GV LDK 400, Руководство пользователя

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Introduction | Features 1-2
1.1.2 Digital Processing
The advanced digital processing of the camera is based on 14-bit A/D 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 video RGB signals via an extended
dynamic range contour circuit.
A special Studio Mode provides the opportunity for capturing even higher quality
images with outstanding signal-to-noise ratios. This mode is especially useful in
environments where light levels and dynamic range are well controlled.
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.
1.1.3 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.
1.2 Features
• Three 2/3-inch switchable DPM FT sensors ensure no vertical smear.
• DPM Frame Transfer sensors with 1000 horizontal pixels in 4:3 and 16:9 aspect
ratios, and the same number of vertical lines in both formats. No change in
horizontal viewing angle - so no optical wide angle convertors required.
• 14-bit digital processing with unique software programmable video path.
• Excellent signal-to-noise ratio (typically 65 dB).
• Superior all digital highlight handling with a wide dynamic range.
• Unique circuitry for pivoting knee and True Colour Knee.
• Wide range of presets and variable 6-point digital matrix assure accurate colour
matching.