| 摘要 |
An apparatus for monitoring a video signal comprises means (11) for receiving a video signal (X(video), Y(video), Z(video)) having X-, Y- and Z-components, means (13) for calculating a position (x(video), y(video)) having an x-axis component and a y-axis component on a xy chromaticity diagram from the video signal in accordance with a predetermined conversion formula, and means (14) for displaying the position (59). The means (14) can display a triangle (57, 58) which connects three xy-values corresponding to R-, G- and B-components, respectively, which belong to a predetermined color reference system, a range (56) on the xy chromaticity diagram which can be viewed by humans, and/or a marker (60) for a range of an xvYCC display system. The means (14) can indicates whether or not the video signal represents a color (x(video), y(video)) which is located out of a predetermined range (51-54). The xy chromaticity diagram can be transformed, for example, to a UCS chromaticity diagram. |
