Cursor location error minimizing system

Details Cursor location error minimizing system Cursor location error minimizing system

G - Physics

08

C

375/11, 354/222

G08C 21/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1103377

ABSTRACT There is disclosed a method and means for increasing the positional accuracy of operator controlled cursors engaged in the digitized encoding of graphic information such as line drawings. The method steps comprise those of digitizing the instantaneous contact position between the cursor and the data entry surface as reference coordinates detecting any segment of a colored object upon the surface within a predetermined area about the cursor; ascertaining the location within the area of the centroid or the like of the detected segment; and digitizing said ascertained location as a displacement from the reference coordinates. Apparatus for practicing the method comprise an indepen- dently actuable cursor formed from a position encoder and an image scanner, the scanner generating a Boolean coded array of points counterpart to a preselected surface area The scanned array is first buffered and then used to actuate an operator viewable LED di-play of the scanned array on one hand and said array is sent to CPU on the other hand. In turn, the CPU calculates the coordinates of the centroid of that array area of contiguous points having the same de-lgnatod 8001ean Icolor) 0 or 1 value Signals represent- ing tho calcul-ted coordlnate- generated by the CPU then cause the LED dlsplay ~o differentlally lndicate ths calculated centrold location to the operator such as by way of a fla-hlng di~play ele~ent

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