Television receiver having picture magnifying apparatus
First Claim
1. In a television receiver including a source of analog video signals, an analog-to-digital converter for producing digital samples representative of said analog video signals, a digital signal processor for producing digital luminance and digital chrominance samples from said digital samples, and a converting means for developing image representative signals from said digital luminance and said digital chrominance samples to produce a raster-scanned image on a raster-scanned display device,apparatus modifying said digital luminance and said digital chrominance samples for magnifying a predetermined area of said image by a factor 2I, said predetermined image area including M image elements and N lines of said raster scan, wherein I, M and N are integers, comprising:
- window generating means for locating said predetermined image area at selectable predetermined horizontal an vertical positions of said image and for locating said magnified image area in predetermined horizontal and vertical relationship to said predetermined image area;
a user-actuated device coupled to said window generating means for selecting said selectable predetermined horizontal and vertical positions;
a first digital memory to which said digital luminance and said digital chrominance samples are applied, said first digital memory having first addressable storage registers for storing a number MxN of said digital luminance samples corresponding to said predetermined image area, and having second addressable storage reqisters for storing a number no greater than (M×
N)/2 of said digital chrominance samples corresponding to said predetermined image area;
addressing means responsive to said window generating means for developing first addressing signals to address said first and second addressable storage registers to store ones of said digital luminance and said digital chrominance samples at times when lines of said raster scan correspond to said predetermined image area, and for developing second addressing signals to address said first and second addressable storage registers to produce said stored ones of said digital luminance and said digital chrominance samples at times of said lines other than times of said lines corresponding to said magnified image area;
interpolating means to which said produced stored ones of said digital luminance and said digital chrominance samples are applied for developing 2I ×
M image samples representing modified digital luminance and modified digital chrominance samples corresponding to one line of said raster scan of said magnified image area, said interpolating means including a second digital memory for storing said 2I ×
M image samples developed during an interval between times of said lines during which said magnified image is produoed, and for producing said 2I ×
M stored image samples at said times of said lines during which said magnified image is produced, said interpolating means repeating the sequence of developing, storing and producing 2I ×
M image samples for each line corresponding to the 2I ×
N lines of said magnified image area; and
multiplexing means responsive to said window generating means for applying said modified digital luminance and said modified digital chrominance samples in place of the digital luminance and digital chrominance samples, respectively, corresponding to said magnified image area,whereby the image produced on said display device includes a magnified portion thereof in accordance with said position selected by said user-actuated device.
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0 Petitions
Accused Products
Abstract
Apparatus providing a magnified picture display for a television receiver employs a reduced-size digital memory which stores only the digitized video signal components necessary to generate video signals to produce the magnified picture display. A simplified user-controlled picture positioning arrangement generates write and read addressing signals for the digital memory representative of both the picture area of the magnified picture display and of the normal picture display therein which is to be magnified. Writing of the digitized video signal components of the normal picture display into the digital memory is accomplished in "real time" whereas reading of the stored data from the memory and signal processing to develop interpolated digitized video signal components of the magnified picture is accomplished at a reduced processing rate on a line-by-line basis in between memory write cycles. User selection of discrete degrees of magnification and of freeze-frame (still) or continuously-updated (essentially real-time) displays is provided.
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Citations
20 Claims
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1. In a television receiver including a source of analog video signals, an analog-to-digital converter for producing digital samples representative of said analog video signals, a digital signal processor for producing digital luminance and digital chrominance samples from said digital samples, and a converting means for developing image representative signals from said digital luminance and said digital chrominance samples to produce a raster-scanned image on a raster-scanned display device,
apparatus modifying said digital luminance and said digital chrominance samples for magnifying a predetermined area of said image by a factor 2I, said predetermined image area including M image elements and N lines of said raster scan, wherein I, M and N are integers, comprising: -
window generating means for locating said predetermined image area at selectable predetermined horizontal an vertical positions of said image and for locating said magnified image area in predetermined horizontal and vertical relationship to said predetermined image area; a user-actuated device coupled to said window generating means for selecting said selectable predetermined horizontal and vertical positions; a first digital memory to which said digital luminance and said digital chrominance samples are applied, said first digital memory having first addressable storage registers for storing a number MxN of said digital luminance samples corresponding to said predetermined image area, and having second addressable storage reqisters for storing a number no greater than (M×
N)/2 of said digital chrominance samples corresponding to said predetermined image area;addressing means responsive to said window generating means for developing first addressing signals to address said first and second addressable storage registers to store ones of said digital luminance and said digital chrominance samples at times when lines of said raster scan correspond to said predetermined image area, and for developing second addressing signals to address said first and second addressable storage registers to produce said stored ones of said digital luminance and said digital chrominance samples at times of said lines other than times of said lines corresponding to said magnified image area; interpolating means to which said produced stored ones of said digital luminance and said digital chrominance samples are applied for developing 2I ×
M image samples representing modified digital luminance and modified digital chrominance samples corresponding to one line of said raster scan of said magnified image area, said interpolating means including a second digital memory for storing said 2I ×
M image samples developed during an interval between times of said lines during which said magnified image is produoed, and for producing said 2I ×
M stored image samples at said times of said lines during which said magnified image is produced, said interpolating means repeating the sequence of developing, storing and producing 2I ×
M image samples for each line corresponding to the 2I ×
N lines of said magnified image area; andmultiplexing means responsive to said window generating means for applying said modified digital luminance and said modified digital chrominance samples in place of the digital luminance and digital chrominance samples, respectively, corresponding to said magnified image area, whereby the image produced on said display device includes a magnified portion thereof in accordance with said position selected by said user-actuated device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a television receiver including a source of analog video signals, an analog-to-digital converter for producing digital samples representative of said analog video signals, a digital signal processor for producing digital luminance and digital chrominance samples from said digital samples, and a converting means for developing image representative signals from said digital luminance and said digital chrominance samples to produce a raster-scanned image on a raster-scanned display device,
apparatus modifying said digital luminance and said digital chrominance samples for magnifying a predetermined area of said image by a factor 2I, said predetermined image area including M image elements and N lines of said raster scan, wherein I, M and N are integers, comprising: -
window generating means for locating said predetermined image area at selectable predetermined horizontal and vertical positions of said image and for locating said magnified image area in predetermined horizontal and vertical relationship to said predetermined image area; a user-actuated device coupled to said window generating means for selecting said selectable predetermined horizontal and vertical positions; a digital memory to which said digital luminance and said digital chrominance samples are applied, said digital memory having first addressable storage registers for storing a number M×
N of said digital luminance samples corresponding to said predetermined image area, and having second addressable storage registers for storing a number no greater than (M×
N)/2 of said digital chrominance samples corresponding to said predetermined image area;addressing means responsive to said window generating means for developing first addressing signals to addresss said first and second addressable storage registers to store ones of said digital luminance and said digital chrominance samples at times when lines of said raster scan correspond to said predetermined image area, and for developing second addressing signals to address said first and second addressable storage registers to produce said stored ones of said digital luminance and said digital chrominance samples at times of said lines other than times of said lines corresponding to said magnified image area; interpolating means to which said produced stored ones of said digital luminance and said digital chrominance samples are applied for developing 2I ×
M image samples representing modified digital luminance and modified digital chrominance samples corresponding to lines of said raster scan within said magnified image area, said interpolating means developing said 2I ×
M image samples for each line corresponding to the 2I ×
N lines within said magnified image area; andmultiplexing means responsive to said window generating means for applying said modified digital luminance and said modified digital chrominance samples in place of the digital luminance and digital chrominance samples, respectively, corresponding to said magnified image area, whereby the image produced on said display device includes a magnified portion thereof in accordance with said position selected by said user-actuated device. - View Dependent Claims (16, 17)
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18. In a television receiver including a source of analog video signals, an analog-to-digital converter for producing digital samples. representative of said analog video signals, a digital signal processor for produing digital luminance and digital chrominance samples from said digital samples, and a converting means for developing image representative signals from said digital luminance and said digital chrominance samples to produce a raster-scanned image on a raster-scanned display device,
apparatus modifying said digital luminance and said digital chrominance samples for magnifying a predetermined area of said image by a factor 2I, said predetermined image area including M image elements and N lines of said raster scan, wherein I, M and N are integers, comprising: -
window generating means for locating said predetermined image area at selectable predetermined horizontal and vertical positions of said image and for locating said magnified image area in predetermined horizontal and vertical relationship to said predetermined image area; positioning means coupled to said window generating means for selecting said selectable predetermined horizontal and vertical positions to periodically change the selected position of said magnified image area according to a predetermined sequence; a digital memory to which said digital luminance and said digital chrominance samples are applied, said digital memory having first addressable storage registers for storing a number M×
N of said digital luminance samples corresponding to said predetermined image area, and having second addressable storage registers for storing a number no greater than (M×
N)/2 of said digital chrominance samples corresponding to said predetermined image area;addressing means responsive to said window generating means for developing first addressing signals to address said first and second addressable storage registers to store ones of said digital luminance and said digital chrominance samples at times when lines of said raster scan correspond to said predetermined image area, and for developing second addressing signals to address said first and second addressable storage registers to produce said stored ones of said digital luminance and said digital chrominance samples at times of said lines other than times of said lines corresponding to said magnified image area; interpolating means to which said produced stored ones of said digital luminance and said digital chrominance samples are applied for developing 2I ×
M image samples representing modified digital luminance and modified digital chrominance samples corresponding to the 2I ×
N lines of said raster scan within said magnified image area; andmultiplexing means responsive to said window generating means for applying said modified digital luminance and said modified digital chrominance samples in place of the digital luminance and digital chrominance samples, respectively, corresponding to said magnified image area, whereby the image produced on said display device includes a magnified portion thereof in accordance with the sequence of said position periodically selected by said positioning means. - View Dependent Claims (19, 20)
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Specification