“Display of Two-Dimensional Functions Using Grey Scale Simulated on a Bi level Display” by Judice

  • ©C. N. Judice




    Display of Two-Dimensional Functions Using Grey Scale Simulated on a Bi level Display

Session/Category Title: Hardware Session




    A technique is described for displaying functions of two independent variables on a matrix of bilevel display cells. The function value is associated with an n-level grey scale which is simulated by the ordered dither processing technique. Using only one cell per coordinate pair, ordered dither gives the subjective effect of grey scale through the appropriate spatial arrangement of on and off cells. Aside from subjective advantages, this technique executes much faster and requires considerably less memory than conventional contouring or 3-D perspective methods when the function is given as a large matrix array.


    1. K. Knowlton and L. Harmon, “Computer-Produced Grey Scales,” Computer Graphics and Image Processing, 1, pp. 1–20 (1972).
    2. David L. Fulton, “A Spatial Gray Scale for Plasma Display Panels,” SID Symposium, Digest of Papers, pp. 20–21 (1973).
    3. C. N. Judice, J. F. Jarvis, and W. H. Ninke, “Using Ordered Dither to Display Continuous Tone Pictures on an AC Plasma Display,” Proc. of SID, 4th Quarter 1974, p. 161.
    4. n² = 2ͫ where m = 0,1,2,..∞
    5. Goodall, W. W., “Television by Pulse Code Modulation,” BSTJ, 30, No. 1, (January 1951), pp. 33–49.
    6. Limb, J. O., “Design of Dither Wave-forms for Quantized Visual Signals,” BSTJ, 48, No. 7 (September 1969), pp. 2555–2582.
    7. B. Lippel and M. Kurland, “The Effect of Dither on Luminance Quantization of Pictures,” IEEE Transactions on Communications Technology, 6, pp. 879–888, (1971).
    8. B. E. Bayer, “An Optimum Method for Two-Level Rendition of Continuous-Tone Pictures,” Int. Conf. on Comm., Conf. Record, pp. (26-11)–(26-15), (1973).
    9. F. D. Tappert and C. N. Judice, “Recurrence of Nonlinear Ion Acoustic Waves,” Phys. Rev. Letters, Vol. 29, (1972).

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