Abstract
A new algorithm which uses tree based decision and tri-state non linear values to eliminate high density outlier noise in mammogram images is proposed. The proposed algorithm uses the number of non noisy pixels in the current processing vicinity as values in the decision tree. Tri-state values such as unsymmetrical truncated median or modified Winsorized mean or midpoint replaces the corrupted pixel based on the decision tree in the current processing kernel. The algorithm exhibits good PSNR, IEF, low MSE and High structural preservation property even after removing high density noise. The performance of the proposed algorithm was also found good visually. The Key aspect of the work is the combination of tree based decision and tri-state non linear values which preserves the information content of images that are required for further processing.
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Abbreviations
- DBA:
-
Decision based algorithm
- SPN:
-
Salt and pepper noise removal
- PSNR:
-
Peak signal to noise ratio
- MSE:
-
Mean square error
- IEF:
-
Image enhancement factor
- SSIM:
-
Structural similarity index metric
- SMF:
-
Standard median filter
- AMF:
-
Adaptive median filter
- PSMF:
-
Progressive switched median filter
- IDBA:
-
Improved decision based median filter
- CUTMF:
-
Cascaded unsymmetrical trimmed median filter
- CUTMPF:
-
Cascaded unsymmetrical trimmed midpoint filter
- MDBUTMF:
-
Modified decision based unsymmetrical trimmed median filter
- DBUTMPF:
-
Decision based unsymmetrical trimmed midpoint filter
- DBSIF:
-
Decision based spline interpolation filter
- TSF:
-
Trisate filter (proposed algorithm)
- X:
-
Probability density function
- Sa,b :
-
Corresponding pixel of the noisy image
- K(a,b):
-
Current processing pixel
- S1(a,b):
-
Array holding sorted pixels of current processing window
- MXN:
-
Size of the image
- x:
-
Original image
- y:
-
Restored image
- n:
-
Corrupted image
- count:
-
Number of non noisy pixels in the current processing window
- μx:
-
Average of the original image
- μy:
-
Average of the restored image
- L:
-
Dynamic range of pixel value
- σx:
-
Standard deviation of the original image
- σy:
-
Standard deviation of the restored image
- i:
-
Kernel size of original image
- j:
-
Kernal size of the restored image
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Varatharajan declares that he has no conflict of interest. Vasanth Kishorebabu declares that he/she has no conflict of interest.
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Articles do not contain studies with human participants or animals by any of the authors. Images used in the work are stored in database given in website given in reference 30.The images used in the database can be used for research.
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Ramachandran, V., Kishorebabu, V. A Tri- State Filter for the Removal of Salt and Pepper Noise in Mammogram Images. J Med Syst 43, 40 (2019). https://doi.org/10.1007/s10916-018-1133-0
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DOI: https://doi.org/10.1007/s10916-018-1133-0