most part of 115 m, the resistance of the photoconductor layer 102 decreases, and the charge becomes 112°, 113.114
disappears. Therefore, only the portion corresponding to the portion 115 remains. I use this as my light, and capture the remaining charge pattern as an electrostatic latent image.

After scanning, as shown in FIG. 1(d), the scanning mirror 11 is turned off with the switch 106 turned off and the switch 107 turned on.
A light beam 117 is applied to 8, and the reflected light 117 m,
When the transparent electrode 101 is irradiated with l 17 b, the resistance of the irradiated portion of the photoconductor layer 102 decreases, and the insulator layer 1
The charge 112 of 03 is released through the output resistor 110, and an output current 7711m flows, producing an output voltage Vs at the output terminal 109. FIG. 1(d) shows a state in which the reflected light of the light beam 117 by the scanning mirror 1'48 scans from 117a to 11b. In this way, the electrostatic latent image can be read out by applying a current Is or a voltage V.

As is clear from the figure, the output current Is is the transmitted light 116
does not flow in the irradiated portion, and flows only in the tip portion where the transmitted light 116 is not irradiated. In other words, the current flows in the light part of the trench, and the current flows in the dark part of the trench.

In the above explanation, it is assumed that the charge completely disappears in bright areas and is completely retained in dark areas, but in this method, if there are intermediate tones between bright and dark areas, the electrostatic latent image is created accordingly. A current or voltage corresponding to the electrostatic latent image can be obtained.

FIG. 2 shows an example of the output according to the method shown in FIG. 1, where the horizontal axis is time, or basically the scanning distance of the light beam 117, and the vertical axis is the current l- or electric ratio v1. 201 is a waveform of a bright area, 202 is a waveform of a dark area, and 203 is a waveform of an intermediate tone.

Although the above description has been made only when optical scanning is performed in one dimension, if optical scanning is performed in two dimensions, time-series electrical signals of a two-dimensional image can be obtained, as in Bidet No. 15.

FIG. 3 shows another conventional example, in which 301 to 318 correspond to 101 to 118 in FIG. 1, respectively.

In FIG. 3(,), when the switch 307 is turned off and the switch 306 is turned on, charges 312 and 313 are charged to the transparent electrode 301 and the electrode 305, respectively.

The difference between FIG. 1 (,) and hawk is that in FIG. 3 (Hata), exposure light is not irradiated, so the charge 312 is transferred to the photoconductor layer 30.
It remains at the transparent electrode 301 without being injected into the transparent electrode 301.

In this state, when light is applied as shown in FIG. 3(b) in the same manner as in the case of FIG. mA injection, the charge 312 moves to the interface 304 and becomes 312-.The part that is not irradiated with the transmitted light 316 has a charge 312
a It stays on the transparent electrode 301 as it is.

Next, as shown in FIG. 3(c), the switch 306 is
When the switch 30 is turned off and the switch 30 is turned on, the transparent conductor @A3
Since the electrode 305 and the electrode 305 are short-circuited, the charge 312 is released through the output resistor 310, and the charge in the portion not irradiated with the transmitted light 116 disappears. Also, transmitted light 116
Electrostriction RA 14 appears in the irradiated area.

Thereafter, as shown in FIG. 3 (d+), if the latent image is read out in the same manner as in FIG. 1 (d), a current or voltage corresponding to the still image can be obtained.

In the conventional example shown in Fig. 3, charges remain only in the bright areas of image exposure.
It can be seen that the electrostatic solution 111 in the bright and dark areas is opposite to that of the conventional example shown in FIG.

This also applies to cases where there are intermediate tones between brightness and darkness.

The ag4 diagram is an example of the output by the method of the 紽3 diagram, each with 401
is the bright part □, 402 is the dark part, 403 halftone waveforms, 6
The brightness and darkness are reversed from Figure 142.

As shown in Fig. 5r, when the conventional example described above is scanned with two-dimensional light, the electrostatic m
This shows how 1ll is read. 1# detector 501 corresponds to what is seen from the transparent electrode 101 in FIG. 1 and the transparent electrode 3011kF in FIG. 3. 502 to 506 are trajectories of optical scanning. The main scanning of the optical scanning is performed in the direction of the arrow, that is, from the left to the right in the figure.

Ith11 scan is shown above in the figure, 502, 503,
It scans in the order of 504° and 505, scans many lines (not shown), and finishes by scanning 506. Following this time lapse, we get 507,508,509,510゜51
1.512,513,514. The last 515°51
It is clear that it ends with 6. At this time, as an example, the size of the detector is 400 x 400 m, and the optical scanning is (1
If it is performed at an interval of 1i+a, and in each main scan, the 0.1 interval is one pixel, and each pixel requires a sampling time of 0.5μ, the total scanning time from 507 to 516 is T, is = 8 formula, i.e. static m/! 1. It took me a very long time to put together a plan. The repetition cycle to obtain the reconstructed image was very fast, and 1 ml was lost every 8 days. Therefore, there is movement in the target image.

#i Conventional method cannot cope with certain cases.

The present invention, which is adapted to generate images of such moving objects, will be described in detail below.

FIG. 6 relates to a first embodiment of the invention which increases the scanning speed and reduces the total scanning time.

Here, the relationship between the total scanning time, the number of pixels, the scanning speed, etc. is as shown in the following equation.

'[' = t@x14 = l@X) JIN
2 Here, '1' is the total scanning time, t is the sampling time required to read from one to the next, N is the total number of pixels, NI is the 1IiII cumulative number in the main scanning direction, and N is the sub-scanning The number of lines in the direction, vl is the main scanning speed, town is the sub-scanning speed IJL,
a is main scanning kt! Can, b is the sub-scanning distance.

Now, if we reduce the number of pixels in one scan* direction Nit for a moving image without losing the film properties (in addition, one prime number N in the main scanning direction is reduced by ItCs sub-scanning b' the same number of pixels) N
, it is a special aspect that the aspect ratio is not l), N1oc wl t@ If the sampling time te is the same as in the case of one still image, the main scanning speed ν
If 1 is made larger in the case of moving lI&Ii images, the total scanning time T can be shortened. That is, by increasing the main scanning area, the total number of pixels N is reduced and the total scanning time T is shortened.

FIG. 6(,) shows normal reading of a still image.

In the figure, 608a is a spot light for optical scanning. Figure 6 (b
) shows a case in which the scanning speed is increased to an extremely large extent when a moving image is scanned. FIG. 6(c) B is a moving image in which the scanning speed is increased and the cross section 1ilit&' of the scanning beam is increased.-C A.

As shown in Fig. 6(b), if the scanning speed is increased dramatically, information from all areas will not be used when the gun is projected.
Information will be detected from random areas, but the 6th
If the cross-sectional area of the scanning beam is increased as shown in Figure (C), information from the entire area will be used. This has the advantage that a large electrical output from the detector can be obtained. By the way, in order to reproduce an image with an aspect ratio of t;l, that is, to rotate the number of vertical and horizontal pixels, the sub-scanning speed should be set to 1 when the main scanning speed v1 is doubled.

This is because by doubling the main scanning speed, the number of pixels N1 in the main scanning direction becomes 1/K, and along with this, the number of pixels N2 in the sub-scanning direction is increased by 14 times. is 1/kf
&, and the sub-scanning speed is tripled due to ν1, ie, VC.

In FIG. 6(C), 6011fi image detectors 602 and 607 represent the trajectory of optical scanning. 608b represents a spot light for optical scanning. Compared to 608ayc7, the 608b Fi diagram shows an example of twice the amount.

Therefore, if the sampling time interval is the same in Figures 6t,) and (C), the interval of each of 608b is deposited twice that of 608 Maro, and the interval of each of 605, 606, 607 is 602, 603. , 604 is twice as large as that of , 604. Therefore, the number of pixels obtained from the entire surface of the detector is IA by comparing FIG. 6(C) with FIG. 6(a). That is, from this fact, if the light spot size for optical scanning is doubled, the total number of pixels will be IAr.

Light spot size r.

It is clear that if the total number of pixels is N, then it becomes N''p.Since the pixel sampling time interval is constant, the total scanning time is as shown in Fig. 6(c).
, ), and it is clear that the total scanning time T is 1''A, which is the same as the total number of pixels.To realize FIG. 6(c), For (c), the light spot size for optical scanning should be doubled, the main scanning speed should be doubled, and the sub-scanning and *degrees should be quadrupled compared to Fig. 6 (Hata). Reducing the spatial resolution of , the total scanning time becomes shorter in inverse proportion to the square of the low F-rate, which is very effective.With the above-mentioned Te paralysis, the main scanning and sub-scanning can be reduced to 0. .5 mm spacing, i.e. 11
1! If the size of the Ii element is 0.5, the total scanning time T
1 is TI= -X -X O,5X 10'0.5
0.5 = 0.32 m, and by setting the vertical and horizontal spatial resolution to IA, the darkness time of one Zentun can be reduced to 1/25.

Now, from the above two equations, it is clear that the total scanning 1Ij
The interval T between f is expressed like a field.

T −t@X Nl? %=' 1 In other words, in order to increase the total scanning time T by 1/1C'', there is a fee to increase the sub-scanning speed wl to 1'*.

However, as long as this condition is satisfied, the main scanning speed ν1 can be changed at the discretion of the company, and it is also possible to change the main scanning speed w1 without changing it. However, in that case, the ratio of the number of pixels in the main scanning direction -' to the number of pixels N in the -1 scanning b' direction is no longer 1, and a vertically long image is reproduced. However, due to some lack of information, it may have been used for shrines, depending on the legend.
Let's be next. Note that just as it is possible to create a vertically long image, it is also possible to generate a horizontally long image.

Next, FIG. 7 shows a second embodiment of the present invention.

This differs from the previous embodiment in that the sampling time t. is changed. In other words, the beam is irradiated intermittently, that is, intermittently, or the irradiation is continuous, the sampling is made coarser, the sampling time t is increased, the number of pixels N1 in the main scanning direction is increased, and along with this, the number of pixels in the sub-scanning direction is increased. This reduces the number of trees per direction N, and as a result shortens the total scanning time. The -q method is possible by turning the optical scanning light source on and off at high speed using a mechanical shutter or the like, and the latter is possible by thinning out the waveform shown in FIG. 12 (a), which will be described later.

Here, the following is clear from the above equation.

N1'' disease 1cc- If Young Ring is performed in skips across the town, for example, every other pixel, the sampling time tI needed to read the next li!ii element from a certain pixel will be doubled.At this time, the main scanning speed υ
凰 is the above-mentioned example! There is no need to change it to 4. By doubling the sampling time t, the number N1 of pixels in the main scanning direction becomes 1/2 times, and the number N1 of pixels in the sub-scanning direction correspondingly increases.

l/21i! If it is I (to create an image with aspect ratio l), the sub-scanning speed *v is 2fL! It should be r.

Nao, is this also the case with the embodiment shown in FIG. 6(b)?
If sampling is performed by shifting the phase by l spots and l scans in the main scanning direction and -scanning direction, respectively, 4:1 interlacing can be easily realized. In this embodiment, the interlacing is 4 to 1, but it goes without saying that the present invention is not limited to the sampling interval.

FIG. llA3 shows a third embodiment of the present invention, which reduces the number of JiIi primes by reducing the scanning range and shortens the total scanning time. That is, the total scanning time is shortened without changing the scanning speed or sampling time.

FIGS. 8(a) and 9(b) show the positions for reading out the still image and dynamic rhythm, respectively. JI81m represents the state of optical two-dimensional scanning of the flaw detector as in the above embodiment, and 801 to son correspond to 601 to 608.

FIG. 8(b) shows that optical scanning is performed with the scanning range set to 1/2 in the vertical and horizontal directions. Therefore, in FIG. 8(b), the total number of 1jli pieces N is 1/4 times that of FIG. 8 (crow). Therefore, if the angle of view for optical scanning is 1×4, then N
7 oc d" as described in FIG. 7. In the calculation of the total scanning time i mentioned above, if the optical scanning range of the detector is 200 x 200 m, then T = 200 x sub-X
0.5X10' 0.1 0.1 = 2 anus, reducing the optical scanning range by 1/! By doing so, the total scanning time can be reduced to 1/4. This method is extremely effective because it is often sufficient to observe a small angle of view when observing a moving image.

FIG. 9(-)(b) is a modification of FIG. 8. 90
2° 903 corresponds to 809, and indicates the deformation of the reduced angle of view in the case of a moving image. As described above, the present invention is not limited to the shape or size of the reduced angle of view. Furthermore, in XM imaging, the example in Figure 9(a) is particularly effective for vertically elongated subjects such as the esophagus, trachea, dorsal vertebrae, and limbs.6The example in Figure 9(b) is also particularly effective. Effective for horizontally long objects.

Note that, as explained in the latter part of the first embodiment described above, there is no information path when the ratio of the number of vertical and horizontal strokes is not 1, whereas in this embodiment there is an information path, but there is no playback. riIA
11J maintains an aspect ratio of 1.

Next, Fig. 1θ shows the fourth embodiment of the present invention, in which the first and third
This is a combination of the above embodiments.

Figure 1.theta.(,)tb> is for a still image and a moving image, respectively. In the figure, 1001 to 1007 are 601 to 607°8
01 to 807, 1008a and 1008b correspond to 608 Hatake and 608b, and 1009 corresponds to 809, respectively. In this case, since there are 8 N'''' doors and T''' doors, the total Both the number of pixels and the total scanning time are reduced to 1/16.

Similarly to the calculation described in i11, if a 400' x 400 square image detector is sampled in a 200 x 200 square range at 0.5 square intervals, the formula -0.08 is obtained, which is the repetition frequency at which images can be obtained? , is = 12
．． 5 fb. This is fast enough to observe normal movement. Therefore, in this calculation example, the spatial resolution is 2 pe/,
An image with a viewing angle of 200 x 200 tll at 4 m can be obtained with a temporal resolution of 12.5 frames per second. If the sub-scanning speed is further increased and an interlaced system is used, as in Television VII, the temporal resolution of observation will be further improved. For example, if 2:1 interlacing is used, a moving image of 25 frames per second can be obtained in a pseudo manner.

The present invention is not limited to interlacing ratios.

Further, although the optical spot for optical scanning is shown as a circle in this embodiment, the optical spot for optical scanning is not O-shaped in the present invention.

In this embodiment, the optical scanning range is illustrated as a square, but the present invention is not limited to the shape of the optical scanning range.

In addition, if the light spot size for optical scanning is increased and the light intensity per unit area of the light spot is the same, the magnitude of the electrical signal read by optical scanning will increase, so if the optical spot size is increased, Even if the light intensity per unit area of the light spot is reduced, the same s, hz ratio can be obtained.

By the way, when a subject is irradiated with xm to form an electrostatic latent image, the present invention is used to obtain a ratio of Xl! !
In the case of fluoroscopic observation, the total scanning time can be shortened, but if the diameter of the scanning beam is increased during fluoroscopic observation, a large electrical output can be obtained as long as the X-ray exposure is constant. By suppressing the electrical output to the same level as in x and d imaging, it is possible to suppress the x-fuse exposure sensitivity during X11M fluoroscopic observation.

Conversely, if the X-ray exposure wrinkles are constant, the light intensity of the scanning beam can be kept low during X-ray fluoroscopic observation, as described above.

FIG. 11 is a block diagram of one embodiment of an apparatus for realizing the present invention, and FIG. 12 is a timing chart of each signal when the apparatus of FIG. 11 is operated. 1101Fi object, 1102 object illumination light source, 1103 condensation lens, 1104 shutter, 1105 image detector shown in Figure 1.3, 11o6Fi housing, power supply explained in Figures 1 and 3. , switches, etc. are omitted. 110
7 is a light source for optical scanning such as a laser, 1108 is a mirror,
1109 is a light beam spreader with a zoom mechanism that expands a parallel light beam and changes it into a parallel light beam with a diameter of 1.1
109 is a motor or solenoid drive F@III, 1111 is a mirror for party law scanning, 1
Galvanometer, 111 driving 112 digits 1111
3 is a mirror for the main scanning, 1114 is a galvanometer that drives Fill 13, 1115 is a shutter, 1151
is an amplifier, 1152 is an analog-to-digital converter, 11
53 is a memory for storing moving images; 1154 is a central control unit for controlling the timing of FI price and performing one-time processing; 115;
5 is the same memory as 1153. 1156 is 1 digital to analog converter, 1157 is 7 monitors for observation, 1158
1153.1155 is a large static image memory memo lJ3.1159 is a printer that outputs static images, 1160 is a printer that outputs static images, and 1160 is a printer that outputs the first main scanning eclipse #@4mM. for 414 v%%k, 1162
These are dynamic-imagery brassware such as uVTR and Hyteotisque.

Also, the stripe 12 (maro) is an analog-to-digital converter 1152.
12(b) is the pixel sample control number d that controls the light scanning side, and 12(c) is the pixel 12(b).
12(d) is the light-scanning control ID number, FIG. 12(e) is the dynamic II & Ii stationary automatic switching signal, and FIG. 12(f) is the light-scanning control signal. Timing No. 15, 1' in the figure is the image happy time, Ts is the total scanning time for moving images, T' is the video 1 umbrella observation repetition period which is the sum of t' and Ts, and T is the total scanning time for still images. Scanning time, (η indicates the moving-observation state, (Y) indicates the case of stationary 1 & ii observation,
In the 1I412 diagram, (,) to <1> are on the same time axis, and (-
)Cb> is shown enlarged. In the case of video observation, the shutter 1104 controlled by 1154 is opened [1, and the light source 1102 is The light is turned on to illuminate the subject 1101, and the reflected light is reflected on the image detector 1105.
A latent image is formed. At this time, a shutter 1115 controlled by the central controller 1154 blocks light from the scanning light source 1107. When image dimming is performed in this manner, the light source 1102 is turned off and the shutter 1104 is closed. Next, in FIG. 1(d), the process moves to the phototactic reading process of the third factor (CHd), and the shutter 1115 is opened.
The light beam output from the scanning light source 1107 passes through the mirror 11
08, the beam is made into a desired beam diameter by a light beam spreader 1109, and is reflected by mirrors 1111 and 1113 to optically scan an image detector 1105. In the case of observing a moving image, the light beam spreader 1109 uses a drive mechanism 1110 controlled by 1154 to make the diameter of the light beam larger than that in the case of a still image. Signal generated! 1160.116
1 outputs the synchronization signal of 1154 and the signal of the state of video observation state (excerpt from No. 4 (,), (d) IX),
1114 and 1112 are driven to optically scan the image detector.

When optically scanned, the one-zoom transverse detector converts the electrostatic a-image into a time-series electric signal as explained in FIGS. 1 to 4. This time-series electric signal is amplified by an amplifier 1151, and the central controller 1
154, the signal is converted into a digital signal by an analog-to-digital conversion@1152 controlled at the timing shown in FIG. 12 (Hata), and is written into the memory 1153. T,
When the full optical scanning is completed in time, the nine steps described above are repeated in a period of f-2. Also, during the t-2 section, the moving 1Ikl image data is stored from the memory 1153 from the memo 1J1153.
Transferred to 5. The data in the memory 1155 is continuously outputted in synchronization with the television by the central controller 1154, converted into an analog television signal by the digital-to-analog converter 1156, and observed on the monitor 1157. Even while the moving image data is being written in the memory 1153 for the period Ts, the moving image with one cut is displayed without any problem on the monitor 1157.

In this way, in the moving image observation state (3), the central controller 11
54, the re to the detector is sent to the detector at a constant period.
M-light, electrostatic image formation, and optical scanning reading are performed, and the memories 1153 and 1155 allow moving images to be observed on the monitor 1157 without any trouble. Additionally, this moving image can also be recorded by a moving image recorder 1162.

If the operator wants to obtain a still image at the next timing, the operator issues the signal shown in Figure M12 (C) by means not shown, and the central control unit 1154 detects this and switches the control from the video control. Switch to still image control. In this case as well, the same process is carried out in r-10 as in the case of moving images, but the central controller 1154 controls the main body 1110 to drive the light beam spreader 1109 and adjust the beam diameter for light scanning. Make it smaller than for videos. In addition, the optical scanning control signal Fi (Yl becomes a still image state, (compared to the case of force, m112 figure tC) has a slope of 1/2, an amplitude of 2 times, and a period of 4 times. ing.

Also, %12 (d) rim O change in one period of Figure 12 (c) is 1/! The pregnancy width will be 2 edges. Therefore, in the example shown in Figure #112, the total scanning time is as explained in Figure #M8.
Ha-no 168! become.

19. - The sampling interval of Kiyomi Ori is shown in Figure 12 (Hata)
In the case of ('Y), the total number of tables d is smaller than in the case of (3).
It becomes 16 times. When obtaining a still Idii image, image data is stored in a large capacity memory 958.

After T time, the entire scan is finished and the central controller 1154
switches the control from still images to moving images and repeats the same action as explained to Moe. In addition, the nine still image data stored in the memory 1158 are controlled by the central controller 1111154.
Printer 1159f is published as a hard copy.

In this example, 1114 is used as a galvanometer to show a precedent, but 1114 can also be used as a borigo to change the rotation speed with a still moving image, and also change the scanning angle of view by performing an appropriate delay and gate. It is V.

Previously, in this embodiment, an example was shown in which galvanometer 11:★ was set to 1112 galvanometers;
It is also possible to perform this by moving 05 perpendicularly to the main scanning direction, and the present invention is not limited to optical scanning.

In addition, in this embodiment, the optical scanning speed and the optical scanning angle are set in two stages t.
Although an example of changing ic bJ has been shown, it is also possible to change this in many steps or continuously.

Here, the stripe diagram 13 (tortoise) is the Mitsutsugu scanning control axis No. 4m corresponding to Figure 12 (d), and is 1 in the amplitude direction in the first and second cycles.
/2 phase shifted signal. In this way, a 2:1 interlace similar to the pre-vision described above can be achieved. Furthermore, although the optical scanning control signal in FIGS. 12(d) and 13(,) has a stepped waveform, it may also have a sawtooth waveform as shown in FIG. 13(b).

FIG. 14 shows an example in which the present invention is applied to X-ray photography. 14
01 is the object to be examined, 1402t'iX green tube 1403 I/'i 1405 to 1415
correspond to 1105 to 1115 in FIG. 11, respectively, and the first
1151 to 1162 in FIG. 1 are omitted in FIG. In this embodiment, 1101 in FIG.
The high exposure made by 102 to 14
X made by 04, Nil! 1lIIi1
1! In this case, the present invention can be realized in exactly the same manner as explained in FIGS. 11 and 12.

As explained above, according to the present invention, it is possible to solve the problem of moving image detection due to the repetition period of phototactic scanning type electrophotography, and to make it possible to observe moving images.
This makes it possible to obtain a true still image at a desired moment.

Furthermore, if the present invention is applied to X-ray imaging, all you need to do is perform X-ray fluoroscopic observation except when imaging an X-ray bottle, and switch to the X* irregular shadow state when you want to take an image. It can also suppress radiation exposure sensitivity and is useful in non-4 cases.

In the above explanation, we talked about shortening the scanning time by decreasing the number of pixels, but it is clearly stated that it is also possible to extend the total scanning time by increasing the number of Ic-trees. I'll keep it.

Also, in the above explanation, i! It is assumed that the total scanning time is shortened by reducing the number of Ii searches, but this reduces the sampling time to 1.
This is based on the assumption that there is a minimum value for . In the practical example of @2 of the present invention, if the sampling time t can be made small, the total scanning time T can be reduced without changing the total number of pixels N. It is also possible to shorten it.

That is, for example, if the sampling time t can be increased by 1/2, the main scanning speed can be increased to 11. - By doubling the scanning speed ν1, it is possible to reduce the total scanning time by 'Ei' without changing the number of pixels.

However, in general, the sampling time -0 has a minimum limit value in terms of the power circuit in the highest density detection, and it is difficult to shorten the entire scanning time by shortening only the sampling time.

In addition, as described above, the present invention is formed into an image detector,
Although it has been described that this is optically scanned to obtain an electrical output, the present invention is not limited to this, but includes an image detector in which an optical bright V&I is formed. It still includes those based on radiation scanning such as X-ray scanning, and also includes those in which an image detector is moved and scanned with respect to a fixed beam.

[Brief explanation of the drawing]

IF diagram is a block diagram of a conventional example of the electrostatic a-width extraction method, Figure 2 is an example of extraction using the method in Figure 1, Figure 3 is a block diagram of another conventional example as in Figure 1, and Figure 4 is a block diagram of another conventional example. An example of the output according to the method shown in Fig. 3, Fig. f85 is an example of the trajectory of two-dimensional light scanning by the process shown in Figs.
Regarding the actual example of m, Fig. 6 (1) shows that for a still image,
Figure 6 (b) shows the case of a moving image when the scanning speed is increased, Figure 6 (,) shows the case where the scanning speed is increased and the scanning beam is slightly enlarged, and Figure 7 shows the case of the present invention. Embodiment 2 of the present invention has a longer sampling time, FIG. 8 shows a third embodiment of the present invention with a reduced scanning range, and FIG.
FIG. 8 shows a modification of the embodiment shown in FIG.
12 is a timing chart of each signal by the device shown in FIG. 11, FIG. 13 is a diagram of sub-scanning control signals in the case of interlaced scanning, and FIG. Figure 14 is a diagram of an embodiment using an xm photographing device, in the figure 101, 301 are 14'' JL and others 102, 302 is optical, 1eat body layer 103,
303 is the repair body layer 105, 305 is the layer 1 111, 311 is, Jtyt, light 117, 3
17 is the scanned light beam 501 is the image lateral projection 4 605 to 607 is the locus of light scanning when the scanning speed is increased 608a is the scanning beam 608b for the static self-image
The values 705 and 707 of the running beam for the 4"i video trench are the trajectory of the leading t when the sampling time is increased, 805 and 807 are the !!ilL trace of the leading sac when the running range is reduced, 1105 to 1107 are the trajectories of optical scanning when the scanning range is reduced, the scanning speed is increased, and the beam diameter is increased. Presented by Canon Co., Ltd. Page 1 continued 0 Inventor Sannuclear Power Co., Ltd. Nakahara Ward, Kawasaki City Canon Co., Ltd. Kosugi Office, 53 Imai-Kami-cho 0 Inventor Kawasaki Number - Canon Co., Ltd. Kosugi Office, 53 Imai-Kami-cho, Nakahara-ku, Kawasaki City

Claims (1)

[Claims] (1) In a method of scanning an image detector, +II! A scanning method characterized in that the total scanning time is made variable by changing l prime numbers. (2) A scanning method according to claim 1, in which an electrostatic latent image is formed on a gI detector and electricity (No. 8) is output by optical scanning; and (3) a patent claim characterized by a scanning speed. The scanning method according to claim 1. (4) The scanning method according to claim 3, in which the sub-scanning speed is multiplied by H1 when the main scanning speed is doubled. (5) The scanning beam diameter is characterized by (6) The scanning method according to claim 1, which is characterized by a sampling time. (7) The scanning beam is turned on and off by a shutter, and (8)
The scanning method according to claim 6, characterized in that the sampling time is determined by electrically coarsening the sampling. (9) The scanning method according to claim 6, characterized in that when the sampling time is doubled, the sub-scanning speed is changed. (10) A scanning method according to claim 1, characterized by a scanning area. (11) The scanning method according to claim 1, which performs interlacing. (12) A method for scanning a thief as claimed in claim 2, wherein the static image is formed by X-irradiation. (13) The scanning method of Claim #11211, which changes the total scanning time depending on the case of X*fluoroscopy and the case of X-ray photography. (14) Change the scanning beam diameter between X-11 viewing and X-ray palpitation %ffIII! The scanning method described in item 133. (15) The scanning method according to claim 14, wherein the X-ray exposure violet is changed depending on whether X= is used for fluoroscopy or X-ray photography. (16) The scanning method according to claim 14, wherein the intensity of the scanning beam is changed between the case of X-ray fluoroscopy and the case of X-ray photography.