JP2006090924A - Device for processing display signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance resolution in a pseudo manner where as if the number of pixels is increased with an equivalent manufacturing cost to traditional devices, by means of signal processing for a domain to be detected, using a linear supplementary technique. <P>SOLUTION: A device is equipped with: an optical receiver for measuring a plurality of the relative humidity differences without contact; a temperature measuring circuit for measuring the temperature of the optical receiver itself; a calculating circuit where the temperature and the relative humidity difference are calculated from the temperature measuring circuit, the temperatures for each monitored domain are computed, and then the calculated results are output; and a storage section holding the calculated results. The device generates an intermediate value between the first calculated result and the second calculated result, enhances resolution in pseudo manner, and finally makes the contours to be clear-cut. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display signal processing device that detects a heat ray image using heat radiated from an object, for example, far infrared rays, and detects the presence of a fire, a person, and the like, and the temperature of the object.

  A thermocouple is a device that generates a direct-current voltage by using the Seebeck effect that converts incident far infrared rays into heat and directly converts heat into electricity even in the case of far infrared rays emitted from a minute human body.

  With the Seebeck effect above, thermoelectromotive force is generated when both ends of dissimilar metal wires, which are different materials, are connected, one contact is heated, and the other is cooled. It refers to the characteristic that produces this thermoelectromotive force. A sensor for measuring the temperature difference between the contacts from the magnitude of the electromotive force using this effect is called a thermocouple. Furthermore, what connected many thermocouples and made output voltage high is called a thermopile (thermopile).

  A two-dimensional thermopile array is a combination of the above-described thermopile that can measure the amount of change in heat in a certain area by vertically and horizontally.

  Conventionally, a two-dimensional thermopile array is installed on a ceiling surface of a microwave oven or the like, and is used as a device that measures the temperature of an object to be measured without touching it directly.

  Specifically, the microwave oven can measure the temperature distribution of an object to be measured placed on the turntable using the turntable as a measurement area of a two-dimensional thermopile array. The above technique is described in Reference 1.

  Further, the above-described two-dimensional thermopile array technology has been adopted as a human body detection technique, and an illumination lamp incorporating a two-dimensional thermopile array has been proposed.

The thermopile can detect the presence of a fire or a person based on the amount of change in heat, and is useful as a display signal processing device. In recent years, thermopile is also highly expected as a fire alarm and a human body detection security device. The technique of human body detection is described in Reference Document 2.
JP 2001-355853 A JP 2000-223282 A

  However, the following problems have occurred in the background art. The temperature distribution projected in the detected area is displayed by using the detected area in the light receiving unit arranged for each divided area. When trying to identify the displayed object based on the temperature distribution, if the divided area is rough, it looks like a mosaic and it is difficult to specify the object being displayed.

  If the divided area is made finer and displayed at a high resolution, the number of light receiving units to be arranged increases and the price of the display signal processing device increases.

  A main invention according to the present invention is arranged so as to divide a monitoring region for monitoring, and in a temperature correction processing apparatus having a plurality of light receiving units for measuring the amount of heat in the monitoring region, the monitoring region is divided for each light receiving unit. A light receiving unit that measures the relative temperature difference between each monitoring region in a non-contact manner, a temperature measurement circuit that measures the temperature of the light receiving unit itself, and calculates the temperature and the relative temperature difference from the temperature measurement circuit, A calculation circuit that calculates a temperature for each monitoring region and outputs a calculation result; and a display unit that displays the calculation result by changing a hue according to the temperature. The unit of the display unit is a unit of the light receiving unit. It has more units, and newly creates and outputs an intermediate value between the first calculation result and the second calculation result between the first calculation result and the second calculation result from the calculation circuit, To do.

  Further, other features of the present invention will become apparent from the accompanying drawings and the description of the present specification.

  As described above, according to the present invention, it is possible to increase the resolution in a pseudo manner by increasing the number of pixels at a manufacturing cost equivalent to that of the conventional product by performing signal processing on the detected region using the linear interpolation method. .

  Further, by using it in a heat ray detector, there is an advantage that it is easy to specify the displayed object by increasing the resolution, and a highly accurate fire alarm and human body detection security device can be created.

  Details of the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram showing a display signal processing apparatus of the present invention. In the display signal processing apparatus shown in FIG. 1, a thermopile far infrared area sensor 1 has a two-dimensional thermopile array 2, a scan circuit 3, and a temperature sensor device 4 inside.

The detected area 5 indicates a target area where the temperature is measured.
The detected area 5 is reduced and taken into the thermopile far infrared area sensor 1 through the lens 6. The two-dimensional thermopile array 2 obtains a weak electromotive force proportional to the amount of far-infrared rays for each area obtained by dividing the detection area 5 reduced by the lens 6 into 32 (vertical) × 32 (horizontal) areas.

  Based on the weak electromotive force, the two-dimensional thermopile array 2 can acquire temperature information for each area of the detected region 5.

  The temperature information for each area of the detection area 5 actually obtained by the two-dimensional thermopile array 2 is a temperature difference between the detection area 5 and the two-dimensional thermopile array 2 itself. The two-dimensional thermopile array 2 can know only the temperature difference from itself for each area of each divided detection target area 5.

  The temperature of the two-dimensional thermopile array 2 itself can be measured by the temperature sensor device 4.

  Accordingly, the microcomputer 9 calculates the temperature information for each area of the detected area 5 obtained by the two-dimensional thermopile array 2 to the temperature information from the temperature sensor device 4, thereby calculating 32 (vertical) × 32 of the detected area 5. Temperature information for each area divided into (horizontal) can be obtained.

  The scan circuit 3 incorporated in the thermopile far infrared area sensor 1 receives a clock signal and a reset signal from the outside. Each time the reset signal is received, the scan circuit 3 initializes the value of the counter mounted in the scan circuit 3 and returns it to zero.

  The counter mounted in the scan circuit 3 is incremented by one in synchronization with the rising edge of the input clock signal.

  The area divided by 32 (vertical) × 32 (horizontal) of the two-dimensional thermopile array 2 has addresses in order from the upper left corner. The scan circuit 3 sequentially outputs the address value assigned to the two-dimensional thermopile array 2 to the two-dimensional thermopile array 2 by using the count value that increases one by one.

  The two-dimensional thermopile array 2 that has received the address outputs information on the temperature difference acquired sequentially for each corresponding area as a potential difference (voltage).

  The above-described potential difference is output from the P terminal and the N terminal that are output terminals of the thermopile far-infrared area sensor 1. The P terminal is a P channel terminal and the polarity means plus, and the N terminal is an N channel terminal and the polarity means minus.

  The P terminal and N terminal output from the thermopile far infrared area sensor 1 are input to the amplifier 7. The amplifier 7 is a differential amplifier circuit, which amplifies the potential difference according to the potential difference between the P terminal and the N terminal and outputs the amplified signal as an output signal from the amplifier 7.

  Since the electromotive force generated in the two-dimensional thermopile array 2 is weak, the amplifier 7 needs to amplify at a high magnification.

  The amplifier 7 of this embodiment amplifies the potential difference between the P terminal and the N terminal by several thousand times, and outputs the amplified difference to the low pass filter (LPF) 8.

  The LPF 8 is a low-pass filter composed of a resistor and a capacitor. The LPF 8 smoothes a rapidly increasing noise component in the signal included in the potential difference amplified by the amplifier 7 and outputs the smoothed noise component to the 12-bit A / D converter 10 in the microcomputer 9.

  The 12-bit A / D converter 10 converts the analog signal input from the LPF 8 into 12-bit digital data.

  Further, the temperature sensor device 4 outputs temperature information of the two-dimensional thermopile array 2 itself as a potential difference.

  The temperature information of the two-dimensional thermopile array 2 itself is input to the 12-bit A / D converter 11 and converted into 12-bit digital data by the 12-bit A / D converter 11.

  The CPU 12 indicates the temperature difference between the temperature information of the two-dimensional thermopile array 2 itself from the 12-bit A / D converter 11 and the two-dimensional thermopile array 2 for each divided area from the 12-bit A / D converter 10. The voltage output is calculated to obtain temperature information for each area divided into 32 (vertical) × 32 (horizontal).

  The temperature information here is a relative temperature difference indicating a difference between the temperature of each area of the detected region 5 and the temperature of the two-dimensional thermopile array 2. That is, it can be seen how much the temperature for each area of the detected region 5 is relatively higher or lower than that of the two-dimensional thermopile array 2.

  In order to obtain temperature information for each area of the detected area 5, the CPU 12 sets the two-dimensional thermopile array to a relative temperature difference indicating the difference between the temperature of each area of the detected area 5 and the temperature of the two-dimensional thermopile array 2. Add the temperature information of 2 itself and go ahead.

  The obtained temperature information for each area of the detected area 5 is stored in the SRAM 1 (14) by the CPU 12 via the CPU bus. The temperature information for each 32 × 32 area measured at one time is called one frame, and is collectively processed as one information unit.

  In the present embodiment, the temperature measurement of the detected area 5 is performed about three times per second, and the past three measurement results are stored in the SRAM 1 (14). In the SRAM 1 (14), whenever the temperature is newly measured, the oldest measurement result is continuously deleted and updated. A program relating to a series of processing is stored in the PROM 13. The PROM 13 is composed of a nonvolatile memory called a flash ROM. Therefore, when the program is modified, it can be rewritten and is easy to use.

  Further, the SRAM 1 (14) and the SRAM 2 (15) illustrated in FIG. 1 are illustrated separately. In the memory used for the CPU, the entire memory is generally divided into several parts and managed. When access from the CPU to the memory is requested, one target section is selected from the set of partitioned memories based on the memory address information and the like, and reading or writing is executed. The memory division at this time is called a bank.

  The above bank may be used to divide the memory into two banks, each of which may be SRAM1 (14) and SRAM2 (15), and two SRAMs may be used.

  When this bank is used, a part of the built-in memory address decoder can be shared as compared with the case where SRAM1 (14) and SRAM2 (15) are provided separately. The chip area can be reduced.

  Now, with the display signal device shown in FIG. 1, temperature information can be obtained for each area of the detected area 5 divided by 32 (vertical) × 32 (horizontal) of the two-dimensional thermopile array 2. Since the screen is 32 (vertical) × 32 (horizontal), the number of pixels is 1024. It is possible to recognize how coarse the number of pixels is for the number of scanning lines of normal television broadcasting with respect to 525 lines (number of effective lines 480).

  To simply increase the number of pixels, it is necessary to equip one pixel with one thermopile array, leading to a direct cost increase.

  Further, when a small number of pixels are displayed on a television, only the roughness of the screen becomes conspicuous.

  Since the display example shown in FIG. 2 is 32 (vertical) × 32 (horizontal), the measurement result measured at 1024 pixels is enlarged and displayed on 102400 pixels of 320 (vertical) × 320 (horizontal). In this case, the contour that specifies the object becomes jagged, and it becomes difficult to distinguish, for example, “adult” and “child”, “person” and “animal” from the projected contour (outer shape).

  In the embodiment of the present invention shown in FIG. 3, after actually storing the actual measurement result in the SRAM (14), the CPU 12 is used to store the data in the SRAM (14) 10 times in the vertical direction and 10 times in the horizontal direction. Thus, the data amount is 100 times as large as the area.

  When the data amount is 100 times, the measured value is not only simply enlarged as shown in FIG. 2 but also measured using 20 pixel data of 2 (vertical) × 2 (horizontal). (Vertical) × 20 pixels are placed at the four corners of 400 pixels. First, the data of the upper end and the lower end are determined by the ratio of distances using the four measured values.

  For example, the value of the first row and the second column is determined by the first row, the first column “1” and the first row, the 20th column “3”, which are measurement values placed at the four corners. The value in the first row and the second column is closer in distance to the first row and the first column than the first row and the 20th column. When creating data, the influence of the data in the first row and the first column is affected. Set to receive strongly.

  As shown by the mathematical formula, the position of the first row and the second column has a distance ratio of 1:18 in the first row, the first column, the first row and the 20th column, and the addresses are simply compared. Just ask for it.

  Since the closer distance has a stronger influence, the result of multiplying “1” by 18 and “3” by 1 is added and divided by 19.

  Similarly, the position of the first row and the third column is 2:17 in the first row and the first column: the first row and the 20th column, and the closer distance has a stronger influence, The result obtained by multiplying “1” by 17 and “3” by 2 can be added and divided by 19.

  By repeating this operation, it is possible to obtain all the values in the first row as the upper end. Next, the lower 20th line is obtained in the same manner as the upper end.

After obtaining the upper and lower ends, the logic used at the upper and lower ends is applied to the first column, and sequentially applied to the 20th column. By this operation, pseudo measurement values of 400 pixels of 20 (vertical) × 20 are calculated from four measurement values of 2 (vertical) × 2 (horizontal), and the data obtained by the calculation is sequentially stored in the SRAM (15 ) To remember.

  Therefore, the data size of the SRAM (15) is 100 times larger than the measured value of the SRAM (14).

  The data stored in the SRAM (15) is output to the outside of the microcomputer 9 using the USB 16, and the personal computer 18 receives the data output from the USB 16 and displays it on the screen.

  Displayed data Unlike the prior art of FIG. 2, in the embodiment of FIG. 3, the boundary line of the projected object is difficult to understand, but the outline (outer shape) is clear. At the same time as the projected object becomes larger, the resolution can be increased, albeit in a pseudo manner.

  As mentioned above, although embodiment of this invention was described concretely based on the embodiment, it is not limited to this and can be variously changed in the range which does not deviate from the summary.

It is a block diagram which shows the display signal processing apparatus which concerns on one Example of this invention. It is a figure which shows the specific operation | movement which concerns on one Example of the past. It is a figure which shows the specific operation | movement which concerns on one Example of this invention.

Explanation of symbols

  1 Thermopile array, 2 Two-dimensional thermopile array, 3 Scan circuit, 4 Temperature sensor device.

Claims (3)

In a display signal processing device that is arranged to monitor and divide a monitoring area and has a plurality of light receiving units that measure the amount of heat in the monitoring area,
A light receiving unit that measures a relative temperature difference between each monitoring region divided for each light receiving unit in a non-contact manner;
A temperature measuring circuit for measuring the temperature of the light receiving unit itself;
A temperature and the relative temperature difference are calculated from the temperature measurement circuit, a temperature for each of the monitoring areas is calculated, an intermediate value between the first calculation result and the second calculation result is calculated, and a first value is calculated according to the intermediate value. A calculation circuit for generating a display signal representing brightness or color different from the first and second calculation results;
A storage unit for temporarily storing data during calculation in the calculation circuit;
A display signal comprising: a display unit having a plurality of display units for displaying the first calculation result, the second calculation result, and the brightness or color corresponding to the display signal from the calculation circuit. Processing equipment.
In a display signal processing device that is arranged to monitor and divide a monitoring area and has a plurality of light receiving units that measure the amount of heat in the monitoring area,
A light receiving unit that measures a relative temperature difference between each monitoring region divided for each light receiving unit in a non-contact manner;
A temperature measuring circuit for measuring the temperature of the light receiving unit itself;
A calculation circuit that calculates a temperature and the relative temperature difference from the temperature measurement circuit, calculates a temperature for each monitoring region, and outputs a calculation result;

A storage unit for temporarily storing data during calculation in the calculation circuit;
A display unit having a plurality of display units for displaying brightness or color according to a calculation result from the calculation circuit,

The calculation circuit is arranged at the four corners of the display unit corresponding to the magnification for enlarging and displaying the calculation results of two adjacent vertical columns and two horizontal rows, and is formed into a quadrangle with the display units arranged at the four corners as vertices. In the display unit corresponding to the upper and lower ends of the enclosed display unit,
A first display signal that is an intermediate value that changes the brightness or color different from the measurement results of the two vertical rows and two horizontal steps in a stepwise manner is generated, and the first display signal is used to generate the first display signal at the upper and lower ends. Similarly, a display signal processing apparatus that generates a second display signal that is an intermediate value that changes the brightness or color in a stepped manner in the sandwiched display unit. 3. The display signal processing device according to claim 1, wherein the display signal processing device is used in a heat ray detector.

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