WO2014003433A1 - 입체 열화상을 이용한 차량 내 온도계측 장치 - Google Patents
입체 열화상을 이용한 차량 내 온도계측 장치 Download PDFInfo
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- WO2014003433A1 WO2014003433A1 PCT/KR2013/005646 KR2013005646W WO2014003433A1 WO 2014003433 A1 WO2014003433 A1 WO 2014003433A1 KR 2013005646 W KR2013005646 W KR 2013005646W WO 2014003433 A1 WO2014003433 A1 WO 2014003433A1
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- thermal image
- vehicle
- temperature
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- side device
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- 238000001931 thermography Methods 0.000 title claims abstract 3
- 238000000034 method Methods 0.000 claims description 33
- 238000009529 body temperature measurement Methods 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000013507 mapping Methods 0.000 claims description 4
- 206010047571 Visual impairment Diseases 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims description 2
- 230000006866 deterioration Effects 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 4
- 238000009877 rendering Methods 0.000 abstract 1
- 238000004378 air conditioning Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000036760 body temperature Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003702 image correction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
- G01J5/0025—Living bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
- G01J5/041—Mountings in enclosures or in a particular environment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/07—Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0806—Focusing or collimating elements, e.g. lenses or concave mirrors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/204—Image signal generators using stereoscopic image cameras
- H04N13/239—Image signal generators using stereoscopic image cameras using two 2D image sensors having a relative position equal to or related to the interocular distance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/271—Image signal generators wherein the generated image signals comprise depth maps or disparity maps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/20—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only
- H04N23/23—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only from thermal infrared radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
Definitions
- the present invention relates to an apparatus for measuring the temperature of a vehicle interior using an infrared sensor, and more particularly, to a vehicle interior including a passenger by a pair of left and right stereo infrared sensors arranged at a predetermined distance in front of the vehicle interior.
- the present invention relates to an in-vehicle thermometer-side device using a three-dimensional thermal image for measuring temperature in the form of a three-dimensional thermal image.
- the air conditioner In order to optimize the air conditioning of the vehicle's interior space, in particular, the air conditioner must first measure the temperature of the interior space accurately.
- the most widely used method for this is the non-contact thermometer measurement method using an infrared sensor. According to this method, the temperature of the face of the occupant is non-contacted by an infrared sensor installed in the vehicle interior, and the air conditioning, in particular, the cooling state of the vehicle interior can be controlled according to the measurement result.
- An example of an automotive air conditioner using the non-contact thermometer measuring method using the infrared sensor may be an automobile air conditioner illustrated in FIG. 1.
- the vehicle air conditioner includes a front sensor 105 on a dashboard 103 positioned in front of an interior space, and a rear sensor 109 on a rear surface of a front seat back 107. ) Are mounted obliquely backwards, respectively, so that the temperature of the face region of the occupant such as the driver is directly measured as shown by the arrows by these front and rear infrared sensors 105 and 107.
- the infrared sensor 203 to measure the whole body temperature of the rear occupant, for example, room lamp It is placed in the upper front position such as the unit, and the whole passenger occupants in the rear left and right seats 207 and 208 of the rear seat, and the front front left and right seats 203 and 204, even by one infrared sensor 203 having a narrow angle of view lens. It is possible to measure the temperature of the part of the occupant's face on the board.
- the conventional infrared sensor 203 disposed as described above has a narrow viewing angle as shown by the solid line in FIG. 2, the wide viewing angle represented by the hidden line of FIG. 2 measured by the sensor having the wide-angle lens cannot be secured.
- an expensive wide-angle lens sensor has to be employed or the number of use of the sensor must be increased, thereby increasing manufacturing costs such as equipment cost.
- the present invention has been proposed to solve the problems of the conventional infrared sensor structure for a vehicle interior thermometer as described above, while a pair of stereo infrared sensors are arranged in the vehicle interior at an appropriate interval, and each infrared sensor To improve the accuracy of temperature measurement in the vehicle for refrigeration and air conditioning by three-dimensionally measuring each 2D thermal image of the vehicle interior measured by the 3D thermal image to accurately measure the temperature distribution of the vehicle interior. Its purpose is to.
- the present invention is a pair of stereo infrared sensor and a pair of stereo infrared sensor which is disposed so as to be spaced apart from each other on the front side of the interior of the vehicle to measure the thermal image for the interior of the vehicle, and the pair of stereo infrared sensor And a control unit for stereoscopically converting the 2D thermal image measured by the 3D thermal image into a 3D thermal image, and a controller for correcting the 3D thermal image information stereoscopically processed by the calculating unit according to a parameter value affecting the temperature of the vehicle interior.
- an in-vehicle thermometer side apparatus using a three-dimensional thermal image.
- the pair of stereo infrared sensors are preferably arranged to measure the temperature of any one of the front seats and two rear seats of the vehicle seat.
- the stereo infrared sensor is preferably disposed adjacent to the rear of the vehicle rearview mirror.
- the stereo infrared sensor is preferably an infrared lens is a narrow angle lens.
- the stereo infrared sensor is preferably an angle of view of 55 ° to 75 ° of the infrared lens.
- the stereo infrared sensor is preferably disposed at the left and right ends of the room mirror of the vehicle.
- the pair of stereo infrared sensors are preferably arranged to measure the temperature of any one of the two rear seats and two front seats of the vehicle seat.
- the stereo infrared sensor is preferably disposed on each of the left and right A-pillars of the vehicle.
- the stereo infrared sensor is preferably an infrared lens is a narrow angle lens.
- the stereo infrared sensor is preferably an angle of view of 55 ° to 75 ° of the infrared lens.
- the stereo infrared sensor is preferably disposed at the lower end of the left and right A-pillar of the vehicle, respectively.
- the control unit may include a sensor correction step of calibrating a stereo infrared sensor disposed in a vehicle interior to correct distortion of the thermal image, and a thermal image measuring the thermal image of the interior of the vehicle by the sensor calibrated in the sensor correction step.
- a stereo matching step of obtaining coordinate shifts between the corresponding points of each thermal image by comparing each of the thermal images measured in the measurement step and the thermal image measuring step, and mapping and mapping the coordinate shifts obtained in the stereo matching step. It is preferable to correct the temperature information on the 3D thermal image stereoscopicized by the calculating unit through the stereoscopic thermal image forming step to be obtained.
- the control unit may further correct the temperature information of the 3D thermal image three-dimensionalized by the calculating unit through a temperature filtering step of removing thermal afterimages, shaking, and noise from the thermal image measured in the thermal image measurement step. .
- the controller may further include a stereoscopic 3D image generated by the operation unit through a thermal image calibration step of digitizing a thermal image measured in the thermal image measurement step according to a calibration characteristic value of the sensor obtained in the sensor correction step. It is desirable to correct the temperature information for the thermal image.
- the controller may be further configured to measure the temperature measured with respect to the specific coordinates when it is determined that the distance from the pair of stereo infrared sensors measuring the thermal image of the vehicle interior to a specific coordinate of the vehicle interior is greater than or equal to a certain distance. It is desirable to make a correction that compensates the measured value to a higher temperature value.
- the control unit may further compare the temperature measurement values measured by each of the pair of stereo infrared sensors with respect to specific coordinates of the vehicle interior, and when the compared temperature difference is greater than or equal to the tolerance Ttol, the pair of stereo infrared rays. It is desirable to determine that a failure has occurred in the sensor.
- the control unit reports the specific coordinate error point of the vehicle interior, counts the occurrence frequency of the error point, and counts the occurrence frequency of the counted error point.
- the temperature is 50% or more, the temperature measurement values by the pair of stereo infrared sensors are collectively offset, and when the frequency of occurrence of the error point is less than 50%, the temperature difference outside the allowable value Ttol is generated. It is preferable to correct the temperature value of the corresponding pixel of the thermal image.
- the control unit uses an infrared ray in which the error occurs among the pair of stereo infrared sensors by using a temperature measurement value prepared for a separate member located in the vehicle interior. It is desirable to detect the sensor and correct the temperature value of the thermal image measured by the faulty infrared sensor.
- the controller may be configured to compensate for the temperature value of the three-dimensional thermal image by considering the inherent emissivity provided for each member of the member or for each part of the human body, which is previously determined according to the coordinate information of the vehicle interior. It is desirable to correct the temperature information for the stereoscopic 3D thermal image.
- control unit in compensating the temperature value of the three-dimensional thermal image by the material of each member or the parts of the human body in advance according to the coordinate information of the interior of the vehicle, the weight of the radiation energy for each member or each part of the human body Compensate for the temperature value of the three-dimensional thermal image, the weight order is preferably applied in the order of the body, the ceiling of the vehicle, the door trim, clothing, the seat of the vehicle, the glass of the vehicle.
- FIG. 1 is a schematic side view of a vehicle for explaining a vehicle indoor temperature measuring method using a conventional infrared sensor.
- FIG. 2 is a partial plan view illustrating a vehicle interior temperature measurement method using another conventional infrared sensor.
- Figure 3 is a partially cutaway plan view of a vehicle showing an embodiment of the in-vehicle thermometer-side device using a three-dimensional thermal image according to the present invention.
- FIG. 4 is a side view of FIG. 3;
- FIG. 5 is a perspective view of FIG. 3.
- FIG. 6 is a plan view of FIG.
- Figure 7 is a partial perspective view of the vehicle interior showing another embodiment of the in-vehicle thermometer-side device using a three-dimensional thermal image according to the present invention.
- thermometer-side device 8 is a vehicle interior plan view of the thermometer-side device of FIG.
- thermometer measuring method by the in-vehicle thermometer measuring apparatus using a three-dimensional thermal image according to the present invention.
- FIG. 10 is a flowchart of the temperature measuring method shown in FIG. 9;
- 11 is a graph showing temperature sensing characteristics according to distance from a stereo infrared sensor for the same member in a vehicle interior.
- Thermometer side device as shown by the reference numeral 1 in Figure 3, a pair of left and right stereo infrared (IR) sensor (3, 4), the calculating unit 10, and the control unit 20 )
- the stereo infrared sensor (3, 4) is first arranged to be spaced apart from each other on the front side of the vehicle interior means for respectively measuring the 2D thermal image for forming a stereoscopic thermal image for the vehicle interior, If left and right symmetrical with respect to the center line, it is possible to arrange at various points on the front of the vehicle, as shown in Figures 3 to 5, the left and right A-pillar 11 of the vehicle to include as many vehicle occupants in the viewing angle as possible In 12) may be arranged towards the rear respectively.
- the stereo infrared sensor (3, 4) is that the support bracket 3 is disposed on the lower end of the left and right A-pillars (11, 12) of the vehicle. desirable.
- the stereo infrared sensors 3 and 4 measure a 2D, or two-dimensional, thermal image of the interior of the vehicle including the occupant.
- a narrow angle sensor in which the infrared lens is narrow.
- the angle of view of the infrared lens is advantageously 55 ° to 75 °, more preferably 60 ° to 70 °, more preferably 60 °. This is because the infrared sensors 3 and 4 have almost twice the measurement range according to the viewing angle compared to the infrared sensor using the wide angle lens having an angle of view of 75 ° to 100 °, but the distortion of the measured thermal images is relatively low.
- the angle of view narrows to 55 ° or less, even if the infrared sensors 3 and 4 are installed on the A-pillars 11 and 12 spaced apart from the rear seats at maximum in the vehicle interior, This is because the entire sheet cannot be included in the measurement range.
- the left sensor 3 is a visible area in a range including the front right seat 4, that is, the upper right corner of the front passenger seat, from the left end edge portion of the front and rear seats 5, 7 disposed on the left side of the vehicle interior. It is intended to measure the temperature for.
- the right sensor 4 includes the front left seat 3, that is, the upper left corner of the driver's seat, from the right end corner of the front and rear seats 6 and 8 disposed on the right side of the vehicle interior as opposed to the left sensor. The temperature of the visible region of the range is measured.
- each of the infrared sensors 3 and 4 has a conical shape in which the measurement range of the viewing angle is about 60 ° of the hypotenuse, so that the occupant of either of the rear seats left and right as shown in FIGS.
- the torso of the driver's front passenger and front passenger is measured. That is, the left infrared sensor 3 measures almost the entire body of the right occupant of the rear seat, but the left occupant barely covers the driver's seat, and on the contrary, the right infrared sensor 4 measures almost the whole body of the left occupant of the rear seat, Is occupied by the passenger seat, making it almost impossible to measure.
- each of the infrared sensors 3 and 4 intersects each other to any one of two rear seats 7 and 8 and two front seats 5 and 6 of the vehicle seat.
- the temperature of the occupant or the seat itself is measured, and a common area is formed for the front seats 5 and 6.
- the stereo infrared sensor (3, 4) is another arrangement form, as shown in Figs. 7 and 8, is disposed in the central portion of the front of the vehicle, the rearview mirror (15) of the rearview 15, or may be arranged side by side at a predetermined interval between the room lamp and the sunglass storage box although not shown. In addition, it may be disposed at the left and right ends of the room mirror 15 of the vehicle to maximize the left and right viewing angle.
- the left sensor 3 is the rear right seat 8 from the front left seat 5, that is, the left end corner of the driver's seat. Measures the temperature for the viewing area in the range including up to the right edge of the edge, and the right sensor 4 measures the front right seat 6, that is, the left end of the rear left seat 7 from the right edge of the passenger seat. The temperature is measured for the viewing area in the range including the edge.
- the stereo infrared sensors 3 and 4 disposed in the front center portion of the vehicle cabin measure the temperature of one front seat 5 or 6 and two rear seats 7 and 8 of the vehicle seat.
- common areas are formed in the rear sheets 7 and 8.
- the calculation unit 10 is a part which stereoscopically transforms the 2D thermal image measured by the stereo infrared sensors 3 and 4 into the 3D thermal image, and the two 2D thermal images measured by the sensors 3 and 4.
- the 3D coordinate matrix is obtained from the extracted 3D coordinates, and the 3D stereoscopic images are obtained from the respective 2D thermal images according to the stereo image splicing method. A detailed process will be described below.
- the control unit 20 is a part for controlling the overall air conditioning situation of the vehicle like a general air conditioning control unit, and receives a variety of variables such as, for example, wind speed, humidity, etc. that affects the temperature of the vehicle interior and exterior temperature as well as the operation unit
- the temperature information by the stereoscopic 3D thermal image is corrected at (10).
- the controller 20 A correction is made to compensate the measured temperature reading for a particular coordinate to a higher temperature value.
- the temperature compensation according to such a distance takes into account the temperature sensing characteristic according to the distance from the stereo infrared sensors 3 and 4 with respect to the same member of the vehicle interior as shown in FIG. 11. That is, the temperature of the thermal image of the same member in the vehicle interior decreases rapidly as the distance from the stereo infrared sensor 3, 4 increases, and the length of the thermal image of the same member of the vehicle interior is the stereo infrared sensor 3
- the temperature compensation reflects the characteristic that the gradual decreases as the distance from (4) increases. Meanwhile, in the graph shown in FIG.
- the horizontal axis is a distance (meter) from the stereo infrared sensors 3 and 4 with respect to the same member in the vehicle interior
- the left side of the vertical axis is a measurement temperature (° C) with respect to the same member in the vehicle interior.
- On the right of the vertical axis is the length of the thermal image (pixel) for the same member in the vehicle interior.
- the controller 20 repeatedly compares the temperature measurement values measured by each of the pair of stereo infrared sensors 3 and 4 with respect to specific coordinates of the vehicle interior, and the compared temperature difference is equal to or greater than the allowable value Ttol. In this case, it is determined that a failure has occurred in the pair of stereo infrared sensors 3 and 4.
- the control unit 20 reports a specific coordinate error point of the vehicle interior, counts the frequency of occurrence of the error point, and generates the counted error point.
- the frequency is 50% or more
- the temperature measurement values by the pair of stereo infrared sensors 3 and 4 are collectively offset, and when the frequency of occurrence of the error point is less than 50%, the temperature difference outside the tolerance Ttol is The temperature value of the corresponding pixel of the thermal image corresponding to the specific coordinates generated is corrected.
- control unit 20 may use the pair of stereo infrared sensors 3, by using a temperature measurement value prepared for a separate member located in the vehicle interior. 4) Infrared sensor 3 and 4 having an error are detected and the temperature value of the thermal image measured by the infrared sensor 3 and 4 having an error is corrected.
- the controller 20 compensates the temperature value of the stereoscopic thermal image by considering the inherent emissivity provided for each material of the member or for each part of the human body, which is previously determined according to the coordinate information of the vehicle interior, and the calculation unit
- the temperature information on the stereoscopic 3D thermal image is corrected by (10).
- the controller 20 compensates for the temperature value of the three-dimensional thermal image for each material of the member or the parts of the human body which are previously identified according to the coordinate information of the vehicle interior. Compensate the temperature value of the three-dimensional thermal image by placing an energy weight, and the order of the weight is applied to the body, the ceiling of the vehicle, the door trim, the clothing, the seat of the vehicle, and the glass of the vehicle.
- thermometer side device using the three-dimensional thermal image configured as described above in more detail as follows.
- thermometer-side device according to an embodiment of the present invention, as shown in Figure 9, the sensor correction step (S10), thermal image measurement step (S20), stereo matching step (S30), and three-dimensional thermal image forming step
- the 3D stereoscopic image of the vehicle interior is formed through S40.
- the temperature filtering step (S50), the thermal image correction step (S60), the temperature compensation step (S70), the temperature recompensation step (S80) further through to form a 3D stereoscopic thermal image of the vehicle interior.
- the sensor correction step (S10) is a step of correcting the distortion of the thermal image of the stereo infrared sensor (3,4) disposed in the vehicle interior, as shown in Figure 9 and 10, the distortion of the optical image
- the temperature correction is performed by changing the arrangement of the correction plates in which the cold and hot areas are alternately arranged like the checkered pattern at various positions with a certain distance from the sensors 3 and 4, and then A calibration matrix is extracted from the thermal image information by performing a calibration according to a general optical calibration method.
- the thermal image measuring step S20 measures the thermal image of the vehicle interior by the stereo infrared sensors 3 and 4 calibrated in the sensor correction step S10, as shown in FIGS. 9 and 10.
- each of the sensors 3 and 4 measures a thermal image of the same point on the virtual coordinates configured in the vehicle interior to form a thermal image of each 2D.
- a temperature filtering step S50 may be performed.
- the temperature filtering step S50 may be performed as illustrated in FIGS. 9 and 10.
- the image quality of the thermal image is improved, for example, the heat output from the infrared sensors 3 and 4.
- the image quality of the thermal image is improved by removing the noise in various ways such as removing fixed pattern noise from the image signal.
- the thermal image calibration step (S60) may be performed before performing the stereo matching step (S30), the thermal image calibration step (S60). 9 and 10, the thermal image measured in the thermal image measurement step (S20) according to the calibration characteristic value of the infrared sensors (3,4) obtained in the sensor correction step (S10).
- rectification is performed on the calibrated thermal image using a calibration characteristic value obtained in the sensor calibrating step S10, that is, a calibration matrix.
- the rectification for the thermal image is a process of satisfying the epipolar constraint of the thermal image measured by each of the left and right infrared sensors 3 and 4, and according to the epipolar condition, the stereo sensor 3, When the optical axes of 4) are parallel, one point of the thermal image measured by one sensor 3 corresponds to one point of the thermal image measured by the other sensor 4, and at this time, the line connecting the two corresponding points It is called a line.
- the stereo matching step S30 compares respective thermal images calibrated in the above-described thermal image correcting step S60, and coordinate disparities between corresponding points of the respective thermal images.
- the thermal image measured by the stereo sensors 3 and 4 is referenced to the thermal image of any one of the thermal images, and the other thermal image is targeted.
- the position in the thermal image of a specific pixel projected on the image and the target thermal image is obtained.
- the variation is finally obtained by obtaining the difference in the thermal image coordinates between the corresponding points in the respective thermal images obtained as described above.
- the stereoscopic thermal image forming step (S40) is a step of acquiring a stereoscopic thermal image by imaging and mapping coordinate shifts of the thermal image obtained in the stereo matching step (S30).
- a 3D stereoscopic thermal image is obtained from each thermal image according to a stereo image bonding method.
- the disparity obtained in the stereo matching step S30 is calculated for each pixel of the reference thermal image, and the disparity is stored in a single image to form a disparity map.
- the above process is repeated to generate a plurality of disparity maps according to various viewpoint changes, and finally, by combining the generated disparity maps, a three-dimensional stereoscopic image may be finally obtained.
- the temperature difference generated by the difference between the distances from the specific coordinates of the vehicle interior corresponding to the specific points of the three-dimensional thermal image to each of the sensors 3 and 4 is removed.
- the temperature compensation step (S70) is a temperature comparison step (S71), a temperature difference check step (S72), a temperature error frequency count step (S73), and a temperature value correction step (S74), as shown in FIG. Is done.
- the temperature comparison step (S71) is a step of comparing the temperature values for specific coordinates of the vehicle interior repeatedly measured as shown in Figure 10, obtained in the three-dimensional thermal image forming step (S40) After repeatedly measuring the temperature measurement values of the infrared sensors 3 and 4 with respect to various specific coordinates of the vehicle interior corresponding to various specific points of the three-dimensional thermal image, the measured temperature measurement values are compared with each other.
- the temperature difference checking step S72 is a step of checking whether the difference between the temperature measurement values compared in the temperature comparing step S71 is within an allowable limit. It is checked whether the temperature difference between the temperature measurement values on each specific coordinate compared in S71 is outside the allowable value Ttol.
- the temperature error frequency counting step S73 is a step of counting the frequency at which the temperature difference checked in the temperature difference checking step S72 is outside the allowable value Ttol, as shown in FIG. 10, and checking the temperature difference step S72. ).
- the coordinates at which the difference in temperature measurement values measured by the left and right sensors 3 and 4 with respect to specific coordinates of the vehicle interior are outside the allowable value Ttol are viewed as error points, and the frequency of occurrence of such error points is counted.
- the temperature value correcting step S74 is a step of resolving the temperature difference between the measured temperature values by the left and right stereo sensors 3 and 4 when it is outside the allowable value Ttol.
- the frequency of occurrence of the error point counted in the temperature error frequency counting step S73 becomes 50% or more, for example, the temperature measurement values by the one-side sensors 3 and 4 which have caused the error are collectively offset and the left and right sensors 3, 4) Compensate for deviations in temperature readings.
- the error point occurrence frequency is less than 50%, since the difference between the temperature values measured by the left and right sensors 3 and 4 does not deviate much from the allowable value Ttol, the pixel of the thermal image corresponding to the coordinate is corrected. To compensate for deviations in temperature readings.
- the temperature recompensation step (S80) is a final step of determining the three-dimensional thermal image, as shown in Figure 10, through the temperature compensation step (S70) to the distance difference between the left and right sensors (3,4) After removing the temperature difference caused by the result, the variation according to the material of the temperature measurement target part is finally compensated again.
- the temperature recompensation step (S80) takes into account the inherent emissivity of each member of the vehicle, that is, seat, ceiling, glass, etc., stored in advance according to the coordinate information of the vehicle interior or by body parts of the passenger.
- the temperature compensation step (S70) the temperature value of the stereoscopic thermal image, in which the temperature difference according to the distance difference between the left and right sensors 3 and 4 is removed again, is compensated.
- the intrinsic emissivity of each temperature measuring part is 1, such as a black body, an ideal body is 1, for example, the human body is 0.95, the glass is 0.5, the ceiling is 0.8.
- the temperature distribution of the vehicle interior can be measured three-dimensionally by a pair of stereo infrared sensors arranged left and right on the front side of the vehicle interior, Measurement accuracy and accuracy of the distribution can be further improved.
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Abstract
Description
Claims (20)
- 차량 실내의 전면 일측에 상호 이격되도록 각각 배치되어 탑승자를 포함하여 상기 차량 실내에 대한 열화상을 계측하는 한 쌍의 스테레오 적외선 센서(3,4);상기 한 쌍의 스테레오 적외선 센서(3,4)에 의해 계측되는 2D 열화상을 3D 열화상으로 입체화하는 연산부(10); 및상기 차량 실내의 온도에 영향을 미치는 변수값에 따라 상기 연산부(10)에서 입체화된 3D 열화상 정보를 보정하는 제어부(20);를 포함하여 이루어지는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 1에 있어서,상기 한 쌍의 스테레오 적외선 센서(3,4)는 각각 차량 시트 중 전방시트 중 어느 하나(5 또는 6)와 후방시트 2석(7,8)에 대한 온도를 계측하도록 배치되는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 2에 있어서,상기 스테레오 적외선 센서(3,4)는 상기 차량의 룸미러(15) 후방에 인접하여 배치되는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 2에 있어서,상기 스테레오 적외선 센서(3,4)는 적외선 렌즈가 협각 렌즈인 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 4에 있어서,상기 스테레오 적외선 센서(3,4)는 적외선 렌즈의 화각이 55° 내지 75°인 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 2에 있어서,상기 스테레오 적외선 센서(3,4)는 상기 차량의 룸미러(15) 좌우 끝단에 배치되는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 1에 있어서,상기 한 쌍의 스테레오 적외선 센서(3,4)는 각각 차량 시트 중 후방시트 2석 중 어느 하나(7 또는 8)와 전방시트 2석(5,6)에 대한 온도를 계측하도록 배치되는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 7에 있어서,상기 스테레오 적외선 센서(3,4)는 상기 차량의 좌우 A-필러(11,12)에 각각 배치되는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 7에 있어서,상기 스테레오 적외선 센서(3,4)는 적외선 렌즈가 협각 렌즈인 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 9에 있어서,상기 스테레오 적외선 센서(3,4)는 적외선 렌즈의 화각이 55° 내지 75°인 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 7에 있어서,상기 스테레오 적외선 센서(3,4)는 상기 차량의 좌우 A-필러(11,12)의 하단부에 각각 배치되는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 1에 있어서,상기 제어부(20)는,차량 실내에 배치되는 스테레오 적외선 센서(3,4)를 칼리브레이션하여 열화상의 왜곡을 보정하는 센서 보정단계(S10);상기 센서 보정단계(S10)에서 칼리브레이션된 상기 센서(3,4)에 의해 상기 차량 실내의 열화상을 계측하는 열화상 계측단계(S20);상기 열화상 계측단계(S20)에서 계측된 각각의 열화상을 비교하여 각 열화상의 대응점 간 좌표 변이를 구하는 스테레오 매칭단계(S30); 및상기 스테레오 매칭단계(S30)에서 구한 좌표 변이를 영상화하여 맵핑함으로써 입체 열화상을 획득하는 입체 열화상 형성단계(S40);를 거쳐서 상기 연산부(10)에 의해 입체화된 3D 열화상에 대한 온도정보를 보정하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 12에 있어서,상기 제어부(20)는,상기 열화상 계측단계(S20)에서 계측된 열화상에서 열 잔상 및 떨림 그리고 노이즈를 제거하는 온도 필터링단계(S50);를 더 거쳐서 상기 연산부(10)에 의해 입체화된 3D 열화상에 대한 온도정보를 보정하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 12에 있어서,상기 제어부(20)는,상기 센서 보정단계(S10)에서 획득한 상기 센서(3,4)의 칼리브레이션 특성값에 따라 상기 열화상 계측단계(S20)에서 계측한 열화상을 렉티피케이션하는 열화상 교정단계(S60);를 더 거쳐서 상기 연산부(10)에 의해 입체화된 3D 열화상에 대한 온도정보를 보정하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 1에 있어서,상기 제어부(20)는,상기 차량 실내에 대한 열화상을 계측하는 한 쌍의 스테레오 적외선 센서(3,4)로부터 차량 실내의 특정 좌표까지의 거리가 일정 거리 이상이 되어 멀다고 판단되는 경우, 상기 특정 좌표에 대해 계측된 온도 계측값을 더 높은 온도값으로 보상하는 보정을 하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 1에 있어서,상기 제어부(20)는,상기 차량 실내의 특정 좌표에 대한 상기 한 쌍의 스테레오 적외선 센서(3,4) 각각에서 계측되는 온도 계측값을 반복하여 비교하고, 비교된 온도차가 허용치(Ttol) 이상인 경우 상기 한 쌍의 스테레오 적외선 센서(3,4)에 고장이 발생한 것으로 판단하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 16에 있어서,상기 제어부(20)는,상기 비교된 온도차가 상기 허용치(Ttol)를 벗어나는 경우, 상기 차량 실내의 특정 좌표 오류점으로 보고, 상기 오류점의 발생 빈도를 카운팅하고, 카운팅한 상기 오류점의 발생빈도가 50% 이상일 때는 상기 한 쌍의 스테레오 적외선 센서(3,4)에 의한 온도 계측값을 일괄하여 오프셋 처리하고, 상기 오류점의 발생빈도가50% 미만일 때는 상기 허용치(Ttol)를 벗어난 온도차가 발생한 상기 특정 좌표에 해당하는 열화상의 해당 픽셀의 온도값을 보정하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 16에 있어서,상기 제어부(20)는,상기 비교된 온도차가 상기 허용치(Ttol)를 벗어나는 경우, 상기 차량 실내에 위치하는 별도 부재에 대한 미리 마련된 온도 계측값을 이용하여 상기 한 쌍의 스테레오 적외선 센서(3,4) 중 오류가 발생한 적외선 센서(3,4)를 감지하고, 오류가 발생한 적외선 센서(3,4)에 의해 계측된 열화상의 온도값을 보정하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 1에 있어서,상기 제어부(20)는,상기 차량 실내의 좌표정보에 따라 사전에 파악되어 있는 각 부재의 재질 별로 또는 인체의 부위 별로 마련되는 고유 방사율을 감안하여, 상기 입체 열화상의 온도값을 보상하여 상기 연산부(10)에 의해 입체화된 3D 열화상에 대한 온도정보를 보정하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
- 청구항 19에 있어서,상기 제어부(20)는,상기 차량 실내의 좌표정보에 따라 사전에 파악되어 있는 각 부재의 재질 별로 또는 인체의 부위 별로 입체 열화상의 온도값을 보상함에 있어서, 각 부재 별로 또는 인체의 부위 별로 복사에너지 가중치를 두어 상기 입체 열화상의 온도값을 보상하되, 가중치의 크기 순서는 인체, 차량의 천정, 도어 트림, 의복, 차량의 시트,차량의 유리 순으로 적용하는 것을 특징으로 하는 입체 열화상을 이용한 차량 내 온도계측 장치.
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- 2013-06-26 KR KR1020130073438A patent/KR101724788B1/ko active IP Right Grant
- 2013-06-26 WO PCT/KR2013/005646 patent/WO2014003433A1/ko active Application Filing
- 2013-06-26 CN CN201380019434.XA patent/CN104220854B/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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KR20140001766A (ko) | 2014-01-07 |
CN104220854A (zh) | 2014-12-17 |
CN104220854B (zh) | 2017-10-24 |
DE112013003301T5 (de) | 2015-06-11 |
US20150103141A1 (en) | 2015-04-16 |
KR101724788B1 (ko) | 2017-04-10 |
US10132666B2 (en) | 2018-11-20 |
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