Resources Contact Us Home
Focus control apparatus useful for image pick up apparatuses equipped with an auto focus function and method therefor

Image Number 4 for United States Patent #8120698.

A focus control apparatus and method capable of shortening a focus adjustment time in focus control. The method includes extracting a first high frequency component depending upon a first cutoff frequency and a second high frequency component depending upon a second cutoff frequency higher than the first cutoff frequency from a video signal, generating first and second contrast signals of the video signal respectively based on the first and second high frequency components, using a quotient obtained by dividing a value of the first contrast signal by that of the second contrast signal as a parameter, exercising focus control based on the parameter, and setting the first and second cutoff frequencies so as to cause a value of the parameter to assume a peak when a focus lens in an image pickup apparatus is located in a position at a predetermined distance from an in-focus position.

  Recently Added Patents
Keyswitch controller
Factor IXa crystals, related complexes and methods
Filler containing composition and process for production and use thereof
Cell proliferation inhibitor
Electronic device, information processing method, and storage medium
Method and system for streaming digital video content to a client in a digital video network
Uni-directional transient voltage suppressor (TVS)
  Randomly Featured Patents
Float glass forming chamber with cast roof
Force-measuring devices
Method and apparatus for DUV transmission mapping
Non-wicking siding
System and method for encoding video with luminance intensity variations
Switched-capacitor DAC/continuous-time reconstruction filter interface circuit
System and method for instantaneously deploying packetized alert data
Fabrication method for a flange-type ball valve
Stationary exercise device