Research Article
An Efficient Image Watermarking Method Based on Fast Discrete Cosine Transform Algorithm
Table 5
Processing time comparison in DSP and in PC of the watermarking method.
(a) |
| Optimization level | Clocks (cycle) | Time (s) | Code size (KB) |
| 0 | 154,645,548 | 0.89 | 26 | 1 | 112,044,218 | 0.61 | 29 | 2 | 59,152,281 | 0.35 | 43 | 3 | 57,149,130 | 0.33 | 44 | PC with Matlab | N.A. | 1.60 | N.A. |
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(b) |
| Optimization level | Watermarked image | Retrieved watermark | ā |
| Four middle frequency coefficients for embedding watermark | | | ā |
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