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DNA MicroArray Image Processing Case Study 1.0

  Date Added: April 25, 2013  |  Visits: 222

DNA MicroArray Image Processing Case Study

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In one type of gene expression analysis, fluorescently tagged messenger RNA from different cells are hybridized to a microscopic array of thousands of complimentary DNA spots that correspond to different genes. Illuminated spots emit different color light, indicating which genes are expressed (e.g., green=control, red=sample, yellow=both).In this case study, MATLAB, the Image Processing and Signal Processing toolboxes were used to determine the green intensities from a small portion of a microarray image containing 4,800 spots. A 10x10 pattern of spots was detected by averaging rows and columns to produce horizontal and vertical profiles. Periodicity was determined automatically by autocorrelation and used to form an optimal length filter for morphological background removal. A rectangular grid of bounding boxes was defined. Each spot was individually addressed and segmented by thresholding to form a mask. The mask was used to isolate each spot from surrounding background. Individual spot intensity was determined by integrating pixel intensities. Finally, integrated intensities were tabulated and saved to a data file for subsequent statistical analysis to determine which genes matter most.With the MATLAB code and example image in this package you can follow the steps used for this application.

Requirements: No special requirements
Platforms: Matlab
Keyword: Addressed Autocorrelation Automatically Background Bounding Boxes Defined Determined Filter Horizontal Individually Length Morphological Optimal Periodicity Produce Profiles Rectangular Removal Vertical
Users rating: 0/10

License: Freeware Size: 4.35 MB
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