JPS5860723A - Reproducing device for image encoded by coding plate - Google Patents

Abstract

PURPOSE:To reproduce a real-time image, by extracting optical images having distributions equivalent and complementary to the code hole distribution of a coding plate from the optical image, which is encoded by the coding plate, through a recording plate and a decoding plate and decoding these optical images and subjecting them to the operation processing. CONSTITUTION:X rays emitted from an X-ray generating source 1 are transmitted through a coding plate 2 having a certain code hole distribution to form an encoded X-ray image on a recording plate 10 consisting of a scintillator, and encoded images including wavelengths lambda1 and lambda2 are made incident to a decoding plate 11. In the decoding plate 11, apertures 111-113 are provided in all encoded regions, and monochromatic filters 121-123 through which the light of the wavelength lambda1 is transmitted for apertures corresponding to holes of the coding plate 11 and the light of the wavelength lambda2 is transmitted for apertures complementary to these holes are provided, and output lights pass through a half mirror 12 and filters 17 and 18, and lights of wavelengths lambda1 and lambda2 are inputted devices 13 and 14 respectively, and the subtraction for every picture element is performed by an operator 15, and a real-time image is reproduced by a reproducing device 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for reproducing an image embedded in a coding plate for reproducing an image recorded using a coding plate having a coded aperture, and more specifically, to reproduce an image recorded using a coding plate having a coded aperture. The present invention relates to a reproduction device for an image encoded on a coding board suitable for recording on a board and simultaneously playing back.

Methods have already been proposed for recording and reproducing images using coded plates with coded apertures.

JP-A-55-146411, the title of the invention is ``Image reproduction method using coded aperture''. The difference between This is an image reconstruction method using a coded aperture, which is characterized by taking a correlation with a pinhole code and adjusting and subtracting the correlation result to obtain a reconstructed image.

The inventor of the present invention focused on using a single coded plate having coded apertures for recording images in the above method. It is thought that if recording is performed using a coding plate having a single coding aperture, there will be no need to perform recording multiple times, and simultaneous reproduction and continuous observation will become easier.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for reproducing images encoded with a single encoding plate, which is suitable for simultaneous reproduction and continuous observation.

In order to achieve the above object, the present invention provides a
A device for reproducing an image encoded with a code includes a coding plate having a constant code hole distribution and transmitting light from an image source, and converting or intensifying the image inputted by the coding plate,
A recording plate that generates light outputs including separable first and second wavelengths, and code holes having an equivalent distribution to the coding plate transmit light including the first wavelengths and are complementary distributed. a decoding plate that transmits light containing the second wavelength through a code hole; a light splitter that splits the decoding slope output without deforming the light splitter; A first imaging device that converts a decoded image containing the first wavelength component into an electrical signal; Consisting of a second imaging device that converts into a signal, an arithmetic unit that outputs a difference while maintaining correspondence between output pixels of the first and second imaging devices, and a reproduction device that reproduces the output of the arithmetic unit. has been done.

According to the above configuration, real-time image reproduction is possible by simultaneously encoding and decoding with one encoding board.

The present invention will be explained in more detail below.

First, the recording and reproducing of images using a single coded plate will be briefly described. FIG. 1 is a plan view showing an embodiment of the coding plate.

The coding plate 2 has an area of 11×m, and an arbitrary area is designated as aij. In this example, all is not open, and a
22 is open. The following unopened area is “0#”
The open area is indicated by "1". An arbitrary area a i j u-@0'' or 11'' is defined, and the characteristic of the entire coding plate 2 formed by nXm groups of these aij is referred to as (aij). Using a coded board like this.

A conventional example of recording and reproducing images will be explained with reference to FIG. An image source 1 to be recorded is encoded onto a recording plate 3 by a coding plate 2. Conventionally, a photographic film or the like is used as the recording plate 3.

If the coding plate has X apertures, then X images are formed on the recording plate 3. In the conventional method, the computer 4 performs arithmetic processing on these X recorded images to obtain the reproduced image 5. The arithmetic processing is a calculation to obtain convolution of a digitized recorded image, and if an attempt is made to increase the resolution of the system by increasing the number of apertures, there is a problem that the calculation time for reproduction becomes extremely long. Ta.

The recorded image is used as a secondary image source, and when reproduced using the coding plate 1, X matched reproduced images corresponding to the previous image source are obtained;
! ” −X unnecessary images are reproduced.In reality, there is no negative aperture, so this is impossible to realize, but corresponding to (aij), decoding having the characteristics of (bij) that satisfies the following conditions If the plate can be realized, a unique reproduced image can be obtained from the recorded image 3.Category 17>if 6.(bii)=(2ai
j-1), f if aij=in, then bij=
1, if a ij = 0, then bij = -1, which means that the locations corresponding to the openings in the coding plate 2 become openings, and the locations where there were no openings become negative openings. If such a decoding plate 6 were to exist, a unique reproduced image Ob1 would be transferred from the recording plate 3 onto the reproduction plate 7 as shown in FIG.
is obtained.

The present invention is constructed based on the principle described above.

FIG. 4 shows an embodiment of the device according to the invention.

In the figure, 1 is an image source formed by an X-ray generation source, and 2 is the aforementioned code plate. The image of the image source 1 is encoded onto a recording plate 10 by a coding plate 2 . As described above, if the coding plate 10 has X apertures, then X images are formed on the recording plate 10. The recording plate 10 is a scintillator and corresponds to the encoded X-ray image at least λ1. An encoded image containing a wavelength component of λ2 is output. In this example, λ1 = 450 nm, λ2 =
550 nm. The output image from the recording plate 10 passes through a decoding plate 11 and is split by a half mirror forming a light splitter 12. One image is sent onto the first imaging device 13 via a filter 17, and the other image is sent via a filter 18. 2nd through
is projected onto the imaging device 14 of.

The structure of the decoding board 11 will be explained with reference to FIG. Decoding plate 11 Opening 11 in all areas to be barcoded
1.112.113... are provided. And among these openings, a i j of the coded plate
A monochromatic filter is provided in the aperture at i j corresponding to =l to allow light of wavelength λ1 to pass therethrough. This opening is a'
1j = (λ1]. Also, a'1j = OK. A monochromatic filter that transmits light of wavelength λ2 is provided in the corresponding opening a'ij. This opening is set as a'1j = (λ2).
shall be. In FIG. 5, openings 111 and 113 are a
c corresponding to i j = 1.

Assuming that a'1j=(λ1), the filter 111゜113c is the filter that allows λ1 to pass, and the aperture 112 is ai
This is a filter that passes through the gate f, y, p2z, and λ2, which is the gate a'1j=(λ2) corresponding to j=0.

The filter 17 is a filter that transmits only the light that has passed through a'■=(λ1], and the filter 18 is a filter that allows a'1j==(
λ2] is a filter that transmits only the light that has passed through the filter.

The first and second imaging devices 13 perform an operation of subtracting the output of the second imaging device from the output of the first imaging device 13 for each pixel, and output the result to the playback device 16 .

(aij) i shows the convolution of the image of the recording plate 10 due to the set of apertures passing through λl of the i-decoding plate 11, and (
It is assumed that a ij) represents a convolution caused by a set of apertures through which λ2 of the decoding plate 11 passes. (aij
) y (actj) is an image manually input to the image pickup tubes 13 and 14, so the above calculation is (aij) -
This means that (aCij) has been found. This is what I mentioned earlier (
This means that the result is exactly the same as that obtained by calculating the convolution using
A reconstructed image of b is obtained.

As explained above, the apparatus according to the present invention enables HIJ real-time image reproduction.

Various modifications can be made to the embodiments described in detail above within the scope of the present invention.

For example, when the image source itself includes two separable wavelengths, the recording plate 10 may be a single screen capable of outputting the two wavelength components or an image intensifier plate.

Further, when the divider 12 has spectral characteristics and can separate λl and λ2, the filters 17 and 18 can be omitted.

Further, when the light from the recording plate 10 includes many wavelength components, the wavelength components are λ1. It is also possible to divide into two groups represented by λ2, so that all the energy contributes to regeneration.

In particular, the apparatus according to the present invention is expected to find wide application in areas where optical lenses cannot be used, for example in X-ray images.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of a coding plate, Fig. 2 is a schematic diagram showing a conventional method of reproducing a recorded image encoded with a single coding plate, and Fig. 3 is the basis of the device of the present invention. FIG. 4 is a schematic diagram illustrating an embodiment of the device according to the present invention, and FIG. 5 is a sectional view showing an embodiment of a decoding plate. 1.-Image source 2..Coding plate 3..Recording plate 4..Arithmetic processing unit 5..Reproducing image plate 6.-.Decoding plate (bij) 7..Reproducing image plate 10. . . . Recording plate (scintillator) 11 . . . Decoding plate (a′1j) 12 . . . Light splitter 13 . ... Reproduction device 17 ... Filter (λ1
)18...Filter (λ2)19-...Scanning signal source patent applicant Hamamatsu Television Co., Ltd. agent Patent attorney Noro Ju procedural amendment November 6, 1980 Haruki Shimada, Commissioner of the Japan Patent Office 1, Case Showa era Patent Relationship with Kenbe No. 159325 Patent applicant address Name Hamamatsu Te' and Co., Ltd. 4 Agent 〒 160 6 Number of inventions increased by amendment Amended as shown in the attached sheet (Japanese Patent Application No. 56-159325) 2, page 8 m7, line 8 of the specification “Filters 111, 113
J is corrected to "Filter 121, 123J" 0 2, "Filter η" written on the 10th line of page 8 "Corrected to filter 122J" 3, i1! alJ:r IJ
Cacij) J. that's all

Claims (1)

[Claims] a coding plate having a constant code hole distribution and transmitting light from an image source; and converting or intensifying the image inputted by the coding plate to produce separable light containing first and second wavelengths. A recording plate that generates an output and a code hole having a distribution equivalent to that of the coding plate transmit light including the first wavelength, and code holes having a complementary distribution transmit light including the second wavelength. a decoding plate that transmits the signal; a light splitter that splits the decoding slope output without deforming it; and a light splitter that splits the decoded slope output without deforming it; a first imaging device that converts the second wavelength component into an electric signal, and a first imaging device that converts the decoded image containing the second wavelength component into an electrical signal; a second imaging device that outputs the first and second imaging devices, an arithmetic unit that maintains correspondence between output pixels of the first and second imaging devices and outputs the difference, and a reproduction device that reproduces the output of the arithmetic unit into an image. A device for reproducing images encoded on a conversion plate.