Aspects of Image Processing and Compression by Peter W. Hawkes (Eds.)

By Peter W. Hawkes (Eds.)

Advances in Imaging and Electron Physics merges long-running serials-Advances in Electronics and Electron Physics and Advances in Optical and Electron Microscopy. The sequence good points prolonged articles at the physics of electron units (especially semiconductor devices), particle optics at low and high energies, microlithography, photo technological know-how and electronic snapshot processing, electromagnetic wave propagation, electron microscopy, and the computing equipment utilized in these types of domain names.

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The majority selection procedure continues in the next stages until the median value is found. Gasteratos et al. (1997a) have proposed an improvement of this algorithm for the implementation of any rank filter using a single hardware structure. This is based on the concept that by having a method to compute the median value of 4N + 1 numbers and by being able to control 2N of these numbers, 40 M. I. VARDAVOULIA, A. GASTERATOS, AND I. ANDREADIS Vdd Output-wired inverters Vdd Inverter buffer o Vss Vss ...

1 Consider the following image f and soft structuring element [α, β]: EXTENSIONS, ALGORITHMS, AND IMPLEMENTATIONS 27 Soft dilation at point (0, 0) for k = 2, according to Eq. (38), is f ⊕ [α, β, 2](0, 0) = max(2) ({2 ♦ (14, 13)} ∪ {16, 12, 12, 17}) = max(2) (14, 14, 13, 13, 16, 12, 12, 17) = 16 According to the proposed technique, the structuring is divided into three structuring elements: 4 12 [ λ1 , μ1 ] 4 3 [ λ2 , μ2 ] [ λ3 , μ3 ] 12 3 The following multisets are obtained from the preceding structuring elements: {2 ♦ (14), 16}, {2 ♦ (13), 12} and {12, 17}, for the first, the second, and the third structuring elements, respectively.

VARDAVOULIA, A. GASTERATOS, AND I. ANDREADIS Notation: N: number of pixels; b: pixel value resolution (bits); im1, im2, . . , imN: image pixels; w1, w2, . . , wN: corresponding weights; k: the sought order statistic; temp: temporal result; o: output pixel. initial o=0 temp = 2b−1 begin for i = 1 to b do begin compare(im1, im2, . . imN: temp) {if imj = temp then EQj = 1 else EQj = 0 if imj < temp then LTj = 1 else LTj = 0} N N w j (EQ j + LT j ) ≥ k if j=1 then o ← temp w j LT j < k AND j=1 N w j LT j ≥ k elsif j=1 then temp ← temp − 2b−1−i else temp ← temp + 2b−1−i end end A module utilizing standard comparators, adders/subtractors, multipliers, and multiplexers (for the “if” operations) can be used to implement this technique in hardware.

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