A High Quality, Fast Inverse Halftoning Algorithm for Error Diffused Halftones


We present an inverse halftoning algorithm for error di#used halftones. At each pixel, the algorithm applies a separable 7 # 7 FIR #lter parameterized by the horizontal and vertical edge strengths computed from the local gradients. The algorithm requires entirely local operations, storage of 7 rows, and fewer than 300 arithmetic operations#pixel. The algorithm can be easily implemented in embedded software or hardware. We compare our algorithm with previously reported approaches to show that it delivers comparable PSNR and subjective quality at a fraction of the computation and memory requirements. A C implementation of the algorithm is available at http:##www.ece.utexas.edu#~bevans# projects#inverseHalftoning.html

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