Transactions on Machine Intelligence

Transactions on Machine Intelligence

Brain Tumor Segmentation in MRI Images Using Transform Domain Methods

Document Type : Original Article

Authors
A. AshamiPour 1
H. Yarahmadi 2
J. Mohammadzadeh 2
1 Department of Computer Science, Buin Zahra Branch, Islamic Azad University, Buin Zahra, Iran
2 Assistant Professor, Department of Computer Science, Buin Zahra Branch, Islamic Azad University, Buin Zahra, Iran
10.47176/TMI.2019.221
Abstract
Image segmentation techniques are widely used in medical imaging to isolate homogeneous regions. To date, no complete image segmentation method has been presented that can yield satisfactory results for imaging applications such as brain MRI, brain cancer detection, and others. This study presents a method for brain tumor segmentation in MRI images using transform domain methods and contourlets. First, a multi-resolution representation of the input image is created using the contourlet transform. Then, an 8-dimensional feature vector is extracted for each pixel using inter-resolution and intra-resolution data. The final feature vector's dimensions are reduced using Principal Component Analysis (PCA). Finally, the feature vectors are grouped into discrete clusters for segmentation. The proposed method was implemented on brain images using MATLAB software. The algorithm is computationally simple, yet efficient for brain tumor segmentation in MRI images. Using the eight subbands, as opposed to the conventional wavelet transform that extracts coefficients in only three directions, helps us better identify directional details in the image. Additionally, the use of eight directional features for each pixel allows the extracted details in different subbands to be enhanced in accordance with the direction, making maximal use of the subband correlation. The proposed method does not suffer from the region overlapping problem of active contour methods and can detect the internal areas of large regions. Overall, the proposed algorithm improves performance by six percent compared to the active contour method and by one percent compared to the two-dimensional feature extraction method using wavelet transform.
Keywords
Segmentation
MRI Image
Contourlet
Brain Tumor
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Transactions on Machine Intelligence
Volume 2, Issue 4
Autumn 2019
Pages 221-234

  • Receive Date 04 August 2019
  • Revise Date 26 October 2019
  • Accept Date 16 December 2019