Process for automatic focusing

A kind of automatic focus and technical technology, applied in the field of intelligent multi-point focus technology, can solve the problems of finding the best focus position, not working normally, insufficient ambient brightness, etc., and achieve the effect of reducing processing power requirements and accurate focusing

Inactive Publication Date: 2003-12-31
GUANGDONG VIMICRO
View PDF1 Cites 54 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The TTL method has the advantages of correct long-distance focus and no parallax in focus. The disadvantage is that it cannot work normally when the light is too dark and the contrast of the object is low.
[0006] The accuracy of traditional autofocus technology depends on the AF evaluation value. However, since the AF evaluation value only contains contrast ...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for automatic focusing
  • Process for automatic focusing
  • Process for automatic focusing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] The present invention will be described in more detail below in conjunction with the accompanying drawings and non-specific embodiments.

[0048] The digital imaging system adopting the intelligent multi-point focus technology of the present invention at least includes lens, photosensitive sensor such as CCD or CMOS sensor, A / D conversion circuit, exposure detection circuit, focus detection circuit, microcomputer, RAM and transmission mechanism, etc. part.

[0049] Take a digital camera as an example: figure 1 Shown is a block diagram of a digital camera using intelligent multi-point focusing technology, including an automatic zoom lens 10, a CCD or CMOS sensor 11, an A / D conversion circuit 12, an exposure detection circuit 13, a focus detection circuit 14, and a microcomputer 15 , RAM16, shutter switch 17, autofocus switch 18, flashlight 19 and transmission mechanism 20 etc. several parts.

[0050] Such as figure 2 Shown is to adopt the digital camera work flow ch...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The automatic focusing technology is used for finding out optimized focus position in the cases of insufficient background brightness, over large distance between the taken body and the background and varying background during focusing. The automatic focusing process includes the following steps: adjusting the focal length of the lens in the focusing range to obtain one frame of digital image in each relative position; separating the digital image into several regions and finding out the evaluation value for each region; weighting each region; finding out relative position evaluation value to the digital image found for each relative position based on the region evaluation value and region weight; recording the relative position with maximum evaluation value and focusing the lens to the position as optimal focusing position.

Description

technical field [0001] The invention relates to an automatic focus technology, in particular to an intelligent multi-point focus technology used in a digital imaging system. Background technique [0002] In the process of image shooting, the distance between the camera or video camera and the object is often changed, so the image is often blurred due to exceeding the depth of field range. In order to keep the image clear, it is necessary to change the focus position of the lens during the viewfinder process to keep the image clear. This process of adjusting the focus position is called focusing or focusing. [0003] Autofocus technology has been widely used in imaging fields such as cameras, video cameras, and image scanning. It enables the imaging system to automatically adjust the position of the focusing lens group in the lens according to the distance of the object, so that the object is clearly imaged on the imaging plane. There are many kinds of autofocus methods in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G02B7/28G02B7/36H04N5/232
Inventor 俞青卢波荣坚
Owner GUANGDONG VIMICRO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap