Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-06-29
1986-08-26
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 81, 358108, H04N 718
Patent
active
046085971
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of monitoring a target space.
It is known that target spaces can be monitored by means of TV cameras sensitive to infrared (IR) radiation. This produces an image that is in accordance with the temperature differences and emission characteristics of the target space. In general, an image of this kind displays little contrast and is only moderately sharp. Small changes in the target space under surveillance are thus frequently missed by an observer.
It is an object of the present invention to provide a method which does not have these disadvantages, that is to say, in which even slight changes in the space under surveillance will be made distinct.
According to the present invention there is provided a method of monitoring a target space, comprising projecting thermal infrared radiation of the target space by means of an infrared lens on to at least one infrared sensitive detector, forming an electrical signal sequence by constant scanning, and passing this signal sequence in a specific colour directly to a colour TV monitor and delayed and in another colour to the same monitor as an image of the object.
In general, the objects in the target space differ from each other not only by different temperatures, but also in the different emission coefficients of their materials. Thus, it is advantageous to project the target space on two detectors having spectral sensitivity characteristics that differ from each other, one of these detectors being sensitive to IR radiation, and then repeatedly to scan the images so produced so as to form two signal sequences, and subsequently to transmit one of these signal sequences directly and in a specific colour, the other delayed and in another colour, to a TV monitor.
In this connection, in order to render moving objects more distinct by means of a coloured outline, it is also advantageous if one transmits at least one of these signal sequences both directly and in a specific colour, as well as delayed, to a TV monitor.
It is advantageous to project the target space on at least one point, line or image-operating detector so that it is point, line or image filtered and to scan it in such a manner that point, line or image signal sequences result that correspond to two images having spectral sensitivity characteristics that differ from each other.
In order that the signal can be further processed by TV type systems that are commonly available it is desirable that TV type scanning be used, and at least one unit of line time.
In order to produce a stable image it is advantageous that a signal is displayed delayed by several units of line time.
In order that slow changes in the target space are rendered distinct it is further advantageous that a signal be displayed delayed by several half-image or image times.
The present invention will be described in more detail by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic representation of a first embodiment for carrying out the method according to the present invention;
FIG. 2 is a schematic representation of a second embodiment for carrying out the method according to the present invention.
FIG. 3 is a schematic representation of a third embodiment for carrying out the method according to the present invention; and
FIGS. 4 to 9 represent various combinations of IR sensitive detector with the associated scanning systems and possible filtering and picture sectioning systems.
As can be seen from FIG. 1, the target space 1 is projected onto a display screen 3 by means of an IR lens 2. The display screen 3 is scanned repeatedly by line and by image in the manner of a TV, by means of a scanning system 4 so as to produce a signal sequence 5. The signal sequence 5 corresponds to a conversion of the geometrical image information into time information.
The time information 5 is transmitted, on the one hand, directly, and on the other hand through a delay circuit 6 to a two-colour TV monitor 7.
In this regard, a stable image 1 is reproduced in that the sign
REFERENCES:
patent: 3258529 (1966-06-01), Parrish
patent: 3475608 (1969-10-01), Pardes
patent: 4086616 (1978-04-01), Catano
patent: 4343020 (1982-08-01), Stapleton
Britton Howard W.
GX-Holding AG
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