{"product_id":"compression-of-digital-holograms-of-three-dimensional-objects-von-alison-shortt","title":"Compression of digital holograms of three-dimensional objects","description":"\u003cp\u003eThe white-noise appearance of digital holograms has led researchers to exclusively employ uniform quantisation as a quantisation compression technique. During my research, I designed novel, and adapted conventional, iterative and non-iterative lossy nonuniform quantisation techniques, and completed the compression process by subsequently applying lossless coding. To quantify performance I combined an RMS metric computed in reconstruction space and compression ratio computed in digital hologram space. I show how iterative techniques (k-means, Kohonen  competitive neural network, Kohonen self-organising map, and  annealed Hopfield neural network) successfully exploit  correlations between real and imaginary components of the digital holograms. Non-iterative techniques (companding, histogram  quantisation, optimal quantisation, and wavelets) combine a  uniform quantisation grid with nonuniform transformations of the  grid and hologram data to trade reconstruction quality for speed.  Finally, recognising the importance of security in data  transmission, the resilience of encrypted digital holograms to quantisation is evaluated.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783846517673\"\u003e\u003ch3\u003eusing nonuniform iterative and non-iterative techniques\u003c\/h3\u003e\u003c\/div\u003e","brand":"Autorenwelt Shop","offers":[{"title":"Softcover - 9783846517673","offer_id":39494514704477,"sku":"9783846517673","price":79.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/69dcdad9-c208-4d07-8e0f-6d52632b0552.jpg?v=1757827307","url":"https:\/\/shop.autorenwelt.de\/products\/compression-of-digital-holograms-of-three-dimensional-objects-von-alison-shortt","provider":"Autorenwelt Shop","version":"1.0","type":"link"}