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pgmtexture - calculate textural features on a PGM image |
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pgmtexture [-d d] [pgmfile] |
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This program is part of Netpbm(1). pgmtexture reads a PGM image as input and calculates textural features based on spatial dependence matrices at 0, 45, 90, and 135 degrees for a distance d (default = 1). Textural features include: |
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Angular Second Moment |
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Contrast |
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Correlation |
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Variance |
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Inverse Difference Moment |
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Sum Average |
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Sum Variance |
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Sum Entropy |
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Entropy |
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Difference Variance |
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Difference Entropy |
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Information Measures of Correlation |
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Maximal Correlation Coefficient |
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Algorithm taken from: Haralick, R.M., K. Shanmugam, and I. Dinstein. 1973. Textural features for image classification. IEEE Transactions on Systems, Man, and Cybertinetics, SMC-3(6):610-621. |
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The program can run incredibly slow for large images (larger than 64 x 64) and command line options are limited. The method for finding the Maximal Correlation Coefficient, which requires finding the second largest eigenvalue of a matrix Q, does not always converge. |
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pgm(1), pamsharpness(1), pamsharpmap(1), pgmedge(1), pgmminkowski(1) |
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Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for hire of James Darrell McCauley. |