Image processing device, electronic instrument, and method of calibrating anti-aliasing filter
AssigneeSeiko Epson Corporation
InventorKatsuya Ota
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Abstract
An image processing device includes: an anti-aliasing filter, a cutoff frequency of the anti-aliasing filter being variable; an analog-digital (AD) converter which converts an analog signal output from the anti-aliasing filter into a digital signal, and outputs the digital signal; and a filter calibration unit which calibrates the cutoff frequency of the anti-aliasing filter. The filter calibration unit calibrates the cutoff frequency of the anti-aliasing filter based on an output from the AD converter when a predetermined test image signal is input to the anti-aliasing filter.
Claims20
An image processing device comprising:
- an anti-aliasing filter, a cutoff frequency of the anti-aliasing filter being variable;
- an analog-digital (AD) converter which converts an analog signal output from the anti-aliasing filter into a digital signal, and outputs the digital signal;
- and
- a filter calibration unit which calibrates the cutoff frequency of the anti-aliasing filter based on an output from the AD converter when a predetermined test image signal is input to the anti-aliasing filter.
A method of calibrating an anti-aliasing filter which variably controls a cutoff frequency based on a setting value, the method comprising:
- switching a mode from a normal operation mode for performing normal image signal processing to a filter calibration mode for calibrating the cutoff frequency of the anti-aliasing filter based on a predetermined event;
- and
- calibrating the cutoff frequency of the anti-aliasing filter by changing the setting value when a difference between the cutoff frequency of the anti-aliasing filter and a target cutoff frequency has been determined not to be within a predetermined range based on a digital signal obtained by analog-digital-conversion of an analog signal output from the anti-aliasing filter when a predetermined test image signal has been input to the anti-aliasing filter.
Dependencies are inferred from the claim text.