Issue No.02 - February (1974 vol.23)
T.H. Morrin , IBM Advanced System Development Division Laboratory
A hardware-implemented algorithm combining dynamic thresholding and edge detection allows black-white representation of gray-scale images for computer storage. The output resembles a highly detailed sketch, with resolution and contrast superior to a halftone representation. The same algorithm can be applied to text and line drawings, so that all three types of images can be stored using the same compression algorithm.
Dynamic thresholding, edge detection, image compression, image storage.
T.H. Morrin, "A Black-White Representation of a Gray-Scale Picture", IEEE Transactions on Computers, vol.23, no. 2, pp. 184-186, February 1974, doi:10.1109/T-C.1974.223883