KR20160073464A - Method for Measuring an Over Heat and Apparatus using the same - Google Patents

Abstract

An embodiment of the present invention provides an overheat measurement method capable of detecting overheat by acquiring and analyzing the temperature change of a cooker from a thermal image sensor during the process of cooking and preventing a fire accident due to the overheat by being linked with an alarm unit and a gas circuit breaker and an overheat measurement device using the same. To that end, the present invention includes: a step (A) of acquiring temperature data from each pixel of a thermal image sensor; a step (B) of selecting pixel(s) of which the temperature is higher than a first temperature (T1) among the pixels in the step (A) to generate a region of interest (ROI); a step (C) of generating a buffer to store the feature data of the ROI; a step (D) of extracting temperature features from the feature data; a step (E) of determining overheat of the ROI; and a step (F) of, if the overheat of the ROI is determined in the step (E), outputting the overheat result.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of measuring an overheating,

One embodiment of the present invention relates to a superheat measuring method and an overheat measuring apparatus using the same.

The conventional overheat measuring device is a device for preventing fire caused by overheating of oil and pot during cooking, and measures the bottom temperature of the cooking container and automatically cuts off gas supply when it is overheated to a predetermined temperature or more.

Here, since the accurate temperature measurement is possible only when the top surface of the temperature measuring sensor and the bottom of the cooking container are in close contact with each other, if the cooking container is uneven, the temperature measuring sensor is inclined, the cooking container is not located at the center, or the bottom of the cooking container is concave The temperature measuring sensor may not operate. In addition, the temperature measuring sensor may not operate even in a cooking vessel (heat-resistant vessel, pot casseret, etc.) having a low thermal conductivity.

Open Patent Publication No. 1998-072135 (19981026)

In an embodiment of the present invention, a temperature change of a cooking container is acquired and analyzed by a thermal image sensor during a food cooking process to detect overheating, and the fire alarm caused by overheating can be prevented by interlocking with an alarm unit and a gas- And an overheat measuring device using the same.

In an embodiment of the present invention, a temperature change trend analysis and a method of sensing overheating by sensing a specific high temperature can be detected at the time when water starts to evaporate and start to burn. Regardless of the material and shape of the cooking vessel And a superheat measuring device using the same.

A method for measuring an overheat according to an embodiment of the present invention includes the steps of (A) obtaining temperature data for each pixel with a thermal image sensor, (b) measuring a temperature higher than a first temperature (T1) (C) generating a buffer capable of storing the feature data of the ROI, and extracting a temperature characteristic (D) from the feature data by selecting a pixel having the ROI (E) determining an overheating of the region of interest, and (F) outputting an overheating result when it is determined in the step (E) that the overheating is overheated.

The method may further include a step of initializing (A-1) before the step (A), and the step (A-1) may perform memory reservation, read setting parameter reading and variable initialization.

In the step (D), the temperature characteristic may be a linear trend line based on a time series temperature data or a temperature deviation.

The linear trend line can be applied to the trend average of the temperature average per minute of each pixel.

The linear trend line may use a linear regression equation of a linear shape.

In the step (E), when the temperature average value per minute exceeds the linear trendline, the count value is incremented by 1 using the temperature trend analysis. If the count value is equal to or greater than the threshold value n and the temperature change per minute If it is the set temperature Tn, it can be determined as overheating.

In the step (E), the count may not be performed during the set initial first time t1.

In the step (E), if the temperature average value per minute of n is higher than the set temperature Tn above the temperature average value per minute (n-1 minute), it can be determined as overheating.

In the step (E), when the temperature data per minute is equal to or higher than the set critical temperature Tc, it can be determined that the temperature is overheated.

In the step (E), an overheating notification can be performed by using a video or a sound.

In the step (E), the user may overheat the portable terminal.

An overheating measuring apparatus according to an embodiment of the present invention includes a thermal image sensor for measuring temperature data of a target object and a controller for determining whether the object is overheated through temperature data measured by the thermal image sensor.

And an alarm unit for notifying the result of the overheating when the overheat of the object is measured.

The overheat measuring method and the overheat measuring device using the same according to an embodiment of the present invention can detect the overheat by capturing and analyzing the temperature change of the cooking container with the thermal image sensor during the cooking process and interlocking with the alarm unit and the gas circuit breaker Thereby preventing fire accidents due to overheating.

Also, the overheat measuring method and the overheat measuring apparatus using the same according to the embodiment of the present invention can detect the overheat by sensing the temperature change trend and sensing the specific high temperature. And can be detected regardless of the material and shape of the cooking vessel.

1 is a conceptual diagram showing an overheat measuring apparatus according to an embodiment of the present invention.
2A to 2C are flowcharts illustrating a method of measuring an overheating according to an embodiment of the present invention.
FIGS. 3 to 9 are conceptual diagrams illustrating temperature characteristics measured through an overheat measuring method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. In addition, the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the invention. In addition, as used herein, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Furthermore, " comprise "and / or" comprising "as used herein specify the presence of stated steps, operations, elements, elements, numerical values and / But does not preclude the presence or addition of other steps, operations, elements, elements, numerical values and / or groups.

1 is a conceptual diagram showing an overheat measuring apparatus according to an embodiment of the present invention.

The overheat measuring apparatus according to an embodiment of the present invention includes a thermal image sensor 100, a controller (not shown) and an alarm unit (not shown), and measures and detects overheating of a target object (for example, a gas range) do.

The thermal image sensor 100 may measure the temperature of each pixel of a target object, and may be installed on a hood, a wall surface, a ceiling, or the like so as to direct an upper plate of the target object. Thereby, the thermal image sensor 100 can acquire the temperature data of the object, and transmits the temperature data to the control unit (not shown) by wire or wirelessly.

The control unit (not shown) determines whether or not overheating has occurred in the object through the temperature data, and delivers the result of the overheating through an alarm unit (not shown).

FIGs. 2A to 2C are flowcharts illustrating a method of measuring an overheating according to an embodiment of the present invention, and FIGS. 3 to 9 are conceptual diagrams illustrating temperature characteristics measured through an overheat measuring method according to an embodiment of the present invention. to be.

2A through 2C, an overheat measuring method according to an exemplary embodiment of the present invention includes an initialization step S10, a temperature data acquisition step S20, an ROI generation step S30, (S40), a feature extraction step (S50), an overheating determination step (S60), a result output step (S70), and an end processing step (S80).

First, in the initialization step (S10), a memory is reserved, setting parameter reading is performed, and variables are initialized. Reading configuration parameters and initializing variables reads the configuration parameters by calling the initialization function. Here, the setting parameters vary depending on the type of the thermal image sensor 100, such as the width of the image, the height of the image, and the size of the image, and the ROI, the overheat temperature limit Tc, , The cooking temperature and the cooking temperature deviation value can be changed. In addition, variables are composed of one class, and the type of data in the header file and the size required for creating an array are defined.

In the temperature data acquisition step (S20), the temperature data of the object is acquired through the thermal image sensor 100, and the temperature data is transmitted to a control unit (not shown). The measured temperature data have different colors for each pixel as shown in FIG.

In the ROI generation step S30, a controller (not shown) performs an overheating detection only on a pixel at a predetermined temperature T1 or higher among the temperature data measured through the thermal image sensor 100, ROI, Region of Interest).

Accordingly, in the present invention, by applying the overheat detection logic only to pixels having a high probability of occurrence of overheating, the number of operations can be reduced and the system resources can be efficiently used. The generated region of interest is represented by a pixel having an area as shown in FIG.

In the buffer generation step S40, a buffer for storing average temperature data per minute and temperature standard deviation data per second is generated. Here, the basic buffer structure used for overheat detection is defined in the header file as a structure. The one-dimensional array defined by the structure is determined by its size as a variable.

Next, in the feature extraction step S50, a linear trend line based on a time series temperature data and a temperature deviation are used as main features for determining the overheating of the object.

Here, the characteristic of the linear trend line based on the time series temperature data is to observe the temperature change trend with the time axis as the horizontal axis and the temperature value as the vertical axis to find the superheating pattern from the time series temperature data. Here, trend refers to the tendency to continuously increase or decrease over a long period or to maintain a constant state. Since it is difficult to find the trend variation in the time series data for a short time, in one embodiment of the present invention, the trend is obtained by taking an average of the temperature values for one minute. This trend can have a linear, quadratic, or S-shaped trend, where the temperature variation pattern during cooking is constantly increasing or decreasing, so a linear trendline is used. That is, the linear trend line can be expressed as a linear trend equation y = ax + b.

However, in general, in the case of a dish containing water, the temperature of the cooking vessel tends to rise sharply when all the water evaporates. In this case, as described above, the linear trend analysis can be used to detect the overheating. However, in the case of cooking that does not include water, that is, cooking using a frying pan, such a temperature pattern does not appear. Therefore, the temperature deviation value was used to detect the overheating in the case of the cooking of the pans.

Here, FIG. 7 shows a temperature graph of cooking using a dish containing water (for example, a pot) and a frying pan. It can be seen that the temperature difference is large in the cooked food with the pot, but the temperature deviation is small in the frying pan. As a result of analyzing the temperature deviation relationship between the dishes of the frying pan and the cooked pots from about 400 overheating experiments DB, the graph as shown in FIG. 8 can be obtained. As a result, it can be seen that the temperature variation of the frying pan is smaller than that of the pot cooking. Here, the standard deviation of the temperature deviation was obtained per second, and then the average was taken for one minute.

Next, in the overheating determination step (S60), the method (S61) using the temperature trend analysis and the method (S62) for detecting the specific high temperature are used together.

Here, referring to FIG. 5, a graph of temperature change upon overheating of the object (pot) can be confirmed. As the temperature rises in the initial stage of cooking, when the water starts to boil, the rising slope of the temperature becomes gentle. After that, when the water evaporates, the temperature rises sharply. The one-minute average temperature data can be used to detect overheating by finding a pattern that traverses the linear trendline.

Referring to FIG. 2B, the temperature trend analysis method S61 generates average temperature data per minute for each pixel of the object (S61a).

Referring to FIG. 6, since the graph of the average temperature data per minute overtakes the linear trendline during the initial first time t1, it should be ignored.

Of course, if the cooking time is not equal to or longer than the predetermined first time t1 and it is detected that the temperature does not increase, the overheat measurement is terminated.

Thereafter, a linear regression equation is obtained through the average temperature data per minute (S61b). Here, as described above, the linear regression equation can be expressed as y = ax + b.

As described above, it is determined whether the average temperature value per minute is greater than the linear regression value (S61d), and the count value is incremented by one (S61f). Of course, if the average temperature per minute is greater than the linear regression value, the count value is incremented by one again. Otherwise, the count value is initialized to 0 to minimize the influence on the noise (S61e).

Thereafter, when it is determined that the count value is equal to or greater than n and the temperature change per minute is the temperature Tn set in accordance with the count value (S61g), the control unit measures the object as being in an overheated state, An alarm is made or the breaker is operated to directly cut off the supply of the heat source.

Of course, the count value n and the temperature Tn are values in one embodiment, and the values may differ depending on the kind of the image sensor, the installation position, and the like, and thus the present invention is not limited thereto. For example, when the count value n is 2, the temperature Tn may be 6, and when the count value n is 3, the temperature Tn may be 4. That is, as the count value n increases, the temperature Tn may decrease.

As for the method S62 for detecting high temperature, the graph shown in Fig. 9 can be confirmed in the cooking of a frying pan or the like that does not use water as described above. That is, a dish containing water may have a rapid temperature rise from the point of time when the water is evaporated, so that the method using the temperature trend analysis (S61) can be applied. However, in a dish not containing water, It is difficult to apply the method using the temperature trend analysis (S61) because the temperature rises.

2C, the method S62 for detecting a high temperature continuously extracts the maximum temperature of the object S62a. When it is determined that the maximum temperature of the object exceeds the set threshold temperature Tc S262d), the control unit measures the object as being in an overheated state, and performs an alarm through an alarm unit such as voice or image, or operates the breaker to directly cut off the supply of the heat source.

Here, the critical temperature Tc may be defined to be about 200? Considering the boiling point of water. However, since the threshold temperature Tc is a value defined in one embodiment and may vary depending on the performance of the image sensor, But is not limited thereto.

Then, the result output step S70 stores the overheating determination result for each pixel in the variable. If it is determined that the overheating is normal, the overheating result is outputted. Further, as described above, an alarm is performed through the alarm unit or the breaker is operated to directly shut off the supply of the heat source. In the termination processing step S80, the stored memory is released to prepare for the recycling of the overheat measurement.

It is to be understood that the present invention is not limited to the above-described embodiment, and various modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

100; Thermal imaging sensor

Claims (13)

(A) obtaining temperature data for each pixel with a thermal image sensor;
(B) selecting a pixel having a temperature higher than a first temperature (T1) of each pixel in the step (A) to generate a region of interest (ROI);
(C) generating a buffer capable of storing feature data of the region of interest;
(D) extracting a temperature characteristic from the characteristic data;
Determining (E) an overheating of the region of interest; And
And (F) outputting an overheating result when it is determined in the step (E) that the overheat is detected. The method according to claim 1,
Before the step (A)
Further comprising the step of initializing (A-1)
Wherein, in the step (A-1), memory reservation, setting parameter reading, and variable initialization are performed. The method according to claim 1,
In the step (D)
Wherein the temperature characteristic is a linear trend line based on a time series temperature data or a temperature deviation. The method of claim 3,
Wherein the linear trend line applies a temperature average value per minute of each pixel as a trend. 5. The method of claim 4,
Wherein the linear trend line is a linear regression equation. 6. The method of claim 5,
In the step (E), when the temperature average value per minute exceeds the linear trend line using the temperature trend analysis, the count value is increased by 1,
And when the count value is equal to or greater than the threshold value, it is determined to be overheated. The method according to claim 6,
Wherein the step (E) does not count the initial first time (t1). 6. The method of claim 5,
Wherein in the step (E), when the temperature average value per minute of n is higher than the temperature average value of the previous (n-1) minute, the overheating is determined. 6. The method of claim 5,
Wherein in the step (E), when the temperature data per minute is equal to or higher than the preset threshold temperature (Tc), the determination is made as overheating. The method according to claim 1,
Wherein in the step (E), an overheat notification is made by a video or a sound. The method according to claim 1,
Wherein in the step (E), the user's portable terminal is notified of overheating. A thermal image sensor for measuring temperature data of the object; And
And a controller for determining whether or not overheating occurs based on the temperature data measured by the thermal image sensor,
Wherein the controller uses the superheat measuring method according to any one of claims 1 to 9. 13. The method of claim 12,
Further comprising an alarm unit for notifying the result of the overheating when the overheat of the object is measured.

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