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
Unsupervised document clustering using latent semantic density analysis
Automated difference recognition between speaking sounds and music
System and method for content delivery
Image forming apparatus with static elimination
Photon density wave based determination of physiological blood parameters
Data processor and scanner device
Method, system, and computer program product for scoring theoretical peptides
  Randomly Featured Patents
Solid-state blue laser device capable of producing a blue laser beam having high power
Point of view gists and generic gists in a document browsing system
Reconfigurable optoelectronic circuit
Power control for a transmitter
Method and apparatus for performing fast power control in a mobile communication system
Synchronous communication interface for reducing the effect of data processor latency
Method and apparatus for operating multiple tools in a well
Picture display-image pickup apparatus
Method for treating brass