Shake detection and compensation system using high-pass filter arithmetic means
First Claim
1. A shake detection apparatus comprising:
- shake detection sensor means for detecting a shake state to output a shake detection signal;
high-pass filter arithmetic means for performing high-pass filter arithmetic processing, thereby removing drift and offset components contained in the shake detection signal output from said shake detection sensor means;
time constant increasing means for shifting an upper limit frequency for high-pass filter arithmetic processing by said high-pass filter arithmetic means from a high-frequency side to a low-frequency side;
large-shake-signal determination means for detecting a large shake signal state on the basis of an output from said high-pass filter arithmetic means; and
small-time-constant resetting means for shifting the upper limit frequency for high-pass filter arithmetic processing by said high-pass filter arithmetic means to the high-frequency side when the large shake signal state is detected by said large-shake-signal determination means.
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Abstract
A camera shake detection apparatus includes a camera shake sensor unit, an HPF arithmetic unit for removing drift and offset components of the camera shake sensor unit, an HPF large signal determination unit for detecting a large shake signal state from an output from the HPF arithmetic unit, a small-time-constant resetting unit for shifting an upper limit frequency for signal removal of the HPF arithmetic unit to a high-frequency side when a large shake is detected by the HPF large signal determination unit, and a time constant increasing unit for shifting the upper limit frequency for signal removal of the HPF arithmetic unit from the high-frequency side to a low-frequency side. According to this arrangement, when the camera shake is large, the offset component is actively removed by the high-pass filter. When the camera shake is small, the camera shake detection frequency band is extended. Therefore, an offset component can be removed from a signal determined to a camera shake signal at any time, and the ratio of effective components in the signal can be accurately and precisely detected.
40 Citations
27 Claims
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1. A shake detection apparatus comprising:
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shake detection sensor means for detecting a shake state to output a shake detection signal; high-pass filter arithmetic means for performing high-pass filter arithmetic processing, thereby removing drift and offset components contained in the shake detection signal output from said shake detection sensor means; time constant increasing means for shifting an upper limit frequency for high-pass filter arithmetic processing by said high-pass filter arithmetic means from a high-frequency side to a low-frequency side; large-shake-signal determination means for detecting a large shake signal state on the basis of an output from said high-pass filter arithmetic means; and small-time-constant resetting means for shifting the upper limit frequency for high-pass filter arithmetic processing by said high-pass filter arithmetic means to the high-frequency side when the large shake signal state is detected by said large-shake-signal determination means. - View Dependent Claims (2, 3)
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4. A camera with a camera shake prevention function, comprising:
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camera shake detection sensor means for detecting a camera shake applied to said camera to output a camera shake detection signal; high-pass filter arithmetic means for performing high-pass filter arithmetic processing, thereby removing drift and offset components contained in the camera shake detection signal output from said camera shake detection sensor means; time constant increasing means for shifting an upper limit frequency for high-pass filter arithmetic processing by said high-pass filter arithmetic means from a high-frequency side to a low-frequency side; large-shake signal determination means for detecting a large-shake signal state on the basis of an output from said high-pass filter arithmetic means; small-time-constant resetting means for shifting the upper limit frequency for high-pass filter arithmetic processing by said high-pass filter arithmetic means to the high-frequency side when the large-shake signal state is detected by said large-shake signal determination means; and camera shake prevention means for preventing a degradation in a photographic image, which is caused by a camera shake in said camera, on the basis of an output from said high-pass filter arithmetic means. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A shake detection apparatus for a camera, comprising:
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a shake detection sensor for detecting a shake applied to said camera to output a shake detection signal; a high-pass filter for removing drift and offset components contained in the shake detection signal output from said shake detection sensor; and time constant changing means for changing a cutoff frequency of said high-pass filter, said time constant changing means changing the cutoff frequency on the basis of the shake detection signal output from said shake detection sensor. - View Dependent Claims (11, 12, 13, 14)
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15. A camera shake detection apparatus comprising:
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camera shake sensor means for detecting a camera shake state to output a camera shake detection signal; high-pass filter arithmetic means for removing drift and offset components contained in the camera shake detection signal output from said camera shake sensor means; first time constant changing means for shifting a cutoff frequency of said high-pass filter arithmetic means from a high-frequency side to a low-frequency side; and second time constant changing mean for shifting the cutoff frequency of said high-pass filter arithmetic means to the high-frequency side when a large shake state is detected on the basis of an output from said high-pass filter arithmetic means. - View Dependent Claims (16, 17)
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18. A camera shake prevention apparatus for a photographing apparatus, comprising:
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a camera shake detection apparatus comprising a) camera shake sensor means for detecting a camera shake state to output a camera shake detection signal, b) high-pass filter arithmetic means for removing drift and offset components contained in the camera shake detection signal output from said camera shake sensor means, c) first time constant changing means for shifting a cutoff frequency of said high-pass filter arithmetic means from a high-frequency side to a low-frequency side, and d) second time constant changing mean for shifting the cutoff frequency of said high-pass filter arithmetic means to the high-frequency side when a large shake state is detected on the basis of an output from said high-pass filter arithmetic means; and camera shake prevention means for preventing a degradation in a photographic image, which is caused by a camera shake, on the basis of an output from said camera shake detection apparatus. - View Dependent Claims (19, 20, 21)
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22. A shake detection apparatus comprising:
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shake sensor means for detecting a shake state to output a shake detection signal; high-pass filter arithmetic means for removing drift and offset components contained in the shake detection signal output from said shake sensor means; first time constant changing means for shifting a cutoff frequency of said high-pass filter arithmetic means from a high-frequency side to a low-frequency side; determination means for determining, on the basis of an output from said high-pass filter arithmetic means, that a magnitude of the shake state is not less than a predetermined value; and second time constant changing means for shifting the cutoff frequency of said high-pass filter arithmetic means to the high-frequency side when the shake state having the magnitude not less than the predetermined value is detected by said determination means. - View Dependent Claims (23)
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24. A shake detection apparatus comprising:
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shake sensor means for detecting a shake state to output a shake detection signal; high-pass filter arithmetic means for removing drift and offset components contained in the shake detection signal output from said shake sensor means; first time constant changing means for shifting a cutoff frequency of said high-pass filter arithmetic means from a high-frequency side to a low-frequency side; and second time constant changing means for changing the cutoff frequency of said high-pass filter arithmetic means on the basis of a magnitude of the shake state. - View Dependent Claims (25)
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26. A shake detection apparatus comprising:
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shake sensor means for detecting a shake state to output a shake detection signal; high-pass filter arithmetic means for removing drift and offset components contained in the shake detection signal output from said shake sensor means; and time constant changing means for shifting a cutoff frequency of said high-pass filter arithmetic means from a high-frequency side to a low-frequency side on the basis of the shake state. - View Dependent Claims (27)
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Specification