Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Camera dynamic exposure adjustment method in automatic driving

A technology of automatic driving and adjustment methods, which is applied in the direction of image communication, TV, color TV parts, etc., to achieve clear details and improve the effect of collected images or videos

Active Publication Date: 2018-12-18
WUHAN KOTEI INFORMATICS
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from the static camera, with the changes of the surrounding environment of the high-speed moving smart car, the moving camera is faced with the ever-changing lighting environment, so the moving camera needs a dynamic exposure adjustment that continuously adjusts the exposure over time method, the existing automatic exposure adjustment method for still cameras cannot meet this requirement

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
  • Camera dynamic exposure adjustment method in automatic driving

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The purpose of this technology embodiment is to dynamically adjust the exposure time in the vehicle environment according to each frame of image output by the camera in real time, that is, to update the value of the optimal exposure time Ex that should be used when updating the next frame of image in real time. The flow of the adjustment method is as follows figure 1 As shown, the specific steps include:

[0034] (1) Carry out on-the-spot calibration of the camera before the departure of the smart car, and obtain the maximum exposure time Emax and the minimum exposure time Emin of the camera according to the weather environment of the day during the calibration. The size of the threshold is obtained to ensure that the picture information is clear. This time the sun is strong, Emax=1500, Emin=10. The maximum and minimum thresholds obtained when the picture quality is counted by Grefer are Gmax and Gmin. The threshold value is properly adjusted. In this embodiment, the ma...

Embodiment 2

[0056] The purpose of this technology embodiment is to dynamically adjust the exposure time in the vehicle environment according to each frame of image output by the camera in real time, that is, to update the value of the optimal exposure time Ex that should be used when updating the next frame of image in real time. The flow of the adjustment method is as follows figure 1 As shown, the specific steps include:

[0057] (1) Carry out on-the-spot calibration of the camera before the departure of the smart car, and obtain the maximum exposure time Emax and the minimum exposure time Emin of the camera according to the weather environment of the day during the calibration. The size of the threshold is obtained to ensure that the picture information is clear. This time the light is darker, Emax=2500, Emin=18. The maximum and minimum thresholds obtained through the picture quality statistics Grefer are Gmax and Gmin, and the thresholds can also be adjusted The size is properly adjus...

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 present invention provides a method for adjusting dynamic exposure of a camera in automatic driving, comprising the steps of: (1) calibrating the camera to obtain the maximum exposure time Emax and the minimum exposure time Emin of the camera, and the maximum grayscale value Gmax of the image captured by the camera and the minimum grayscale value Gmin; (2) extract the image of the current frame of the camera, compare the average grayscale value Gavg of the current frame image with Gmax and Gmin to correct Gavg, according to Gavg and the exposure time Ex' of the last frame image Obtain the pre-adjusted exposure time Etmp of the current image; (3) compare Etmp with Emax and Emin and correct Etmp to obtain the optimal exposure time Ex that should be used when capturing the next frame of image, and then return to step (2). The invention realizes the dynamic adjustment of the exposure time of the camera in motion, so that the camera adapts to the changes in the surrounding environment of the smart car moving at high speed, and continuously adjusts the optimal exposure with the change of time and environment, so that the image clarity obtained by the camera is significantly improved .

Description

technical field [0001] The invention belongs to the field of automatic driving, and relates to an image perception and image processing module in automatic driving or safety assisted driving, in particular to a method for adjusting dynamic exposure of a camera in automatic driving. Background technique [0002] The camera is one of the most commonly used sensors in an automatic driving system or a safety assisted driving system. Under normal circumstances, the automatic driving system analyzes the images captured by the camera to achieve the purpose of perceiving the surrounding environment and assisting driving safety. [0003] In order to ensure that the camera in the smart car can obtain a good quality image, it is necessary to adjust many parameters of the camera. Among the many parameters of the camera, exposure is a very important parameter. If the image is too bright and overexposed or too dark or underexposed, it will greatly affect the reading and analysis of imag...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235
CPCH04N23/741H04N23/73
Inventor 王军德陈振兴甘怡训
Owner WUHAN KOTEI INFORMATICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com