JPS62183290A - Device for making rotary body image into standstill - Google Patents

Abstract

PURPOSE:To make an image stationary and to observe the image continuously by picking up the image of a rotary body with an image pickup camera, sampling said image with minute time intervals, processing the sampled instantaneous image by real time in accordance with a rotational angle around the center of rotation, and generating an image which is returned to an original reference position. CONSTITUTION:The image of the rotary body 1 is picked up by a TV camera 2, and respective picture element is converted to digital signals by an A/D converter 3, and the digital signals of a picture at a moment are stored in a memory device 4. When the observation is started by an external observation start signal, i.e., an observation start command from a set signal input device 10, an initial image A0 is set over the entire screen. The body 1 rotates around a point 0, and the angle of rotation is measured by a rotational angle pickup 8, and resulting value is made a signal by a rotational angle detector 9. The resulting signal is supplied to a computer 5. The computer 5 executes an angle coordinate conversion calculation, and the image is generated from picture signals thus converted sequentially. When displayed in a picture display device 7, thus generated image appears in still state at the reference position.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotating body image stilling device, and is particularly suitable for observing the flow of a flow path in a rotating body. The present invention relates to a rotating body image stilling device.

[Background of the invention]

As a conventional technology for this type of rotating body image stilling device, there is a manual for the Derotator System (CTH) manufactured by Elomag of Switzerland.
E EL, 0HAG IMAGE DEROTATOR
SYSTFM) 4. - There is a technology disclosed.

This conventional technique uses an optical system having a right-angle prism that rotates at 1/2 the rotational speed of a rotating body. Although this prior art is a simple system that is excellent in principle, it has the following first-order problems.

(1) Because there are mechanically moving parts that rotate the rectangular prism, its reliability requires high-precision machining, the use of long-life materials, and regular maintenance.

(2) In order to obtain a stable static image, it is necessary to rotate the right-angle prism at half the speed of the rotating body and at a synchronized speed, and a device that controls the rotation speed with high precision is required.

(3) In the case of a rotating prism, it is necessary to align the axis of the rotating body as an object to be observed with the axis of the optical system, which requires time.

(4) In order to obtain a large static image, a large prism is required, and the portion of one revolution becomes large, making manufacturing difficult.

[Purpose of the invention]

An object of the present invention is to solve the problems of the prior art described above, and to use an electrical image processing method instead of a mechanical method to freeze the image of a rotating object and continuously observe it. The object of the present invention is to provide a rotating body image stilling device that is possible.

[Summary of the invention]

The present invention includes an imaging camera that photographs a rotating body, a storage device that temporarily stores image signals obtained by this imaging camera, a computer that performs coordinate conversion calculation processing for one image and control of the entire device, and processing performed by this computer. The image display device is configured to include an image display device that displays the image signal obtained by the rotation, and rotation angle detection means that detects the rotation angle of the rotating body and outputs a detection signal to the computer.

In one aspect of the present invention, an image of the rotating body is taken with an imaging camera,
The images are sampled at minute time intervals, and the sampled instantaneous images are processed in real time according to the rotation angle from the rotation center to generate an image returned to the original reference position, so that the rotating body always remains at the reference position. It is possible to obtain images one after another of the state in which it appears.

Thereby, the image of the rotating body as the rotating object to be observed can be made still and continuously observed.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram of image coordinate transformation calculation processing.

The rotating body image stilling device of the embodiment shown in FIG. 1 includes a television camera 2 as an imaging camera that photographs the rotating body 1;
An A/D converter 3, a storage device 4, a computer 5, a rotation angle pickup 8 for the rotating body 1, and a rotation angle detector 9,
The device includes a set signal input device, a D/A converter 6, and an image display bag @7.

In FIG. 1, a propeller fan rotating in the atmosphere is shown as a rotating body 1 as an object to be observed.

Other turbomachinery (pumps, water turbines, compressors).

The present invention may be applied to any object in which it is necessary to observe the surface or internal state of a rotating body that rotates at high speed, such as an impeller of a steam turbine, a marine propeller, etc., an automobile tire, a magnetic recording disk, a centrifugal separator, or the like.

The television camera 2 is configured to photograph the rotating body 1 and output it as an analog or digital image signal.

The A/D converter 3 is configured to convert an image signal outputted from the television camera 2 into a digital signal if it is an analog signal.

When the image signal of the television camera 2 is a digital signal, the storage device 4 directly captures the image signal from the television camera 2 in response to a command to start operation from the set signal input device 10, and stores the image of the television camera 2. If the signal is an analog signal.

Image signals are taken in from the A/D converter 3 and temporarily stored as image data necessary for calculation processing.

The computer 5 is configured to perform image coordinate conversion calculation processing and control of the entire apparatus. In the coordinate transformation calculation process of the image by the computer 5, the set signal input device 10
According to the command to start observation, the memory bag! The image converted into a digital signal is captured from the i4, and the rotation angle detector 9
The rotation angle detection signal of the rotary body 1 is taken in from the rotary body 1, and the coordinate points of the image converted into digital signals are returned to their original positions according to the rotation angle of the rotary body 1.

The rotation angle pickup 8 and the rotation angle detector 9 constitute rotation angle detection means for detecting the rotation angle of the rotating body 1 and outputting a detection signal thereof to the computer 5.

The D/A converter 6 converts the digital image signal coordinate-converted by the computer 5 into an analog image signal.

When the processing result of the computer 5 is an analog image signal, the image display device 7 directly converts and displays the output of the computer 5 as an image, and when the processing result of the computer 5 is a digital image signal, the image display device 7 displays the output of the computer 5 as an image signal. The output converted into an analog image signal by the /A converter 6 is converted into an image and displayed.

The rotating body image stilling device of the above embodiment is controlled and operated as follows.

That is, an image of the rotating body 1 is taken by the television camera 2, and an image signal is output from the television camera 2. If the image signal output from the television camera 2 is a digital signal, it is directly sent to the storage device 4; if the image signal is an analog signal, it is sent directly to the storage device 4.

Each pixel is converted into a digital signal by the A/D converter 3, and the digital signal of one screen at a certain moment is stored in the storage device 4.

Then, when observation is started by a signal to start observation from the outside, that is, a command to start N1 observation from the set signal input device 10, the initial image /Ao is set over the entire screen.

FIG. 2 shows the movement of one representative point A in the initial image AO.

It is now assumed that the rotating body 1 is rotating counterclockwise around the point O in the second v4. That is, if point A is at position Ao at time To, then after 61 hours, point A rotates by an angle (01-00) around point 0 and comes to position AI.

After the next 61 hours, the angle (02-00) is further rotated and A2. come to the position. Then, after nΔT time, it rotates by an angle (θ.-00) and comes to the position An. These rotation angles are measured by a single rotation angle pickup 8, converted into a signal by a rotation angle detector 9, and the detected signal is sent to the computer 5.

Therefore, the calculator 5 determines that when point A comes to position A1,
Calculate the movement angle (Ol-00), rotate A1 counterclockwise by that angle, and Ax becomes 0-A.

Coordinate transformation calculation is performed so that it lies on the line.Furthermore, after T time to the next time, the movement angle (θz
Qo) is calculated, and a coordinate transformation calculation is performed to rotate Az clockwise by that angle so that -At is on the 0-Ao line. Similar coordinate transformation calculations are performed sequentially up to A.

Although only one point A has been described above, coordinate transformation calculations are also performed in a balanced manner for all other points (pixels) B, C, D, . . . in one image.

Then, the successively converted image signal is converted into an image and displayed on the image display device 7.

By processing in this way, the image rotating around the point O will always rotate in the opposite direction to the rotation direction of the rotating body 1 by the movement angle rotated from the reference position, so that it will not return to the reference position. Appears to be stationary.

〔Effect of the invention〕

According to the present invention described above, there is provided an imaging camera that photographs a rotating body, a storage device that temporarily stores image signals obtained by the imaging camera, and a computer that performs coordinate conversion calculation processing of images and controls the entire device. .

The structure includes an image display device that displays an image signal processed by this computer, and a rotation angle detection means that detects the rotation angle of a rotating body and outputs a detection signal to the computer. Regardless of method.

The electrical image processing method has the effect of making it possible to freeze images of a rotating object to be observed and continuously observe them. As a result, the reliability of the device can be dramatically improved, the entire device can be simplified, and tasks such as aligning the axis of the rotating body as the vA object and the optical system can be performed. It has additional effects such as being able to omit the process and easily connecting to an image processing device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of image coordinate transformation calculation processing.

Claims (1)

[Claims] 1. An imaging camera that photographs a rotating body, a storage device that temporarily stores image signals obtained by this imaging camera, and a computer that performs coordinate conversion calculation processing of images and controls the entire device;
An image of a rotating body, comprising an image display device that displays an image signal processed by the computer, and a rotation angle detection means that detects a rotation angle of the rotating body and outputs a detection signal to the computer. Stilling device.