05359668 is referenced by 1 patents and cites 11 patents.

Method for determining the image clarity of a surface of a sheet strip or similar, including projection of an image on the surface, detection of a virtual image of the image projected onto the surface and the processing of the detected virtual image into a signal which is presented as a measure for the image clarity of the surface, wherein the image reflected onto the surface is composed of a two-dimensional array of distinct light spots, whereby the processing of the detected virtual image includes the steps of (i) digitizing the detected virtual image with reference to at least one greyness discriminator value, and (ii) determining, for the greyness discriminator value, the number of distinct light spots in the digitized detected virtual image, and from steps (i) and (ii) obtaining a signal measuring image clarity of the whole area of the surface illuminated by the image projected onto the surface.

Title
Method and apparatus for determining the image clarity of a surface
Application Number
7/946440
Publication Number
5359668
Application Date
November 18, 1992
Publication Date
October 25, 1994
Inventor
Wilhelmus J van der Meer
Amsterdam
NL
Christiaan T W Lahaije
Heerhugowaard
NL
Agent
Stevens Davis Miller & Mosher
Assignee
Hoogovens Groep
NL
IPC
G01N 21/55
View Original Source