Television picture compressor
First Claim
1. A color television picture compressor for reducing the size of the television picture in the raster for use with a video synchronizer of the type which samples the incoming video signal at a frequency n times as high as the color subcarrier and normally provides a predetermined number of samples per line and lines per field for a full field raster, comprising:
- means coupled to said video synchronizer for deleting samples per line and lines per field for compressing the picture in the television raster andmeans for averaging the surrounding picture samples to be deleted of the same color subcarrier phase into the value of the compressed picture sample to be maintained to thereby reduce the size of the picture while reducing the moire pattern.
0 Assignments
0 Petitions
Accused Products
Abstract
A television picture compressor for use with a video synchronizer provides means for sampling the video and providing a predetermined number of samples of video per line and lines per field. The compression of the television picture is provided by means for reducing the samples per line and lines per field. The compressor includes means for averaging the surrounding picture samples to be deleted to determine the value of each compressed picture sample to be maintained.
48 Citations
18 Claims
-
1. A color television picture compressor for reducing the size of the television picture in the raster for use with a video synchronizer of the type which samples the incoming video signal at a frequency n times as high as the color subcarrier and normally provides a predetermined number of samples per line and lines per field for a full field raster, comprising:
-
means coupled to said video synchronizer for deleting samples per line and lines per field for compressing the picture in the television raster and means for averaging the surrounding picture samples to be deleted of the same color subcarrier phase into the value of the compressed picture sample to be maintained to thereby reduce the size of the picture while reducing the moire pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. In combination with a color television video synchronizer which includes means for sampling television video at a frequency n times the color subcarrier to provide a predetermined number of samples per line and lines per field, storing means and means responsive to said stored predetermined number of samples per line and lines per field for providing a full field of television video, a video compressor for use therewith comprising:
-
means coupled to said sampling means for deleting alternate pairs of samples in each line and alternate lines of a field, means for averaging the surrounding picture samples to be deleted of the same color subcarrier phase to obtain the value of the compressed picture sample to be applied to the memory. - View Dependent Claims (11, 12)
-
-
13. In a television video synchronizer which includes means for sampling television video at a frequency n times the color subcarrier frequency to provide a predetermined number of samples per line and lines per field, means for storing said fields and lines and means responsive to the stored predetermined number of samples per line and lines per field and providing a full field of television video, a method for compressing the video, comprising:
-
(1) averaging the surrounding picture samples of a given picture sample of the same color subcarrier phase and adding this average into the given picture sample, (2) averaging the next adjacent picture sample in the same manner as step (1), (3) deleting the next pair of picture samples, (4) averaging the third pair of picture samples by averaging each of the third pair of picture samples by averaging the surrounding picture samples 180°
out of color subcarrier phase with respect to the subcarrier phase of the center picture sample and placing the third pair of samples next to the picture samples obtained in steps (1) and (2),(5) deleting the next two picture samples, (6) repeating steps (1) thru (4) for the remainder of the line. - View Dependent Claims (14, 15, 16)
-
-
17. In a television video synchronizer which includes means for sampling television video at a frequency n times the color subcarrier frequency to normally provide a predetermined number of samples per line and lines per field, and means for storing said samples and lines and means responsive to the stored predetermined number of samples per line and lines per field for providing a full field of television video, a compressor for compressing the video, comprising:
-
(a) means for deleting alternate pairs of picture samples and for deleting alternate lines of a field, (b) means for averaging the surrounding picture samples to be deleted of the same color subcarrier phase as the nondeleted picture sample into the nondeleted picture sample to determine the value of the compressed picture sample maintained when the color subcarrier phase of the picture sample is correct, and (c) means for averaging the surrounding four picture samples 180°
out of phase with respect to the center nondeleted picture sample to determine the compressed picture sample maintained when the color subcarrier phase of the picture sample is in error by 180°
.
-
-
18. In a television video synchronizer which includes means for sampling television video at a frequency n times the color subcarrier frequency to normally provide a predetermined number of samples per line and lines per field, and storing said samples and lines and means responsive to the stored predetermined number of samples per line and lines per field for providing a full field of television video, a method for compressing the video, comprising:
-
(1) deleting alternate pairs of picture samples, (2) averaging the surrounding picture samples of the sample color subcarrier phase as the nondeleted picture sample if the color subcarrier phase is correct to determine the value of compressed picture sample maintained, and (3) averaging each of the samples if the color subcarrier phase of the nondeleted picture sample is in error by 180°
by averaging the surrounding four picture samples 180°
out of phase with respect to the center nondeleted picture sample to determine the value of the compressed picture sample maintained.
-
Specification