  We introduced a new kind of patterns named Special-Hadamard patterns, which
could be used as structured illuminations of computational ghost imaging.
Special-Hadamard patterns can get a better image quality than Hadamard patterns
in a noisy environment. We can completely reconstruct the original object in a
noiseless environment by using Special-Hadamard patterns, and the size of
object also can be adjusted arbitrarily, these advantages cannot be achieved by
other common patterns. We also performed simulations to compare the results of
Special Hadamard patterns with the results of Hadamard patterns. We found
Special Hadamard patterns can greatly improve the image quality of
computational ghost imaging.
