JPH08160151A - Device and method for detecting human body - Google Patents

Abstract

PURPOSE: To surely distinguish a high-temperature low-emissivity object from a high-emissivity low-temperature object so as to improve the human body detecting accuracy of a human body detecting device by taking the infrared image of the object in two states, a state where the objects are irradiated with infrared radiation and another state where the objects are not irradiated with the infrared radiation. CONSTITUTION: An extracting/control means CL3 creates a state where an infrared radiating means CL2 emits infrared radiation and another state where the means CL2 does not emit infrared radiation by controlling an infrared image pickup means CL1 and the infrared emitting means CL2. The control means CL3 inputs two pieces of infrared information which are obtained when the pickup means CL1 picks up infrared images in the above-mentioned two states and extracts infrared information in a prescribed temperature zone from the two sets of infrared information. When, for example, infrared radiation is emitted from the emitting means CL2, the images of reflected infrared radiation and infrared radiation emitted from an object itself are picked up in an overlapping state. When no infrared radiation is emitted, on the other hand, only the image of the infrared radiation emitted from the object itself is picked up. Therefore, a human body detecting means CL4 detects a human body distinguishing a high-radiation low-temperature object (human body) from among low- radiation high-temperature objects (background) based on the above-mentioned fact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detecting apparatus and a human body detecting method for detecting a human body using infrared rays, and more particularly to a human body detecting apparatus and a human body for detecting a human body from objects having the same brightness and different emissivities. Regarding detection method.

[0002]

2. Description of the Related Art Conventionally, in a human body detecting apparatus and a human body detecting method for detecting a human body using infrared rays, generally, an infrared camera is used to image the luminance (intensity of infrared rays) of the object, and the human body is detected from the luminance of the imaged object. When an object having the same brightness as is extracted, the corresponding object is detected as a human body.

[0003]

However, according to the conventional human body detection device and human body detection method described above, the human body is detected only based on the brightness of the object imaged by the infrared camera, so that the emissivity is low and the temperature is high. When the brightness obtained by imaging the infrared rays emitted from the object of 1 and the brightness obtained by imaging the infrared rays emitted from the object of high emissivity and low temperature are the same, There is a problem that a high-temperature object (that is, background) and a high-emissivity and low-temperature object (that is, human body) cannot be distinguished, and the background is detected as a human body, resulting in erroneous detection.

Therefore, when the above-mentioned conventional technique is applied to a crime prevention system, there is a disadvantage that the crime prevention system is activated each time an erroneous detection occurs. Further, when the above-mentioned conventional technique is applied to a pedestrian detection system for a vehicle, there is a disadvantage that an erroneous detection prompts the driver to pay unnecessary attention.

The present invention has been made in view of the above, and it is an object of the present invention to improve the detection accuracy of a human body by surely distinguishing an object having a low emissivity and a high temperature from an object having a high emissivity and a low temperature. And

[0006]

In order to achieve the above object, the human body detecting apparatus according to claim 1 is an infrared imaging means for imaging infrared rays emitted from an object as shown in the claim correspondence diagram of FIG. Infrared imaging in two states, that is, a state in which infrared rays are emitted from the infrared emission means CL2 and a state in which infrared rays are not emitted, by controlling CL1, infrared emission means CL2 for emitting infrared rays, infrared imaging means CL1 and infrared emission means CL2. The extraction / control means CL3 and the extraction / control means CL3 for inputting the infrared information picked up by the means CL1 and respectively extracting the infrared information of a predetermined temperature zone.
The human body detection means CL4 for detecting a human body from an object based on the extraction results in the two states extracted in Step 2.

According to a second aspect of the present invention, in the human body detecting device according to the first aspect, the extraction / control means CL3 extracts an image of an object having the same brightness as the human body from the infrared information imaged by the infrared imaging means CL1. The human body detecting means CL4 inputs the image of the object having the same brightness as the human body extracted by the extracting / controlling means CL3, and detects the human body from the object based on the difference between the images in the two states.

A human body detecting method according to a third aspect of the present invention is based on a step of creating first image information based on infrared rays radiated by the object itself and an infrared ray reflected from the object when the object is irradiated with the infrared rays. Creating second image information, detecting a difference in emissivity of the object from the first image information and the second image information, and detecting a human body based on the detected difference in emissivity And a step of performing.

[0009]

In the human body detecting apparatus (Claim 1) of the present invention, the extraction / control means CL3 controls the infrared imaging means CL1 and the infrared emitting means CL2 to emit infrared rays from the infrared emitting means CL2 and the infrared rays. The infrared information captured by the infrared imaging means CL1 in the two states of not radiating is input, and the infrared information of each predetermined temperature zone is extracted. For example, when infrared rays are emitted from the infrared ray emitting means CL2, the infrared rays emitted from the infrared ray emitting means CL2 are reflected by an object, and the reflected infrared rays and the infrared rays emitted by the object itself are superposed and imaged by the infrared image pickup means CL1. To be done. On the other hand, the infrared radiation means CL2
In the state that does not emit infrared rays, only the infrared rays emitted by the object are imaged by the infrared imaging means CL1. The human body detecting means CL4 detects the human body from the object based on the extraction results in the two states extracted by the extracting / controlling means CL3. This allows low emissivity and high temperature objects (background)
And a high-emissivity and low-temperature object (human body) can be reliably distinguished.

Further, in the human body detecting apparatus according to the present invention (claim 2), the extraction / control means CL3 is the infrared imaging means CL.
An image of an object having the same brightness as the human body is extracted from the infrared information captured in 1, and the human body detection means CL4 inputs the image of the object having the same brightness as the human body extracted by the extraction / control means CL3, and two states are obtained. By detecting the human body from the object based on the difference between the images in, the object with low emissivity and high temperature (background) and the object with high emissivity and low temperature (human body) can be reliably distinguished.

Further, according to the human body detecting method (claim 3) of the present invention, the first image information is created based on the infrared rays radiated by the object itself, and the reflected infrared rays from the object when the object is irradiated with the infrared rays are generated. Creating second image information based on the first image information and detecting the difference in emissivity of the object from the first image information and the second image information, and detecting the human body based on the detected difference in emissivity, A low emissivity and high temperature object (background) and a high emissivity and low temperature object (human body) are reliably distinguished.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A human body detecting apparatus and a human body detecting method according to the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a block diagram showing the human body detecting apparatus of this embodiment. An infrared camera 201 as an infrared image pickup means for picking up an infrared ray emitted from an object, an infrared radiator 202 as an infrared ray emitting means for emitting an infrared ray, and an image having the same brightness as a human body are extracted from the infrared rays picked up by the infrared camera 201. And an image processing device 203 for detecting a human body.

Further, the image processing device 203 receives the infrared information from the infrared camera 201 so that the infrared information is input through the infrared camera 201 in two states, that is, the state where the infrared radiator 202 emits infrared rays and the state where the infrared rays are not emitted. And a control unit 204 for controlling the infrared radiator 202, and an extraction unit 205 for inputting infrared information captured by the infrared camera 201 and extracting infrared information of an image having the same brightness as a human body (that is, an image of a human body temperature zone). And a difference calculation unit 206 that calculates the difference between the extraction results in the two states extracted by the extraction unit 205, and a human body detection unit 207 that detects from the object based on the difference calculated by the difference calculation unit 206. .

The control unit 204 and the extraction unit 205 constitute extraction / control means, and the difference calculation unit 206 and the human body detection unit 207 constitute human body detection means.

As the infrared radiator 202, for example, a simple construction of a copper plate coated with matte black, and a substance having a high emissivity and a high temperature can be used. There is no need to use special equipment. Specifically, when this human body detection device is mounted on a vehicle, for example, a part of an engine block or the like is painted with matte black, and is used as an infrared radiator 202 when the engine is operated and the temperature becomes high. It is also possible.

Further, in the figure, reference numeral 208 denotes a pseudo human body sample made of a copper plate having a high emissivity and low temperature like a human body, and 209 denotes a comparative sample made of aluminum which is a substance having a low emissivity and a high temperature. Here, it is assumed that the surface of the comparative sample 209 is adjusted in advance by polishing the surface so that it has the same brightness as the pseudo human body sample 208.

Next, the principle of the present invention will be described with reference to FIGS. In the following, the first image is an image in which only infrared rays radiated by the object itself are imaged to extract infrared information having the same brightness as that of the human body, and the second image is an object irradiated with infrared rays. The image which picked up the infrared rays in which the infrared rays reflected from the object at the time and the infrared rays emitted by the object itself were imaged to extract the infrared information is shown. That is, the first image is an image in which infrared information is extracted without operating the infrared radiator 202 in the human body detecting device of the present embodiment, and the second image is in the human body detecting device of the present embodiment. It is an image in which infrared information is extracted by operating the infrared radiator 202.

Incidentally, FIGS. 3A and 3B and FIG. 4A
(B) shows the following images, respectively. FIG. 3 (a) ... First image of pseudo human body sample 208 FIG. 3 (b) ... First image of comparative sample 209 FIG. 4 (a) ... Second image of pseudo human body sample 208 b) ... second image of comparative sample 209

The images of FIGS. 3 and 4 are created as follows. First, emissivity about 0.98, temperature about 32
The infrared camera 201 images infrared rays radiated from the simulated human body sample 208 itself at 0 ° C.
Acquire the first image of 8. Next, infrared rays emitted from the comparative sample 209 itself having an emissivity of about 0.05 and a temperature of about 80 ° C. are imaged by the infrared camera 201, and the comparative sample 209
Obtain a first image of.

Further, from the position 3 m away from the pseudo human body sample 208 imaged by the infrared camera 201, 200 ° C.
The infrared camera 201 picks up an image of the infrared rays emitted from the infrared radiator 202 which is heated to the infrared rays, and the infrared rays emitted from the infrared rays emitted from the pseudo human body sample 208 and the infrared rays emitted from the infrared rays are superposed on each other.
Obtain a second image of. Next, from the position 3 m away from the comparative sample 209 imaged by the infrared camera 201, 20
Infrared rays emitted from the infrared ray radiator 202 heated to 0 ° C. and reflected infrared rays when the comparative sample 209 was irradiated with the infrared rays and the infrared rays emitted from the infrared rays were superposed by the infrared camera 201, and the comparative sample 209 was imaged. Obtain a second image of.

First, comparing FIGS. 3A and 3B, although the emissivity of the pseudo human body sample 208 and the comparison sample 209 are greatly different, the images have substantially the same brightness. Therefore, the pseudo human body sample 208 and the comparative sample 209 cannot be distinguished simply by comparing FIG. 3A and FIG. 3B.

Here, as shown in FIG. 4A, the second image of the pseudo human body sample 208 obtained by using the infrared radiator 202 shows the pseudo human body sample 208 with respect to the infrared rays from the infrared radiator 202. Since the reflected light is low (the reflectance is low), the brightness of the image does not change.

On the other hand, as shown in FIG. 4B, the second image of the comparative sample 209 obtained by using the infrared radiator 202 shows that the comparative sample 209 shows the reflected light of the infrared radiation from the infrared radiator 202. Since there are many (high reflectance),
The brightness of the image is higher than that in FIG.

Therefore, the comparison sample 209 has a difference in brightness between the first image and the second image.
It is possible to specify that the pseudo human body sample 208 has a small brightness difference and substantially the same brightness.

That is, according to the present invention, by obtaining the brightness difference (that is, the difference in emissivity) between the first image and the second image, it is possible to obtain the same high emissivity as the human body based on the brightness difference. The object for low temperature (pseudo human body sample 208) and the object for low emissivity and high temperature (comparative sample 209) are reliably distinguished.

The operation of the above structure and principle will be described with reference to FIG. FIG. 5 is a flowchart showing the operation of the human body detection apparatus according to this embodiment. First, the infrared radiator 202 is turned off under the control of the control unit 204 (S501), and an image is taken by the infrared camera 201 (S50).
2) The extraction unit 205 inputs the infrared information captured by the infrared camera 201 and extracts the infrared information of the image having the same brightness as the human body (S503). Next, the extracted infrared information is stored as a first image in a predetermined memory (not shown) in the difference calculation unit 206 (S504).

Then, the infrared radiator 202 is turned on (S
505), in a state where infrared rays are emitted from the infrared radiator 202, the infrared camera 201 takes an image (S506), and the extraction unit 205 inputs the infrared information taken by the infrared camera 201 to obtain an image having the same brightness as the human body. Infrared information is extracted (S507). Next, the extracted infrared information is sent to the difference calculation unit 206 as a second image, and the brightness difference from the first image stored in the memory is obtained (S508). Finally, the human body detection unit 207 determines that there is a low emissivity and high temperature object (that is, not a human body) based on the luminance difference calculated by the difference calculation unit 206, and the luminance difference is When there are few and substantially the same brightness, the human body is detected by determining that it is a high emissivity and low temperature object (that is, human body) (S509).

As described above, according to the present embodiment, the infrared camera 20 in the two states, that is, the state where the infrared radiator 202 emits infrared rays and the state where the infrared radiators do not emit infrared rays.
Since the infrared information imaged in 1 is input, and an object having a low emissivity and a high temperature and an object having a high emissivity and a low temperature can be reliably distinguished based on the brightness difference between them, the detection accuracy of the human body can be improved. it can.

[0030]

As described above, in the human body detecting apparatus (Claim 1) of the present invention, the extraction / control means controls the infrared imaging means and the infrared emitting means to emit infrared rays from the infrared emitting means. The infrared information captured by the infrared imaging means in the two states, that is, the state and the state in which the infrared ray is not emitted, is input, and the infrared information in the predetermined temperature range is extracted, and the human body detection means is based on the extraction result in the two states. Since the human body is detected from within the object, it is possible to reliably distinguish the low emissivity and high temperature object (background) from the high emissivity and low temperature object (human body), and to improve the human body detection accuracy. .

Further, in the human body detecting device of the present invention (claim 2), the extraction / control means extracts the image of the object having the same brightness as the human body from the infrared information imaged by the infrared imaging means, and the human body detection means , An image of an object having the same brightness as the human body extracted by the extraction / control means is input, and the human body is detected from the object based on the difference between the images in the two states. ) And a high-emissivity and low-temperature object (human body) can be reliably distinguished, and human body detection accuracy can be improved.

Further, according to the human body detecting method (claim 3) of the present invention, the first image information is created based on the infrared rays radiated by the object itself, and the reflected infrared rays from the object when the object is irradiated with the infrared rays are generated. The second image information is created based on the first image information and the second image information, the difference in emissivity of the object is detected, and the human body is detected based on the detected emissivity difference. An object with high emissivity and high temperature (background) and an object with high emissivity and low temperature (human body) can be reliably distinguished, and the accuracy of human body detection can be improved.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a complaint.

FIG. 2 is a configuration diagram showing a human body detection device of the present embodiment.

FIG. 3 is an explanatory diagram showing the principle of the present invention.

FIG. 4 is an explanatory diagram showing the principle of the present invention.

FIG. 5 is a flowchart showing an operation of the human body detection device according to the present embodiment.

[Explanation of symbols]

CL1 infrared imaging means CL2 infrared radiation means CL3 extraction / control means CL4 human body detection means 201 infrared camera 202 infrared radiator 203 image processing device 204 control section 205 extraction section 206 difference calculation section 207 human body detection section 208 pseudo human body sample 209 comparison sample

Claims (3)

[Claims] 1. An infrared image pickup means for picking up infrared rays emitted from an object, an infrared ray emitting means for emitting infrared rays, and a state in which infrared rays are emitted from the infrared ray emitting means by controlling the infrared image pickup means and the infrared ray emitting means. And the extraction / control means for inputting the infrared information imaged by the infrared imaging means in the two states of not emitting infrared rays and extracting the infrared information in a predetermined temperature zone respectively, and the extraction / control means for extracting the infrared information. A human body detecting device comprising: a human body detecting means for detecting a human body from an object based on extraction results in two states. 2. The extracting / controlling means extracts an image of an object having the same brightness as the human body from the infrared information captured by the infrared imaging means, and the human body detecting means extracts the human body extracted by the extracting / controlling means. Input an image of an object having the same brightness as, and based on the difference between the images in the two states,
The human body detecting apparatus according to claim 1, wherein the human body is detected from the object. 3. A step of creating first image information based on infrared rays emitted by the object itself, and a step of creating second image information based on infrared rays reflected from the object when the object is irradiated with infrared rays. And a step of detecting a difference in emissivity of the object from the first image information and the second image information, and a step of detecting a human body based on the detected difference in emissivity. Human body detection method.