Method to control image stabilizer
AssigneesOptoelectronics Co., Ltd., Opticon, Inc.
InventorsTakayuki Fujisaki, Asuka Yamada
Life of this patent
Estimating the term…
Abstract
A stepper motor is controlled by a driver having a constant and maximum frequency input in order to correct for camera shake. The need for variable frequency devices is eliminated, thereby reducing the cost and complexity of the system.
Claims11
A method of compensating for camera shake comprising controlling a stepper motor with a driver responsive to a comparator generating an output signal having a magnitude and sign, said driver being controlled by the comparator and a fixed frequency clock pulse the driver so as to move the stepper motor in one of two directions if the sign is positive and in the opposite direction if the sign is negative, and by a predetermined amount during a clock cycle, regardless of magnitude.
The method of 2 wherein the integrator is implemented in software.
Apparatus for correcting for camera shake in a symbol capture device, said apparatus comprising a comparator for comparing present camera position to a desired camera position, and generating an output signal having a magnitude and sign which, in response to said comparison, causes a stepper motor to be either moved in a first direction if said sign is positive, moved in an opposite direction if said sign is negative, or by a predetermined amount during a clock cycle, regardless of said magnitude.
Dependencies are inferred from the claim text.