GRASS VALLEY LDK 5490, User Manual

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Introduction HD video mode 1-5
is achieved without the need for anamorphic lenses while maintaining
full 1920 x 1080 resolution. There is no need to crop the image or
lose resolution to get this aspect ratio.
Digital video processing
The advanced digital video processing of the camera is based on 12-
bit AD converters and more than 22-bit internal processing. Two
DSPs combine all major camera functions in the digital domain,
including knee, gamma, contour, matrix and colour correction.
The intelligent continuous automatics facility provides automatic
control of black levels and black shading. Each sensor provides black
reference signals that are used to monitor temperature changes. This
means that continuous automatic correction is applied without
operator intervention.
The digital contour processing uses full amplitude 400% video RGB
signals via an extended dynamic range contour circuit. Colorimetry
is selected by means of a variable 6-point digital matrix or via preset
matrices. Digital gamma circuits provide a wide range of standardised
gamma curves and enable soft contrast in black scenes to be
enhanced, together with hard contrast and saturated colour in bright
scenes. The matrix and gamma sequence is software programmable
for precise colour matching.
Film-like characteristics
The pivoting knee circuit adapts both the knee point and the
compression ratio according to the highlight content of the picture
to emulate the softly limiting S-shaped transfer characteristics of film.
Digital True Colour Knee circuitry maintains the correct hue for
compressed highlights, reproducing colours faithfully, even
overexposed skin tones.
Digital contrast circuitry provides a black stretch function for more
detail in black areas and a black press function for improving the
contrast impression by simulating the S-curve of film.