Weighted modulated secret image sharing method

bstract. We present a novel hybrid method that includes a moduated scheme for reducing the distortion of the reconstructed image nd a two-layered structure for grouping participants with different eights in a secret image sharing problem. Conventional secret imge sharing methods suffer from truncation distortion, which is the ifference between a pixel value and its truncated result. We first resent a histogram modulation scheme to modulate the truncated ixels to prevent the truncation distortion. A two-layer secret image haring scheme groups the participants in the first layer and weights hem differently in the second layer. The proposed modulated secret mage sharing method merges these two schemes. Experimental esults reveal that the proposed method efficiently reduces the trunation distortion and groups the participants with different possessng weights. © 2009 SPIE and IS&T. DOI: 10.1117/1.3268362