Method for increasing contrast between an object and space when

Details Method for increasing contrast between an object and space when Method for increasing contrast between an object and space when

1985-01-23

1987-02-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358110, 356237, 356240, 250223B, 2503581, 350 11, H04N 718, H04N 530

Patent

active

046411879

ABSTRACT:
A method of increasing the contrast when photographing a transparent object, such as a glass object through the use of a television camera, is provided. The transparent object is illuminated with radiation in a region of the spectrum to which the transparent object is impermeable. A filter which suppresses the radiation in the region of the spectrum to which the transparent object is permeable and transmits radiation in the region of the spectrum to which the transparent object is impermeable is used between the light source and the transparent object. An electronic pick-up camera which is sensitive, i.e., capable of detecting radiation, in the region of the spectrum to which the filter is permeable, is used for taking photographs of the object. In contrast to known processes in which the transparent objects appear dark only at certain edge regions or other points of marked curvature, an object which appears transparent to the eye is thus represented in completely opaque fashion, in accordance with this method, so that the geometric dimensions of the transparent object can be determined automatically and can be compared with a prototype during, for example, an operation of manufacture of the transparent objects. The invention also relates to the apparatus for conducting this method.

REFERENCES:
patent: 3529169 (1970-09-01), Heaney et al.
patent: 4026656 (1977-05-01), Kusz et al.
patent: 4459487 (1984-07-01), Leser
patent: 4539588 (1985-09-01), Ariessohn et al.

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