JPH0219875Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a graph display method for time-series image data suitable for use in understanding temperature changes over time at any part of an object to be measured. In particular, the present invention relates to a graph display device for time-series image data that allows direct reading of temperature changes of an object to be measured by superimposing and displaying temperature difference waveforms.

[Conventional technology]

FIGS. 4 and 5 are diagrams for explaining conventional display screens of thermography apparatuses.

A thermography device is known as a device that obtains a temperature distribution image of a measurement target. This thermography device scans and focuses infrared rays emitted from an object to be measured and detects them with an infrared detector, and sends the obtained infrared image signal directly or via an image memory to a display device. As shown in Figure 4, a temperature distribution image Z is displayed. In FIG. 4, HC and VC are movable horizontal and vertical cursors, respectively, and in this display device, the temperature along the horizontal cursor HC is displayed below the image Z as a waveform W _h , and also at the vertical cursor VC. The temperatures along the line are displayed as waveforms _Wv on the left side of the image Z, and the temperature value at the intersection point CP of this cursor is sampled, and the temperature value is displayed above the image Z as a numerical value. Since this image Z is rewritten every time the screen is scanned, for example, once every second, temperature changes can be ascertained by monitoring the temperature value at the cursor intersection point CP.

When actually trying to memorize the temporal change in the temperature value at the cursor intersection point CP, as proposed in Japanese Patent Application Laid-Open No. 59-75785 (Japanese Patent Application No. 186917-1983), it is necessary to It is conceivable to display the temperature value numerically. Furthermore, although the present inventor previously proposed and filed a separate application, it is also an effective method to display temperature changes at arbitrary positions in the temperature distribution image as a graph as shown in FIG.

[Problem that the invention attempts to solve]

However, such a display is inconvenient since it is possible to know only the temperature change at one point, and it is not possible to know what kind of temperature change is occurring at other points. Now, if we consider the case of investigating the temperature change of one IC, the temperature change of the IC is not uniform over the entire IC, but there is a temperature gradient, so
There arises a demand to know the relative relationship between which locations and how the temperature changes over time. However, in the conventional example as described above, it is not possible to meet such demands because it is possible to know only the temperature change at each point.

The present invention is based on the above-mentioned invention, and
It is an object of the present invention to provide a graph display device for time-series image data that allows direct reading of temporal temperature changes in any line of an object to be measured.

[Means for solving problems]

To this end, the thermography time-series data graph display device of the present invention includes an image memory that stores a plurality of temperature distribution image data, a readout means that reads out the temperature distribution image data of a designated observation line from the image memory, and a designated holding means for holding temperature distribution image data of the observed observation line; calculation means for subtracting the temperature distribution image data held in the holding means from the temperature distribution image data read out by the reading means;
and display data generation means for generating graph display data from the output of the calculation means, and stores a plurality of time-series temperature distribution image data in an image memory by repeatedly scanning the measurement object two-dimensionally at regular time intervals. The temperature distribution image data of the first observation line is held in the holding means over time, and the reading means reads each temperature distribution image data of the specified observation line from the image memory, and the calculation means reads out the temperature distribution image data of the holding means. The method is characterized in that the difference between the temperature value and the temperature value of the observation line is calculated, and the change over time in the temperature value of the observation line is displayed graphically through the display data generating means.

[Effect]

The thermography time-series data graph display device of the present invention retains temperature distribution image data of the first observation line over time, reads out each temperature distribution image data of a specified observation line from the image memory, and displays them. Since the difference is calculated and the change over time in the temperature value of the observation line is displayed graphically, the change in temperature value from the start can be immediately compared and observed at each point on the observation line. In addition, two-dimensional temperature distribution image data is stored in chronological order and displayed superimposed on the specified observation line, so you can simply change the specified observation line and graph the same time period without remeasuring. Can be displayed.

(Example) Examples will be described below with reference to the drawings.

Fig. 1 is a block configuration diagram of a thermography apparatus for explaining one embodiment of the present invention, Fig. 2 is a diagram for explaining the storage area of the memory, and Fig. 3 is a diagram for explaining the graph display memory. 1 is a diagram for explaining writing of a pattern, 1 is a camera section, 2 is a diagram for explaining writing of a pattern;
is an A/D converter, 3 is a changeover switch, 4 is a write circuit, 5 is an image memory, 6 is a readout circuit, 7 is a synthesis circuit, 8 is a changeover switch, 9 is a display device, 10
1 is a cursor memory, 11 is a cursor position designation circuit, 12 is a cursor write circuit, 13 is a read circuit, 14 is an image memory section, 15 is a write circuit, 1
6 is a readout circuit, 17 is a changeover switch, 18 is a coordinate conversion circuit, 19 is a write circuit, 22 is a memory write circuit, 23 and 24 are 1-line data memories,
25 indicates a subtraction circuit.

In FIG. 1, a camera unit 1 two-dimensionally scans and condenses infrared rays emitted from an object to be measured, and detects the infrared rays to obtain an infrared image signal. For example, 1 pixel 8 in device 2
The signal is converted into a bit digital signal and stored in the image memory 5 via the changeover switch 3 and the write circuit 4.
The image memory 5 has a capacity of 256 lines, 256 pixels per line, and 8 bits per pixel as shown in FIG. It is stored in the corresponding position in the memory area with dynamic cleansing. This data is sequentially rewritten with new data, for example, once every second in accordance with pixel scanning by the camera section 1. cursor memory 10
As shown in Figure 2b, the cursor position designation circuit 1 has 256 x 256 pixels and a capacity of 1 bit per pixel.
Based on the horizontal and vertical cursor display position data designated by 1, the cursor writing circuit 12 writes a cursor pattern consisting of a horizontal cursor HC and a vertical cursor VC.

The image data and cursor pattern written in the image memory 5 and the cursor memory 10 are simultaneously read out by readout circuits 6 and 13, respectively, in synchronization with screen scanning of the display device 9, and are synthesized by a synthesis circuit 7. Therefore, the changeover switch 8 is connected to the synthesis circuit 7.
If the temperature distribution image Z, horizontal cursor HC, and vertical cursor VC as shown in FIG. In addition, horizontal waveform, vertical waveform, and cursor intersection
The configuration for displaying the temperature value of CP is omitted because it is not directly related to the present invention.

The temperature distribution image displayed on the display device 9 is rewritten every pixel scan of the camera unit 1 once per second, but the writing circuit 15 is rewritten at a time interval specified by the operator, for example, 10 seconds. The image memory unit 1 stores one screen worth of time-series temperature distribution image data one after another.
Write it down to 4. Therefore, as shown in FIG _.
Z ₁₀ , image memory section 1
4 will store 10 temperature distribution images taken at 10 second intervals. Note that the image memory section 14
The memory capacity of each of the image memories Z ₁ to _{Z 10} is the same as that of the image memory 5.

After measuring for 100 seconds in this way, the changeover switch 3 is connected to the image memory section 14 side, and the changeover switch 17 is connected to the image memory 5 side, and the operator specifies, for example, the first temperature distribution image _Z1 . Then, the readout circuit 6 reads out the data stored in the image memory _Z1 and switches the changeover switch 1.
7, 3 and the write circuit 4 to store it in the image memory 5. As a result, the display device 9 displays this image Z ₁
is displayed continuously. As described above, at this time, the horizontal and vertical cursor patterns HC and VC are displayed in a superimposed manner.

Next, an example of a graph display according to the present invention will be explained. In this case, the changeover switch 17 is connected to the 1-line data memory 23 side, and the changeover switch 8 is connected to the graph display memory 20 side. In this state, the readout circuit 16 first selects the 256 pixels located at the horizontal cursor position in the first temperature distribution image _Z1 stored in the image memory section 14 based on the horizontal cursor position designation signal from the cursor position designation circuit 11. (For convenience, the temperature data of these 256 pixels will be referred to as H ₁ below.)
The data is stored in the line data memory 23. Next, the changeover switch 17 is connected to the data memory 24 side, and the reading circuit 16 reads out the same temperature data H ₁ and stores it in the 1-line data memory 24 . The subtraction circuit 25 subtracts the temperature value data of each pixel stored in the 1-line data memory 23 from the temperature value data of each pixel stored in the 1-line data memory 24 for each corresponding position. There is H ₁
-H ₁ is sent to the coordinate conversion circuit 18. When this process is completed, the readout circuit 16 further reads out the temperature data H ₂ of 256 pixels located at the horizontal cursor position in the second temperature distribution image Z ₂ and stores it in the 1-line data memory 24 . Then, the subtraction circuit 25
calculates H ₂ −H ₁ as before and sends the result to the coordinate conversion circuit 18.

By repeating the above process until the final temperature distribution image Z ₁₀ , 10 pieces of data H ₁ −H ₁ , H ₂ −H ₁ , each consisting of 256 pieces of temperature difference data are obtained.
H ₃ −H ₁ , H ₉ −H ₁ , H ₁₀ −H ₁ are obtained. These 10 pieces of data are written into the graph display memory 20 via the coordinate conversion circuit 18 and the write circuit 19. In the graph display memory 20, a graph pattern as shown in FIG. 3a is written in advance, with the horizontal axis representing the position and the vertical axis representing the temperature difference. As mentioned above, each of the 10 pieces of data includes 256 pieces of temperature difference data. Each of these temperature difference data is given a horizontal axis position corresponding to each value, and is written to the graph display memory 20 as 256 bright spots separated for a certain period of time in the horizontal axis direction, but this alone makes it difficult to see. In this case, the lines connecting the bright spots are also drawn at the same time. In this way, one piece of data, for example _H2 - _H1, is displayed graphically. In this process, the coordinate conversion circuit 18 plays the role of converting each temperature difference data value into position data in the vertical axis direction.

This process is performed on all 10 data H ₁ − H ₁ , H ₂ −
Ten graphs can be written in the graph display memory 20 by performing the steps for H ₁ , H ₃ −H ₁ , . . . H ₉ −H ₁₀ . Note that the scale on the vertical axis in FIG.
The temperature is written in the horizontal axis direction of the graph pattern based on TW (information such as upper limit temperature, lower limit temperature, or lower limit temperature and temperature range). Information regarding this scale may be specified by the operator, but it is stored in the image memory unit 14 together with the image data during measurement, and when displaying a graph, it is read out separately from the image data using the readout circuit 16 and written on the scale. It may also be supplied to the circuit 22.

The graph pattern in which each piece of information has been written in this way is read out by the readout circuit 21 in synchronization with the screen scanning of the display device 9, and the changeover switch 8
Since the data is sent to the display device 9 via the display device 9, a graph as shown in FIG. 3b is displayed on the screen. In such a graph display, if each graph is displayed in different colors, such as the H ₂ − H ₁ graph in red and the H ₃ − H ₁ graph in yellow, you can see how the temperature changes over time. You can know more clearly than Tsutaka.

Further, although the above example has been explained for horizontal lines, it goes without saying that a similar graph display can be performed for vertical lines as well.

[Effect of idea]

As is clear from the above explanation, according to the present invention, multiple pieces of temperature distribution image data are stored in chronological order, and the changes over time of a designated line are displayed in a superimposed manner, so the designated line can be changed. Changes over time can be observed on other lines without having to reinstall them. In addition, since the first data is subtracted from each time-series data and superimposed on the same coordinates, it is possible to immediately grasp changes over time from the start of a specified line, and to identify points on the line where changes are rapid or gradual. The points can be easily distinguished.

[Brief explanation of drawings]

Fig. 1 is a block configuration diagram of a thermography device for explaining one implementation of the present invention, Fig. 2 is a diagram for explaining a scale storage area, and Fig. 3 is a diagram for explaining a graph pattern in a graph display memory. FIGS. 4 and 5 are diagrams for explaining the conventional display screen of a thermography apparatus. 1...Camera unit, 2...A/D converter, 3,
8, 17... changeover switch, 4, 15, 19...
Writing circuit, 5... Image memory, 6, 13, 16
... Read circuit, 7 ... Synthesis circuit, 9 ... Display device, 10 ... Cursor memory, 11 ... Cursor position designation circuit, 12 ... Cursor write circuit, 1
4... Image memory section, 18... Coordinate conversion circuit, 2
2...Memory write circuit, 23, 24...1 line data memory, 25...Subtraction circuit.

Claims (1)

[Scope of utility model registration request] The object to be measured is scanned two-dimensionally to detect infrared rays emitted from the object, the temperature distribution image data of the object to be measured is displayed, the observation line of the object to be measured is specified, and the temperature of the observation line is determined. It is a time series data graph display device for thermography that displays graphs of changes in values over time.It is an image memory that stores multiple sheets of temperature distribution image data, and a temperature distribution image data of a specified observation line from the image memory. a readout means for reading out, a holding means for holding the temperature distribution image data of the specified observation line, an arithmetic means for subtracting the temperature distribution image data held in the holding means from the temperature distribution image data read out by the reading means;
and display data generation means for generating graph display data from the output of the calculation means, and stores a plurality of time-series temperature distribution image data in an image memory by repeatedly scanning the measurement object two-dimensionally at regular time intervals. The temperature distribution image data of the first observation line is held in the holding means over time, and the reading means reads each temperature distribution image data of the specified observation line from the image memory, and the calculation means reads out the temperature distribution image data of the holding means. 1. A time-series data graph display device for thermography, characterized in that the difference between the data and the data is calculated, and the temporal change in the temperature value of the observation line is displayed graphically through a display data generating means.