Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-10-02
1992-02-04
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 30, 358 39, 358 80, H04N 977
Patent
active
050863398
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a video system for the detection and indication of the position coloured areas on a picture surface with a black/white patterned background. The invention particularly concerns a video system for digitalising of interpreted seismic sections.
In certain cases, there is an interest for processing information which occurs as coloured lines, dots or patches on a black/white patterned background. An example of such information material is so-called interpreted seismic sections. During the interpretation of seismic sections, interesting structures are marked by hand with for instance, coloured pencils. If this type of material is to be stored in or treated by electronic data systems, the information must be registered in the data systems with the help of, for instance, digitalising tablets. This work is both time-consuming and monotonous.
The system for digitalising of information which presents itself as dots, lines and patches, based on the use of video and digital technique is known. However, conventional video-digitalising systems have turned out to be of no use in cases as described above, where the colour signals have to be received from a closely patterned black and white background.
One of the aims of the invention is therefore to provide a system which, in a simple manner, makes it possible to determine the position of coloured patches on a black/white background by using video technique. In FIG. 1 an example is shown where information is presented in this way, the figure representing an interpreted seismic section. The interpretation of such sections is carried out manually, by indicating directly on the section different structures by colouring, for instance with coloured pencils. In FIG. 1 the coloured areas (c1, c2) are marked with broken lines. The colours in areas can be identical or different.
Black/white and colour information in such material, for instance interpreted seismic sections, can be captured by a video colour camera. In order to specify the colour information in a video signal from a video colour camera, use is often made of the "CIE" diagram, as shown in FIG. 2. ("CIE": Commission Internationale de l'Eclairage). According to this diagram different colours can be represented by a vector centered around white, with co-ordinates x=0.310, y=0.316. The phase angle of this vector specifies the colour, and the distance from the centre indicates colours such as primary colours, and by mixing these, most of the colours represented in the diagram can be created. In standard video systems, the following colours are utilized as primary colours:
______________________________________ co-ordinates in
primary colour
wave length
the "CIE" diagram
______________________________________
red 610 mm x = 0.67 y = 0.33
green 535 mm x = 0.21 y = 0.71
blue 470 mm x = 0.14 y = 0.88
______________________________________
the primary colours in the signal. A point with the co-ordinates x=0.30,
y=0.16 (white) will thus be perceived as black, grey or white according to
the intensity of the components of the primary colours. For the purpose of
representing the luminance in a colour signal, the "CIE" diagram may be
conceived as a three-dimensional co-ordinate system in which the intensity
of the colour signal is represented as the third co-ordinate axis.
If a video camera is used to record an object, for example a flat surface wherein a substantial amount of the colour information exists as a relatively finely masked black and white pattern, the luminance signal will fluctuate rapidly during scanning of the image according to the changes between black and white surfaces on the object. In a video signal from a video camera recording such an object, the signal intensity of each primary colour will change at a rapid rate from a very low value, corresponding to black, and towards a maximum value, corresponding to white. In the "CIE"diagram in FIG. 2 this corresponds to a condition in which the vector components of each primary colour in relation to the locus for
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Den Norske Stats Oljeselskap A.S.
Groody James J.
Vu Kim Yen
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