Auto-focus regulating method for video cameras and device thereof
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United States of America Patent
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Dec 19, 1995
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N/A
app pub date -
Sep 30, 1993
filing date -
Mar 31, 1993
priority date (Note) -
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Abstract
An auto-focus regulating method for a video camera includes the steps of: obtaining slopes between adjacent pixels contained in a sampling area constituting at least part of a frame screen; integrating all slopes of the sampling area: calculating the difference of the integrated values between the previous and following frame screens; and performing a focus control so that the integrated values in the following frame screens are increased by the difference of the integrated values. The auto-focus regulating method for video cameras has an advantage that various focus modes can be provided compared with the conventional method by which the focus is regulated by the sum of envelopes.
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