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INTRODUCTION
1.1.
General Introduction
VP-794 is a very flexible image scalers developed specifically for driving large screen displays such as
Projectors and LED videowalls in multiple screen applications from video or graphics sources.
VP-794 features the ability to switch between two internal sets of firmware, one optimised for Projection
soft edge blend and warp and the other optimised for LED walls.
VP-794 features a state of the art digital image processors which provide market leading HD & SD per-
pixel multiple Iow-angle motion-adaptive de-interlacing and automatic film 3:2 and 2:2 pull-down
correction, significantly outperforming the capabilities of benchmark competitor products.
VP-794 features excellent image processing algorithms for the very best scaling, film and video noise
reduction and MPEG artefact reduction.
VP-794 uses a very flexible high performance video input front end including true component video
support in analog YPbPr and RGBS formats and 3GSDI, HDSDI, SDI digital formats as well as
composite (CVBS) and YC/S-Video inputs.
A very high performance video decoder is utilised with 4x oversampling and 3D Y/C separation for
outstanding video image clarity.
HDMI and DVI video with HDCP encryption is also supported, as are computer graphics inputs in SVGA
analog and HDMI/DVI digital formats.
The output format can be set to I/O Lock mode where it locks the output frame rate to the input frame
rate dynamically without frame rate conversion so as to reduce system latency, or it can be set to a fixed
output frame rate for driving basic screens which are not 50Hz-compatible.
A Low latency mode with non-motion adaptive reduced processing is available to further reduce latency.
The output format can also be set to lock to an externally provided synchronization signal.
Outputs are available in VGA analog and DVI digital formats as well as 3GSDI serial digital formats
which are useable simultaneously so that one output can drive the screen while the other runs a local
monitor.
Note for the SDI output: Not all PC output formats are supported by 3GSDI standards in which case the
3GSDI output is disabled. Also note that if an HDCP encrypted signal is connected to the HDMI or DVI
input, the DVI output signal will be similarly HDCP encrypted and the outputs that cannot be encrypted
(VGA analog and the 3GSDI output) will be disabled.
Interlaced outputs are supported, there is a vertical temporal filter facility which greatly reduces interlace
flicker.
VP-794
supports Pan, Tilt and Zoom to select a ‘region of interest’ portion of the input image, fill the
screen and pan and tilt within it.
VP-794 by default is designed to drive projectors, in which case warp and soft edge blend features are
available allowing adjustment for images to be rotated, tilted or optimised for flat and curved screens
VP-794 can also be operated in a mode to drive LED videowalls in this mode it provides output window
size control down to minimum pixel count to fit a single LED videowall module at 128x96 pixels. The
output window can be positioned anywhere within the chosen output resolution.
VP-794 is designed for multi screen projector and videowall installations. Auto Zoom and Edge Blend
with elaborate Black Level Uplift is provided to stitch multiple projector images together. The same
stitching is available to support LED videowalls which exceed the maximum output resolution of
1920x1200 pixels of a single VP-794.
Edge Blend (for projection applications) allows the brightness level of certain image regions to match
the brightness of overlapping areas.
Auto Zoom automatically crops and zooms the input video image to display the section of the total
image on the corresponding projector or screen.