Real-World Interaction with Camera Phones

Rohs, Michael

doi:10.1007/11526858_7

Cited by 107 publications

(71 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite the simplicity of the range camera image acquisition, the automatic extraction of the objects of interest, namely the (Otsu, 1979), eccentricity classification (Rohs, 2005) and the boundary point removal with image erosion. The specific procedure for target measurement extraction is to refer (Qi and Lichti, In press).…”

Section: Target Measurement Extractionmentioning

confidence: 99%

Dynamic Concrete Beam Deformation Measuremnet With 3d Range Cameras

Lichti

2012

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

ABSTRACT:Concrete beams are used to construct bridges and other structures. Due to the traffic overloading or the decaying state of structures, deformation of bridges or other structures occurs frequently. Therefore, the requirement to measure concrete beam deformation, as integral components of structures, is well recognized. Many imaging techniques such as digital cameras, laser scanners and range cameras have been proven to be accurate and cost-effective methods for large-area measurement of deformation under static loading conditions. However, for obtaining useful information about the behaviour of the beams or monitoring real-time bridge deformation, the ability to measurement deformation under dynamic loading conditions is also necessary. This paper presents a relatively low-cost and high accuracy imaging technique to measure the deformation of concrete beams in response to dynamic loading with range cameras. However, due to the range camera measurement principle, target movement could lead to motion artefacts that degrade range measurement accuracy. The results of simulated and real-data investigation into the motion artefacts show that the lower sampling frequency leads to the more significant motion artefact. The results from real data experiments have indicated that periodic deformation can be recovered with sub-millimetre accuracy when the 3 Hz and 4 mm amplitude target motion is sampled at a rate of least 20 Hz and with 31 MHz range camera modulation frequency. When the modulation frequency is 29 MHz, the best sampling frequency is 20 Hz to keep the error under sub-millimetre.

show abstract

Section: Target Measurement Extractionmentioning

confidence: 99%

Dynamic Concrete Beam Deformation Measuremnet With 3d Range Cameras

Lichti

2012

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

show abstract

“…Rohs [9] divided incoming frames into the fixed number of blocks and then determined the relative x, y, and rotational motion using a simple block matching technique in order to to interact with an RFID tag. Another possibility is to extract distinctive features such as edges and corners from images which exist naturally in the scene.…”

Section: Related Workmentioning

confidence: 99%

Camera-Based Motion Recognition for Mobile Interaction

Hannuksela

Barnard

Sangi

et al. 2011

ISRN Signal Processing

View full text Add to dashboard Cite

Multiple built-in cameras and the small size of mobile phones are underexploited assets for creating novel applications that are ideal for pocket size devices, but may not make much sense with laptops. In this paper we present two vision-based methods for the control of mobile user interfaces based on motion tracking and recognition. In the first case the motion is extracted by estimating the movement of the device held in the user's hand. In the second it is produced from tracking the motion of the user's finger in front of the device. In both alternatives sequences of motion are classified using Hidden Markov Models. The results of the classification are filtered using a likelihood ratio and the velocity entropy to reject possibly incorrect sequences. Our hypothesis here is that incorrect measurements are characterised by a higher entropy value for their velocity histogram denoting more random movements by the user. We also show that using the same filtering criteria we can control unsupervised Maximum A Posteriori adaptation. Experiments conducted on a recognition task involving simple control gestures for mobile phones clearly demonstrate the potential usage of our approaches and may provide for ingredients for new user interface designs.

show abstract

“…At present, seven 2D-barcodes are used for camera phone applications among them. These are: QR Code [3], VeriCode [4], Data Matrix [5], mCode [6], Visual Code [7], ShotCode [8] and ColorCode [9]. Fig.…”

Section: D-barcodes For Camera Phone Applicationsmentioning

confidence: 99%

“…1). We encoded an identical set of data in the first 2 samples in 2 different symbol sizes 6 and repeated the same operation using another identical set of data 7 . Since some 2D-barcodes only encode URL, we used 2 different URLs as our test data: a short and a long URL.…”

Section: First Read Rate (Frr) Analysismentioning

confidence: 99%

First read rate analysis of 2D-barcodes for camera phone applications as a ubiquitous computing tool.

Kato

Tan

2007

TENCON 2007 - 2007 IEEE Region 10 Conference

View full text Add to dashboard Cite

Abstract-This paper presents a detailed study on the first read rate (FRR) of seven 2D-barcodes currently used for camera phone applications. The study revealed a few surprising observations. Through our analysis, we identified three key factors to improve the robustness of 2D-barcode reading, the range of the reading distance and the stability of the readers. This will contribute to the widespread use of 2D-barcode mobile technology as a ubiquitous computing tool.

show abstract

Real-World Interaction with Camera Phones

Abstract: Abstract

Cited by 107 publications

References 4 publications

Dynamic Concrete Beam Deformation Measuremnet With 3d Range Cameras

Dynamic Concrete Beam Deformation Measuremnet With 3d Range Cameras

Camera-Based Motion Recognition for Mobile Interaction

First read rate analysis of 2D-barcodes for camera phone applications as a ubiquitous computing tool.

Contact Info

Product

Resources

About