Method and device for improving automatic focusing accuracy and speed of camera

An automatic focus and camera technology, applied in image communication, color TV parts, TV system parts, etc., can solve problems such as bad peak, fluctuation, and extreme value search algorithm is easy to fall into local extremum

Pending Publication Date: 2019-08-23
JINAN JOVISION TECH CO LTD
View PDF0 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing disclosed technical solutions propose a method for calculating the image focus evaluation value using the spatial domain and frequency domain sharpness evaluation value algorithms. These image sharpness evaluation methods can obtain better focus curve monotonicity and peaks in scenes with better light , but in scenes with weak light, low contrast or complex lighting, it will be affected by noise and light. The specific performance is that the monotonicity is not obvious, the glitch phenomenon is serious, the pe

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
  • Method and device for improving automatic focusing accuracy and speed of camera
  • Method and device for improving automatic focusing accuracy and speed of camera
  • Method and device for improving automatic focusing accuracy and speed of camera

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] In order to more clearly illustrate the technical purpose, implementation process and advantages of the present invention, the following further elaborates on the embodiments of the present invention with reference to the accompanying drawings. The listed embodiments are only a part of the embodiments of this application, not all of them. The manners are exhaustive, and if there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0045] The first embodiment of the present invention relates to a method for improving the accuracy and speed of camera auto-focusing. The method adopts different image sharpness evaluation algorithms and extreme value search algorithms for different characteristics of images under different illuminances, so as to improve weak The purpose of focusing accuracy and speed of the lighting scene. Such as figure 1 As shown, this implementation includes the following steps:

[0046] S1, video image ...

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 invention relates to the field of image processing and food monitoring, and particularly discloses a method and a device for improving the automatic focusing accuracy and speed of a camera. The method for improving the automatic focusing accuracy and speed of the camera is characterized by sequentially comprising the steps of video image collection, image format conversion, focusing template setting, night vision low-illumination scene definition evaluation value calculation, daytime scene definition evaluation value calculation, peak searching and motor-driven lens focus finding. The threshold value of the change of the definition evaluation value in the hill climbing algorithm is adaptively adjusted according to the brightness contrast, the gradient contrast and the ISO value, the change trend of the current evaluation value can be effectively judged, the peak value can be found more quickly, and the automatic focusing speed and accuracy of night vision and low-illumination scenes are improved.

Description

[0001] (1) Technical field [0002] The invention relates to the field of image processing and food monitoring, in particular to a method and device for improving the accuracy and speed of automatic focusing of a camera. [0003] (2) Background technology [0004] Focusing can be divided into two categories, one is automatic focus, and the other is manual focus. When the camera first appeared, the focus could only be achieved by manually adjusting the focus ring. With the continuous improvement and development of technology, autofocus technology has also emerged. Automatic focusing is also divided into two categories: (1) Active: The infrared generator and ultrasonic generator on the camera emit infrared light or ultrasonic waves to the subject, and the receiver on the camera receives the emitted infrared light or ultrasonic waves for active focusing. Type focus. This method is difficult to focus on oblique surfaces, smooth surfaces, light-absorbing or wave objects, and difficult ...

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): H04N5/232
CPCH04N23/67H04N23/673
Inventor 李铭
Owner JINAN JOVISION TECH CO LTD
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