Number | Date | Country | Kind |
---|---|---|---|
3341667 | Nov 1983 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3845326 | Godden | Oct 1974 | |
4393406 | Lehmann | Jul 1983 |
Number | Date | Country |
---|---|---|
0048874 | Mar 1982 | JPX |
Entry |
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R. G. Nelson, "Automatic Thresholding and Shading Circuit for Solid-State Cameras and Scanners" IBM Tech. Disclosure, vol. 17, #2, pp. 519-520, 7/74. |