G - Physics – 01 – N
Patent
G - Physics
01
N
341/41, 340/123.
G01N 21/84 (2006.01) G03B 27/62 (2006.01) G03D 15/10 (2006.01)
Patent
CA 1247715
ABSTRACT OF THE DISCLOSURE A method of automatically detecting the locations of the frame lines of a reversal film as it is supplied to a pro- cessing station, such as a cutting and mounting station, a notch- ing station or the like, so that the frame lines can be used as reference marks for the positioning of the film in the processing station, wherein the film is moved past optoelectronic scanning means in steps which amount to only a fractional part of the nor- mal width of a frame line, said optoelectronic scanning means generate an analog voltage which represents the accumulated light transmission of the film in a scanned area which extends at right angles to the direction of travel of the film substantially across the picture area of the film and has a width which is only a fractional part of a normal width of a frame line, and the extreme value of said voltage obtained during a scanning of at least one normal frame length and corresponding to the lowest light transmission is evaluated as a representation of the light transmission of the scanned film at a frame line is so improved that a confusion between frame lines and frame line like picture elements will be reliably precluded and which can be carried out with apparatus which is uncomplicated and troubleproof. This is accomplished in that a) the analog voltage is digitalized by means of an analog-to-digital converter, and the digital data obtained for each step of travel are stored for an interval of time which corresponds to the travel over a plurality of frame lengths, and b) the digital data which are stored at a time are compared with each other and those digital data which represent the extreme voltage value are regarded as being associated with a frame line if the number of such data which occur in an uninter- rupted sequence corresponds to a frame line width, with a prede- termined tolerance allowance, and are regarded as being associ- ated with an unexposed frame area if a larger number of such data occur in an uninterrupted sequence.
491398
Fruth Rupert
Pohl Claus
Stemmer Gottfried
Geimuplast Peter Mundt Gmbh & Co. Kg
Marks & Clerk
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