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An Empirical Approach for Medical Diagnosis Using Image Segmentation and Shape Analysis

Umed Singh1, Narender Singh2
  1. M.Tech Student, Dept. of CSE, GITM, Bilaspur, Kurukshetra University, Haryana, India
  2. Head of the Department, Dept of CSE, GITM, Bilaspur, Kurukshetra University, Haryana, India
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Abstract

An image is an array, or a matrix, of square pixels (picture elements) arranged in columns and rows. The goal of image segmentation is to cluster pixels into salient image regions, i.e., regions corresponding to individual surfaces, objects, or natural parts of objects. The segmentation could be used for object recognition, occlusion boundary estimation within motion or stereo systems, image compression, image editing, or image database look-up. Image processing plays a key role in computer aided diagnosis and medical practice. . Shape analysis plays an important role in feature extraction and analysis. In this paper a technique is proposed to detect anaemic erythrocytes using image segmentation and shape parameters.





Keywords

Segmentation, Mean Shift, Thresholding, Anaemia.

INTRODUCTION

Image segmentation is the process of dividing an image into multiple parts. This is typically used to identify objects or other relevant information in digital images. It is the process by which an image is subdivided into its different parts. Level of segmentation is depends on the level of requirement of objects. Segmentation has two objectives. The first objective is to decompose the images into parts for further analysis. The second objective of segmentation is to perform a change of representation. The pixels of the image must be organized into higher-level units that are either more meaningful or more efficient for further analysis (or both). A shape parameter is a set function value of which does not depend on geometrical transformation such as translation, rotation, size changes and reflection. Statistical shape analysis is a geometrical analysis from a set of shapes in which statistics are measured to describe geometrical properties from similar shapes or different groups [2].

II. LITERATURE REVIEW

Dorin Comaniciu et al proposed the general nonparametric technique for the analysis of complex multimodal feature space and to delineate arbitrarily shaped clusters in it. The basic computational module of the technique is an old pattern recognition procedure, the mean shift. In this the convergence of recursive mean shift procedure to the nearest stationary point of the underlying density function is proved for discrete data. An algorithm for image segmentation is described as an application[11]. Michael Breuß et al provide a review of shape analysis methods. Shape analysis methods play an important role in systems for object recognition, matching, registration, and analysis. Research in shape analysis has been motivated, in part, by studies of human visual form perception systems. Several theories of visual form perception are briefly mentioned. Shape analysis methods are classified into several groups. Classification is determined according to the use of shape boundary or interior, and according to the type of result. An overview of the most representative methods is presented. D. Karakuş et al, in their paper, detection of size and shape of minerals are considered important for the information about minerals. Different size and shape of same mineral can be effective in classification of them. Therefore it is necessary to know the size and shape of mineral exactly. In this study, using possibilities of image processing techniques in the detection of shape and size of mineral was discussed and a sample study was carried out. According to this successful results can be obtained about size and shape features of minerals by using image processing technique especially in thin section images whose third dimension effect was decreased[8].

III. SEGMENTAION

Pyramid segmentation uses a color merge (over a scale that depends on the similarity of the colors to one another in order to segment images. This approach is based on minimizing the total energy in the image;[2] here energy is defined by a link strength, which is further defined by color similarity. mean shift finds the peak of a color-spatial (or other feature) distribution over time. mean-shift segmentation finds the peaks of color distributions over space. Given a set of multidimensional data points whose dimensions are (x, y, blue, green,red), mean shift can find the highest density “clumps” of data in this space by scanning a window over the space. However, that the spatial variables (x, y) can have very different ranges from the color magnitude ranges (blue, green, red). [2] Therefore, meanshift needs to allow for different window radii in different dimensions. In this case weshould have one radius for the spatial variables (spatial Radius) and one radius for the color magnitudes (color Radius). As mean-shift windows move, all the points traversed by the windows that converge at a peak in the data become connected or “owned” by that peak. This ownership, radiating out from the densest peaks, forms the segmentation of the image. In Mean Shift Filtering() we have an input image src and an output image dst.Both must be 8-bit, three-channel color images of the same width and height. The spatial Radius and color Radius defi ne how the mean-shift algorithm averages color and space together to form a segmentation. For a 640-by-480 color image, it works well to set spatial Radius equal to 2 and color Radius equal to 40. The next parameter of this algorithm is max_level, which describes how many levels of scale pyramid you want used for segmentation. A max_level of 2 or 3 works well for a 640-by-480 color images.
Otsu's method is used to automatically perform histogram shape-based image threasholding, or, the reduction of a graylevel image to a binary image. The algorithm assumes that the image to be threshold [1] contains two classes of pixels or bi-modal histogram (e.g. foreground and background) then calculates the optimum threshold separating those two classes so that their combined spread (intra-class variance) is minimal.

IV. PROBLEM STATEMENT

Shape analysis plays an important role in feature extraction and analysis .A methodology has been proposed which segment the images using mean shift technique and otus’s method is used for binarization. It extracts contours of the objects present in the images using chain code. The contour further is used to evaluate shape parameters. Contour tracing helps in shape analysis. Contour tracing is one of many preprocessing techniques performed on digital images in order to extract information about their general shape.

V. PROPOSED TECHNIQUE AND THE FLOW

The mean-shift algorithm runs as follows.

1. Choose a search window:
• its initial location;
• its type (uniform, polynomial, exponential, or Gaussian);
• its shape (symmetric or skewed, possibly rotated, rounded or rectangular);
• its size (extent at which it rolls off or is cut off ).
2. Compute the window’s (possibly weighted) centre of mass.
3. Centre the window at the centre of mass.
4. Return to step 2 until the window stops moving (it always will).

VI. ANTICIPATED TECHNICAL IMPLEMENTATION AND APPROACH

 The proportional analysis on various segmentation techniques and shape parameters.
 Design of a new algorithmic approach towards medical diagnosis.
 Implementation of the improved and efficient algorithm on the images of RBC- normal as well as abnormal.
 Relative study of the results with the existing techniques and generation of the detailed reports
 Acceptance and trust level of the hypothesis and objectives specified in the research proposal
 Framing out the conclusion and future work from the implementation performed and results fetched

VII. SIMULATION RESULTS

We have segmented various images by using the Mean-Shift Segmentation. The collective representation of the extracted parameters is shown in Table 1. Shape analysis of different RBCs have been done using segmentation technique as shown in fig1.
Contour plays an important role. Once the contour of a given pattern is extracted, it's different characteristics will be examined and used as features which will later on be used in cell classification. The contour pixels are generally a small subset of the total number of pixels representing a pattern. Therefore, the amount of computation is greatly reduced when we run feature extracting algorithms on the contour instead of on the whole pattern. The current methodology works in different phases, First of all it segments the image then binarization and then successfully extract the contours and thus shape parameters, we test the methodology for the analysis and classification of RBC cells. With this classification, we can easily find out the blood disorders and diagnose them. Sometimes structural changes occur in RBCs that indicate a possible pathological condition. In this paper a new technique is proposed to diagnose the disease anemia by applying this technique on Red Blood Cell images.

Tables at a glance

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Table 1
 

Figures at a glance

Figure 1 Figure 2 Figure 3 Figure 4
Figure 1 Figure 2 Figure 3 Figure 4

References