Binarization circuit
AssigneeOlympus Optical Co., Ltd.
InventorsTakeshi Mori, Kosei Tamiya
Life of this patent
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Abstract
A period extracting section extracts a specific period in a dot code in an image signal corresponding to the dot code, and this specific period is supplied field by field to a maximum value detection section and a minimum value detection section via a detection gate. A threshold value detection section computes the binary threshold value from the detected field-by-field maximum value and minimum value, and holds it in a data holding section. A comparator compares the held threshold value with an image signal with the dot period emphasized by a signal processor to thereby binarize the image signal corresponding to the dot code.
Claims7
An information reproduction system comprising:
- a light source for lighting optically readable dot codes in pulses when the dot codes are optically read from a recording medium by manual scanning, the recording medium having multimedia data recorded thereon as the dot codes, the multimedia data including at least one of audio data, image data and digital code data;
- an image pick-up unit for picking up images of the dot codes when the dot codes are lit in pulses by said light source during the manual scanning;
- processing means for performing predetermined processing on image signals respectively corresponding to the picked-up images so as to restore the multimedia data;
- outputting means for reproducing and outputting the multimedia data based on an output signal from said processing means;
- detecting means for detecting reflection light amounts from the recording medium when the dot codes are lit in pulses by said light source while said image pick-up unit is being moved over the dot codes;
- and
- light controlling means for controlling a pulse of pulse lighting of said light source in accordance with the reflection light amounts detected by said detection means.
Dependencies are inferred from the claim text.