50 research outputs found
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Human hand posture detection and recognition is a challenging problem in computer vision. We introduce an algorithm that is capable to recognize hand posture in a sophisticated background. The system combines two algorithms to achieve better detection rate for hand. Recently Viola et al. in have introduced a rapid object detection scheme; we use this approach to detect the hand posture in the first set of consecutive frames. The chromatic color distribution of skin can be found within this cluster. As the shape of hand posture keep changing in the subsequent frames, the skin regions updated dynamically. The classification of hand posture makes use of static feature for locating and counting hand fingers. Kalman Filter is used to track the face and hand blobs based on their position. In the experiments, we have tested our system in various environments, and results showed effectiveness of the approach
A color hand gesture database for evaluating and improving algorithms on hand gesture and posture recognition
With the increase of research activities in vision-based hand posture and gesture
recognition, new methods and algorithms are being developed. Although less attention is
being paid to developing a standard platform for this purpose. Developing a database of
hand gesture images is a necessary first step for standardizing the research on hand gesture
recognition. For this purpose, we have developed an image database of hand posture and
gesture images. The database contains hand images in different lighting conditions and
collected using a digital camera. Details of the automatic segmentation and clipping of the
hands are also discussed in this paper
Feature extraction: hand shape, hand position and hand trajectory path
Vision-based hand posture detection and tracking is an important issue for Human to Computer Interaction applications. The performance of recognition system fIrst depends on the process of getting effIcient features to represent pattern characteristics [1]. There is no
algorithm which shows how to select the representation or choose the features [2] so the selection of features will depend on the application. There are many different methods to represent 2-D images such as boundary, topological, shape grammar, description of similarity etc. [2-4]. Features should be chosen so that they are intensive to noise-like variation in pattern and keep the number of feature small for easy computation [5]. Hand posture shape
features, motion trajectory feature and hand position with respect to other human upper body parts play an important role within the preparation stage of the gesture before recognition. In this chapter, features have been extracted from hand posture closed contours, hand posture trajectory and hand position has been identifIed. Algorithms have been developed for extracting these features after segmenting the head and the two hands. These extracted features can be attached to a recognizer such as Support Vector machine, Hidden Markov Model, etc. for hand gesture recognition
Modelling and correcting for the impact of the gait cycle on touch screen typing accuracy
Walking and typing on a smartphone is an extremely common interaction. Previous research has shown that error rates are higher when walking than when stationary. In this paper we analyse the acceleration data logged in an experiment in which users typed whilst walking, and extract the gait phase angle. We find statistically significant relationships between tapping time, error rate and gait phase angle. We then use the gait phase as an additional input to an offset model, and show that this allows more accurate touch interaction for walking users than a model which considers only the recorded tap position
Dynamic approach for real-time skin detection
Human face and hand detection, recognition
and tracking are important research areas for many computer
interaction applications. Face and hand are considered
as human skin blobs, which fall in a compact region of
colour spaces. Limitations arise from the fact that human
skin has common properties and can be defined in various
colour spaces after applying colour normalization. The
model therefore, has to accept a wide range of colours,
making it more susceptible to noise. We have addressed
this problem and propose that the skin colour could be
defined separately for every person. This is expected to
reduce the errors. To detect human skin colour pixels and
to decrease the number of false alarms, a prior face or hand
detection model has been developed using Haar-like and
AdaBoost technique. To decrease the cost of computational
time, a fast search algorithm for skin detection is proposed.
The level of performance reached in terms of detection
accuracy and processing time allows this approach to be an
adequate choice for real-time skin blob tracking
Intuitive Hand Teleoperation by Novice Operators Using a Continuous Teleoperation Subspace
Human-in-the-loop manipulation is useful in when autonomous grasping is not
able to deal sufficiently well with corner cases or cannot operate fast enough.
Using the teleoperator's hand as an input device can provide an intuitive
control method but requires mapping between pose spaces which may not be
similar. We propose a low-dimensional and continuous teleoperation subspace
which can be used as an intermediary for mapping between different hand pose
spaces. We present an algorithm to project between pose space and teleoperation
subspace. We use a non-anthropomorphic robot to experimentally prove that it is
possible for teleoperation subspaces to effectively and intuitively enable
teleoperation. In experiments, novice users completed pick and place tasks
significantly faster using teleoperation subspace mapping than they did using
state of the art teleoperation methods.Comment: ICRA 2018, 7 pages, 7 figures, 2 table
The impact of geometric and motion features on sign language translators
Malaysian Sign Language (MSL) recognition system is a choice of augmenting communication
between the hearing-impaired and hearing communities in Malaysia. Automatic translators can play an
important role as alternative communication method for the hearing people to understand the hearing impaired
ones. Automatic Translation using bare hands with natural gesture signing is a challenge in the field of machine
learning. Researchers have used electronic and coloured gloves to solve mainly three issues during the preprocessing
steps before the singingsโ recognition stage. First issue is to differentiate the two hands from other
objects. This is referred to as hand detection. The second issue is to describe the detected hand and its motion
trajectory in very descriptive details which is referred to as feature extraction stage. The third issue is to find the
starting and ending duration of the sign (transitions between signs). This paper focuses on the second issue, the
feature extraction by studying the impact of the vector dimensions of the features. At the same time, signs with
similar attributes have been chosen to highlight the importance of featuresโ extraction stage. The study also
includes Hidden Markov Model (HMM) capability to differentiate between signs which have similar attributes
Dynamic approach for real-time skin detection
Human face and hand detection, recognition
and tracking are important research areas for many computer interaction applications. Face and hand are considered as human skin blobs, which fall in a compact region of
colour spaces. Limitations arise from the fact that human
skin has common properties and can be defined in various
colour spaces after applying colour normalization. The
model therefore, has to accept a wide range of colours,
making it more susceptible to noise. We have addressed
this problem and propose that the skin colour could be
defined separately for every person. This is expected to
reduce the errors. To detect human skin colour pixels and
to decrease the number of false alarms, a prior face or hand
detection model has been developed using Haar-like and
AdaBoost technique. To decrease the cost of computational
time, a fast search algorithm for skin detection is proposed.
The level of performance reached in terms of detection
accuracy and processing time allows this approach to be an
adequate choice for real-time skin blob tracking
Features-based moving objects tracking for smart video surveillances: A review
Video surveillance is one of the most active research topics in the computer vision due to the increasing need for security. Although surveillance systems are getting cheaper, the cost of having human operators to monitor the video feed can be very expensive and inefficient. To overcome this problem, the automated visual surveillance system can be used to detect any suspicious activities that require immediate action. The framework of a video surveillance system encompasses a large scope in machine vision, they are background modelling, object detection, moving objects classification, tracking, motion analysis, and require fusion of information from the camera networks. This paper reviews recent techniques used by researchers for detection of moving object detection and tracking in order to solve many surveillance problems. The features and algorithms used for modelling the object appearance and tracking multiple objects in outdoor and indoor environment are also reviewed in this paper. This paper summarizes the recent works done by previous researchers in moving objects tracking for single camera view and multiple cameras views. Nevertheless, despite of the recent progress in surveillance technologies, there still are challenges that need to be solved before the system can come out with a reliable automated video surveillance