... separate video output, YB-YR-Y color difference signal output.2, the output imaging system consists of: ... test patterns include: round, 8-level grayscale, 16-level grayscale, color stripes, multiple frequencies, RY ... , anti-white, black and white box, grid lines, grid points, centerline, and the color purity ... gray scale, 8-order linear grayscale and 16-order linear gray scale7, multiple frequencies of ...