Focusing method for image-capturing device
OwnerChi-Kuei Changinventor
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Abstract
A focusing method for an image-capturing device with a focus is disclosed. The focusing method first determines a maximal contrast value and a corresponding first position of the focus by a focus procedure, and determines a second position of the focus by a calibration procedure. Next, the focusing method compares the first and second positions to generate an adjustment number of steps, and then positions the focus according to the adjustment number. By applying this method, the focus error problem of the image-capturing device can be improved, thereby upgrading the resolution and performance of the image-capturing device.
Claims23
A focusing method for an image-capturing device with a focus comprising:
- performing a focus procedure to determine a first position of the focus, wherein the first position corresponds to a first contrast value;
- performing a calibration procedure to determine a second position of the focus;
- comparing the first and second positions to generate an adjustment number of steps;
- and
- positioning the focus according to the adjustment number of steps.
A method for adjusting a focus step number for a digital imaging device with a focus, the method comprising:
- performing a focus procedure to determine a first step number of the focus, wherein the first step number corresponds to a first contrast value;
- setting the focus at a plurality of step numbers and shooting a corresponding picture at each of the step numbers;
- selecting a second step number from the step numbers according to file size of the corresponding pictures;
- comparing the first and second step numbers to generate an adjustment number of steps;
- and
- adjusting the focus step number of the focus according to the adjustment number of steps.
Dependencies are inferred from the claim text.