Tonal conversion method for pictures
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United States of America Patent
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May 17, 1994
Grant Date -
N/A
app pub date -
Feb 16, 1990
filing date -
May 31, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed herein is a tonal conversion method of a picture useful upon producing a reproduced picture such as hard or soft reproduced picture from an original picture recorded or otherwise stored on a recording medium. Tonal conversion is conducted in such a way that the pictorial information value (X.sub.n) of a picture element on a camera subject; i.e., real picture corresponding to a desired picture element on the original picture, i.e., medium picture is obtained from a density information value (D.sub.n) relating to the density information of the desired picture or the original picture or the medium picture, and converting the thus-obtained pictorial information value (X.sub.n) into a tone intensity value (y) by using a specific tonal conversion formula.
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