Machine Learning Approach for Object Detection - A Survey Approach by ijcsis


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									                                                          (IJCSIS) International Journal of Computer Science and Information Security,
                                                          Vol. 8, No. 7, October 2010

                  Machine Learning Approach for Object
                     Detection - A Survey Approach
                     N.V. Balaji                                                               Dr. M. Punithavalli
      Department of Computer Science, Karpagam                                  Department of Computer Science, Sri Ramakrishna
                    University,                                                           Arts College for Women,
                  Coimbatore, India.                                                          Coimbatore, India.

Abstract---Object detection is a computer technology related to            recently due to emerging applications which are not only
computer vision and image processing to determine whether or               challenging but also computationally more demanding. These
not the specified object is present, and, if present, determine the        applications include data mining, document classification,
locations and sizes of each object. Depending on the machine               financial forecasting, organizing and retrieval of multimedia
learning algorithms, we can divide all object detection methods as         databases, and biometrics and also the other fields where the
Generative Methods and Discriminative Methods. The concept of              need of the image detection is high.
object detection is being an active area of research and it is
rapidly emerging since it is used in many areas of computer
vision, including image retrieval and video surveillance. This
paper presents a general survey which reviews the various
techniques for object detection and brings out the main outline of
object detection. The concepts of image detection are discussed in
detail along with examples and description. The most common &
significant algorithms for object detection are further discussed.
In this work an overview of the existing methodologies and
proposed techniques for object detection with future ideas for the
enhancement are discussed.
    Keywords---Object Detection, Support Vector Machine, Neural
Networks, Machine Learning.

                      I.   INTRODUCTION                                            Figure 1. Description for the Image Detection
    Extracting a feature vector of a given object and object
detection using the feature vector using pattern matching
                                                                               The recognition problem is being posed as a classification
technique is the main goal for object detection [2]. Object
                                                                           task, where the classes are either defined by the system
detection is to determine whether or not the object is present,
                                                                           designer or are learned based on the similarity of patterns.
and, if present, determine the locations and sizes of each
                                                                           Interest in the area of object detection has been renewed
                                                                           recently due to emerging applications which are not only
    The most common approaches are image feature                           challenging but also computationally more demanding. These
extraction, feature transformation and machine learning where              applications include data mining, document classification,
image feature extraction is to extract information about objects           financial forecasting, organizing and retrieval of multimedia
from raw images.                                                           databases, and biometrics and also the other fields where the
                                                                           need of the image detection is high.
    Classification of patterns, object identification and its
description, are important tribulations to be concentrated upon
                                                                                               II.   LITERATURE SURVEY
in a variety of engineering and scientific disciplines such as
biology, psychology, medicine, marketing, computer vision,                     Extraction of a reliable feature and improvement of the
artificial intelligence, and other remote sensing. Watanabe [1]            classification accuracy have been among the main tasks in
defines a pattern as opposite of a chaos, that is, it is an entity,        digital image processing. Finding the minimum number of
vaguely defined and that could be given a name. For instance,              feature vectors, which represent observations with reduced
a pattern could be a fingerprint image, a handwritten cursive              dimensionality without sacrificing the discriminating power of
word, a human face, or a speech signal. Given a pattern, the               pattern classes, along with finding specific feature vectors, has
object detection may consist of one of the following two tasks             been one of the most important problems in the field of pattern
[2] either the supervised classification in which the input                analysis.
pattern is identified as a member of a predefined class or the                 In the last few years, the problem of recognizing object
unsupervised classification, which the pattern is assigned to a            classes received growing attention in both variants of whole
previously unknown class.                                                  image classification and object localization. The majority of
    The recognition problem is being posed as a classification             existing methods use local image patches as basic features [3].
task, where the classes are either defined by the system                   Although these work well for some object classes such as
designer or are learned based on the similarity of patterns.               motor-bikes and cars, other classes are defined by their shape
Interest in the area of object detection has been renewed                  and therefore better represented by contour features.

                                                                                                       ISSN 1947-5500
                                                         (IJCSIS) International Journal of Computer Science and Information Security,
                                                         Vol. 8, No. 7, October 2010

    In many real world applications such as pattern                       to carry out the generative task The problem of sophistication
recognition, data mining, and time-series prediction, we often            the construction of a Bayesian network is known to be NP-
confront difficult situations where a complete set of training            Hard, and therefore it is restricted to the structure of the
sample is not given when constructing a system. In face                   concluding network to a known form of arrangement to gain
recognition, for example, since human faces have large                    tractability.
variations due to expressions, lighting conditions, makeup,
hairstyles, and so forth, it is hard to consider all variations of             The initial phase is to mine feature information from the
face in advance.                                                          object. Schneider man has discussed by using three level
                                                                          wavelet transform to convert the contribution image to spatial
    In many cases, training samples are provided only when a              occurrence in sequence. One then constructs a set of
system misclassifies objects; hence the system is learned                 histograms in both position and intensity. The concentration
online to improve the classification performance. This type of            values of each wavelet layer need be quantized to fit into an
learning is called incremental learning or continuous learning,           inadequate number of bins. One difficulty encountered in the
and it has recently received a great attention in many practical          premature execution of this method was the lacking of high
applications.                                                             power regularity information in the objects. With a linear
                                                                          quantization scheme the higher energy bins had primarily
    In pattern recognition and data mining, input data often              singleton values, this leads to a problem when a prior is
have a large set of attribute. Hence, the informative input               introduced to the bin, as the actual count values are lost in the
variables (features) are first extracted before the classification        introduced prior. To extract this exponential quantization
is carried out. This means that when constructing an adaptive             technique was employed to spread the power evenly between
classification system, we should consider two types of                    all the bin levels.
incremental learning: one is the incremental feature extraction,
and the other is incremental learning classifiers.                        D.    Cluster-Based Object Detection
A. A hybrid object detection technique                                        The cluster based object detection was proposed by Rikert,
                                                                          Jones, and Viola [8]. In this methodology, the information
    As discussed by M.        Paul et. al., in [9] the adaptive           about the object is learned and used for classification. The
background modeling based object detection techniques are                 objects are transformed and then build a mixture of Gaussian
widely used in machine vision applications for handling the               model. The transformation is done based on the result of k-
challenges of real-world multimodal background. But they are              means clustering applied to the transformed object. In the
forced to detailed environment due to relying on environment              initial pace the object is distorted using a multi-directional
precise parameters, and their performances also alter across              steer able pyramid. The result of the pyramid is then compiled
dissimilar operating speeds. The basic background calculation
                                                                          into a succession of quality vectors self-possessed of the
is not appropriate for real applications due to manual                    foremost coat deposit pixel, and the pixels from higher in
background initialization prerequisite and its incapability to            pyramid resized without interruption. For reasonably sized
switch cyclical multimodal background. It shows better                    patches this quickly becomes intractable.
firmness across different operating speeds and can better
abolish noise, shadow, and trailing effect than adaptive                  E. Rapid Object Detection using a Boosted Cascade of
techniques as no model adaptability or environment related                    Simple Features
parameters are involved. The hybrids object detection                         Paul Viola et. al., describe in [11], as a machine learning
technique for incorporating the strengths of both approaches.             approach for object detection which is capable of processing
In this technique, Gaussian mixture models is used for                    images tremendously rapid and achieving high detection rates.
maintaining an adaptive background model and both                         This work is illustrious by three key contributions. The initial
probabilistic and basic subtraction decisions are utilized for            is the prologue of an original object representation called the
scheming reasonably priced neighbor hood statistics for                   integral object which allows the features used by the detector
guiding the final object detection decision.                              to be computed very quickly. The author developed a learning
B. Moving Object Detection Algorithm                                      algorithm, based on Ada Boost, which selects a small number
                                                                          of critical visual features from a superior set and yields
    Zhan Chaohui et. al., projected in [10], the first point in
                                                                          enormously efficient classifiers [12]. The third contribution is
moving object detection algorithm is the block-based motion
                                                                          a method for combining increasingly more complex classifiers
assessment is used to attain the common motion vectors, the
                                                                          in a “cascade” which allows background regions of the object
vectors for every block, where the central pixel of the block is
                                                                          to be quickly discarded while spending more calculation on
considered as the enter crucial point. These motion vectors are
                                                                          showing potential object-like regions. The flow can be viewed
used to sense the border line blocks, which contain the border
                                                                          as an object specific focus of concentration mechanism which
of the object. Presently on, the linear exclamation is used to
                                                                          dissimilar to preceding approaches that provides statistical
make the coarse motion field an impenetrable motion field, by
                                                                          guarantees that superfluous regions are improbable to contain
this way to eliminate the chunk artifacts. This possession can
                                                                          the object of interest.
also be used to sense whether the motion field is uninterrupted
or not. This sophisticated impenetrable motion field is used to           F. Template Matching Methods
define detail limitations in each boundary block. Thus the                    Huang T.S et. al., described the template matching
moving object is detected and coded.                                      methods that uses standard patterns of objects and the object
C. Restricted Bayesian networks                                           parts to portray the object globally or as diverse parts.
                                                                          Correlations get struck between the input image and patterns
   This approach presented by Schneiderman et. al., in [4, 5,
                                                                          subsequently computed for detection. Gavrila [16] proposed
6 and 7] attempts to study the structure of a Bayesian network
                                                                          an object detection scheme that segments forefront regions

                                                                                                      ISSN 1947-5500
                                                       (IJCSIS) International Journal of Computer Science and Information Security,
                                                       Vol. 8, No. 7, October 2010

and extracts the boundary. Then the algorithm searches for              images. They define a reduced set of regions that covers the
objects in the image by matching object features to a database          image support and that spans various levels of resolution.
of templates. The matching is realized by computing the                 They are attractive for object detection as they enormously
average Chamfer detachment amid the template and the edge               reduce the search space. In [23], several issues allied to the use
map of the target image area. Wren et al. [18] described                of BPT for object detection are examined. Analysis in the
detailed on a top-down person detector based on template-               compromise between computational complexity reduction and
matching. However, this approach requires field specific scene          accuracy in accordance with the construction of binary tree
analysis.                                                               lead us to define two parts in BPT: one providing the accuracy
                                                                        and the other representing the search space for the task of
G. Object Detection Using Hierarchical MRF and MAP                      object detection. In turn, it includes an analysis and
    Estimation                                                          objectively compares various similarity measures for the tree
    Qian R.J et. al., projected this method in [15] which               construction. This different similarity criterion should be used
presents a new scale, position and direction invariant approach         for the part providing accuracy in the BPT and for the part
to object detection. The technique initially chooses                    defining the search space. Binary Partition Tree concentrates
concentration on regions in an object based on the region               in a compact and structured representation of meaningful
detection consequence on the object. Within the attention               regions that can be extracted from an image. They offer a
regions, the method then detects targets that combine template          multi-scale representation of the image and define the
matching methods with feature-based methods via hierarchical            translation invariant 2-connectivity rule among regions.
MRF and MAP estimation. Hierarchical MRF and MAP
inference supply a stretchy framework to integrate various              K. Statistical Object Detection Using Local Regression
visual clues. The amalgamation of template corresponding and                Kernels
feature detection helps to accomplish robustness against                    This novel approach was proposed by Hae Jong Seo and
multifaceted backgrounds and fractional occlusions in object            Peyman Milanfar in [24] to the problem of detection of visual
detection.                                                              similarity between a template image and patches in the given
                                                                        image. The method is based on the computation of the local
H. Object Detection and Localization using Local and                    kernel of the template, which measures the likeness of a pixel
    Global Features                                                     to its surroundings. This kernel is then used as a descriptor
    The work proposed by Kevin Murphy et. al., in [21]                  from which features are extracted and compared against
describes more advanced method of object detection and                  analogous features from the target image. Comparison of the
localization using local and global features of an image.               features extracted is carried out using canonical correlations
Traditional approaches to object detection only look at the             analysis. The overall algorithm yields a scalar resemblance
local pieces of the image, whether it can be within a sliding           map (RM). This resemblance map indicates the statistical
window or the regions around an interest point detector. When           likelihood of similarity between a given template and all target
this object of interest is small or the imaging conditions are          patches in an image. Similar objects with high accuracy can be
otherwise unfavorable, such local pieces of the image can               obtained by performing statistical analysis on the resulting
become indistinct. This ambiguity can be reduced by using               resemblance map. This proposed method is robust to various
global features of the image – which we call as a “gist” of the         challenging conditions such as partial occlusions and
scene. The object detection rates can be significantly improved         illumination change.
by combining the local and global features of the image. This
method also results in large increase of speed as well since the        L. Spatial Histogram based Object Detection
gist is much cheaper to compute than the local detectors.                   Hongming Zhang et. al., describes in [25], that feature
                                                                        extraction plays a major role for object representation in an
I.   Object Detection from HS/MS and Multi-Platform Remote              Automatic object detection system. The spatial histogram
    Sensing Imagery                                                     preserves the object texture and shape simultaneously as it
     Bo Wu, put forth a technique in [22] that integrates         contains marginal distribution of image over local patches. In
biologically and geometrically inspired approaches to detect            [25], methods of learning informative features for spatial
objects from hyperspectral and/or multispectral (HS/MS),                histogram-based object detection were proposed. Fisher
multiscale, multiplatform imagery. First, dimensionality                criterion is employed to measure the discriminability of the
reduction methods are studied and implemented for                       spatial histogram feature and calculates features correlations
hyperspectral dimensionality reduction. Then, a biologically            using mutual information. An informative selection algorithm
stimulated method S-LEGION (Spatial-Locally Excitatory                  was proposed in order to construct compact feature sets for
Globally Inhibitory Oscillator Network) is developed for                efficient classification. This informative selection algorithm
object detection on the multispectral and dimension reduced             selects the uncorrelated and discriminative spatial histogram
hyperspectral data. This method provides rough object shapes.           features and this proposed method is efficient in object
Geometrically inspired method, GAC (Geometric Active                    detection.
Contour), is employed for refining object boundary detection
on the high resolution imagery based upon the initial object            M. Recursive Neural Networks for Object Detection
shapes provided by S-LEGION.                                                 M. Bianchini et. al., put forth an algorithm in [26], a new
                                                                        recursive neural network model for object detection. This
J.   Binary Partition Tree for Object Detection                         algorithm is capable of processing directed acyclic graphs
    This proposal suggested by V. Vilaplana et. al., in [23],           with labeled edges, which address the problem of object
discusses the use of Binary Partition Tree (BPT) for object             detection. The preliminary step in an object detection system
detection. BPTs are hierarchal region based representation of           is the detection. The proposed method describes a graph-based

                                                                                                    ISSN 1947-5500
                                                        (IJCSIS) International Journal of Computer Science and Information Security,
                                                        Vol. 8, No. 7, October 2010

representation of images that combines both spatial and visual           learning or continuous learning. This problem is to introduce
features. The adjacency relationship between two                         Incremental Linear Discriminant Analysis as the feature
homogeneous regions after segmentation can be determined                 extraction technique to object detection and hence improving
by the edge between the two nodes. This edge label collects              the classification performance to the great height.
information on their relative positions, whereas node labels
contain visual and geometric information on each region (area,               The overall outcome of the proposed work is to implement
color, texture, etc). These graphs are then processed by the             a variation in the existing feature extraction system LDA and
recursive model in order to determine the eventual presence              to develop a new system ILDA which increases the
and the position of objects inside the image. The proposed               classification performance to a great height. Also the system
system is general and can be employed to any object detection            should take new samples as input online and learn them
systems, since it does not involve any prior knowledge on any            quickly. As a result of this incremental learning process, the
particular problem.                                                      system will have a large set of samples learned and hence will
                                                                         decrease the chance of misclassifying an object.
N. Object Detection Using a Shape Codebook
    Object detection by Xiaodong Yu et. al., in [27], presents a                                 IV.     CONCLUSION
method for detecting categories of object in real world images.              This paper attempts to provide a comprehensive survey of
The ultimate aim is to localize and recognize instances in the           research on object detection and to provide some structural
training images of an object category. The main contribution             categories for the methods described. When appropriately
of this work is a novel structure of the shape code-book for             considered, it is been reported that, on the relative
object detection. The code book entry consists of two                    performance of methods in so doing, it needs the awareness
components: a shape codeword and a group of associated                   that there is a lack of uniformity in how methods are evaluated
vectors that specify the object centroids. The shape codeword            and so it is reckless to overtly state that which methods indeed
is such that it can be easily extracted from most image object           have the lowest error rates. As a substitution, it can be urged
categories. A geometrical relationship between the shape                 to the members of the community to expand and contribute to
codeword is stored by the associated vectors. The                        test sets and to report results on already available test sets. The
characteristics of a particular object category can be specified         community needs to more seriously considered for systematic
by the geometrical relationship.                                         performance evaluation. This would allow users and the
    Triple-Adjacent-Segments (TAS), extracted from image                 researchers of the object detection algorithms to identify
edges is used as a shape codeword. Object detection is carried           which ones are aggressive in which particular domain. It will
out in a probabilistic voting framework. This proposed method            also prompt researchers to produce truly more effective object
has drastically lower complexity and requires noticeably less            detection algorithms.
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                                                                                                           ISSN 1947-5500
                                                                     (IJCSIS) International Journal of Computer Science and Information Security,
                                                                     Vol. 8, No. 7, October 2010

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                                AUTHORS PROFILE

                      N.V. Balaji has obtained his Bachelor of Science in
                      Computer Science from Sri Ramasamy Naidu Memorial
                      College, Sattur in 1997 and Master of Science in
                      Computer Science from Dr. GRD College of Science in
                      1997. Now he is doing Ph.D., in Bharathiar University.
                      He commences more than nine years of experience in
                      teaching field moreover industrial experience in Cicada
                      Solutions, Bangalore. At present he is working as Asst.
Professor & Training Officer at Karpagam University. His research interests
are in the area of Image Processing and Networks. He presented number of
papers in reputed national and international journals and conferences.

                      Dr. M. Punithavalli received the Ph.D degree in
                      Computer Science from Alagappa University, Karaikudi
                      in May 2007. She is currently serving as the Adjunct
                      Professor in Computer Application Department, Sri
                      Ramakrishna Engineering College, Coimbatore. Her
                      research interest lies in the area of Data mining, Genetic
                      Algorithms and Image Processing. She has published
                      more than 10 Technical papers in International, National
Journals and conferences. She is Board of studies member various
universities and colleges. She is also reviewer in International Journals. She
has given many guest lecturers and acted as chairperson in conference.
Currently 10 students are doing Ph.D., under her supervision.

                                                                                                                ISSN 1947-5500

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