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.

(b)

Optimization level	Watermarked image	Retrieved watermark
Four middle frequency coefficients for embedding watermark