Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-04-30
1993-05-18
Oberley, Alvin E.
Facsimile and static presentation processing
Static presentation processing
Attribute control
340747, H04N 974
Patent
active
052125440
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to manipulating video signals in the form of a composite encoded signals, such as digitized PAL or NTSC etc encoded according to the D2 standard.
A video graphics system is disclosed in U.S. Pat. No. 4514818, assigned to the present Assignee and included herein as part of the present disclosure, in which a video image is viewed on a monitor by generating an analogue video signal from digitally stored image data. The image data may be modified by the operation of a stylus upon a touch tablet, in which movement of the stylus simulates the operation of a graphic implement such as a paintbrush, chalk or an airbrush. A machine embodying the techniques disclosed in the aforesaid patent is manufactured by the present Assignee and sold under the trade mark "PAINTBOX".
Video graphics systems are often used during the post production stages of video making, in which a clip of video is manipulated by the system (frame by frame) so that elements may be added or removed from a live action shot, or animated sequences generated. The original recordings are often in the form of composite signals, such as PAL or NTSC, which are termed composites because they may be transmitted over a single channel, the chrominance signal (hue and saturation) being frequency multiplexed above the luminance signal. However, to allow manipulation by a video graphics system, the frames must be decoded into separate components, with a baseband signal for each of the three primary colours of red, green and blue, or for each of a luminance and two colour difference signals. If so required, the component signals may be re-coded back into composite form after manipulation.
A problem which results from decoding between composite video (say PAL) and component video is that clips which undergo this process do not match perfectly with unprocessed clips. A possible solution would be to perform the decoding and re-encoding process on all of the video clips as part of the editing process, however, this is not only time consuming but also unnecessary degradation to the whole of the production.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved method and apparatus for manipulating video image signals. In particular it is an object of the invention to allow a decoded composite signal to be manipulated, re-coded and then edited with non-decoded clips while minimizing differences between the two clips.
According to the present invention there is provided a method of manipulating video image signals, comprising the steps of decoding input composite video signals to give input component signals, storing digitized pixels of said decoded component signals, modifying selected pixels of said stored signals and coding said stored component pixels to produce manipulated composite video signals; characterized by storing said input composite video signals, storing an indication of said modified pixels of said stored component signals, and producing output composite video signals by selecting from said manipulated and re-coded composite video signals or from said stored input composite video signals substantially in response to said stored indication of the modified pixels.
BRIEF DESCRIPTION OF THE DRAWING
The sole FIGURE illustrates, in block diagram form, a system embodying an example of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A system for manipulating video image signals is shown in the accompanying FIGURE, in which individual frames are played from a first digital video tape recorder DVTR1 and recorded on a second similar recorder DVTR2. The recorders sample a conventional composite video signal without demodulating it; in NTSC machines the sampling rate is 14.4 MHz conforming to a recording standard identified as D2. The recorders may form part of a conventional edit suite, in which they would be connected together; a solid line representing such a connection is not shown in the FIGURE.
The system is provided with video graphics apparatus, simil
REFERENCES:
patent: 4357624 (1982-11-01), Greenberg
patent: 4488180 (1984-12-01), Rabinowitz
patent: 4639765 (1987-01-01), D'Hont
patent: 4667222 (1987-05-01), McCoy
patent: 4707731 (1987-11-01), Ghazey
Hinson Neil R.
Kellar Paul R. N.
Stapleton Alan L.
Farnandez Kara
Oberley Alvin E.
Quantel Limited
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