Focal length detecting method, focusing device, image capturing method and image capturing apparatus
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United States of America Patent
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Issued Date -
Sep 29, 2005
app pub date -
Mar 26, 2004
filing date -
Mar 26, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An image processing circuit enables the accurate detection of the focal length for focusing by using color data. The image processing circuit generates image data representing brightness and each of the colors of red, green and blue, image data to be used for focusing is selected either automatically or manually from the image data representing the brightness and the respective colors, and the amount of the weight for each respective image data is set. Images are photographed while the optical system is driven to change its focal length. A focal length is calculated for each selected image data. Weight is applied to each one of the calculated focal lengths so as to calculate a final focal length. This not only ensures accurate measurement of the distance for focusing but also increases the possibility of focusing on a subject which is characterized by specific color data.
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