JPH0134097Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermography device, and more particularly to a device capable of correcting image inversion when using an auxiliary mirror.

For example, when photographing a temperature distribution image of a hand using a thermography device, the device is relatively large and there is a dewar that cools the infrared detector, so the device cannot be tilted significantly, so it is difficult to tilt the device as shown in Figure 1. An auxiliary mirror M is placed in front of the device T to take pictures. However, when an auxiliary mirror is used in this way, the left and right or top and bottom sides of the image are reversed, so in the past, it was necessary to include a disclaimer in the photograph, such as ``The left and right sides have been reversed due to the use of a mirror.''

This invention was made in view of this point,
A means for detecting that the auxiliary mirror is inserted into the optical path is provided, and a normal image is obtained by reversing the horizontal scanning direction or vertical scanning direction of the display means based on a detection signal from the detection means. The purpose is to provide a device that can do this. The present invention will be explained in detail below using the drawings.

FIG. 2 shows a block diagram showing the configuration of an embodiment of the present invention, in which numeral 1 denotes a camera section of a thermography device including an optical scanner and an infrared detector, and the horizontal and vertical field of view of the camera section. The infrared video signal obtained by scanning is sent to a cathode ray tube display device 4 via an amplifier 2 and a processing circuit 3 such as a linearizer. The display device 4 is supplied with horizontal and vertical scanning signals SH and SV generated by a scanning circuit 5 based on horizontal and vertical synchronizing signals DH and DV generated in synchronization with horizontal and vertical scanning in the camera section. By switching the switch 6, the vertical scanning signal SV can be inverted by the inverting circuit 7 and supplied.

An auxiliary mirror 9 is attached to the hood 8 of the camera section 1, and a switch 10 is turned on when the mirror 9 is attached. Reference numeral 11 denotes a discrimination circuit for discriminating whether the switch 10 is ON or OFF, and the switch 6 is turned to the inverting circuit 7 side based on the obtained discrimination signal.

Therefore, if the configuration is as described above, the auxiliary mirror 9
Vertical scanning signal sent to display device 4 when installed
Since the SV is inverted and the normal vertical scan from top to bottom is reversed from bottom to top, in the past without inversion, the right hand R and left hand L were displayed oppositely, as shown in Figure 2b. As shown in figure a, an object has a normal left-right relationship when it is flipped upside down.

If you use an auxiliary mirror, the reflectance of the mirror will increase.
The video signal will be weakened by the amount that is missing from 100%, and a corresponding error will occur, but if you send the discrimination signal to, for example, an amplifier and adjust the gain only when a mirror is used, as shown by the broken line in Figure 2. , errors can be eliminated.

Further, in the above-described embodiment, the vertical scanning of the display device is inverted, but it goes without saying that the same correction can be made even if the horizontal scanning is inverted.

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining the auxiliary mirror, Figure 2 is a diagram for explaining the auxiliary mirror.
The figure is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 3 is a diagram for explaining image inversion. 1: Camera section, 4: Display device, 5: Scanning circuit,
6, 10: switch, 7: inverting circuit, 9: auxiliary mirror, 11: discrimination circuit.

Claims (1)

[Scope of utility model registration request] The field of view is scanned horizontally and vertically to detect infrared rays emitted from the field of view, and the obtained infrared image signal is supplied to a display means that is scanned horizontally and vertically in synchronization with the horizontal and vertical scanning of the field of view to produce an infrared image. In the thermography apparatus, a means for determining whether an auxiliary mirror is inserted into the optical path is provided, and the horizontal scanning direction or the vertical scanning direction of the display means is determined based on a determination signal from the determining means. A thermography device characterized in that one of the elements is reversed.