JPS643262Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television signal converter for infrared video signals.

For example, a system that displays the temperature distribution of an object to be inspected on a display screen uses conventional multi-element infrared detectors to image infrared rays through an optical scanner, amplifies the output from each detector, and then displays an LED. Convert it into a visible image using a light emitting device such as
Furthermore, a method was used in which the visible image was captured by a television camera and displayed on a television display screen. However, this type of conventional method requires a conversion means such as a light emitting element and a television camera, and has problems in that the conversion ratio is poor and the system becomes larger and costs increase.

Accordingly, an object of the present invention is to propose a television signal converter for infrared video signals, which enables processing entirely by electric signals without using the light emitting element-television camera conversion means.

In accordance with the above object, the present invention is such that an optical scanner that obtains an infrared image signal from an object to be inspected and a multi-element infrared detector cooperate with each other to capture an image using an interlaced method. The infrared video signals are amplified, multiplexed by a multiplexer, converted into analog/digital, and the digitized infrared video signals are alternately written into two field memories and alternately at complementary timing. The device is characterized in that the readout signal is read out, sequentially digital/analog converted, and then supplied to a television receiver while adding horizontal and vertical synchronizing signals in the middle.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram showing an example of a circuit based on the present invention. In this figure, T is an object to be inspected, and an infrared image is displayed on a television receiver TV, for example, in order to investigate its temperature distribution. First, the optical scanner 11 receives the infrared image from the object to be inspected T and sequentially supplies it to the multi-element infrared detector 14. The number of these detectors 14 usually ranges from several tens to several hundreds. The optical system scanner 11 has a lens system 12 and a scan mirror 13, and the scan mirror 13 is deflected by a drive mechanism (not shown).
An infrared image is distributed and scanned in the range W in the figure. This scanning needs to be based on an interlaced method, taking into consideration the television receiver TV placed at the subsequent stage.
Interlace method refers to ODD field and
When each field of the EVEN field is sequentially scanned, an image consisting of one frame is obtained.
This is a typical television scan. If this interlacing method is applied to this infrared imaging system and considered, the result will be as shown in FIG. In FIG. 2, numeral 14 is the multi-element infrared detector described above, and a large number of them are arranged in a horizontal row. These infrared detectors 14 and the optical system scanner 11 mentioned above cooperate, and the area 21
Scan the inside as shown. Note that the area 21 corresponds one-to-one with the display screen of the television receiver TV. First, the ODD field is scanned as ODD, ODD...ODD in the figure, and then the EVEN field is scanned as EVEN... in the figure.
EVEN is scanned, and all these fields form one frame screen. Here, each field corresponds to one horizontal scan line in the television receiver. Switching the scan of each field, i.e.
Switching from ODD to EVEN or from EVEN to ODD is performed by applying deflection to the scan mirror 13 in the optical system scanner 11.

Returning to FIG. 1 again, the video signals from each infrared detector 14 are amplified by the corresponding amplifiers 15 and multiplexed by the multiplexer 16. The signal from multiplexer 16 is passed through buffer amplifier 17 and then digitized by analog/digital converter 18. This digitized video signal is stored in two field memories 19-1 and 19-2. When field memory 19-2 is being read, data is written to field memory 19-1, and conversely, while field memory 19-1 is being read, data is written to field memory 19-2. This is to perform reading sequentially and continuously. The signal read out from the field memory 19-1 or 19-2 is sent to the digital/analog converter 21 via the OR gate 20.
Here, it is converted into an analog signal suitable for the television receiver TV, and is supplied to the television receiver TV as an analog signal for each horizontal scan, with horizontal and vertical synchronization signals added in between.

As explained above, according to the present invention, there is no need for conventional conversion means such as light emitting elements and television cameras, and all conversion processing is performed using electrical signals, resulting in high conversion efficiency and a compact system. Moreover, since all the electric circuits used can be obtained at low cost, it also leads to cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a circuit based on the present invention, and FIG. 2 is a pattern diagram for explaining scanning by the interlace method. In the figure, 11 is an optical scanner, 14 is an infrared detector, 15 is an amplifier, 16 is a multiplexer, 17 is a buffer amplifier, 18 is an analog/digital converter, 19-1 and 19-2 are field memories, and 24 is a digital /Analog converter, T is the object to be inspected, and TV is a television receiver.

Claims (1)

[Claims for Utility Model Registration] A system for receiving an infrared image from an object to be inspected and displaying it on a television receiver, in which an optical scanner and a multi-element infrared detector cooperate with each other to obtain an infrared image from the object to be inspected. An infrared video signal is obtained, the infrared video signals from each of the multi-element infrared detectors are amplified, multiplexed by a multiplexer, analog/digital converted, and then digitized into two field memories. Infrared video signals are written alternately and read out at complementary timing,
In a system that performs the above-mentioned display by sequentially converting the readout signal from digital to analog, the optical system scanner and the multi-element infrared detector cooperate with each other to perform imaging in an interlaced manner, The digitized infrared video signal corresponding to the ODD field and the digitized infrared video signal corresponding to the EVEN field are respectively written into the field memory, and further read out from these two field memories and sequentially converted into digital/analog data. The converted readout signal is
A television signal conversion device for an infrared video signal, characterized in that an analog signal for each horizontal scan is supplied to the television receiver while adding horizontal and vertical synchronizing signals in between.