JPS61289785A - Dot light source position detector - Google Patents

Abstract

PURPOSE:To detect a dot light source position at high accuracy by changing approximately the dot-like light source image of a dot light source to a cross- shaped optical image by means of a cross filter. CONSTITUTION:A cross filter 2 changes approximately the dot-like light source image to a cross-shaped light source, and a lens 3 forms the images on photoarray sensors 4-7. A photoelectric transfer element imaged on the projecting part of the nearly cross-shaped optical image detects said sensors 4-7. Then a dot light source position detecting circuit 12 calculates the means X3 of image forming positions X1 and X2 detected by image forming position detecting circuits 8 and 10, and detects the position in the horizontal direction of the dot light source 1. In the same manner, a dot light source position detecting circuit 13 detects a position Y3 in the vertical direction of the dot light source 1 from image forming positions Y1 and Y2 detected by image forming position detecting circuits 5 and 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a point light source position detection device for detecting the position of 40 point light sources of LEDs (light emitting diodes) or halogen lamps.

[Conventional technology]

Although there are various devices for detecting the position of a point light source, a conventional point light source position detection device will be described below. The first device is a combination of a television camera and digital image processing circuitry. The position detection accuracy of a point light source is determined by the resolution obtained by dividing the measurement field of view by the number of pixels, and is 11512 in both the horizontal and vertical directions for a normal television camera. In addition, instead of the television camera 2, a two-dimensional photo matrix image sensor (for example,
COD cameras, etc.), it is 1/400. In addition, it takes several seconds for a television camera to detect the position of a point light source based on the image signal obtained by the seven omatrix image sensors.

A second device is a combination of a television camera and an analog light spot detector. The position detection accuracy of the point light source is the same as the first device, and the position detection time is 1/60.
It is about seconds.

A third type of device is one called an image dissector type using a photomultiplier tube.

This focuses the electron beam generated from the position of the light spot imaged on the photomultiplier tube onto the aperture, and the position of the point light source is determined by the magnitude of the voltage applied to the deflection coil to focus the electron beam. It is now detected.

The position detection accuracy of this device is approximately the same as that of the first device.
It is 1500.

A fourth device uses a semiconductor device detector. This images a point source onto the semiconductor device detector,
The position of the point light source is detected from the photocurrent corresponding to the imaging position. The position detection accuracy is about 1/100.

[Problem that the invention seeks to solve]

The position detection accuracy of conventional point light source position detection devices is 1/100.
~11512, the position detection time is several seconds to 1/60 seconds, so there was a problem that the position of the point light source could not be detected with high precision and in a short time.

In addition, in order to increase the linear resolution of the first device using a 7-otomatrix image sensor by one order of magnitude, the number of photoelectric conversion elements must be increased by 100.
It has to be more than doubled.

Manufacturing such a 7-otomatrix image sensor has a poor yield, and it cannot be said to be an effective means for increasing resolution.

Furthermore, the photomultiplier tube used in the third device is a special type and is susceptible to shocks. The lens that affects the measurement range is a regular C lens.
Since a CTV lens cannot be used, the measurement range is limited.

Furthermore, the fourth device has the disadvantage that it is easily affected by external light.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a point light source position detection device that has a short position detection time and high position detection accuracy.

[Means for solving problems]

Therefore, in the present invention, substantially V-shaped or substantially U-shaped grooves are formed in a lattice pattern, and a cross filter that changes a point light source image of a point light source into a substantially cross-shaped light image is arranged in a substantially rectangular shape. Four photo array image sensors each form an image of the four protruding parts of the cross-shaped optical image, and each photo of each protruding part of the approximately cross-shaped optical image is determined based on each photoelectric conversion output of each photo array image sensor. The image forming position detection circuit detects each image forming position on the array image sensor, and the average value of the image forming positions obtained from the 7 opposing automatic array image sensors is calculated to detect the position of the point light source. A point light source position detection device is constructed from the point light source position detection circuit.

[Effect]

In the point light source position detection device with the above configuration, the cross filter changes the point light source image of the point light source into a substantially cross-shaped light image, and this substantially cross-shaped light image is incident on four photo array sensors arranged in a rectangular shape. let Next, an N incident position detection circuit detects the respective incident positions of each protruding portion of the approximately cross-shaped light image on each photo sensor array based on each photoelectric conversion output of each photo array sensor, and a point light source position detection circuit faces the N incident position detection circuits. The position of the point light source is detected by calculating the average value of the incident positions obtained from the photo array sensor.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a point light source position detection device according to the present invention. In FIG. 1, 1 is a wide point light source, 2 is a substantially V-shaped or substantially U-shaped groove formed in a lattice shape, and changes the point light source image of the point light source 1 into a substantially cross-shaped light image. A cross filter, 6 is a lens, 4°5.6 and 7 are arranged in a rectangular shape, each of which has a plurality of photoelectric conversion elements arranged in a line. Photo array image sensor, 8.9.10 and 1
1, a substantially cross-shaped optical image is generated by detecting which positions of the photoelectric conversion elements of the photo array image sensors 4, 5, 6, and 7 each of the four protruding portions of the substantially cross-shaped optical image are imaged. Imaging position detection circuits 12 and 13 respectively detect the respective imaging positions of the protrusions of the photo array image sensors 4 and 6 and the photo array image sensors 5 and 7 facing each other. This is a point light source position detection circuit that calculates the average of the image formation positions and detects the horizontal and vertical positions of the point light source 1.

Next, the overall operation of the point light source position detection device according to the present invention will be explained. First, the point light source 10 point light source image is changed into a substantially cross-shaped light image by the cross filter 2, and the image is formed on the photo array sensors 4 to 7 by the lens 6.

As shown in FIG. 2, this substantially cross-shaped optical image is formed by four protrusions formed on the photo array image sensors 4 to 7, respectively. Each photo array image sensor 4~
7, a photoelectric conversion element on which a protruding portion of a substantially cross-shaped optical image is formed detects this. Next, the imaging position detection circuits 8 to 11 respectively correspond to the photo array image sensors 4 to 11.
Each photo array image sensor 4 to 7 is connected to each protruding portion of the letter-shaped light beam in one path according to each photoelectric conversion output Kl of 7.
Detect the imaging position. For the photo array image sensors 4 and 6 placed in the horizontal direction, this imaging position is detected as distances X and Xt from the left end of each sensor 4 and 6, respectively. Further, for the photo array image sensors 5 and 7 placed in the vertical direction, the imaging positions are detected as distances Y and Y from the bottom ends of the respective sensors 5 and 7.

Next, the point light source position detection circuit 12 is connected to the imaging position detection circuit 8.
and the imaging position X detected by 10, and the average Xs of Xt
(Xs '' (X+ +xt) / 2) to detect the horizontal position of the point light source 1.Similarly, the point light source position detection circuit 16 calculates the imaging position Y of the imaging position detection circuits 5 and 7, and Y, vertical position Ys of point light source 1
(Ys - (Y+ + Yt) / 2) is detected.

In addition, in this embodiment, since the imaging position detection circuits 8 to 11 are provided corresponding to each of the photosensor arrays 4 to 7, the point light source 1
The position of the image can be detected in a short time, but if it is okay if it takes a little time, it is possible to use only one imaging position detection circuit.
The photoelectric conversion outputs of the shear odometer arrays 4 to 7 may be sequentially input to the imaging position detection circuit by switching a switch.

[Effect of revelation]

As explained above, according to the present invention, the point light source image of the point light source is changed into a substantially criss-cross light image by the cross filter, so that the point light source image is enlarged vertically and horizontally, and each of the substantially crisscross-shaped light images is An imaging position detection circuit detects the position imaged on a 7-photo array image sensor with protrusions arranged in a rectangular shape, and a point light source position detection circuit detects the average value of the imaging positions as the position of the point light source. As a result, a point light source position detection device capable of detecting the position of a point light source with high accuracy is obtained.

Further, the position of the point light source can be detected in a short time by detecting the image formation position and calculating the average value of the image formation position.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a point light source position detection device according to the present invention, and FIG. 2 is an explanatory diagram showing the formation of a substantially cross-shaped light image on a 7-auto array image sensor. 1... Point light source, 2... Cross filter, 3
-3. Lens, 4.5.6.7... Photo array image sensor, 8, 9.10.11... Imaging position detection circuit, 12.13... Point light source position detection circuit.

Claims (3)

[Claims] (1) Approximately V-shaped or approximately U-shaped grooves are formed in a lattice shape,
a cross filter that changes a point light source image of a point light source into a substantially cross-shaped light image; and four photo array image sensors that are arranged in a rectangular shape and image each of the four protrusions of the substantially cross-shaped light image. and an imaging position detection circuit that detects the imaging position of each protrusion portion of the substantially cross-shaped optical image on each of the photo array image sensors based on each photoelectric conversion output of the photo array image sensor; A point light source position detection device comprising: a point light source position detection circuit that calculates an average value of image formation positions obtained from the opposing photo array image sensors to detect the position of the point light source. (2) The point light source position detection device according to claim 1, wherein the incident position detection circuit is provided corresponding to each of the four photo array sensors. (3) The point light source position detecting device according to claim 1, wherein the incident position detecting circuit has a changeover switch so that the detection outputs of the four photo array sensors are sequentially input.