| 摘要 |
A test apparatus for video signal produces a two dimensional projection of a three dimensional display of video variables. The variables can be luminance, saturation and hue; luminance, R-Y and B-Y color difference; red, blue and green amplitude; or luminance, I and Q, for example. The variables can be displayed with the R-Y and B-Y color differences on X and Y axes in a plane, with luminance on a Z axis perpendicular to the plane. The display is rotated for ease of viewing of the projection, and is preferably rotatable under operator control, in at least one axis of rotation. The axis of rotation can be in the plane of X and Y. A graticle which represents reference points in a standard vectorscope display can be superimposed on the projection. Points representing the saturation and hue phase angle of colors of a standard color bar test pattern, and graticle lines parallel to the Z axis, can also be included.
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