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Method and means for measuring substance volumes in light-transmitting samples

  • US 4,047,205 A
  • Filed: 04/07/1976
  • Issued: 09/06/1977
  • Est. Priority Date: 04/09/1975
  • Status: Expired due to Term
First Claim
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1. In the method of measuring substance volumes in light-transmitting objects through electronic-image analysis within a field of raster-scanned subject matter, in which each scanning line lying within the boundaries of an object to be evaluated supplies by means of a discriminator a binary signal corresponding to the line length between object-boundary intercepts for the particular line, the improvement which comprises subjecting at least the object region of the field to a first frame of raster scanning at a first amplitude level of video-signal discrimination throughout said first frame scan, integrating the discriminator output signal for all scan lines between the object-boundary intercepts of said lines for said first frame, thereby developing a first integrated-frame value corresponding to the total area of the scanned object;

  • subjecting said region to a second frame of raster scanning at a second amplitude level of video-signal discrimination throughout the second frame scan, integrating the discriminator-output signal for all scan lines between the object-boundary intercepts of said lines for said second frame, thereby developing a second integrated-frame value which corresponds to an object-scanned area that is less than said total area;

    developing a difference signal corresponding to the difference between said values, whereby said difference signal corresponds to the ring-like incremental area between said total area and said lesser area;

    multiplying said difference signal by a calibrating value which relates light-transmittance of said first ring-shaped incremental area with volume of the substance; and

    repeating such frame scans at successive different levels of discrimination with accompanying integration and difference-signal development and calibrating multiplication, for each of the resulting lesser ring-shaped incremental areas involved until no such incremental areas are applicable; and

    then adding the calibration-corrected values.

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