FIELD: physics, photography.
SUBSTANCE: present invention relates to an image stabilisation apparatus which corrects image blur (image degradation) caused by shaking, such as hand-shaking, and a control method for said image stabilisation apparatus, an optical apparatus and image forming apparatus. The disclosed group of inventions comprises an optical apparatus and an image forming apparatus, which comprise an image stabilisation apparatus, as well as a control method for the image stabilisation apparatus. The image stabilisation apparatus comprises a vibration correction unit which corrects image blur caused by vibrations; a first vibration detection unit which detects angular velocity of vibrations; a first calculation unit which calculates the value of correcting rotational shaking based on the output signal from the first vibration detection unit; a second vibration detection unit which detects vibrations using a method other than the method of the first vibration detection unit; a second calculation unit which calculates a correction value from output signals of the first vibration detection unit and the second vibration detection unit and calculates the correction value of back-and-forth shaking based on the correction value and output signal of the first vibration detection unit; a drive unit which drives the vibration correction unit based on at least one of the correction value of rotational shaking and the correction value of back-and-forth shaking; and a variation module which, when the main object occupies a smaller portion of the entire screen, changes the correction value of back-and-forth shaking such that it is less than when the main object occupies a larger portion. The disclosed control method for the image stabilisation apparatus comprises steps of detecting angular velocity of vibrations using the first vibration detection unit; calculating the correction value of rotational shaking based on the output signal from the first vibration detection unit; detecting vibrations using the second vibration detection unit using a method other than the method of the first vibration detection unit; calculating a correction value from output signals of the first vibration detection unit and the second vibration detection unit and calculating the correction value of back-and-forth shaking based on the correction value and the output signal of the first vibration detection unit; driving the vibration correction unit based on at least one of the correction value of rotational shaking and the correction value of the back-and-forth shaking; and changing, when the main object occupies a smaller portion of the entire screen, the correction value of back-and-forth shaking such that it is less than when the main object occupies a larger portion.
EFFECT: obtaining images with higher accuracy of stabilisation by correcting vibrations for the main object and correcting vibrations for the background in a reasonable ratio when capturing a moving image.
12 cl, 12 dwg
