公开(公告)号：CA1119287A

公开(公告)日：1982-03-02

申请号：CA310047

申请日：1978-08-25

Applicant: IBM

Inventor： GIDDINGS GARY M ,  LANGDON GLEN G JR ,  MALOWANY ALFRED S ,  WILLIAMS ROBIN

IPC: H04N5/262 ,  G06F3/14 ,  G09G5/02 ,  G09G5/377 ,  G09G5/40 ,  H04N9/43 ,  H04N9/74 ,  H04N9/75 ,  H04N9/76 ,  H04N5/22 ,  H04N9/535

Abstract: An improved video display system is provided in which two color images are combinable in a dynamic and self-determining fashion to provide improved contrast, comprehension and display versatility. Two separate video signals that are to be used in generating a single display are converted into sequences of digitally encoded picture elements (pixels). Control signals are generated that are dependent upon the data content of the elements in at least one of the sequences, and these signals are used to govern the mode of combination of the two video signals for individual pixel sets. For example a first video signal of digital character and having varying pixel intensity may be transformed into color values for a first pseudocolor display. A second video signal, derived from an analog source, is digitized and is also transformed into pseudocolor, concurrent with the dynamic generation in real time of the data dependent control signals. Such control signals may be incorporated in either or both of the digitized data sequences, and the second video signal may be digitized with or without adjustment of intensity ranges within variable limits. The two transformed digital signal sequences are then arithmetically or logically combined in accordance with the functions defined by the data dependent control signals. For example, the signals may be added, ANDed, ORed, averaged, subtracted, or one or the other can be blocked, and these functions can be varied, dependent upon the data, in incremental fashion within the display. Consequently, the contrast between the two color images can be selectively enhanced, the data contained in the images can be much more clearly depicted in graphical form, and special effects can be obtained in versatile and discretionary fashion.

公开(公告)号：DE2850117A1

公开(公告)日：1979-05-23

申请号：DE2850117

申请日：1978-11-18

Applicant: IBM

Inventor： CASEY RICHARD GEORGE ,  LANGDON JUN GLEN GEORGE ,  MANTEY PATRICK EDWARD ,  WILLIAMS ROBIN

IPC: G06F3/02 ,  G06F3/033 ,  G06F3/041 ,  G06F3/048 ,  G06F3/14 ,  G09G5/08 ,  G06K15/20 ,  G06F3/00

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 comprises an independently 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 display of the scanned array on one hand and said array is sent to a 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 designated Boolean (color) 0 or 1 value. Signals representing the calculated coordinates generated by the CPU then cause the LED display to differentially indicate the calculated centroid location to the operator such as by way of a flashing display element.