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Image capturing apparatus and focusing method

一种图像捕捉、设备的技术，应用在图像通信、字符和模式识别、电视等方向，能够解决难以准确聚焦、搜索聚焦位置很长时间等问题，达到减少需要的时间、快速且准确对焦调节、准确对焦调节的效果

Inactive Publication Date: 2008-07-02
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the related art, it takes a long time to perform face detection and search for a focus position in contrast AF thereafter
Therefore, when performing AF in the detected face area, it is difficult to accurately focus on the face in the case of subject motion or camera shake

Method used

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  • Image capturing apparatus and focusing method
  • Image capturing apparatus and focusing method
  • Image capturing apparatus and focusing method

Examples

Experimental program
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Effect test

no. 2 example

[0060] FIG. 4 is a block diagram of a camera 200 according to the second embodiment of the present invention. The camera 200 has the same elements shown as the camera 100 in the first embodiment, and further includes an SDRAM controller 75, an SDRAM 74, a DMAC (Direct Memory Access Controller) 81, a display circuit 83, and a signal processing unit 110.

[0061] The signal processing unit 110 converts the CCD-RAW image data input from the imaging circuit 108 into a YC signal. Subsequently, the DMAC 81 sends the obtained YC signal to the SDRAM controller 75, and the controller 75 writes the YC signal to the SDRAM 74. The DMAC 81 further sends the YC signal read from the SDRAM 74 by the SDRAM controller 75 to the display circuit 83, the AF evaluation value determination unit 109, and the face detection unit 20.

[0062] The YC signal sent from the SDRAM 74 to the display circuit 83 through the DMAC is converted into a signal of a predetermined format (for example, an NTSC format colo...

no. 3 example

[0071] The camera 100 of the first embodiment has a simple circuit structure and therefore has the advantage of low power consumption. On the other hand, the camera 200 of the second embodiment has higher power consumption, but the focus on the face is more accurate. The third embodiment provides a camera having the above two advantages.

[0072] FIG. 6 is a block diagram of a camera 300 according to the third embodiment of the present invention. The structure is partially similar to that of the first and second embodiments, but the difference is that the face detection unit 20 includes a selection unit 20a, and the AF evaluation value determination unit 109 includes a selection unit 109a.

[0073] The selection unit 20a is used to select one of the imaging circuit 108 and the SDRAM 74 as the supply source of the through image supplied to the face detection unit 20. When the selection unit 20a selects the imaging circuit 108 as the supply source of the through image, the face dete...

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PUM

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Abstract

The invention discloses an image capturing device and a focusing method. The image capture device includes: an acquisition optical system including a focusing lens; an imaging unit that receives object light through the acquisition optical system and converts the object light into image data representing a frame image; Detect the face area of ​​people in the first frame image of one; Face detection setting unit, set the position and the size of face area detection range in the second frame image after the first frame image provided by imaging unit for face detection unit; a focus area defining unit defining a focus evaluation value calculation area in a third frame image following the second frame image provided by the imaging unit; a calculation unit calculating a focus evaluation value; and a focus adjustment unit based on the focus evaluation calculated by the calculation unit value to adjust the focal length of the focusing lens.

Description

Technical field [0001] The invention relates to the focusing of an image capture device. Background technique [0002] Japanese Patent Application Publication No. 2005-318554 discloses that an image for face detection is used in a camera to perform control such as AE / AF / AWE, thereby improving focus accuracy in the case of object movement or camera shake. [0003] Japanese Patent Application Publication No. 2006-025238 discloses that the size of a person's face is determined based on the estimated distance to the subject being focused, and face detection is performed using the determined size, thereby shortening the face detection time. [0004] Japanese Patent Application Publication No. 2005-215750 discloses that a face detection area is determined based on image data and related information, and face detection is partially performed on the face detection area. [0005] Techniques for face detection and automatic focus (AF) adjustment within the detected face area are well known...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232G06K9/00
CPCG06V40/161H04N23/675H04N23/61H04N23/611
Inventor 船本宪司
Owner FUJIFILM CORP
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