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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.

Inactive Publication Date: 2007-12-26
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the subject is of low brightness, if the shutter speed or the aperture is opened to temporarily increase the exposure, as a result, noise other than the image data enters during the exposure, and the noise may generate false peaks, which may lower the focus accuracy.

Method used

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  • Imaging device and imaging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] FIG. 4 shows the operation of the imaging device of the first embodiment. First, the operation is started by operating the releaser shutter button SW1 shown in FIG. 1 , and the brightness of the subject is determined based on the photometry result immediately before the releaser shutter button was pressed (4-2). Subject brightness can be measured from the output of CCD101. A process of selecting a frequency component extraction filter based on the luminance (LV value) obtained from the photometry result (4-3) is performed. In this embodiment, three filters as shown in FIG. 7 are prepared, for example, a frequency extraction filter is selected by processing according to the flowchart shown in FIG. 6 . Specifically, the structures of the three filters shown in FIG. 7 are shown as follows. The first filter is a composite filter of a high-pass filter composed of coefficients '-1', '2', '-1' and a low-pass filter composed of coefficients '1', '2', '1'. The second filter i...

Embodiment 2

[0065] Next, Embodiment 2 will be described with reference to the flowchart shown in FIG. 5 .

[0066] When the releaser shutter button SW1 shown in FIG. 1 is operated, the brightness of the subject is determined based on the photometry result immediately before the releaser shutter button was pressed (5-2). A process of selecting a frequency component extraction filter based on the luminance (LV value) obtained from the photometry result (5-3) is performed. In this embodiment, three filters as shown in FIG. 7 are prepared, and a frequency extraction filter is selected by processing such as the flow chart shown in FIG. 8 . The filter selection process first judges whether the brightness of the subject is less than LV6 (10-1), and if it is not less than LV6, that is, greater than or equal to LV6, it is judged whether it was not selected during the last scan (10-2), if If there is no selection, then select the first filter (10-3), if it was selected during the last scan, then p...

Embodiment 3

[0072] Next, Embodiment 3 will be described centering on the flowchart shown in FIG. 9 . When the releaser shutter button SW1 shown in FIG. 1 is operated, the brightness of the subject is determined based on the photometry result before the releaser button is pressed (11-2). Next, the focus lens is moved to the focus start position (11-3), and pixel data is acquired (11-4). This pixel data is a digital RGB signal taken into the CCD I / F block of the digital signal processing IC. After the acquisition of the pixel data, it is judged whether or not scanning has been completed to the end of the focus position (11-5). If the end point of the focus position is not completed, the focus position is moved sequentially (11-6), the end point is scanned, and the same process is performed until the end (11-5).

[0073] Next, a frequency component extraction filter is selected based on the luminance (LV value) obtained from the photometry result (11-7). In this embodiment, three filters ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232H04N5/235G02B7/28G02B7/36G03B7/08G03B7/28G03B13/36H04N101/00
Inventor 伊藤圭
Owner RICOH KK
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