t = 1
t = 4
t = 9
t = 12
acquire rotational invariance.
Polygonal Approximation of Digital Curves Using ADSS
Algorithm used: P. Bhowmick and B. B. Bhattacharya, Fast Polygonal Approximation of Digital Curves Using Relaxed Straightness Properties. IEEE Transactions Pattern Analysis and Machine Intelligence (TPAMI), Vol. 29, No. 9, pp. 1590-1602, 2007.
| A test image: Bengali consonant "ka" rotated at 15o interval. |
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t = 1 |
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t = 4 |
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t = 9 |
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t = 12 |
| Observation: For an appropriate value
of t, the
polygonal approximation tends to acquire rotational invariance. |
Some Real-world Images (t = 1, 4, 8):
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