JPS635689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display device using a thermography device that can grasp the process of change in temperature distribution.

When diagnosing white wax disease, which has recently been noted as a peripheral circulation disorder caused by vibration, an important deciding factor is how the temperature has recovered after lowering the temperature by soaking the hand in cold water. However, currently, the temperature distribution of the hand is photographed using a thermography device at regular intervals after the hand is taken out of the cold water, and the changes in temperature distribution are compared and judged with the human eye, which is difficult to judge and can lead to misidentification. It was hot.

The present invention has been made in view of this point,
A subject image that can be called a recovery time map that measures the recovery time for many points in the field of view until the temperature of each point recovers from its initial value to a predetermined level, and gives each point a brightness or hue that corresponds to the recovery time. By displaying, you can see which part of the subject will recover faster.
It is an object of the present invention to provide an image display device that is an open version of a thermography device that can immediately determine the recovery process, such as which part is slow in recovery. The present invention will be explained in detail below using the drawings.

The accompanying drawings show the structure of one embodiment of the present invention. In the figure, 1 is an infrared detector, and 2 is a lens for forming a spot image Z of the detector 1 onto a subject 3. Since this detector image spot Z is raster-scanned on the object by the scanner 4, infrared rays emitted from various parts of the object are sequentially incident on the detector 1 during scanning and are detected. The obtained detection signal is sent to a processing circuit 5 including an amplifier, a linearizer, etc.
and is converted into a temperature signal that has a linear relationship with temperature. The obtained temperature signal is sent to the cathode ray tube display device 10 and also to the load data memory 8 or comparator 9 via the A-D converter 6 and switch 7. Since the display device 10 is scanned in synchronization with the scanner based on the horizontal and vertical synchronization signals generated by the scanner 4, the display device 1
The temperature distribution image of the object will be displayed on the screen of 0.

Reference numeral 11 denotes an address generator that divides the field of view into, for example, 200 x 200 points (picture elements) based on the horizontal and vertical scanning signals from the scanner 4, and sequentially generates addresses for specifying each point as the scanning progresses. The address signal from the generator 11 is sent to the memory 8 and also sent to the recovery time memory 13 via the gate circuit 12. Recovery time data from a counter 14 that measures recovery time by counting appropriate clock signals is sent to the memory 13 via a gate circuit 12 and stored for each point.
The stored contents are repeatedly read out by the readout display circuit 15 and displayed on the second cathode ray tube display device 16.

The comparator 9 multiplies the pre-load data read from the memory 8 based on the address signal sent from the generator 11 by a predetermined constant K using the multiplier 17 and the data obtained through the switch 7. The sent temperature signals at the time of recovery time measurement are compared, and if the latter is greater than or equal to the former, a matching signal is generated, and the gate circuit 1
The signal is sent to the AND circuit 18 which controls ON-OFF of 2.
The memory 13 issues a signal for determining whether data is already stored at the address specified by the address signal, and this signal is sent to the AND circuit 1.
8 and protects the data once it is stored.

In the above-described configuration, first, before immersing the hand in cold water, in other words, the temperature distribution pattern of the hand during normal operation is stored in the memory 8. In other words, place your hand in the specified position within the field of view before immersing it in cold water, and turn the scanner 4 with the switch 7 tilted toward the memory 8 side.
One screen is scanned by , and the obtained temperature signal for one screen is decomposed into 200×200 pieces of data, for example, 200 per raster, 200 rasters per screen, and stored in the memory 8.

Next, after soaking your hand in cold water at 10°C for 5 minutes, place it again in the specified position within the visual field, and with the switch 7 tilted toward the comparator 9 side, the scanner 4 scans one screen until the start pulse S is generated. The scanning starts synchronously, and thereafter the scanner 4 repeatedly scans one screen every second, for example. The counter 14 and memory 13 are cleared by the start pulse S, and the counter 14 counts clock pulses CP every second, for example. Therefore, the number of seconds elapsed since the start pulse S is obtained as the output of the counter 14.

On the other hand, the temperature signal obtained as the screen is repeatedly scanned is sent to the comparator 9 via the switch 7, and this comparator receives the previously stored normal temperature signal from the memory 8 on the screen. It is read out sequentially in synchronization with the scanning, multiplied by K by the multiplier 17, and supplied. Therefore, the comparator 9 calculates the temperature of 200 x 200 points on the object which is in the process of recovering from the temperature of the cold water. , the normal temperature at each point is repeatedly compared every second with the value obtained by multiplying it by K. So, for example, K
If it is set to 0.8, the comparator 9 will emit a coincidence pulse when the temperature at each point exceeds 80% of the normal temperature, and the coincidence pulse will be
If the signal is sent to the gate circuit 12 via the AND circuit 18 and the gate circuit is turned ON only at that time, the address signal at that time and the output of the counter 14, that is, the number of seconds elapsed since the start pulse, are sent to the memory 13. The number of seconds required for recovery (recovery time) will be stored at the address of the point at which the temperature has recovered to 80%.

Therefore, for example, in the area from address 1 to address 40000 corresponding to 200 x 200 points in the memory 13,
The recovery times are stored in order from points with good blood circulation and quick recovery, and the measurement ends when the recovery times of all points are stored. And after finishing memory 1
3 reading and displaying recovery time data for each point 1
5 reads sequentially from address 1, for example, recovery time
If the color is divided according to the recovery time, such as white for less than 120 seconds and red for 120 seconds or more and less than 180 seconds, and each point is displayed on the display device 16 in association with its position on the subject, the The screen consists of 200 x 200 points, and each point provides an image of the subject (hand) colored according to its recovery time. Using this image, it is possible to clearly distinguish between areas with good blood circulation and a short recovery time and areas with poor blood circulation and a long recovery time, and it becomes obvious at a glance in which areas the disorder is most pronounced.

It goes without saying that instead of displaying the information by color, it may be displayed by changing the brightness.
Further, in the above-described embodiment, the recovery time of the hand was measured, but it is not limited to the hand, but any object whose temperature changes over time can be measured. Further, the value of K is not limited to 0.8, but may be set to an appropriate value; for example, when measuring the temperature of an object after it is heated until it cools down to around room temperature, it will be set to a value larger than 1, such as 1.2 or 1.5.

Furthermore, in the above example, the value of 80% of the normal temperature and the temperature in the recovery process were compared for each point, but the comparison is not limited to this, and it is also possible to compare all points with the same temperature level, for example, 30°. well,
In that case, switch 7, memory 8 and multiplier 1
7 is no longer necessary, and a 30° temperature signal can be supplied to the comparator 9 from a suitable constant generator.

[Brief explanation of the drawing]

The accompanying drawings are diagrams showing the configuration of an embodiment of the present invention. 1: Infrared detector, 3: Subject, 4: Scanner, 8, 13: Memory, 9: Comparator, 16: Cathode ray tube display, 11: Address generator, 12: Gate circuit, 14: Counter, 15: Readout Display circuit, 17: Multiplier.

Claims (1)

[Claims] 1. A thermography device that repeatedly acquires temperature information of picture elements constituting a visual field, a means for generating predetermined reference temperature information for each picture element, and a means for generating predetermined reference temperature information for each picture element that is repeatedly obtained. a comparison means for comparing with temperature information; a timekeeping means for determining the time required for each picture element from the measurement start time until the temperature of each picture element reaches a reference temperature based on the comparison result by the comparison means; and the timekeeping means. 1. An image display device using a thermography device, characterized in that it is comprised of a display means for displaying an image of a field of view with brightness or hue given according to the time required for each picture element based on the output of the image element.