Blur correction apparatus and image capture apparatus
AssigneeCanon Kabushiki Kaisha
InventorKenichi Miyasako
Life of this patent
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Abstract
Upon detecting the start of a panning operation, an adder-subtractor applies an offset from an offset change circuit to the output of an HPF (High-Pass Filter) representing the shake amount of an image capturing apparatus to decrease the shake amount. The offset value is set to be larger as the value of shake correction data output from a focal length calculation circuit is closer to the correction limit of a blur correction circuit. Upon detecting the end of the panning operation, the offset value is returned to zero. This invention provides a blur correction apparatus capable of suppressing degradation of a blur correction effect even when in a panning state.
Claims6
A blur correction apparatus comprising:
- a computation unit configured to compute, based on an output of a shake detection unit, data for correcting image shake;
- a panning determination unit configured to determine, based on an output of the shake detection unit, whether a panning operation is being done;
- an offset value generation unit configured to generate an offset value to be subtracted from the data for correcting image shake;
- and
- a control unit configured to control a shake correction unit based on an output of the shake detection unit, in order to correct image shake,
- wherein the offset value is data for returning the shake correction unit approaching a correction limit to a correction center position,
- wherein, if it is determined by said panning determination unit that a panning operation is being done, said control unit controls the shake correction unit based on data obtained by subtracting the offset value from the data for correcting image shake, and
- wherein said offset value generation unit generates the offset value so that a first offset value corresponding to a first focal length of an imaging optical system is smaller than a second offset value corresponding to a second focal length of the imaging optical system being smaller than the first focal length.
A control method of an blur correction apparatus comprising:
- a computation step of computing, based on an output of a shake detection unit, data for correcting image shake;
- a panning determination step of determining, based on an output of the shake detection unit, whether a panning operation is being done;
- an offset value generation step of generating an offset value to be subtracted from the data for correcting image shake;
- and
- a control step of controlling a shake correction unit based on an output of the shake detection unit, in order to correct image shake,
- wherein the offset value is data for returning the shake correction unit approaching a correction limit to a correction center position,
- wherein, if it is determined in said panning determination step that a panning operation is being done, in said control step, the shake correction unit is controlled based on data obtained by subtracting the offset value from the data for correcting image shake, and
- wherein, in said offset value generation step, the offset value is generated so that a first offset value corresponding to a first focal length of an imaging optical system is smaller than a second offset value corresponding to a second focal length of the imaging optical system being smaller than the first focal length.
Dependencies are inferred from the claim text.