GRASS VALLEY LDK 4000 ELITE -, Руководство пользователя

Страница: 16 / 122

16 LDK 8000 Elite/4000 Elite System camera User’s Guide (v1.01)
Chapter 1 - Introduction
1.2 Technology
1.2.1 HD imagers
The camera head uses HD-DPM
+
™ CCD imagers which offer superior performance and
ultimate flexibility. Native high-definition video formats 1080p (LDK 8000 Elite Worldcam
only), 1080i and 720p are produced at the touch of a button.
Progressive frame sampling is the native imaging mode, providing complete frame
samples. The entire imager surface is used for image sampling—there are no interline
transfer channels which introduce aliasing artifacts.
The camera’s native multi-format capability is realized with innovative 9.2 million pixel
Frame Transfer 2/3-inch CCD imagers. These allow vertically grouping of different numbers
of pixels on the imagers themselves—there is no need for internal format conversion.
These imagers have a high dynamic range and high linear sensitivity across all camera
lens apertures. Unique imager shuttering completely eliminates vertical smear.
1.2.2 Digital processing
The advanced digital processing of the camera is based on 14-bit A/D converters and 34-
bit accurate internal processing. All major camera functions are processed in the digital
domain, including knee, gamma, detail, matrix and color correction.
The intelligent continuous automatics function provides automatic control of black levels
and black shading. Each imager provides black reference signals that are used to monitor
temperature changes. This means that continuous automatic correction is applied without
operator intervention.
The digital detail processing uses full amplitude video RGB signals via an extended
dynamic range detail 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 standardized
gamma curves and enable soft contrast in black scenes to be enhanced, together with
hard contrast and saturated color in bright scenes. The matrix and gamma sequence is
software programmable for precise color matching.
1.2.3 Focus assist
With HD, focusing is even more critical than before. The LDK 8000 Elite/4000 Elite has
special patented focusing aids. A unique viewfinder zoom function enlarges the
viewfinder image instantly with a simple press-button action, thus providing improved
means for focusing.
Additionally, a patented crawler circuitry adds motion in the viewfinder to objects in sharp
focus.