Method of and arrangement for reading a bar code on photographic material
AssigneeAgfa-Gevaert
InventorUlrich Klueter
Life of this patent
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Abstract
A bar code is scanned to generate a signal which is representative of the bar code and contains a series of maxima and minima. The signal is sampled to detect the maxima and minima corresponding to the encoded information of the bar code. The detected maxima are compared with an upper threshold value while the detected minima are compared with a lower threshold value. For each detected maximum and minimum, a "0" or "1" is entered in a memory depending upon whether or not the detected maximum or minimum exceeds the corresponding threshold value. This produces an array of bits which is then decoded.
Claims26
A method of reading a code, particularly in a photographic printer, comprising the steps of scanning said code;
- generating a data signal representative of said code based on the scanning step, said data signal having maxima and minima;
- establishing the type of said code using said data signal;
- sampling a selected part of said data signal to detect selected maxima and selected minima;
- comparing each of said selected maxima with a first value and each of said selected minima with a second value;
- and deriving a decipherable set of data bits using the results of the comparing step.
An arrangement for reading a code, particularly for use in a photographic printer, comprising means for scanning the code and generating a data signal which contains maxima and minima and is representative of the code;
- and means for establishing the type of the code using the data signal, sampling a selected part of the data signal to detect selected maxima and selected minima, comparing each of the selected maxima with a first value and each of the selected minima with a second value, and deriving a decipherable set of data bits using the results of the comparisons.
An arrangement for reading a code, particularly a code on a margin of a photographic material, the code having a clocking section containing alternating light and dark segments, and another section laterally adjacent the clocking section and containing encoded information, said arrangement comprising means for positioning the code means for detecting the code and for generating a data signal which is representative the code and includes a first part corresponding to a light segment, and a second part corresponding to a dark segment, of the clocking section, said detecting and generating means including a sensor for scanning both sections of the code simultaneously;
- and means for comparing the first part of the data signal with a first value and the second part of the data signal with a second value different from the first value.
Dependencies are inferred from the claim text.