Apparatus for detecting movement using a difference between first and second image signals
AssigneeCanon Kabushiki Kaisha
InventorsMasayoshi Sekine, Toshiaki Kondo
Life of this patent
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Abstract
A movement detection apparatus comprises a first circuit for detecting a difference signal between first and second image signals, a second circuit for integrating the difference signal detected by the first circuit, a third circuit for detecting respective image signal levels of the first and second image signals when the image signals reach a predetermined level, a fourth circuit for detecting a difference signal of plural detection results given by the third circuit, and a fifth circuit for dividing the second circuit output signal by the fourth circuit output signal to detect a signal corresponding to image movement.
Claims13
A video camera including:
- an image sensor for converting an image formed on an image sensing plane to an image signal;
- a filter for extracting a predetermined frequency signal from said image signal;
- a first operation circuit for detecting image movement and providing a movement vector, using said predetermined frequency signal output from said filter;
- a memory for storing a characteristic of a relationship between an actual movement of the image and the movement detected by said first operation circuit;
- a second operation circuit for correcting the movement vector, provided by the first operation circuit, using the characteristic stored in said memory;
- and
- a movement compensation device for compensating image movement on the basis of an output of said second operation circuit.
A movement compensating apparatus comprising:
- receiving means for receiving an image signal;
- filter means for extracting a predetermined frequency signal from the image signal;
- vector detecting means for detecting a movement of the image and providing a movement vector, using said predetermined frequency signal output from said filter;
- memory means for storing a characteristic of a relationship between an actual movement of the image and the movement detected by said vector detecting means;
- operation means for correcting the movement vector provided by the vector detecting means, using the characteristic stored in the memory means;
- and
- a movement compensation device for compensating image movement on the basis of an output of said operation means.
Dependencies are inferred from the claim text.