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Method and apparatus for measuring dimensions

  • US 4,173,788 A
  • Filed: 09/26/1977
  • Issued: 11/06/1979
  • Est. Priority Date: 09/27/1976
  • Status: Expired due to Term
First Claim
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1. Structure comprising:

  • means for producing one measure of a field of view without an object present and for producing another measure of the field of view with an object present, said means for producing comprising;

    photosensitive array means for receiving light representing the field of view without an object present and for producing from said light one set of intermediate signals representative of said field of view without an object present, said one set of intermediate signals comprising said one measure, and for receiving light representing the field of view with an object present and for producing from said light another set of intermediate signals representing said field of view with said object present, said another set of intermediate signals comprising said another measure;

    means for controlling said photosensitive array means to produce in sequence said one set of intermediate signals and said another set of intermediate signals; and

    means for converting said one set and said another set of intermediate signals produced by said photosensitive array means to one set and another set of digital code words respectively,means for storing either said one set of digital code words representing said field of view without said object present, or said another set of digital code words representing said field of view with said object present, whichever set of digital code words is produced first in time;

    means for processing said one set of digital code words and said another set of digital code words to produce an intermediate set of digital code words indicative of the change of the field of view between the time of producing said one measure and the time of producing said another measure, wherein said intermediate set of digital code words is also indicative of selected characteristics of said object;

    means for storing said intermediate set of digital code words;

    means for processing said intermediate set of digital code words to obtain a measure of a selected characteristic of said object in said field of view;

    means for deriving from either said one set of digital code words or said another set of digital code words, whichever is produced first in time, and said intermediate set of digital code words, both an indication of the presence or absence of an object at a selected time, and a selected dimension of said object; and

    means for displaying said selected dimension of said object.

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