US 5,210,559 AGranted

Camera shake correcting device

AssigneeSony Corporation

InventorMitsuharu Ohki

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Abstract

During a signal inputting period while a dynamic image signal of a present field is input, a movement vector detecting circuit 20 calculates a first movement vector V1 of a present field image with respect to a previous field image with a first accuracy. During a vertical blanking period after the signal inputting period, a second movement vector detecting circuit 30 calculates a second movement V2 according to the first movement vector V1 with a second accuracy higher than the first accuracy. A vector adder 34 composes the movement vectors V1 and V2 to obtain a final movement vector Vf. A second control circuit 71 outputs a reading address corresponding to the final movement vector Vf to a field memory 41, and the field memory 41 outputs an image signal corrected in camera shake. Accordingly, a camera shake correction accuracy is greatly improved without almost increasing a scale of a camera shake correcting circuit constructed as a one-chip circuit.

Claims8

Dependent claims

A camera shake correcting device comprising:

a memory for storing a representative image data representing an arbitrary n-th field, where n represents a positive integer;
a first movement vector detecting circuit for searching a corresponding image data corresponding to said representative image data with a first search point density in an (n+i)-th field, where i represents a positive integer, during a signal inputting period as a dynamic image data of said (n+i)-th field and for outputting a displacement of said corresponding image data with respect to said representative image data as a first movement vector;
a field memory for storing said dynamic image data of said (n+i)-th field during said signal inputting period;
and
a second movement vector detecting circuit for searching said corresponding image data with a second search point density higher than said first search point density in the vicinity of an end of said first movement vector during a vertical blanking period just after said signal inputting period and for outputting a displacement of said corresponding image data with respect to said representative image data as a final movement vector;
wherein said dynamic image data of said (n+i)-th field stored in said field memory is read by using a reading address shifted according to said final movement vector.

3 more elements

Dependencies are inferred from the claim text.