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Digital video image converter
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Inventors: Farley, Shal W.; McCown, William;
Assignee: Video Animation Systems, Inc. (Burbank, CA)
Primary Examiner: Britton; Howard W.
Assistant Examiner:
Attorney, Agent or Firm: Lyon & Lyon
Each horizontal line of a high-resolution video image signal, input in an image format having a plurality of pixels of a predetermined resolution, is subjected to anti-alias filtering to produce a smooth analog signal with limited bandwidth. The smooth analog signal is sampled by an A/D converter and converted to an image format with different resolution from the original image signal, but without discarding all the information from any input pixel. Each converted horizontal line is matched, pixel by pixel, with successive and preceding horizontal lines, and subjected to a weighted averaging process to produce an output image with different vertical resolution from the original image signal, again without discarding all the information from any input pixel. |
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DETAILED DESCRIPTION Each horizontal line of a high-resolution video image signal, input from a graphics computer or other similar source in a format having a plurality of pixels of a predetermined resolution, is subjected to anti-alias filtering to produce a smooth analog signal with limited bandwidth.
The smooth analog signal is sampled by an A/D converter and converted to a format having a different resolution from the original signal, but without discarding all the information from any input pixel (i.
e.
using at least some information from each input pixel).
Each converted horizontal line is matched, pixel by pixel, with successive and preceding converted horizontal lines, and subjected to a weighted averaging process to produce an output signal having a different vertical resolution from the original signal, again using at least some information from each input pixel.
Without limiting the generality of the invention, output image signals may differ in aspect ratio from input image signals.
As the input image signal is "holisticly" transformed into the output image signal, an input image with one aspect ratio may be transformed into an output image with a differing aspect ratio.
There is no requirement that transformations of aspect ratio must be in small integer ratios.
Without limiting the generality of the invention, a further advantage is provided by conversion of input data, in a graphic image format such as RGB, into broadcast image format such as NTSC when the image signal is first input.
The NTSC image format is more compact than RGB (although it has less color resolution), so conversion of a broadcast image format from one resolution to another is less expensive because there is less information to process.
Without limiting the generality of the invention, line buffers are provided to reorder data from a line by line representation of a signal in a broadcast image format into a multiple data stream format more suited to averaging of multiple horizontal scan lines.
Data may be reordered to allow averaging over multiple horizontal scan lines, so that averaging of multiple horizontal scan lines may achieve vertical compression
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