@article{discovery1417720,
            year = {2013},
           month = {November},
          number = {22},
          volume = {21},
            note = {Copyright {\copyright} 2013 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.},
           title = {Acousto-optic imaging of a color picture hidden behind a scattering layer},
           pages = {26780 -- 26785},
         journal = {Optics Express},
          author = {Leung, TS and Jiang, S},
             url = {http://dx.doi.org/10.1364/OE.21.026780},
        abstract = {An imaging technique has been developed to image a color picture hidden behind a 5 mm thick, highly scattering layer with low transmittance of 0.24\%. Small vibrations ({\ensuremath{<}} 1 um) were induced in the hidden picture, causing a time-varying speckle pattern on the scattering layer in the front, which is captured by a CCD camera and quantified as speckle contrast difference (SCD). With two lasers at 543 nm and 633 nm, the imaging system raster-scans the front of the scattering layer and the resulting SCD image reveals the color features of the hidden picture.},
            issn = {1094-4087}
}