Automatic image scanning format converter with seamless switching
First Claim
1. In a system for processing a video signal subject to exhibiting either a first image line scanning format (I) or alternatively a different second image line scanning format (P), apparatus including:
- an output processor compatible with a predetermined one of said first or second formats;
an automatic scan format converter responsive to said signals exhibiting either said first or second formats for automatically providing an output signal with a predetermined one of said first or second line scanning formats so as to be compatible with the format requirements of said output processor; and
a switching network associated with said converter for switching between said first and second formats at image frame boundaries substantially without introducing data discontinuities at said frame boundaries.
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Accused Products
Abstract
An adaptive scan format converter (14 FIG. 1; FIG. 2) at a transmitter/encoder of a video signal processing system such as a high definition television (HDTV) system, as a function of what format is desired for coding and transmission via an output channel. Similarly, at a receiver, a received scan format is automatically converted (36, FIG. 1; FIG. 2) to a desired format for display as needed. For example, a received interlaced signal (I) will be automatically converted to progressive (P) format to be compatible with a progressive scan display device (39). A received progressive signal will be passed to the display device without format conversion. Automatic scan conversion is performed seamlessly so that, for example, the conversion between progressive main television program material and interlaced commercial material is produced without artifacts and is essentially invisible to a viewer.
97 Citations
9 Claims
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1. In a system for processing a video signal subject to exhibiting either a first image line scanning format (I) or alternatively a different second image line scanning format (P), apparatus including:
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an output processor compatible with a predetermined one of said first or second formats; an automatic scan format converter responsive to said signals exhibiting either said first or second formats for automatically providing an output signal with a predetermined one of said first or second line scanning formats so as to be compatible with the format requirements of said output processor; and a switching network associated with said converter for switching between said first and second formats at image frame boundaries substantially without introducing data discontinuities at said frame boundaries.
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2. In a system for processing video signals subject to exhibiting a first image line scanning format (I) or alternatively a different second image line scanning format (P), said system including an automatic scan format converter responsive to said signals exhibiting said first or second formats for automatically providing an output signal with a predetermined line scanning format compatible with the requirements of an output processor, said converter exhibiting seamless conversion between said first and second formats and including:
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a controlled output selection network having an input for receiving a signal from a first path (P-I conversion path) for converting a signal exhibiting said first format to a signal exhibiting said second format, an input for receiving a signal from a second path (I-P conversion path) for converting a signal exhibiting said second format to said first format, and an input for receiving a signals with said first or second format from a third path (bypass path) for conveying a signal without format conversion; and a memory device in said third path for conveying signals to said third input of said selection network;
whereinsaid memory device exhibits a delay that is significant relative to an image frame interval. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification