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A methodology for extracting standing human bodies from single images
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A METHODOLOGY FOR EXTRACTING STANDING HUMAN
BODIES FROM SINGLE IMAGES
By
A
PROJECT REPORT
Submitted to the Department of electronics &communication Engineering in the
FACULTY OF ENGINEERING & TECHNOLOGY
In partial fulfillment of the requirements for the award of the degree
Of
MASTER OF TECHNOLOGY
IN
ELECTRONICS &COMMUNICATION ENGINEERING
APRIL 2016
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CERTIFICATE
Certified that this project report titled “A Methodology for Extracting Standing Human
Bodies From Single Images” is the bonafide work of Mr. _____________Who carried out the
research under my supervision Certified further, that to the best of my knowledge the work
reported herein does not form part of any other project report or dissertation on the basis of
which a degree or award was conferred on an earlier occasion on this or any other candidate.
Signature of the Guide Signature of the H.O.D
Name Name
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DECLARATION
I hereby declare that the project work entitled “A Methodology for Extracting Standing
Human Bodies From Single Images” Submitted to BHARATHIDASAN UNIVERSITY in
partial fulfillment of the requirement for the award of the Degree of MASTER OF APPLIED
ELECTRONICS is a record of original work done by me the guidance of Prof.A.Vinayagam
M.Sc., M.Phil., M.E., to the best of my knowledge, the work reported here is not a part of any
other thesis or work on the basis of which a degree or award was conferred on an earlier occasion
to me or any other candidate.
(Student Name)
(Reg.No)
Place:
Date:
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ACKNOWLEDGEMENT
I am extremely glad to present my project “A Methodology for Extracting Standing Human
Bodies From Single Images” which is a part of my curriculum of third semester Master of
Science in Computer science. I take this opportunity to express my sincere gratitude to those who
helped me in bringing out this project work.
I would like to express my Director,Dr. K. ANANDAN, M.A.(Eco.), M.Ed., M.Phil.,(Edn.),
PGDCA., CGT., M.A.(Psy.)of who had given me an opportunity to undertake this project.
I am highly indebted to Co-OrdinatorProf. Muniappan Department of Physics and thank from
my deep heart for her valuable comments I received through my project.
I wish to express my deep sense of gratitude to my guide
Prof. A.Vinayagam M.Sc., M.Phil., M.E., for her immense help and encouragement for
successful completion of this project.
I also express my sincere thanks to the all the staff members of Computer science for their kind
advice.
And last, but not the least, I express my deep gratitude to my parents and friends for their
encouragement and support throughout the project.
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ABSTRACT:
Segmentation of human bodies in images is a challenging task that can facilitate numerous
applications, like scene understanding and activity recognition. In order to cope with the highly
dimensional pose space, scene complexity, and various human appearances, the majority of
existing works require computationally complex training and template matching processes. We
propose a bottom-up methodology for automatic extraction of human bodies from single images,
in the case of almost upright poses in cluttered environments. The position, dimensions, and
color of the face are used for the localization of the human body, construction of the models for
the upper and lower body according to anthropometric constraints, and estimation of the skin
color. Different levels of segmentation granularity are combined to extract the pose with highest
potential. The segments that belong to the human body arise through the joint estimation of the
foreground and background during the body part search phases, which alleviates the need for
exact shape matching. The performance of our algorithm is measured using 40 images (43
persons) from the INRIA person dataset and 163 images from the “lab1” dataset, where the
measured accuracies are 89.53% and 97.68%, respectively. Qualitative and quantitative
experimental results demonstrate that our methodology outperforms state-of-the-art interactive
and hybrid top-down/bottom-up approaches.
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INTRODUCTION:
Extraction of the human body in unconstrained still images is challenging due to several factors,
including shading, image noise, occlusions, background clutter, the high degree of human body
deformability, and the unrestricted positions due to in and out of the image plane rotations.
Knowledge about the human body region can benefit various tasks, such as determination of the
human layout ,recognition of actions from static images ,and sign language recognition Human
body segmentation and silhouette extraction have been a common practice when videos are
available in controlled environments, where background information is available, and motion can
aid the segmentation through background subtraction. In static images,
However, there are no such cues, and the problem of silhouette extraction is much more
challenging, especially when we are considering complex cases. Manuscript received March 3,
2014; revised July 29, 2014 and December 24, 2014; accepted January 4, 2015. Date of
publication February 24, 2015; date of current version May 13, 2015. This paper was
recommended by Associate Editor Y. Yuan. The authors are with the Department of
Engineering, Wright State University, Dayton, OH 45435 USA .Color versions of one or more of
the figures in this paper are available online Digital Object Identifier
10.1109/THMS.2015.2398582 Moreover, methodologies that are able to work at a frame level
can also work for sequences of frames, and facilitate existing methods for action recognition
based on silhouette features and body skeletonization.
In this study, we propose a bottom-up approach for human body segmentation in static images.
We decompose the problem into three sequential problems: Face detection, upper body
extraction, and lower body extraction, since there is a direct pairwise correlation among them.
Face detection provides a strong indication about the presence of humans in an image, greatly
reduces the search space for the upper body, and provides information about skin color. Face
dimensions also aid in determining the dimensions of the rest of the body, according to
anthropometric constraints. This information guides the search for the upper body, which in turns
leads the search for the lower body. Moreover, upper body extraction provides additional
information about the position of the hands, the detection of which is very important for several
applications.
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The basic units upon which calculations are performed are super pixels from multiple levels of
image segmentation. The benefit of this approach is twofold. First, different perceptual groupings
reveal more meaningful relations among pixels and a higher, however, abstract semantic
representation. Second, a noise at the pixel level is suppressed and the region statistics allow for
more efficient and robust computations. Instead of relying on pose estimation as an initial step or
making strict pose assumptions, we enforce soft anthropometric constraints to both search a
generic pose space and guide the body segmentation process. An important principle is that body
regions should be comprised by segments that appear strongly inside the hypothesized body
regions and weakly in the corresponding background.
The general flow of the methodology can be seen in Fig. 1. The major contributions of this study
address upright and not occluded poses. 1) We propose a novel framework for automatic
segmentation of human bodies in single images. 2) We combine information gathered from
different levels of image segmentation, which allows efficient and robust computations upon
groups of pixels that are perceptually correlated. 3) Soft anthropometric constraints permeate the
whole process and uncover body regions. 4) Without making any assumptions about the
foreground and background, except for the assumptions that sleeves are of similar color to the
torso region, and the lower part of the pants is similar to the upper part of the pants, we structure
our searching and extraction algorithm based on the premise that colors in body regions appear
strongly inside these regions (foreground) and weakly outside
(background).
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CONCLUSION:
We presented a novel methodology for extracting human bodies from single images. It is a
bottom-up approach that combines information from multiple levels of segmentation in order to
discover salient regions with high potential of belonging to the human body. The main
component of the system is the face detection step, where we estimate the rough location of the
body, construct a rough anthropometric model, and model the skin’s color. Soft anthropometric
constraints guide an efficient search for the most visible body parts, namely the upper and lower
body, avoiding the need for strong prior knowledge, such as the pose of the body. Experiments
on a challenging dataset showed that the algorithm can outperform state-of-the-art segmentation
algorithms, and cope with various types of standing everyday poses.
However, we make some assumptions about the human pose, which restrict it from being
applicable to unusual poses and when occlusions are strong. In the future, we intend to deal with
more complex poses, without necessarily relying on strong pose prior. Problems like missing
extreme regions, such as hair, shoes, and gloves can be solved by incorporation of more masks in
the search for these parts, but caution should be taken in keeping the computational complexity
from rising excessively
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REFERENCES:
[1] S. Li, H. Lu, and L. Zhang, “Arbitrary body segmentation in static images,”Pattern Recog.,
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[2] L. Huang, S. Tang, Y. Zhang, S. Lian, and S. Lin, “Robust human body segmentation based
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