Image analysis – Image compression or coding – Transform coding
Patent
1995-05-15
1998-06-30
Boudreau, Leo
Image analysis
Image compression or coding
Transform coding
382232, 382250, 348384, 358432, 375222, G06K 936, G06K 946
Patent
active
057745986
ABSTRACT:
An image processing system for sample rate conversion of an image signal representing an image of pixels from a first sample rate to a second sample rate includes: an image acquisition device for acquiring the image signal from an image signal source at the first sample rate; a first memory for buffering the input signal; a second memory for storing predetermined discrete cosine transform coefficients; a dot product multiplier for multiplying the image signal retrieved from the first memory times the predetermined coefficients to produce an output signal at the second sampling rate; a third memory for buffering the output signal; control sequencer logic for controlling operation of the image processing system; and an output device for providing a resampled image at the second sampling rate from the output signal. The image processing system facilitates sample rate conversion by segmenting the image into segments of image data points wherein a separate and different offset is determined for each segment. A discrete cosine transform is performed on each segment of image data points to generate corresponding DCT coefficients. Thereafter, resampled image data points are generated by taking a modified IDCT of the DCT coefficients using a modified IDCT basis matrix which is dependent upon a sampling rate conversion ratio and/or an offset.
REFERENCES:
patent: 5168375 (1992-12-01), Reisch et al.
patent: 5199046 (1993-03-01), Ling
patent: 5534925 (1996-07-01), Zhong
"Interpolation Using the Discrete Cosine Transform"; Agbinya; Electronics Letters 24 Sep. 1992, vol. 28, No. 20.
Reisch Michael L.
Sunshine Lon E.
Wober Munib A.
Boudreau Leo
Mariam Daniel G.
Polaroid Corporation
Sabourin Robert A.
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