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Seismographic data color display
| Details |
Inventors: Lambright, Orbie N.; Thapar, Mangat R.;
Assignee: Cities Service Company (Tulsa, OK)
Primary Examiner: Moskowitz; Nelson
Assistant Examiner:
Attorney, Agent or Firm: Traut; Donald L., Benjamin; Walter M.
A new and improved method of forming a color graphic display from seismographic input data is disclosed. The input data sequence is processed to obtain the absolute value of each amplitude value and to select the maximum amplitude value of each oscillation of the waveform. A predetermined number of the largest selected values are classified into a first range of values, the remaining values are scaled according to magnitude into a preset number of ranges and an assignment table is formed with each range being represented by a primary or secondary color. Data corresponding to a first group of ranges of input data is processed to form a representation for a particular color. Similarly, the remaining data groups, corresponding to the remaining ranges, are processed to form a representation of the remaining colors. The image of each representation is sequentially transferred to a sheet and the images are colored with their respective colors, thus producing a color display of the seismic data. |
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DETAILED DESCRIPTION OF THE INVENTION The method of the invention for the formation of color displays from input data is exemplified in FIG.
1 of the drawing, a flow diagram which is described in detail as follows.
Sequences of input data representing different physical measurements as waveforms are recorded from well known field instruments and techniques.
The measurements are taken as a function of time.
FIG.
2 illustrates a variable function of waveform 11.
The input data is recorded on a tape 12 in the conventional manner, from which the data may be called out on demand.
A sequence of input data points 13, 14, 16 and 17 of FIG.
2 representing one function is called out from tape 12 and suitably processed to obtain a sequence of absolute values represented as waveform 18 in FIG.
3.
The sequence of absolute values is stored in a working memory 19.
The sequence of absolute values is then processed to select the maximum values, points 21-24 of FIG.
3, which correspond to the maximum amplitude of each oscillation of the waveform 18.
The sequence of selected maximum values is stored in working memory 26.
The sequence of selected maximum values is then drawn out of storage 26 and processed to classify a predetermined number of the largest selected values into a first range of values.
The remaining values are scaled according to magnitude into five additional ranges in decending magnitude from the first range.
Each range is designated a primary or secondary color, i.
e.
a complement of the primary color, to form a color assignment table 27.
The ranges are stored in working memory 28.
The primary colors include cyan, magenta and yellow.
The secondary colors for a six color display would include red, violet and green.
A sequence of selected maximum absolute values falling within ranges which correspond to a first primary color, for this example, cyan, are drawn out of memory 28.
The ranges having colors which would correspond to the primary color cyan in a six color display would be cyan, red and violet
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Graphic Cards 
