Method for eliminating temporal and spacial distortion from interlaced video signals
First Claim
1. A method for substantially eliminating temporal and spatial distortion from interlaced video signals, said method comprising:
- converting said interlaced video signals to digital signals;
sequentially inputting said digital signals into three field buffers;
sequentially withdrawing said digital signals from two of said three field buffers during inputting of said digital signals into a third of said three field buffers;
averaging said digital signals withdrawn from said two of said three field buffers; and
converting said averaged signals into analog video signals.
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Abstract
A method and apparatus for the elimination of temporal and spacial distortions from interlaced video signals, particularly those that occur in signals associated with affine transformations. This elimination is particularly of value for signals that have been magnified so as to prevent the visual appearance of reverse movement of moving images. The removal of these distortions is achieved by sequentially inputting the images fields into three field buffers, updating the data in a rotary manner. This data is withdrawn from any two of the field buffers, while the third field buffer is being updated, and averaging the data from the two. When such averaged data is displayed, there is no apparent reverse direction motion to the image. The method and apparatus are applied to a system wherein there is affine transformation to achieve selected pan, tilt, rotation and magnification of images during the correction of distorted images received from a wide angle lens.
104 Citations
17 Claims
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1. A method for substantially eliminating temporal and spatial distortion from interlaced video signals, said method comprising:
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converting said interlaced video signals to digital signals; sequentially inputting said digital signals into three field buffers; sequentially withdrawing said digital signals from two of said three field buffers during inputting of said digital signals into a third of said three field buffers; averaging said digital signals withdrawn from said two of said three field buffers; and converting said averaged signals into analog video signals. - View Dependent Claims (2, 3, 5)
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4. A method for substantially eliminating temporal and spatial distortion from digitized interlaced video signals, said method comprising:
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sequentially inputting said digitized signals into three field buffers in a rotating manner, overwriting data previously stored in each buffer; sequentially withdrawing said digitized signals from two of said three field buffers during inputting of said digitized signals into a third of said three field buffers; and averaging said digital signals withdrawn from said two of said three field buffers to provide output signals substantially without said temporal and spatial distortion. - View Dependent Claims (6)
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7. A method for substantially eliminating temporal and spatial distortion from distorted interlaced video signals obtained from a wide angle lens and intended for affine transformation to select pan, tilt, rotation and magnification for selected portions of said video signals, said method comprising:
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converting said interlaced video signals to digital signals; sequentially inputting said digital signals into three field buffers, continuously overwriting data in each of said three field buffers; sequentially withdrawing said digital signals from two of said three field buffers during inputting of said digital signals into a third of said three field buffers, said withdrawal controlled by an algorithm for the affine transformation according to pan, tilt, rotation and magnification; averaging said digital signals withdrawn from said two of said three field buffers; and converting said averaged signals into analog video signals for the selected portion of input video signals. - View Dependent Claims (8, 9)
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10. Apparatus for substantially eliminating temporal and spatial distortion from interlaced video signals, said apparatus comprising:
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a convertor circuit for converting said interlaced video signals to digital signals; an input sequencer circuit for inputting said digital signals into three field buffers; an output sequencer circuit for withdrawing said digital signals from two of said three field buffers during inputting of said digital signals into a third of said three field buffers; an averager circuit for averaging said digital signals withdrawn from said two of said three field buffers; and an output convertor circuit for converting said averaged signals into analog video signals. - View Dependent Claims (11, 12)
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13. An integrated circuit for use in an imaging system comprising
a plurality of random access memories, at least two of which comprise memories for storing first and second fields of video data, a random access memory multiplexer coupled to said random access memories, and a plurality of input and output controllers coupled to said random access memories via said random access memory multiplexer, said output controllers comprising one of a dewarping logic circuit and a vertical line averaging circuit.
Specification