초록 ▼

An NTSC composite color video signal is dematrixed and its RGB components are digitized so that each image or input frame is represented by a 512×512 pixel array. One high resolution output field is generated for each input frame by deriving a plurality of subpixel values for each input pixel. The s

An NTSC composite color video signal is dematrixed and its RGB components are digitized so that each image or input frame is represented by a 512×512 pixel array. One high resolution output field is generated for each input frame by deriving a plurality of subpixel values for each input pixel. The subpixel values for a given pixel are derived by examining the nearest neighboring pixels and by utilizing enhancement algorithms represented by data in lookup tables. Signal to noise ratio improvement is achieved by comparing each given pixel value to the values of its neighboring pixels and then deciding whether or not to keep the given pixel value or to replace it with the median of it and its nearest neighbors. The subpixel values are fed through a digital to analog converter where the appropriate synchronization is added so that the analog outputs of the three branches of the device conform to the RS 343A format.

대표청구항 ▼

A method of enhancing the quality of a video signal, comprising the steps of: generating in real time from an input video signal having a first presentation bandwidth and including a succession of interlaced video fields a set of pixel values representing an image, each of said pixel values comprisi

A method of enhancing the quality of a video signal, comprising the steps of: generating in real time from an input video signal having a first presentation bandwidth and including a succession of interlaced video fields a set of pixel values representing an image, each of said pixel values comprising a multi-bit digital value representing video signal intensity; deriving in real time a single set of subpixel values for each said pixel value according to a predetermined function, said function deriving each subpixel value solely from the values of a central pixel and a set of pixels surrounding said central pixel and contained in a video field which is interlaced with the video field containing the central pixel, and said function providing said subpixel values as multi-bit digital values; and converting in real time only the subpixel values obtained in said deriving step into an output signal corresponding to a video signal having a second presentation bandwidth higher than said first presentation bandwidth.