Image analysis – Histogram processing – For setting a threshold
Patent
1991-06-21
1993-12-14
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
358426, 358429, 358432, G06K 936, H04N 141
Patent
active
052710718
ABSTRACT:
There is provided a digital, non-algorithmic method of compressing data. Data representing the addresses and values of pixels in an array are compressed. A first matrix is produced. The addresses of the first matrix are isomorphic with the range of possible pixel values, with one address corresponding to one pixel value. Same-valued pixels in the array are counted and each count is entered or tallied in the address of the first matrix corresponding to the value. One second matrix is generated for each pixel value actually present in the array. The addresses of the array and the second matrices are isomorphic. A binary "1" is placed in each address of each second matrix which corresponds to the address of the array having a pixel with the value to which the second matrix corresponds. The generated matrices represent very high data compression of 99% or higher. The first and second matrices may be transmitted, following which the array may be reconstructed therefrom. Because of the digital, non-algorithmic character of the foregoing, compression, transmission and decompression are essentially lossless and are conveniently subject to error correction. Residual mathematics is used to convert pixel values in the array to addresses in the first matrix and to convert the addresses of the transmitted first matrix to pixel values. Compression and decompression, including residual mathematical calculations may be effected by a general-purpose digital computer programmed in BASIC and/or by hardware which performs repetitive calculations.
REFERENCES:
patent: 4652935 (1987-03-01), Endoh et al.
patent: 5038390 (1991-08-01), Chandran
patent: 5065447 (1991-11-01), Barnsley et al.
Bain John N.
INDS-OPs, Inc.
Johns Andrew W.
Moore David K.
Squire William
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