METHOD AND DEVICE FOR MEASURING THE PERCENTAGE OF THE DARK OR LIGHT PARTS BY A SURFACE UNIT, OF HALF TINT POINTS OF AN IMAGE

摘要

P A LIGHT BEAM IS GENERATED BY A LIGHT SOURCE 1, SENT ON AN OBJECT 4 TO BE MEASURED, THE LIGHT BEAM THAT CROSSES OBJECT 4 IS RECEIVED BY A PHOTOELECTRIC ELEMENT 9, WHEN MEASURING AN OBJECT HAVING A RATE OF HALF-TINT POINT SURFACE OF APPROXIMATELY 50, A MEASUREMENT AREA OF THE OBJECT IS DETERMINED IN RELATION TO THE SIZE OF THE MESH OF ITS FRAME AS THE RELATIONSHIP BETWEEN THE DARK AND CLEAR PARTS OF THE MEASURED AREA OF THE SUBJECT IS SUBSTANTIALLY THE SAME AS THE SURFACE RATE OF THE HALF-TINT POINTS. /P