ZOM

Zoom, aspect ratio converter and pan & scan processor

ZOM is Digital Vision’s aspect ratio converter and pan & scan processor primarily targeted for multi-format
releases. Programmable on a frame-by-frame basis with subpixel resolution of scale and position controls, the ZOM is ideal for pan & scan applications. Re-positioning and re-blanking controls provide additional functionality for SDTV cut-outs from an HDTV source.

Key features

• High quality field or frame-based filtering
• Independent horizontal and vertical scaling between 0.33 and 4.0
• Sub-pixel positioning
• Re-positioning
• Re-blanking
• Aliasing control
• Available in SD and HD RGB formats
• Superior performance

The ZOM uses advanced filtering techniques developed by Digital Vision. This results in the highest picture quality in all aspects. In addition, the sharpness/aliasing of down-sized pictures can be balanced using separate horizontal and vertical filter controls.

The Valhall Control System gives access to the full feature set of the ZOM and programmable, frame
accurate control including dynamic changes of scaling and positioning.

Scaling and positioning

Separate H- and V-scaling is provided between 0.33 and 4.0. The two controls can be locked together providing zoom functionality. Sub-pixel positioning, both horizontal and vertical, is available in all aspects including 1.0 with a resolution down to 1/32 of a pixel/line ensuring smooth transitions in all situations. A special preview mode, especially suited for pan & scan processes, can be enabled for up-sized pictures.

Re-positioning

A typical application is to zoom out the picture and take an SDTV cut-out of an HDTV signal. The ZOM pro-
vides independent H/V re-positioning controls with 1pixel resolution, allowing the down-sized picture to be
positioned anywhere on the screen.

Re-blanking

Separate upper, lower, left and right blanking can be added on top of the output picture. The re-blanking can
be locked to follow the re-position controls or remain at its set position. In addition, the blanking colour can be set with RGB or YUV values to provide other colours than black. This can serve as a warning if the picture might have been positioned too far in one direction.

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