KR100777428B1 - Image processing device and method - Google Patents

Image processing device and method Download PDF

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Publication number
KR100777428B1
KR100777428B1 KR1020050067883A KR20050067883A KR100777428B1 KR 100777428 B1 KR100777428 B1 KR 100777428B1 KR 1020050067883 A KR1020050067883 A KR 1020050067883A KR 20050067883 A KR20050067883 A KR 20050067883A KR 100777428 B1 KR100777428 B1 KR 100777428B1
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KR
South Korea
Prior art keywords
image
subject
visible light
camera
light
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KR1020050067883A
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Korean (ko)
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KR20070013512A (en
Inventor
김학노
류재삼
이창희
조상진
최병훈
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한국원자력연구원
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/262Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/2621Cameras specially adapted for the electronic generation of special effects during image pickup, e.g. digital cameras, camcorders, video cameras having integrated special effects capability
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/10Segmentation; Edge detection
    • G06T7/13Edge detection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/2251Constructional details
    • H04N5/2254Mounting of optical parts, e.g. lenses, shutters, filters or optical parts peculiar to the presence or use of an electronic image sensor
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/235Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor
    • H04N5/238Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor by influencing the optical part of the camera, e.g. diaphragm, intensifier, fibre bundle
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/10Image acquisition modality
    • G06T2207/10024Color image

Abstract

The present invention relates to an image processing apparatus and method capable of clearly detecting a shape and heat generation distribution of a subject by processing an image of a subject acquired simultaneously by an infrared camera and a visible light camera.
According to the present invention, the optical paths from the subject to the visible light camera and the infrared camera are matched with each other to capture the same surface of the subject, and the edge image of the edge with respect to the subject through edge detection from the image by the visible light camera. After detecting, the contour image of the edge and the image by the infrared camera are simultaneously displayed on the screen, so that the shape and thermal distribution state of the subject can be clearly measured.
Visible light camera, infrared camera, image, subject, edge detection, contour

Description

Image processing apparatus and method {IMAGE PROCESSING DEVICE AND METHOD}

1 is a schematic configuration diagram of an image processing apparatus according to an embodiment of the present invention.

2 is an exemplary view of an image by a visible light camera and an infrared camera according to an embodiment of the present invention.

3 is an exemplary view of a contour image according to an embodiment of the present invention.

4 is an exemplary view of a final screen of a subject according to an embodiment of the present invention.

 Explanation of symbols on the main parts of the drawings

10: subject 20: transmissive / reflective plate

30: visible light camera 40: infrared camera

50: contour detection unit 51: edge detection unit

52: binarization unit 60: display unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to image processing, and more particularly, to an image processing apparatus and method capable of clearly detecting a shape and a heat generation distribution of a subject by processing an image of a subject acquired simultaneously by an infrared camera and a visible light camera. .

Infrared cameras are widely used in medicine, industry, and the like as devices for displaying radiant heat according to heat generated by a subject using an internal heat sensor and displaying a heat distribution state as an image. In addition, the visible light camera is a device that displays the luminance distribution of the subject as an image using a lens, and is used to monitor an object in the visible light region such as a human eye.

Conventional infrared cameras can show the thermal distribution of the object well, but the shape of the measured object is not clear, and the visible light camera can clearly show the shape of the object, but not the thermal distribution of the object.

As described above, techniques for displaying an image of an object by using the advantages and disadvantages of the visible light camera and the infrared camera as appropriate and clearly indicating the thermal distribution state of the object have been proposed.

In fact, recently, in the case of expensive products, techniques for displaying an object's shape and thermal distribution state by using an infrared camera and a general visible light camera at the same time have been proposed. For example, a technique of grasping a thermal state of an object using an infrared camera and then capturing a shape of an object corresponding thereto using a general visible ray camera and displaying the location thereof is attempted.

However, in the prior art, when the shape of the object and the thermal distribution state are displayed on the screen by using an infrared camera and a general visible light camera, the shape of the measured object is not clear and requires processing of a PCB or a micro part. Accurate measurements were difficult with medical measurements. In particular, the infrared camera uses a method of measuring the infrared rays generated by the heat of the object. Therefore, when several small objects such as chips or elements of the PCB are arranged, it is difficult to distinguish the objects when there is no difference from the surroundings. There is a problem that the image is not clear.

Accordingly, there is a need in the art for an image processing technology capable of accurately measuring the shape of an object using an infrared camera and a visible light camera, and at the same time accurately displaying the thermal distribution of the object.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-described problems, and simultaneously matches the optical paths of a visible light camera and an infrared camera for a subject, and simultaneously captures the same surface of the subject, and displays an image of the subject from an image by the visible light camera. It is an object of the present invention to provide an image processing apparatus and method capable of accurately detecting a thermal distribution of the subject to a minute portion by outputting an outline image of an edge and simultaneously displaying the outline image and an image by the infrared camera on a screen. .

The image processing apparatus of the present invention for achieving the above object is a transmission / reflector for transmitting light in the infrared region and reflecting light in the visible region of the light from the subject; A visible light camera that receives light in a visible light region reflected from the transmission / reflector to obtain a first image according to a luminance distribution of the subject; An infrared camera that receives light in an infrared region passing through the transmission / reflector to obtain a second image according to a heat distribution of the subject; An outline detection unit for detecting an outline image of an edge of the subject through edge detection from the first image; And a display unit for simultaneously displaying a contour image of the subject and the second image on a screen, wherein the optical paths from the subject to the transmission / reflector of the respective optical paths of the visible light camera and the infrared camera coincide with each other and are visible. Each optical path length from each of the camera and the infrared camera to the subject is the same, and the first and second images are images on the same plane as the subject.

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In one embodiment of the present invention, the contour detection unit comprises: an edge detection unit detecting an edge from the first image; And a binarization unit configured to give a specific color value to pixels of the first image corresponding to the edge and to give a color value of 0 to the remaining pixels, thereby performing binarization for each pixel of the first image.

In one embodiment of the present invention, the transmission / reflector may be a mirror coated with a thin film comprising TiO 2 and SiO 2 .

In addition, the image processing method of the present invention for achieving the above object is a method of processing an image of a subject using a visible light camera and an infrared camera,
A first image matching the optical paths of the visible light camera and the infrared camera for the subject and capturing a first image according to the luminance distribution of the subject from the light in the visible light area among the light proceeding from the subject using the visible light camera step; A second step of capturing a second image according to the thermal distribution of the subject from the light in the infrared region among the light proceeding from the subject by using the infrared camera, and capturing the same surface as the imaging surface of the first image of the subject; A third step of detecting a contour image of an edge of the subject through edge detection from the first image; And a fourth step of simultaneously displaying the contour image of the edge of the subject and the second image on the screen, wherein the optical path lengths from each of the visible ray camera and the infrared camera to the subject are the same and The first image and the second image are images of the same surface of the subject.

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Further, in one embodiment of the present invention, the third step includes detecting an edge from an image by the visible light camera; And assigning a specific color value to pixels of the image corresponding to the edge and assigning a color value to 0 to the remaining pixels to perform binarization for each pixel of the image.

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Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. It is to be noted that the same reference numerals and the same elements among the drawings are indicated by the same reference numerals and symbols as much as possible even if displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a schematic configuration diagram of an image processing apparatus according to an embodiment of the present invention. As illustrated in FIG. 1, the image processing apparatus of the present invention transmits light 22 in the infrared region and reflects light 21 in the visible region among the light 11 traveling from the subject 10. A visible light camera 30 that receives the light 21 in the visible light region reflected from the / reflective plate 20 and the transmissive / reflective plate 20 to obtain a first image according to the luminance distribution of the subject 10; An infrared camera 40 which receives the light 22 in the infrared region passing through the transmission / reflector 20 to obtain a second image according to the heat distribution of the subject 10, and edge detection from the first image. and an edge detection unit 50 for detecting a contour image of the subject 10 through an edge detection, and a display unit 60 for simultaneously displaying the contour image and the second image of the subject 10 on the screen. .

Here, the contour detection unit 50 gives a specific color value to the edge detection unit 51 that detects an edge from the first image and a pixel of the first image corresponding to the edge, and gives a color value of 0 to the remaining pixels. And a binarization unit 52 for performing pixel-by-pixel binarization of the first image. As an example, the binarization unit 52 provides a color value of, for example, black to a pixel corresponding to an edge, and a color value of white to other pixels so that the edge part is clearly revealed.

The visible light camera 30 and the infrared camera 40 may use a known camera. For example, the visible light camera 30 may use a known CCD camera, and the infrared camera 40 may use a known infrared thermal camera. Such a CCD camera is composed of a lens and a CCD sensor constituting an image sensor that is exposed to the visible light region (about 400 ~ 700nm). The CCD sensor generates and outputs a digital signal by photoelectric conversion of the optical image input from the lens. In addition, the infrared thermal imaging camera is composed of a lens and an infrared sensor constituting an image sensor that is exposed to the far infrared region (about 8 ~ 9㎛). The infrared sensor generates and outputs a digital signal by photoelectric conversion of the optical image input from the lens.

The transmission / reflection plate 20 transmits light in the infrared region and reflects light in the visible region. The transmission / reflection plate 20 may use a predetermined mirror. Particularly preferably, the transmission / reflection plate 20 is coated with a thin film of TiO 2 and SiO 2 on the surface. As shown in FIG. 1, the visible light camera 30 and the infrared camera 40 capture the same surface of the subject 10 by appropriately disposing the transmission / reflection plate 20.

The visible light camera 30 acquires an image of the subject 10 reflected by the transmission / reflection plate 20. In this case, the image by the visible light camera 30 represents a shape according to the luminance distribution of the subject 10. In addition, the infrared camera acquires an image of the subject 10 through the transmission / reflection plate 20. In this case, the image by the infrared camera 40 represents the thermal distribution of the subject 10.

2 shows an image by a visible light camera and an infrared camera according to an embodiment of the present invention, respectively. Referring to the example of FIG. 2, the first image 31 of the visible light camera 30 according to the present invention represents the shape of the subject 10 as it is. In addition, the second image 41 by the infrared camera 40 shows the heat distribution of the subject 10. That is, the first image 31 has color values for each pixel according to the luminance distribution of the subject 10, and the second image 41 for each pixel according to the temperature distribution in the subject 10. It has a color value. In particular, the second image 41 is an infrared camera 40 photographing infrared rays generated by the heat generated by the subject 10, and has different color values for different pixels according to temperature.

3 is an exemplary view of a contour image according to an embodiment of the present invention.

As shown in FIG. 3, the contour detector 50 detects the contour image of the subject 10 through edge detection from the first image 31 acquired by the visible light camera 30. . The contour detecting unit 50 includes an edge detecting unit 51 and a binarization unit 52. The edge detector 51 detects an edge from the first image 31 through edge detection. The edge corresponds to the outline of the object in the image and is a boundary at which the color value of the pixel changes abruptly. This edge is detected by finding a color value where the boundary of the object is significantly different from the surroundings. The binarization unit 52 assigns a specific color value (for example, 30 out of 1 to 255) to a pixel of the first image 31 corresponding to the detected edge and gives a color value of 0 to the remaining pixels. Pixel-wise binarization of the first image 31 is performed. In this way, only the outline image 53 corresponding to the edge of the subject can be extracted by applying a constant color value to only the pixels corresponding to the edges and setting the color values to all of the remaining zeros.

4 is an exemplary view of a final screen of a subject according to an embodiment of the present invention.

As shown in FIG. 4, the contour image 53 detected from the first image 31 acquired by the visible light camera 30 and the second image 41 acquired by the infrared camera 40 are simultaneously displayed. By displaying on a predetermined screen, not only the shape of the subject 10 can be accurately displayed, but also the thermal distribution state of the subject 10 can be clearly displayed. Preferably, the first image 31 obtained by the visible light, the contour image 53 and the second image 41 obtained by the infrared camera have the same size and number of pixels. More preferably, the three images 31, 53, and 41 have 640 x 480 pixels. However, this is only an example and may have different size and number of pixels, and in this case, the same size and number may be adjusted and displayed on one screen.

Even when there are a plurality of subjects 10, the contour image and the infrared image of each subject 10 can be displayed at the same time to clearly display on which screen the subject 10 generates a lot of heat.

Hereinafter, the image processing method according to the present invention will be described.

First, as shown in FIG. 1, a transmissive / reflective plate 20 which transmits light in the infrared region and reflects light in the visible region among the lights 11 traveling from the subject 10 is provided, and further, a visible ray camera. 30 and an infrared camera 40 are provided.

The transmission / reflector 20 is maintained at a constant distance and angle with respect to the subject 10, and the infrared camera 40 is photographed by the infrared camera 40 through the transmission / reflector 20. In this case, the image of the subject 10 captured by the infrared camera 40 represents a thermal distribution state of the subject 10. In addition, the subject 10 is captured by receiving light in the visible light region reflected by the transmission / reflector 20 using the visible light camera 30. At this time, the image of the subject 10 captured by the visible light camera 30 represents the luminance distribution of the subject 10. Here, preferably, the visible light camera 30 and the infrared camera 40 capture the same surface of the subject 10.

Subsequently, the contour image of the subject is detected from the image of the subject acquired by the visible light camera 30 through edge detection, and the contour image of the subject and the image of the subject by the infrared camera are screened. At the same time. Thus, the thermal distribution of the subject is clearly displayed together with the clear shape of the subject on one screen.

The detailed description and contents of the drawings described above are limited to the preferred embodiments of the present invention, and the present invention is not limited thereto. It will be possible to substitute, change or delete the component according to the present invention within the scope of the technical idea of the present invention.

Accordingly, the scope of the present invention should be determined by the appended claims rather than by the foregoing description and drawings.

According to the present invention, a contour image is detected from an image by a visible light camera to clearly extract the shape of a subject, and the image is displayed on the screen simultaneously with the image by the infrared camera, thereby simultaneously displaying the shape of the subject and the thermal distribution of the subject. It can be measured clearly.

Claims (12)

  1. A transmissive / reflective plate which transmits light in the infrared region and reflects light in the visible region among the light traveling from the subject;
    A visible light camera that receives light in a visible light region reflected from the transmission / reflector to obtain a first image according to a luminance distribution of the subject;
    An infrared camera that receives light in an infrared region passing through the transmission / reflector to obtain a second image according to a heat distribution of the subject;
    An outline detection unit for detecting an outline image of an edge of the subject through edge detection from the first image; And
    A display unit for simultaneously displaying a contour image of the subject and the second image on a screen; Including,
    The optical paths from the subject to the transmission / reflector of the optical paths of the visible light camera and the infrared camera correspond to each other, and each optical path length from each of the visible light camera and the infrared camera to the subject is the same and the first image And the second image is an image on the same plane as the subject.
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  4. The method of claim 1, wherein the contour detection unit,
    An edge detector detecting an edge from the first image;
    A binarization unit for performing pixel-specific binarization of the first image by assigning a specific color value to pixels of the first image corresponding to the edges and a color value of 0 to the remaining pixels; An image processing apparatus comprising a.
  5. The method of claim 1,
    The transmission / reflection plate is an image processing apparatus, characterized in that the mirror coated with a thin film containing TiO 2 and SiO 2 .
  6. In the method of processing the image of the subject using a visible light camera and an infrared camera,
    A first image matching the optical paths of the visible light camera and the infrared camera for the subject and capturing a first image according to the luminance distribution of the subject from the light in the visible light area among the light proceeding from the subject using the visible light camera step;
    A second step of capturing a second image according to the thermal distribution of the subject from the light in the infrared region among the light proceeding from the subject by using the infrared camera, and capturing the same surface as the imaging surface of the first image of the subject;
    A third step of detecting a contour image of an edge of the subject through edge detection from the first image; And
    A fourth step of simultaneously displaying a contour image of the edge of the subject and the second image on a screen; Including,
    And each optical path length from each of the visible light camera and the infrared camera to the subject is equal to each other, and the first image and the second image are images of the same surface of the subject.
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  9. The method of claim 6, wherein the third step,
    Detecting an edge from an image by the visible light camera; And
    And assigning a specific color value to pixels of the image corresponding to the edges and assigning a color value of 0 to the remaining pixels to perform binarization for each pixel of the image.
  10. The method of claim 6,
    The light in the visible light region is the light in the visible light region reflected by the transmission / reflector among the light traveling from the subject,
    The light in the infrared region is the light in the infrared region transmitted by the transmission / reflector among the light proceeding from the subject,
    The transmission / reflection plate is an image processing method, characterized in that the mirror coated with a thin film containing TiO 2 and SiO 2 .
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  12. delete
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