An algorithm of visual odometer based on average gradient

2019 ◽  
Author(s):  
Caihong Chen ◽  
Yonglu He ◽  
Kunling Li ◽  
Kezhu Tao ◽  
Xuexi Yuan ◽  
...  
Keyword(s):  
Average Gradient ◽  
Visual Odometer

scholarly journals Visual odometer method based on improved ORB feature

2021 ◽  
Vol 1920 (1) ◽  
pp. 012110
Author(s):  
Xiaonan Wang ◽  
Feifei Liu ◽  
Yaxin Xue
Keyword(s):  
Visual Odometer

Improved Visual Odometer Based on Two-stream Convolutional Neural Networks

2021 ◽  
Author(s):  
Yuchen Zhou ◽  
Guan Lu ◽  
Xi Chen ◽  
Yiming Xu ◽  
Li Wang
Keyword(s):  
Neural Networks ◽  
Convolutional Neural Networks ◽  
Visual Odometer

scholarly journals A Trajectory-Based Approach to Multi-Session Underwater Visual SLAM Using Global Image Signatures

2019 ◽  
Vol 7 (8) ◽  
pp. 278 ◽  
Author(s):  
Antoni Burguera Burguera ◽  
Francisco Bonin-Font
Keyword(s):  
Feature Matching ◽  
Computational Cost ◽  
Visual Slam ◽  
Single Session ◽  
Search Region ◽  
Loop Detector ◽  
Localization And Mapping ◽  
Single Link ◽  
Random Sample Consensus ◽  
Visual Odometer

This paper presents a multi-session monocular Simultaneous Localization and Mapping (SLAM) approach focused on underwater environments. The system is composed of three main blocks: a visual odometer, a loop detector, and an optimizer. Single session loop closings are found by means of feature matching and Random Sample Consensus (RANSAC) within a search region. Multi-session loop closings are found by comparing hash-based global image signatures. The optimizer refines the trajectories and joins the different maps. Map joining preserves the trajectory structure by adding a single link between the joined sessions, making it possible to aggregate or disaggregate sessions whenever is necessary. All the optimization processes can be delayed until a certain number of loops has been found in order to reduce the computational cost. Experiments conducted in real subsea scenarios show the quality and robustness of this proposal.

A Study of the Effect of Standard Laboratory Processing on Speed and Resolution of Three Black and White Aerial Films

1983 ◽  
Vol 37 (1) ◽  
pp. 3-10
Author(s):  
E. A. Fleming ◽  
M. Landreville ◽  
E. Nagy
Keyword(s):  
Type A ◽  
The Other ◽  
Small Scale ◽  
High Contrast ◽  
Aerial Photo ◽  
Standard Laboratory ◽  
Average Gradient ◽  
Black And White ◽  
Contrast Range ◽  
Film Speed

Three aerial films were tested using standard aerial photo laboratory processing procedures for three different chemistries. Relationships were established with respect to average gradient, speed, base plus fog, graininess and resolution for low, medium and high contrast targets. The films compared were Kodak Double-X type 2405, Kodak Plus-X type 2402 and Kodak Panatomic-X 2412. The processing was done in a Kodak Versamat processor using Type A, 885 and Versaflo chemistry. The results indicated that processing in 885 chemistry enhanced film speed. The versatility of Double-X in terms of speed and contrast range was demonstrated, however the resolution of Panatomic-X greatly exceeded that of either of the other two films and shows promise for small scale mapping photography.

scholarly journals Minimizing finite sums with the stochastic average gradient

2016 ◽  
Vol 162 (1-2) ◽  
pp. 83-112 ◽  
Author(s):  
Mark Schmidt ◽  
Nicolas Le Roux ◽  
Francis Bach
Keyword(s):  
Average Gradient ◽  
Stochastic Average ◽  
Finite Sums
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