Imaging device and imaging method

A technology of a camera device and a camera element, which is applied in the direction of focusing device, measuring device, static camera, etc., can solve the problems of entering and focusing accuracy decline, etc.
CN101094328AInactive Publication Date: 2007-12-26RICOH KK
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
RICOH KK
Publication Date
2007-12-26
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

To obtain an imaging device and an imaging method, which are capable of focusing even in such an environment that a peak of the AF evaluation value is made lower or a plurality of peaks appear due to noise. The imaging device is provided with a filter selection means for selecting a filter transmitting an arbitrary frequency component of a subject image and a frequency component detection means for detecting a frequency signal from the filter selected by the filter selection means, and the filter selection means changes the filter in accordance with a photographing condition. The imaging device is provided with a photometric means for measuring subject luminance, and the filter selection means changes the filter in accordance with a measurement result obtained by the photometric means. The photometric means is so configured that the subject image is divided into a plurality of photometric areas and evaluation values of respective divided areas are obtained to perform photometry, and the filter selection means changes the filter in accordance with the measurement result obtained by the photometric means.
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Description

[0001] The present invention is a divisional application of the following patent application: application number: 200610009500.7, application date: 2006.2.23, invention name: imaging device and imaging method technical field

[0002] The present invention relates to an imaging device and method for performing automatic focus detection, especially automatic focus detection according to the brightness of a subject, and is suitable for electronic imaging devices such as digital cameras, for example. Background technique

[0003] Electronic imaging devices such as digital cameras generally include an autofocus (hereinafter referred to as 'AF') device for automatically focusing on a subject. As an AF control method in an AF device, gradient (mountain climbing) (maximum point detection) AF control (contrast AF control) is widely used (for example, refer to Patent Document 1). In this gradient AF control, an integral value of a luminance difference between adjacent pixels is obtain...

Claims

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