WO2015029378A1 - 熱画像センサ及び空気調和機 - Google Patents
熱画像センサ及び空気調和機 Download PDFInfo
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- WO2015029378A1 WO2015029378A1 PCT/JP2014/004249 JP2014004249W WO2015029378A1 WO 2015029378 A1 WO2015029378 A1 WO 2015029378A1 JP 2014004249 W JP2014004249 W JP 2014004249W WO 2015029378 A1 WO2015029378 A1 WO 2015029378A1
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- 238000001514 detection method Methods 0.000 claims abstract description 23
- 241000282414 Homo sapiens Species 0.000 abstract description 19
- 230000006870 function Effects 0.000 description 24
- 238000010586 diagram Methods 0.000 description 14
- 238000011156 evaluation Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000036544 posture Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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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
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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
- G01J5/026—Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control
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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
- G01J5/0275—Control or determination of height or distance or angle information for sensors or receivers
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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
- G01J5/07—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
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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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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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2120/00—Control inputs relating to users or occupants
- F24F2120/10—Occupancy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2120/00—Control inputs relating to users or occupants
- F24F2120/10—Occupancy
- F24F2120/12—Position of occupants
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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
-
- 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
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J2005/106—Arrays
Definitions
- the present invention relates to a thermal image sensor and an air conditioner that enable advanced human detection such as individual parts and postures of persons in a room.
- the conventional thermal image sensor is composed of a thermopile arranged in the vertical direction, and acquires an overall thermal image of the room by scanning the vertical sensor from left to right and from right to left at regular intervals. At this time, the thermal image sensor acquires a thermal image of the entire room at the time of initial start-up, stores this as a background thermal image, and thereafter, every time a new overall thermal image is obtained, the whole thermal image and the background thermal image are The difference is calculated, and it is determined that there is a person at the corresponding pixel position when the difference value maintains a value equal to or higher than the human body detection threshold (for example, Patent Document 1).
- thermopiles In the thermal image sensor of the background art, a thermal image is generated by scanning in a horizontal direction a sensor in which a small number of inexpensive thermopiles are arranged vertically, and image processing is added to this.
- inexpensive person detection By using this person detection function, it is possible to perform air conditioning control in which air is positively applied to a person or not.
- a more comfortable air conditioner requires a function that avoids direct wind on the human face and a function that warms the feet in winter, and requires more accurate human detection that can detect human parts. It is.
- thermopiles arranged in the vertical direction in the background art By increasing the number of thermopiles arranged in the vertical direction in the background art, this highly accurate person detection can be realized.
- the present invention has been made to solve the above-described problems, and a thermal image sensor and an air conditioner that enable highly accurate person detection without requiring an increase in memory capacity or an enhancement in CPU capability.
- the purpose is to obtain.
- a thermal image acquisition unit that acquires temperature data for each pixel arranged in a predetermined direction is scanned in units of one step in a direction perpendicular to the predetermined direction, and acquired in each step.
- a thermal image sensor that synthesizes a one-dimensional thermal image to acquire a two-dimensional thermal image, and outputs the positions of effective detection pixels selected in the immediately preceding step from all pixels included in the thermal image acquisition unit as effective pixels
- a humanity generation unit that calculates humanity, a pixel weight calculation unit that generates a weight value for all pixels from the relative position and humanity of each pixel from the effective pixel, and the next from all pixels in descending order of the weight value Ste Those having a total pixel sorting unit for selecting a detected effective pixels used in flop.
- FIG. 1 is an explanatory diagram showing an example of the overall configuration of an air conditioner equipped with a thermal image sensor according to Embodiment 1 of the present invention.
- the air conditioner 1 includes an indoor unit 12 and an outdoor unit 13.
- the indoor unit 12 includes a thermal image sensor 11.
- FIG. 2 is an explanatory diagram showing an example of the configuration of the thermal image sensor 11.
- the thermal image sensor 11 includes a thermal image acquisition unit 10 and a control unit 14.
- the thermal image acquisition unit 10 includes a thermopile arranged in the vertical direction, for example, and can acquire a one-dimensional thermal image.
- a one-dimensional thermal image of N pixels N is a natural number
- the control unit 14 controls acquisition of a thermal image in the thermal image acquisition unit 10 including scanning. As shown in the figure, the position of each pixel in the thermal image acquisition unit 10 is defined from the top to the bottom.
- the position of the top pixel is 1, and the position of the bottom pixel is N.
- the thermal image acquisition unit 10 in which pixels are arranged in the vertical direction as a predetermined direction is scanned in the left-right direction perpendicular to the predetermined direction, but is not limited thereto.
- it can be configured such that pixels are arranged in the left-right direction and scanned in the up-down direction.
- FIG. 3 is a diagram for explaining a basic operation for acquiring a two-dimensional thermal image in the thermal image acquisition unit 10.
- a vertical thermal image 21 which is a one-dimensional vertical thermal image is acquired in a time-sharing manner.
- the position where the thermal image is acquired is scanned in the horizontal direction, and the thermal image acquired at each position is synthesized to generate the entire room thermal image 22 which is a two-dimensional thermal image of the entire room.
- the vertical direction thermal image 21 a is acquired as the vertical direction thermal image 21.
- the vertical direction thermal image 21b is acquired as the vertical direction thermal image 21.
- the vertical direction thermal image 21n is acquired as the vertical direction thermal image 21.
- the thermal image acquisition unit 10 scans the thermal image acquisition position from side to side, and acquires the vertical direction thermal image 21 at each horizontal position.
- the thermal image acquisition unit 10 combines the plurality of acquired vertical thermal images 21 to generate an entire room thermal image 22.
- the horizontal scanning can be realized, for example, by driving a thermopile with a stepping motor.
- FIG. 4 is a diagram for explaining the operation of the control unit 14.
- An effective pixel to be used for acquisition is determined, and an effective pixel index i for specifying each effective pixel is generated.
- the number of effective pixels is smaller than the number of all pixels.
- the effective pixel position xi corresponding to the effective pixel index i is obtained by the following equation (1), where Ns is the total number of pixels included in the thermal image acquisition unit 10 and Nmax is the determined number of effective pixels. At this time, the effective pixel index i is an integer from 1 to Nmax.
- FIG. 5 is a diagram for explaining the effective pixels determined by the uniform arrangement unit 111.
- each square represents a pixel.
- effective pixels are represented by Pe and filled in gray.
- S1 shown in the drawing represents the scanning direction when acquiring a thermal image.
- the total number of pixels included in the thermal image acquisition unit 10 is twice the number of effective pixels.
- the effective pixel corresponding to the equally arranged effective pixel index i is defined as an initial effective pixel, and the position xi of the initial effective pixel is defined as an initial effective pixel position.
- the uniform arrangement unit 111 outputs an effective pixel index and an initial effective pixel position.
- the uniform arrangement unit 111 functions as an initial arrangement unit that determines the arrangement of the initial effective pixels.
- the initial effective pixels are assumed to be evenly arranged on all the pixels in the uniform arrangement unit 111, but are not necessarily completely uniform, and are often arranged in a region that is likely to be detected by a person. Such an initial arrangement may be used.
- the effective pixel selection unit 112 selects and outputs the initial effective pixel position determined by the uniform arrangement unit 111.
- the detection effective pixel position determined by the effective pixel determination unit 152 described later is selected and output.
- the initial value of the effective pixel selection flag is 0, and the initial effective pixel position determined by the uniform arrangement unit 111 is selected in the first operation.
- the uniform arrangement unit 111 and the effective pixel selection unit 112 operate as the effective pixel output unit 110 that outputs the position of the effective pixel selected from all the pixels.
- the thinning-out scanning unit 120 serving as a scanning unit performs thermal image scanning in one step in the left-right direction using only the effective pixels defined by the effective pixel position selected by the effective pixel selection unit 112, and the temperature data of the effective pixels To get.
- the minimum unit of thermal image scanning is set as one step, and the position where the thermal image is acquired is changed by one step to acquire the thermal image.
- a one-dimensional thermal image which is temperature data acquired by each effective pixel, is obtained.
- FIG. 6 is a diagram for explaining a thermal image obtained by the thinning scanning unit 120.
- the thermal image is composed of temperature data Dt obtained for each effective pixel corresponding to the effective pixel index i.
- the temperature data Dt is expressed in degrees Celsius, for example.
- the number of pixels of the thermal image obtained by the thinning scanning unit 120 is Nmax.
- the civilization function storage unit 131 stores a preset civilization function.
- the civilization calculation unit 132 converts the value of each effective pixel of the thermal image acquired by the thinning scanning unit 120 into the civilization s using a civilization function.
- the civilization function storage unit 131 and the civilization calculation unit 132 operate as the civilization generation unit 130 that calculates civilization for the effective pixels.
- FIG. 7 is an example of the civilization function stored in the civilization function storage unit 131.
- the civilization function represents the relationship between the acquired temperature data Dt and civilization s.
- Humanity is an index for estimating the possibility that a person exists at the position of the corresponding pixel, and is set so that the possibility that a person is present increases as the value increases in the range of 0 to 1.
- the human radiant heat is around 27 degrees, although it depends on the measurement site. However, in consideration of the case where a person exists only in a partial area of the effective pixel and the case where the radiant heat is attenuated due to clothing, the setting is made so as to have civilization even at a low temperature side.
- the civilization function can be defined by a mathematical expression or can be defined in a table format. In FIG.
- P1 is a pixel in which a person exists
- P2 is a pixel in which a person exists only in a part of the pixels.
- P2 is referred to as a partially matched pixel, and the civilization s is determined by the proportion of the person in the pixel and is a value between 0 and 1.
- FIG. 8 is a diagram for explaining the civilization s required by the civilization calculation unit 132.
- the civilization s is generated in association with the effective pixel index i.
- the civilization s shown in FIG. 8 is an example when the civilization function of FIG. 7 is applied to the thermal image of FIG.
- the humanity s of each effective pixel obtained by using the civilization function is calculated by the civilization evaluation unit 141 using a human flag f (i) indicating whether or not there is a person by judging the value using the threshold value th1 of the civilization. Calculated. If the civilization s is greater than the threshold th1, it is determined that there is a person, and if it is less than the threshold th1, a person flag f (i) of 0 is calculated as no person.
- the civilization map generation unit 142 generates a civilization map D including the effective pixel index i and the human flag f (i).
- FIG. 9 is a diagram for explaining a configuration example of the civilization map D.
- the civilization map D is configured to associate the effective pixel index i with the human flag f (i) in the effective pixel.
- the civilization map D shown in FIG. 9 is an example when the civilization threshold th1 is 0.3 with respect to the civilization s in FIG.
- the civilization threshold th1 is a value that is determined at the time of design, and is a value that is appropriately determined through experiments and the like.
- a plurality of operation modes can be provided in the air conditioner, and different values can be used for each operation mode. Thereby, the characteristic which detects a person can be changed for every driving mode.
- the civilization map D is configured to associate the effective pixel index i with the human flag f (i) in the effective pixel, but is not limited to this.
- the effective pixel index i And the civilization s in the effective pixel can be associated with each other.
- the possibility that a person exists in the corresponding effective pixel is represented by a multi-stage value instead of a binary value.
- the process of calculating the human flag f (i) in the civilization evaluation unit 141 is not necessary. That is, the civilization map D only needs to numerically represent the possibility that a person exists in each effective pixel.
- the pixel weight map generation unit 143 generates the weight function w (x) defined by Expression (2), the effective pixel index i, the effective pixel position xi corresponding to the effective pixel index i, and the person flag f (i). Then, a weight value g (x) is obtained from Equation (3), and a pixel weight map W composed of the pixel position x and the weight value g (x) of the pixel position is generated. The weight value is generated for all the pixels including those other than the effective pixels from the human flag obtained only for the effective pixels by Expression (3).
- FIG. 10 is a diagram illustrating an example of the weighting function w (x).
- the weighting function w (x) defines a weighting coefficient at the pixel position x relative to the reference pixel position, and the weighting coefficient decreases as the distance from the reference pixel position increases.
- Expression (3) the relative pixel position with respect to the effective pixel position xi is represented by (x ⁇ xi).
- FIG. 11 is a diagram for explaining the pixel weight map W.
- the pixel weight map W is configured to associate pixel positions x of all the pixels included in the thermal image acquisition unit 10 with weight values g (x) at the pixel positions.
- pixel weight calculation in which the humanity evaluation unit 141, the civilization map generation unit 142, and the pixel weight map generation unit 143 generate weight values for all the pixels from the position of each pixel and the civilization from the effective pixels. It functions as the unit 140.
- the map sort unit 151 compares the sum of the weight values g (x) in the pixel weight map W with a predetermined threshold th2, and sets the value of the effective pixel selection flag according to the comparison result. When the sum of the weight values g (x) is larger than the threshold value th2, the effective pixel selection flag is set to 1. When the sum of the weight values g (x) is less than or equal to the threshold value th2, the effective pixel selection flag is a value at the time of initial setting. It is assumed that 0.
- the threshold th2 is a value that is determined at the time of design, and is a value that is appropriately determined through experiments or the like. A plurality of operation modes can be provided in the air conditioner, and different values can be used for each operation mode. Thereby, the characteristic which detects a person can be changed for every driving mode.
- the map sorting unit 151 sorts the pixel weight map W under the following conditions 1 and 2 in order, and generates an effective pixel map W ′.
- condition 2 is for detection with emphasis on the head rather than the human foot, but is not an essential condition. By adding Condition 2, it becomes possible to detect a face and head sensitive to wind with higher accuracy.
- Condition 1 Weight value g (x) is large
- Condition 2 Pixel position x is small (upper pixel is given priority)
- the effective pixel determination unit 152 selects Nmax pixels, which is the number of effective pixels determined by resources that can be used using the effective pixel map W ′, in the order of arrangement of the effective pixel map W ′, and performs this for the next scan. Is determined as a detection effective pixel that is an effective pixel to be used in the above, and the pixel position of the effective pixel corresponding to the effective pixel index is output.
- the map sorting unit 151 and the effective pixel determining unit 152 function as the all pixel sorting unit 150 that selects detection effective pixels used in the next step from all pixels in descending order of weight values.
- the effective pixel selection unit 112 selects and outputs the initial effective pixel position determined by the uniform arrangement unit 111, and the value of the effective pixel selection flag is In the case of 1, the detection effective pixel position determined by the effective pixel determination unit 152 described later is selected and output.
- the thinning scanning unit 120 uses the effective pixel at the selected pixel position to perform the next one-step scan in the left-right direction. Thereafter, until the horizontal scanning reaches the left or right end, the civilization calculation unit 132, the civilization evaluation unit 141, the civilization map generation unit 142, the pixel weight map generation unit 143, the map sort unit 151, and the effective pixel determination unit 152 Repeat the process.
- the control unit 14 sets the effective pixel selection flag to 0, which is a value at the time of initial setting, and starts the operation from the uniform arrangement unit 111 again. At this time, the scanning position is also reset once.
- the thermal image sensor according to the present embodiment is configured to perform horizontal scanning in the same direction after resetting the scanning position after the horizontal scanning reaches one of the left and right ends, but is not limited thereto. Absent.
- FIG. 12 is an image diagram for visually explaining the dynamic effective pixel arrangement.
- squares represent pixels, and among them, pixels filled in gray represent effective pixels that are dynamically assigned.
- the thermal image by the dynamic effective pixel arrangement is obtained from the thermal image sensor.
- temperature data is not acquired for pixels other than the effective pixels, so that it can be distinguished from the temperature data acquired by the effective pixels by using a predetermined value. it can.
- the thermal image sensor determines the effective pixels that are thinned out uniformly from all the pixels in the vertical direction in accordance with the number of usable pixels determined by the available resources during the first one-step scanning of the horizontal scanning.
- the data acquisition in one step in the vertical direction of the thermal image is performed using only the effective pixels.
- the thermal image sensor separately has a civilization function storage unit that is a database in which temperature data based on a human radiant heat model and humanity are associated with each other. By calculating the civilization from the detected temperature data and thresholding the civilization, it is determined whether there is a person at the effective pixel position, and weighting is performed so that many effective pixels are included in the part where the person is present. Then, the effective pixels are rearranged and used in the next step.
- this thermal image sensor for example, an air conditioner that can detect the position of a person's face, limbs, etc., blows away from the person's face, and warms the feet mainly is used. It becomes feasible.
- the thermal image sensor and the air conditioner according to the present invention scan the thermal image acquisition unit that acquires the temperature data for each pixel arranged in the vertical direction in units of one step in the horizontal direction, and acquire each step.
- a thermal image sensor that obtains a two-dimensional thermal image by synthesizing the one-dimensional thermal image, and the position of the detection effective pixel selected in the immediately preceding step from all the pixels included in the thermal image acquisition unit as the effective pixel
- the effective pixel output unit for outputting, the scanning unit for acquiring the temperature data of the effective pixel by performing scanning in one step, and the effective pixel using the relationship between the civilization and the temperature data representing the possibility that a person exists
- a humanity generation unit that calculates humanity, a pixel weight calculation unit that generates a weight value for all pixels from the relative position and humanity of each pixel from the effective pixels, and the next from all pixels in descending order of weight value No Since Tsu and a total pixel sorting unit for selecting a detected effective pixels used in up, without the need for strengthening of the
- FIG. 13 is a diagram for explaining the operation of the control unit 14 included in the thermal image sensor according to the second embodiment of the present invention.
- the operation of the pixel weight map generation unit 143, the pre-total pixel map storage unit 161, and the pre- The difference from the first embodiment is that it includes a pre-weight coefficient generation unit 160 including an overall pixel weight map generation unit 162.
- the configuration of the thermal image sensor of the present embodiment is the same as that of the first embodiment, and includes the thermal image acquisition unit 10 and the control unit 14.
- the thermal image acquisition unit 10 is the same as that in the first embodiment.
- FIG. 14 is a diagram illustrating an example of a preliminary whole pixel map stored in the preliminary whole pixel map storage unit 161.
- the pre-whole pixel map M is a two-dimensional map that represents the positions of the pixels that are selected as effective pixels at a predetermined time until the latest one-way scanning in the left-right direction is completed.
- the pixel value m (x, y) is associated with it.
- x is the vertical position of the pixel
- y is the horizontal position of the pixel.
- the pre-total pixel map storage unit 161 stores the number of times each pixel is used as an effective pixel during a predetermined period. By comparing this number of times with a predetermined threshold th3, a pixel position with a high frequency selected as an effective pixel is determined, and a prior entire pixel map M is generated.
- the predetermined period and the threshold th3 are values that are determined at the time of design, and are values that are appropriately determined through experiments or the like.
- a plurality of operation modes can be provided in the air conditioner, and different values can be used for each operation mode. Thereby, the characteristic which detects a person can be changed for every driving mode.
- the position of the effective pixel in the scanning is a pixel position with a high selection frequency.
- the pre-total pixel weight map generation unit 162 obtains the pre-weight coefficient g2 (x, y) using Equation (4) using the pre-total pixel map M, and calculates the pixel position and the pre-weight coefficient g2 (x, y) of the pixel position. y) is calculated in advance.
- FIG. 15 is a diagram illustrating an example of the pre-total pixel weight map W2.
- the pre-whole pixel weight map W2 is a two-dimensional map having a value of 1 or 0.5 in association with the position of each pixel.
- the pre-whole pixel map storage unit 161 and the pre-whole pixel weight map generation unit 162 generate a pre-weight coefficient that generates a pre-weight coefficient that becomes a larger value as the frequency of pixels selected as effective pixels in the past predetermined period increases.
- the unit 160 operates as a unit.
- the pixel weight map generation unit 143 generates the weight value g (x) for all the pixels in the vertical direction at each scanning position y0 in the horizontal direction, as in the first embodiment. Further, using the weight value g (x) and the prior weight coefficient g2 (x, y0) at the scanning position y0, a new weight value g3 (x) is obtained by the following equation (5), and the vertical pixel position x And a pixel weight map W including the weight value g3 (x) of the pixel position. Subsequent operations are the same as those in the first embodiment.
- the thermal image sensor and the air conditioner according to the present embodiment generate a pre-weighting coefficient generation unit that generates a pre-weighting coefficient that has a larger value as a pixel with a higher frequency selected as an effective pixel in the past predetermined period.
- the pixel weight calculation unit generates a weight value using a prior weight coefficient.
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Abstract
Description
図1は、本発明の実施の形態1による熱画像センサを搭載する空気調和機の全体構成の一例を示す説明図である。空気調和機1は、室内機12および室外機13で構成される。また、室内機12は熱画像センサ11を備える。
条件1:重み値g(x)が大きい
条件2:画素位置xが小さい(上方の画素を優先する)
図13は、本発明の実施の形態2による熱画像センサが備える制御部14の動作を説明するための図であり、画素重みマップ生成部143の動作と、事前全体画素マップ記憶部161及び事前全体画素重みマップ生成部162からなる事前重み係数生成部160を有する点が実施の形態1におけるものと異なる。なお、本実施の形態の熱画像センサの構成は、前記実施の形態1におけるものと同様であり、熱画像取得部10と制御部14を備える。熱画像取得部10は、前記実施の形態1におけるものと同様である。
Claims (10)
- 所定方向に配列される画素毎に温度データを取得する熱画像取得部を前記所定方向と垂直な方向に1ステップ単位で走査し、各ステップで取得した1次元の熱画像を合成して2次元の前記熱画像を取得する熱画像センサであって、
有効画素として前記熱画像取得部が備える全画素から直前のステップで選択された検知有効画素の位置を出力する有効画素出力部と、
1ステップの前記走査を行って前記有効画素の前記温度データを取得する走査部と、
人が存在する可能性を表す人らしさと前記温度データとの関係を用いて前記有効画素に対して前記人らしさを求める人らしさ生成部と、
前記有効画素からの各画素の相対位置と前記人らしさとから前記全画素に対して重み値を生成する画素重み算出部と、
前記重み値が大きい順に前記全画素から次のステップで使用される前記検知有効画素を選択する全画素ソート部と
を備えることを特徴とする熱画像センサ。 - 前記人らしさ生成部は、
前記人らしさと前記温度データとの関係を表す人らしさ関数を記憶する人らしさ関数記憶部と、
前記有効画素の前記温度データと前記人らしさ関数とを用いて前記有効画素に対して前記人らしさを求める人らしさ算出部と
を備えることを特徴とする請求項1に記載の熱画像センサ。 - 前記人らしさ関数記憶部は、
前記人らしさと前記温度データとの関係をテーブル形式で記憶する
ことを特徴とする請求項2に記載の熱画像センサ。 - 過去の所定期間に前記有効画素として選択された頻度の高い画素ほど大きな値となる事前重み係数を生成する事前重み係数生成部を備え、
前記画素重み算出部は、
前記事前重み係数も用いて前記重み値を生成する
ことを特徴とする請求項1から請求項3のいずれか1項に記載の熱画像センサ。 - 前記所定方向は上下方向であり、
前記全画素ソート部は、
前記重み値が同じ値の場合には、上方に位置する画素から順に選択する
ことを特徴とする請求項1から4のいずれか1項に記載の熱画像センサ。 - 前記有効画素出力部は、
前記全画素から初期有効画素を所定の初期配置となるように選択する初期配置部と、
初期設定時には前記初期有効画素を有効画素として出力し、初期設定時以外には前記検知有効画素を有効画素として出力する有効画素選択部と
を備えることを特徴とする請求項1から請求項5のいずれか1項に記載の熱画像センサ。 - 前記初期配置部は、
前記初期有効画素を前記全画素中に均等に配置するように選択する均等配置部である
ことを特徴とする請求項6に記載の熱画像センサ。 - 前記重み値の総和が所定の閾値以下の場合には、前記初期設定となることを特徴とする請求項6又は請求項7に記載の熱画像センサ。
- 前記走査の最初の1ステップの走査時には、前記初期設定となることを特徴とする請求項6から請求項8のいずれか1項に記載の熱画像センサ。
- 請求項1から請求項9のいずれか1項に記載の熱画像センサを備えた空気調和機。
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CN201480047210.4A CN105492880B (zh) | 2013-08-28 | 2014-08-20 | 热图像传感器以及空气调节机 |
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EP14841001.2A EP3040697A4 (en) | 2013-08-28 | 2014-08-20 | Thermal image sensor and air conditioner |
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