JPH07101338B2 - Image reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention reads an image recorded on an image recording board and displays the read image by scanning in an XY address system. The present invention relates to an image reading device depicted in a means.

[Prior Art] Generally, scanning in an image processing apparatus is a method used for reading or writing (depicting) an image, and one image is decomposed into a large number of pixels, and each pixel is converted into an appropriate signal. In order to obtain a series of signal sequences, or conversely, each signal of the series of signal sequences that is image information is converted into an array of pixels in order according to a promise, and an image that is a set of pixels. The operation to do.

Now, when performing scanning, how to decompose the pixels and in what order the signals are read out is also a promise when passing signals, so it is simpler and technically rational. Is required.

The most well-known scan to date is the XY address scan (hereinafter referred to as XY scan).

Further, although it is a special scan, the applicant of the present invention displays the position on the image recording board in polar coordinates and displays the image on the image recording board as a scanning excellent in reading an image of a concentric circle shape or the like. Scanning (hereinafter referred to as circumferential scanning) in which reading is performed in a concentric or spiral shape has been proposed.

The above-mentioned XY scanning and circumferential scanning will be briefly described as follows.

The XY scan is a scan used in a commercially available image display means, for example, a display CRT typified by a television,
A rectangular screen is used, the orthogonal coordinates are taken in the X direction (horizontal direction) and the Y direction (vertical direction), and a pixel array arranged vertically and horizontally is created.
The signals are read out in order from the pixels arranged in a line in the X direction, and when one line is completed, the signal is shifted one step in the Y direction,
The signal is read again in order in the X direction, and the process is repeated until all columns are completed.

On the other hand, the above-mentioned circumferential scan is a scan used in the X-ray image reading apparatus invented by the inventor of the present invention, and as shown in FIG. 3, the image is a group of concentric circles (r _m , r _m-1 , ... r ₀ ) and a family of half-lines (θ _n , θ _n-1 ,, θ) from the pole (rotation center) O
₀ ) and a plurality of pixels (G _{m, n} , G _{m−1, n−1} ... G _{O, O} ) arranged radially and concentrically with respect to the pole O, and having the same circumference. The operation of reading the pixels arranged in the upper part in order by converting them into signals is repeated for each circumference.

According to the circumferential scanning, when the image recorded on the image recording disk is, for example, an X-ray diffraction image of a crystal structure material, which has a concentric circle shape or a similar shape, the image is recorded. It is possible to efficiently scan only the recorded circular range (which is a very small range when compared with the total area of the recording surface of the recording board), and the image condition and content (crystal orientation) (Image information and granularity information) can be obtained enough image information.

In other words, the amount of information actually read and processed during reading scanning can be suppressed to a very small amount, the processing time required for reading can be shortened, and the capacity of the processing device can be reduced.

Also, to display the position on the image recording board in song coordinates,
When the image has a concentric circle shape or a similar shape, there is an advantage that the position information itself can be used for grasping the shape of the image.

[Problems to be Solved by the Invention] Now, in manufacturing an image reading apparatus for reading and describing a concentric image or a similar image,
If the above-mentioned circumferential scan is used for the scanning for reading the image and the above-mentioned XY scanning is used for the scanning for writing, the reading of the image can be efficiently performed and the image display can be performed. As a means, it is possible to use a widely available commercial product, and it should be possible to obtain great merits in terms of facilitating the management of parts and the like and also in reducing the manufacturing cost.

However, it has been found that when the circumferential scanning and the XY scanning are simply combined, a problem occurs in terms of the amount of image information to be read out or the precision of the image to be drawn.

For example, when the distance between the pixels in the X-Y scanning in the X direction and the Y direction is a, as shown in FIG.
In the circumferential scanning, the interval between the concentric circles in the radial direction is selected as a, and the declination of each half line (the angle between the starting line θ and each half line) ψ ₁ , ψ ₂ ... It is assumed that the distances between the pixels arranged on the circumference r are selected to be a.

However, as shown in FIG. 4, the pixel arrangement in the case of the circumferential scanning (the arrangement of the position where the image information is read out on the image recording board, the arrangement indicated by ● in the figure) A and the case of the XY scanning are used. The pixel array (array indicated by ◯ in the figure) B has a large difference in the array itself, and it is not possible to simply associate pixels with each other.

Therefore, the pixels obtained by the circumferential scanning are shown in (a) and (b) in FIG.
As shown in (C) and (D), it is assumed that the pixel is approximated to the pixel closest to the pixel by the XY scanning, and that when the signal is transferred, the positional information in polar coordinates is converted into the positional information in rectangular coordinates. Not only coordinate conversion but also predetermined position correction processing is performed.

However, when processed in this way, pixel defects occur in the image displayed on the image display means, and there are pixels for adapting the circumferential scanning image array to the XY scanning image array. Due to the position correction, the position information of the pixel has a large error, which causes a problem that the accuracy of the drawn image is deteriorated.

This problem can be mitigated by the measure of increasing the image information collected by the circumferential scan. However, according to such a measure, the amount of information collected by the circumferential scan is shown in FIG. There is a problem that the original advantage of the circumferential scanning is lost, because it is necessary to increase the amount to twice the example.

The present invention has been proposed to solve the above-mentioned problems, and it is possible to efficiently read an image of a concentric circle shape or a similar shape by circumferential scanning, and further, to reduce the amount of read information. XY without increasing
An object of the present invention is to provide an image reading device capable of accurately drawing an image read on a scanning image display means.

[Means for Solving Problems] An image reading apparatus according to the present invention solves the above-mentioned problems by devising a pixel array in scanning for reading image information from an image recording board. As an effective means, an image information detecting means for scanning the image recording board to read the image recorded on the image recording board,
The image recording board and the image information detecting means, so that the scanning on the image recording board is performed in a concentric or spiral shape.
Position detection means for reading out the detection position of the image information on the image recording board by using polar coordinates, and image display means for forming an image by XY address scanning by arranging the pixels in alignment in two axial directions orthogonal to each other. And information conversion processing means for converting the position information in polar coordinates obtained by the position detecting means into position information in rectangular coordinates in order to form an image on the image display means using the information obtained by the image information detecting means. In addition to the above, in the concentric or spiral scanning, the deviation angle of the reading position on each scanning circle is adjusted so that the reading positions of the image information of adjacent scanning circles do not overlap in the normal direction. Are set to be offset from each other between adjacent scanning circles.

[Operation] In the image reading apparatus according to the present invention, the image information is read from the image recording board by scanning the recording board in a concentric or spiral shape. In such a so-called circumferential scan, when the recorded image is, for example, an X-ray diffraction image of a crystal structure material, and has a substantially concentric circle shape or a similar shape, the image is recorded. Image information can be efficiently collected along the contour, and accurate reading can be efficiently performed.

In addition, in the circumferential scanning in this case, the declination of the reading position on each scanning circle is set so that the reading positions (pixel arrangement) of the image information of adjacent scanning circles do not overlap each other in the normal direction. The scanning circles are set so as to be offset from each other, and when the pixel array by this scanning is incorporated in the pixel array by the XY scanning, inconveniences such as duplication and omission are unlikely to occur, and the amount of information to be read is different. XY without increasing
An image can be accurately drawn on the scanning type image display means.

[Embodiment] FIG. 1 shows an embodiment of an image reading apparatus according to the present invention.

This image reading device scans a phosphor layer 1a of an image recording board 1 with excitation light 2 to read a radiation image recorded on the phosphor layer 1a, and the read radiation image is displayed on a CRT or the like. The image information detecting means 5, the driving means 6, the position detecting means 7, the above-mentioned image displaying means 3, the information conversion processing means 8 and the like are the basic constituent elements.

Hereinafter, each component will be described in detail in order.

The recording disk 1 is a disk 1b having a predetermined rigidity, and the phosphor layer 1a is layered on the surface of the disk 1b. The recording disk 1 is rotationally driven by a DC motor 9 around the center of the disk 1b. The DC motor 9 includes an encoder 11, a drive pulse generation circuit 12,
The rotation is controlled by the PLL circuit 13, the clock pulse generation circuit 14, and the like.

The phosphor layer 1a of the recording board 1 has a property of absorbing and accumulating radiation and emitting it according to the intensity of the accumulated radiation when the excitation light 2 is irradiated, and excites the phosphor layer 1a. An image is read out by detecting light 15 (hereinafter, referred to as “emission light”) due to light emission that occurs on the phosphor layer 1a when scanning with the light 2.

The image display means 3 is of an XY scanning type, and a commercially available display CRT is used. However, the image display means 3
The display CRT is not limited to the display CRT, and for example, a liquid crystal display, an electrochromic display, a plasma display, a light emitting diode or a panel display using electroluminescence, or the like can be used.

The image information detecting means 5 is for scanning the recording board 1 to read out an image recorded on the recording board 1. The light source 18 for generating the excitation light 2 and the photoelectron for detecting the emitted light 15 are provided. The excitation light 2 generated by the multiplier 19 and the light source 18 emits the excitation light 2 to the phosphor layer 1a.
The spot light is radiated upward and the emitted light 5 generated thereby is thinly provided in the photomultiplier tube 19 such as an optical path system 20. In this case, the photomultiplier tube 19 is provided with a filter (not shown) for cutting unnecessary light that causes disturbance in front of the light receiving surface. Further, the optical path system 20 is configured to include a first light ray reflecting member 20b such as a semi-transmissive mirror, a second light ray reflecting member 20b such as a total reflection mirror, and a condenser lens 20c.

The drive means 6 causes a predetermined relative movement between the recording board 1 and the image detecting means 5 so that the scanning on the recording board is performed in a concentric or spiral shape. The rotation of the recording board 1 and the recording board 1 of the optical path system 20.
To control the linear motion of the. Therefore, the DC motor 9 for rotatably driving the recording board 1 and its control system, and the drive mechanism for linearly moving the optical path system 20 in the image information detecting means 5 or a part thereof in the radial direction of the recording board 1 (not shown) ) And its control system 6a are components of the driving means 6. The tuning between the control system 6a and the control system on the recording board 1 side is performed through the frequency divider 22 connected to the PLL circuit 13, but scanning is performed using the driving means 6. As compared with the conventional circumferential scanning, the pixel arrangement and the like have been devised. This is as shown in FIG.

That is, in the conventional circumferential scanning, as shown in FIG. 3, all the pixels on the adjacent scanning circles are located on the common half line (θ, θ, ... θ) and the declination is the same. It is in the state of having done.

However, in the circumferential scan of this embodiment, in adjacent scan circles, pixels on the scan circles do not overlap each other in the normal direction (that is, do not lie on a common half line). The deviation angles of the pixels are set to be shifted.

In this case, the amount of shift is half the distance (pitch) in the circumferential direction of the pixels on one scanning circle. Further, as shown in FIG. 3, when the distance between the X-Y scanning pixel array in the X direction and the Y direction is a, the pitch of the pixels on the outermost scanning circle is a, and The radial spacing between matching scan circles is set to 0.87a.

The position detecting means 7 reads the detection position of image information on the recording board 1 (the position of spot irradiation, which is also the position of the pixel to be read) by using the song coordinates, and the spot irradiation position of the recording board 1 is read. A radial position detection sensor 7a for detecting a distance r from the center and a rotation angle detection sensor 7b for detecting a rotation angle θ with respect to the initial position of the recording board 1 are provided.

The signals detected by these sensors 7a, 7b are sent to the gate circuit 24. The gate circuit 24 is for sending image information to the information conversion processing means 8 via the I / O port 25.

The control signal of the DC motor 9 also passes through the frequency divider 22 and the AD (analog-digital) conversion circuit 26, and then the gate circuit.
Threaded on 24. Further, the image information detected by the image information detecting means 5 is also passed through the gate circuit 24 via the head pre-amplifier 27 and the AD conversion circuit 26.

The information conversion processing means 8 receives the information obtained by the image information detecting means 5 via the gate circuit 24 and the I / O port 25, and performs predetermined processing so that the information is adapted to the image display means 3. It is implemented by a microprocessor unit (MPU) 29, a first memory 30, a second memory 31, and the like.

The MPU 29 performs arithmetic processing such as coordinate conversion and correction of position information for adapting to XY scanning.

The first memory 30 stores the image information input to the MPU 29,
It is a RAM memory that is stored as it is displayed by song coordinates.

The second memory 31 stores V-RAM (or R-RAM) which stores the image information processed by the MPU 29 and outputs the image information when necessary.
AM) Memory.

In the image reading apparatus as described above, the image information is read from the image recording board 1 by scanning the recording board in a concentric or spiral shape. In such a so-called circumferential scan, when the recorded image is, for example, an X-ray diffraction image of a crystal structure material, and has a substantially concentric circle shape or a similar shape, the image is recorded. Image information can be efficiently collected along the contour, and accurate reading can be efficiently performed.

Moreover, the circumferential scanning in this case is performed so that adjacent scanning circles (for example, r _m and r _m-1 ) do not overlap each other's image information read positions (pixel arrangement) in the normal direction. The deviation angles (eg, ψ _m−1,1 and ψ _{m, 1} ) of the read-out positions on the scanning circles are set to be mutually offset between the adjacent scanning circles, and the pixel array by this scanning is XY When incorporated in a pixel array by scanning, inconveniences such as duplication and omission are unlikely to occur, and an image can be accurately drawn on an XY scanning type image display means without increasing the amount of information to be read out. .

According to an actual experiment, the conventional device shown in FIG. 3 has a problem that about 6% of pixel omission occurs at a position where the deviation angle is about 40 to 45 degrees. However, in the above-described embodiment, no inconvenience such as pixel overlap or omission occurs, and a good image without distortion can be drawn on the image display unit 3.

In the example, the shift amount of the deflection angle was set to the pitch 1/2 of the pixels on one scanning circle, but this shift amount is considered to be somewhat adjustable, and is strictly 1 / 2
Not limited to.

Also, in the case of this embodiment, the amount of information to be read is increased as compared with the case shown in FIG. 3 by setting the radial interval between adjacent scanning circles to 0.87a and compressing the interval. However, it can be considered that this is suppressed to such an increase because the pixels of the adjacent scanning circles are displaced in the circumferential direction as described above.

According to various experiments, for example, when trying to obtain a good image without missing pixels without shifting the deviation angle,
The pitch of the pixels on the outermost scanning circle must be set to about 0.7a, and the radial interval must be compressed to about 0.7a. Therefore, it is necessary to expect an increase in the image pair and the capacity of the apparatus in the processing time.

EFFECTS OF THE INVENTION As is clear from the above description, in the image reading apparatus according to the present invention, image information is read from the image recording board by scanning the recording board in a concentric or spiral shape. . In such a so-called circumferential scan, when the recorded image is, for example, an X-ray diffraction image of a crystal structure or the like and has a substantially concentric circle shape or a similar shape, the image is recorded. Image information can be efficiently collected along the contour, and accurate reading can be efficiently performed.

In addition, the circumferential scanning in this case is performed by setting the deviation angle of each scanning circular reading position between adjacent scanning circles so that the reading positions of the image information of adjacent scanning circles do not overlap each other in the normal direction. The pixel array by this scanning does not easily cause inconvenience such as duplication or omission when incorporated into the pixel array by XY scanning, and the amount of information to be read is not increased so much. An image can be accurately drawn on a Y scanning type image display means.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of an embodiment of an image reading apparatus according to the present invention, FIG. 2 is an explanatory view of an image arrangement on an image recording board in the embodiment, and FIG. 3 is a conventional circumferential scanning. 4 is an explanatory view of the image array in FIG.
FIG. 7 is an explanatory diagram of an operation of converting into a Y-scan pixel array. 1 ... Image recording board, 3 ... Image display means, 5 ... Image information detecting means, 6 ... Driving means, 7 ... Position detecting means, 8
...... Information conversion processing means.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09G 5/00 520 V 9471-5G 5/36 510 C 9471-5G 520 D 9471-5G H04N 3 / 00 5/253 7/01 Z

Claims (1)

[Claims] 1. An image information detecting means for scanning an image recording board to read out an image recorded on the image recording board, and the scanning on the image recording board is performed concentrically or spirally. , The image recording board and the image information detecting means, the position detecting means for reading out the detected position of the image information on the image recording board by using polar coordinates, and the pixels are aligned in two axis directions orthogonal to each other, and XY is arranged. Image display means for forming an image by scanning in the address system, and position information in polar coordinates obtained by the position detection means for forming an image on the image display means by using the information obtained by the image information detection means. An image reading device, comprising: an information conversion processing unit for converting position information in rectangular coordinates, for rendering an image recorded on the image recording board on an image display unit, wherein the concentric circles or spirals are provided. In scanning, the deviation angles of the reading positions on each scanning circle are set to be offset from each other so that the reading positions of the image information of adjacent scanning circles do not overlap in the normal direction. An image reading device characterized in that: