JP2002031517A - Image detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-dimensional image and a three-dimensional device by using a common light emitting device. SOLUTION: A first or a second projected pattern P or Q is formed from a flash (laser beam) outputted from a light emitting element, and projected on the surface of a measured object S. The first projected pattern P comprises a bright part P1 formed by the radiation of laser beam thereon and a dark part P2 not radiated by the laser beam thereon. The second projected pattern Q is supplementary to the first projected pattern P, and comprises a bright part Q1 formed at the portion of the first projected pattern P corresponding to the dark part P2 thereof and a dark part Q2 formed at the portion of the first projected pattern P corresponding to the bright part P1 thereof. The light beam reflected on the measured object is detected by a CCD. A secondary image is detected from an image data obtained by the first projected pattern P and an image data obtained by the second projected pattern Q. Also, a three- dimensional image is detected from the image data obtained by the first or second projected pattern by using a pattern projection method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image detecting apparatus for detecting a three-dimensional image, that is, a three-dimensional shape of an object to be measured by using a so-called pattern projection method.
The present invention relates to an image detection device capable of obtaining not only a two-dimensional image but also a two-dimensional image.

[0002]

2. Description of the Related Art Conventionally, in an image detecting apparatus of this type, a three-dimensional image is obtained by projecting, for example, a laser beam having a stripe pattern onto an object to be measured, and projecting the image of the projected pattern onto the reflected light from the object to be measured. Is detected by an area sensor comprising a CCD. On the other hand, the two-dimensional image is obtained by irradiating an object to be measured, that is, a subject with strobe light, and an area sensor, similarly to a normal camera.

[0003]

As described above, since the illumination light required for a two-dimensional image and a three-dimensional image are different from each other, it has conventionally been necessary to provide two light emitting devices. For this reason, the conventional image detection device has a problem that the configuration is complicated and it is difficult to reduce the manufacturing cost.

An object of the present invention is to provide an inexpensive image detecting device which can detect a two-dimensional image and a three-dimensional image without providing two light emitting devices, and has a simple structure.

[0005]

According to the present invention, there is provided an image detecting apparatus comprising: a light source for emitting a flash; first projection pattern forming means for forming a first projection pattern from the flash and guiding the first projection pattern to an object to be measured; A second projection pattern complementary to the first projection pattern is formed from flash light and guided to the object to be measured.
Projection pattern forming means, and three-dimensional image detecting means for detecting a distance to each point on the surface of the measured object by detecting reflected light generated on the measured object by the first or second projection pattern. And a two-dimensional image acquiring means for obtaining a two-dimensional image of the measured object by detecting reflected light generated on the measured object by the first and second projection patterns.

It is preferable that the first and second projection pattern forming means are constituted by a common member. In this case, the first and second projection pattern forming means are, for example,
The liquid crystal filter includes a liquid crystal filter and liquid crystal filter control means for controlling the transmittance of each cell of the liquid crystal filter to form first and second projection patterns. According to this configuration, the first and second projection patterns can be freely formed, and the control is simple.

[0007] The first and second projection patterns are, for example, fringes, and preferably, the phases of the fringes of the first and second projection patterns are shifted by a half cycle. According to this configuration, since the projection pattern is simple, the control operation by the first and second projection pattern forming means is simplified.

[0008] The two-dimensional image obtaining means combines the first image data obtained based on the first projection pattern and the second image data obtained based on the second projection pattern. Obtain a two-dimensional image. In this case, for example, the two-dimensional image acquisition unit selects pixel data having a relatively high luminance value from the pixel data forming the first and second image data, and synthesizes the selected pixel data. Obtain a two-dimensional image.

A second image detecting apparatus according to the present invention comprises: a light source for emitting a flash; a plurality of projection pattern forming means for forming projection patterns different from each other from the flash and leading the projection pattern to an object to be measured; A three-dimensional image detecting means for detecting a distance to each point on the surface of the object to be measured by detecting reflected light generated on the object to be measured by any one of them, and a light source for the object to be measured by all of a plurality of projection patterns. And a two-dimensional image acquiring means for acquiring a two-dimensional image of the measured object by detecting reflected light.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a camera provided with an image detection device according to an embodiment of the present invention.

A finder window 12 is provided at the upper left of the taking lens 11 on the front of the camera body 10.
A light emitting device (light source) that emits flash light, which is laser light, on the upper surface of the camera body 10 and directly above the taking lens 11
50 are provided. The light emitting device 50 irradiates, for example, a plurality of linear lights extending in the horizontal direction, that is, slit lights, to an object to be measured (not shown).

On the left side of the light emitting device 50, a release switch 15 and a liquid crystal display panel 16 are provided. On the left side of the light emitting device 50, a slide switch 17 for selecting one of a distance detection mode (D mode) for detecting a three-dimensional image and an image acquisition mode (V mode) for acquiring a two-dimensional image is provided. ing.

On the side surface of the camera body 10, a card insertion slot 19 for inserting a recording medium such as an IC memory card is formed, and a video output terminal 20 and an interface connector 21 are provided.

FIG. 2 is a block diagram showing a circuit configuration of the camera shown in FIG. An aperture 25 is provided in the taking lens 11. The opening of the aperture 25 is determined by the iris drive circuit 2.
Adjusted by 6. The focus adjustment operation and the zooming operation of the taking lens 11 are controlled by a lens drive circuit 27.

An image pickup device (C
CD) 28 is provided. A subject image is formed on the CCD 28 by the photographing lens 11, and charges corresponding to the subject image are generated. Operations such as a charge accumulation operation and a charge read operation in the CCD 28 are controlled by the CCD drive circuit 30. The charge signal, that is, the image signal, read from the CCD 28 is amplified by the amplifier 31 and the A / A
The data is converted into digital image data in the D converter 32. The image data is subjected to processing such as gamma correction in the imaging signal processing circuit 33, and is temporarily stored in the image memory 34. Iris drive circuit 26, lens drive circuit 27,
The CCD drive circuit 30 and the image signal processing circuit 33 are controlled by a system control circuit 35.

Image data is read from the image memory 34 and supplied to the LCD drive circuit 36. The LCD drive circuit 36 operates according to the image data, whereby an image corresponding to the image data is displayed on the image display LCD panel 37.

The image data read from the image memory 34 is sent to a TV signal encoder 38, and can be transmitted via a video output terminal 20 to a monitor device 39 provided outside the camera body 10. The system control circuit 35 is connected to the interface circuit 40, and the interface circuit 40 is connected to the interface connector 2
1 connected. Therefore, the image data read from the image memory 34 is transmitted to the interface connector 2
1 can be transmitted to the computer 41 connected thereto. The system control circuit 35 is connected to the image recording device 43 via the recording medium control circuit 42. Therefore, the image data read from the image memory 34 is
The data can be recorded on a recording medium M such as an IC memory card mounted on the image recording device 43.

A light emitting element control circuit 44 is connected to the system control circuit 35. The light emitting device 50 includes a light emitting element 51, a pattern projection lens 52, and a liquid crystal filter 5.
3 The light emitting operation of the light emitting element 51 is controlled by the light emitting element control circuit 44. The light emitting element 51 emits a flash of laser light, and this laser light is emitted to the outside via a pattern projection lens 52 and a liquid crystal filter 53. The liquid crystal filter 53 includes a portion through which the laser beam passes and a portion through which the laser beam does not pass, whereby a predetermined projection pattern is formed from the laser beam.

The liquid crystal filter 53 has a number of cells. Each cell is set to either a state in which laser light is transmitted or a state in which laser light is not transmitted. That is, as shown in FIG. 3, the first or second projection patterns P and Q are formed from the flash emitted from the light emitting element 51 and projected onto the surface of the measurement target S. The first projection pattern P includes a bright portion P1 formed by irradiating a laser beam,
A dark portion P2 not irradiated with laser light, and a bright portion P1.
The dark portion P2 and the dark portion P2 both have a band shape extending in the horizontal direction and having a certain width. The second projection pattern Q is complementary to the first projection pattern P, and has a bright portion Q1 formed at a portion corresponding to the dark portion P2 of the first projection pattern P.
And a dark portion Q2 formed at a portion corresponding to the bright portion P1 of the first projection pattern P. The transmittance of each cell of the liquid crystal filter 53 is controlled by a liquid crystal filter driving circuit 54 that operates according to a command signal output from the system control circuit 35.

As described above, the first and second projection patterns are obtained by the liquid crystal filter 53 which is a common member. In the example of FIG. 3, the first and second projection patterns P and Q are stripes extending in the horizontal direction, and the phases of the stripes of these patterns P and Q are shifted by a half cycle. The present invention is not limited to this, and may be, for example, a checkered pattern.

The light reflected from the object to be measured enters the photographing lens 11. By detecting the reflected light generated by the first or second projection pattern by the CCD 28, a distance to each point on the surface of the measured object, that is, a three-dimensional image is detected based on the pattern projection method. That is, when detecting a three-dimensional image, one of the first and second projection patterns is used. Since the detection of a three-dimensional image by the pattern projection method is well known, description thereof will be omitted.
In this measurement, the control of the transfer operation timing and the like in the CCD 28 is performed by the system control circuit 35.
Is performed by the CCD drive circuit 30.

A switch group 45 having a release switch 15 and a slide switch 17 and a liquid crystal display panel (display element) 16 are connected to the system control circuit 35.

FIG. 4 is a flowchart of a processing routine for detecting a two-dimensional image of the measured object. This routine is executed when the release switch 15 is pressed while the slide switch 17 is set to the V mode. The camera is set at a position such that all of the projection patterns formed on the surface of the day measurement object fall within the angle of view.

As an initial state, the liquid crystal filter 53 is controlled so that a first projection pattern is formed from the flash of the light emitting element 51. In step 101, the counter N
Is set to the initial value 1. In step 102, pattern projection is performed on the measured object. Counter N is 1
When, the first projection pattern is formed on the surface of the measured object. In step 103, the reflected light generated on the measured object by the first projection pattern
8 and stored in the image memory 34 as first image data.

In step 104, it is determined whether or not the counter N is equal to two. When the counter N is 1,
Step 105 is executed, and the counter N is incremented by one. In step 106, the transmission state of each cell of the liquid crystal filter 53 is changed by the liquid crystal filter driving circuit 54, and the liquid crystal filter 53 is determined so that the second projection pattern is formed.

Then, step 102 is executed again, and a second projection pattern is formed on the surface of the measured object. That is, in step 103, the reflected light generated on the measured object by the second projection pattern is detected by the CCD 28 and stored in the image memory 34 as the second image data.

Next, at step 104, since it is determined that the counter N is 2, the routine proceeds to step 107. That is, the first and second image data are read from the image memory 34. In step 108, pixel data having relatively high luminance values in mutually corresponding pixels of the first and second image data are selected and synthesized, and
A two-dimensional image is obtained. If the luminance values of the two image data are the same, the pixel data of the first image data is selected. In step 109, the image data constituting the two-dimensional image is stored in the image recording medium M, and this routine ends.

As described above, in the present embodiment, the light emitting device 50 that emits flash light in order to obtain a two-dimensional image and a three-dimensional image.
Are common. Therefore, the configuration of the image detection device is more complicated than in the conventional configuration in which separate light emitting devices are provided, and the manufacturing cost can be reduced.

In the present embodiment, the first and second projection patterns are formed by using the liquid crystal filter 53.
The projection pattern can be freely formed by controlling the transmittance of each cell of the liquid crystal filter 53, and the control is simple. In particular, the first and second projection patterns are stripes shifted from each other by a half cycle, in other words, black and white are inverted. Therefore, the liquid crystal filter 53
The operation of controlling the transmittance of each cell in the first projection pattern and the second projection pattern only requires reversing the transmittance of each cell, and is simple.

FIG. 5 shows an image detecting apparatus according to another embodiment. In this embodiment, the light emitting device 60 is an external strobe device that is detachable from the camera body 10. That is, the light emitting device 60 has the contact member 62 that can be connected to the hot shoe 61 provided on the upper surface of the camera body 10. Since the first and second projection patterns are formed by the light emitting device 60, the same effects as those of the image detecting device of the first embodiment shown in FIGS. 1 and 2 can be obtained.

The number of projection patterns formed on the surface of the object to be measured is not limited to two, but may be three, for example. That is, in this case, the three projection patterns are mutually 1
Out of phase by 20 °, a two-dimensional image is obtained by combining three images.

[0032]

As described above, according to the present invention, a two-dimensional image and a three-dimensional image can be detected using a common light emitting device, so that the configuration of the image detecting device is simplified and the manufacturing cost is reduced. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a camera provided with an image detection device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of the camera shown in FIG.

FIG. 3 is a diagram illustrating an example in which first and second projection patterns are formed on a surface of a measurement target object.

FIG. 4 is a flowchart of a processing routine for detecting a two-dimensional image of an object to be measured.

FIG. 5 is an exploded perspective view showing an image detection device according to another embodiment.

[Explanation of symbols]

 50, 60 Light emitting device (light source) 51 Light emitting element 52 Pattern projection lens 53 Liquid crystal filter S Object to be measured

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) G06T 1/00 400 G01B 11/24 K 5C061 H04N 5/225 E 13/02 G02B 7/11 DF term ( Reference) 2F065 AA06 AA53 BB05 FF01 FF04 GG04 GG08 HH05 JJ03 JJ26 LL21 LL30 LL53 NN00 QQ03 QQ24 QQ31 SS02 SS13 2H051 AA00 BA72 BB29 CC05 2H083 AA15 AA52 5B047 AA07 BC03 ACB CB04 CB04

Claims (8)

[Claims] 1. A light source for emitting a flash, a first projection pattern forming means for forming a first projection pattern from the flash and guiding the first projection pattern to an object to be measured, and complementary to the first projection pattern A second projection pattern forming means for forming a second projection pattern from the flash and leading to the object to be measured; and detecting reflected light generated in the object to be measured by the first or second projection pattern. Thereby, three-dimensional image detecting means for detecting a distance to each point on the surface of the measured object, and detecting reflected light generated in the measured object by the first and second projection patterns, An image detection apparatus comprising: a two-dimensional image acquisition unit that obtains a two-dimensional image of the measured object. 2. The image detecting apparatus according to claim 1, wherein the first and second projection pattern forming means are constituted by a common member. 3. A liquid crystal filter control for forming the first and second projection patterns by controlling a liquid crystal filter and a transmittance of each cell of the liquid crystal filter by first and second projection pattern forming means. 3. The image detecting apparatus according to claim 2, further comprising: means. 4. The image detection apparatus according to claim 1, wherein the first and second projection patterns are stripes. 5. The image detection apparatus according to claim 4, wherein the phases of the stripes of the first and second projection patterns are shifted by a half cycle. 6. The first image data obtained based on the first projection pattern, wherein the two-dimensional image obtaining means includes:
The image detection apparatus according to claim 1, wherein the two-dimensional image is obtained by combining the image data with second image data obtained based on the second projection pattern. 7. The two-dimensional image acquisition means selects pixel data having a relatively high luminance value from the pixel data constituting the first and second image data, and combines the selected pixel data. The image detection apparatus according to claim 6, wherein the two-dimensional image is obtained by performing the operation. 8. A light source for emitting flash light, a plurality of projection pattern forming means for forming projection patterns different from each other from the flash light and guiding the projection pattern to the object to be measured, and the object to be measured by one of the plurality of projection patterns A three-dimensional image detecting means for detecting a distance to each point on the surface of the object to be measured by detecting reflected light generated in the object; and reflected light generated in the object to be measured by all of the plurality of projection patterns. And a two-dimensional image obtaining means for obtaining a two-dimensional image of the object to be measured by detecting the image.