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Image pick-up device and image pick-up method

A technology for a camera device and a subject to be photographed, which is applied in the directions of measuring devices, focusing devices, static cameras, etc.

Inactive Publication Date: 2006-09-06
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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  • Image pick-up device and image pick-up method
  • Image pick-up device and image pick-up method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Figure 4 The operation of the imaging device of the first embodiment is shown. First, by operating figure 1 The shown releaser shutter button SW1 starts to operate, 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 example, prepare as Figure 7 The three filters shown, for example, by following the Figure 6 The process shown in the flowchart to select the frequency extraction filter. Concrete representation Figure 7 The structures of the three filters shown are 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 fi...

Embodiment 2

[0065] Next, with Figure 5 The shown flowchart is centered, and Example 2 is demonstrated, referring to it.

[0066] figure 1 When the shown releaser shutter button SW1 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 example, prepare as Figure 7 of the three filters shown, by e.g. Figure 8 Shown in the flowchart is such processing to select the frequency extraction filter. 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 th...

Embodiment 3

[0072] Next, with Figure 9 The shown flowchart focuses on Embodiment 3. operate figure 1 When the releaser shutter button SW1 is shown, the brightness of the subject is determined based on the photometry result immediately before the releaser button was 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 example, prepare as Figure ...

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Abstract

Provide a kind of Image pick-up device and method, which can focus even if in the condition of decreasing the pink of AF evaluation value or emerging the several peaks because of noise. The device includes: electric filter selection unit that select several electric filters that have different penetration frequency component with each other and the electric filter that make the specific penetration frequency component of the body image shot by image pick-up device penetrated the several electric filters described above; the frequency component detecting unit that detect the frequency signal of electric filter that come from selection by electric filter selection unit, electric filter selection unit change the electric filter according to image pick-up condition. Bearing photometric unit measure the brightness of shot body, electric filter selection unit change the electric filter according to the measure result of photometric unit. The photometric unit is divided several photometric area by the shot body, which proceed photometric according to the evaluation value of the divided respective photometric area, the descriptive electric filter selection unit change the electric filter according to the measure result of photometric unit.

Description

technical field [0001] 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 [0002] 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 obtained from an image signal output from an imaging element, and the integrated value of the luminance difference is used as an AF evaluation value indicating a degree of focus. In the in-focus state, the outline of...

Claims

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Application Information

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IPC IPC(8): H04N5/232H04N5/235G02B7/28G02B7/36G03B7/08G03B7/28G03B13/36H04N101/00
Inventor 伊藤圭
Owner RICOH KK
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