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This paper addresses the thresholding of biological images through multiobjective optimization techniques. Three objective functions are used during the optimization, which are combined at pairs: Shannon entropy versus Otsu's inter-class and Shannon entropy versus Otsu's intra-class. We show that although both combinations are obtaining the same vector of thresholds, the first objective function pair...
The present work shows a segmentation methodology of images for the identification of Trypanosoma cruzi parasite at adult stage with techniques of digital image processing. To implement the method, 83 sample images of blood smears stained with Giemsa dye containing the parasite were used. The identification method uses a segmentation in the HSI color space (Hue, Saturation, Intensity), which is separately...
This paper describes SPICE-compatible macromodels to model the nonlinear behavior of operational amplifiers (Op Amp) and current feedback operational amplifiers (CFOA). The proposed macro-models include not only those performance parameters more important of the Op Amp and CFOA like the dynamic range, slew-rate, DC gain and gain-bandwidth product, but parasitic resistors and capacitors associated...
In this paper, a simple element stamp for floating or grounded voltage-controlled voltage sources is proposed. The novelty is that not only the behavior of single-ended, fully-differential and balanced differential operational amplifiers can directly be introduced in the admittance matrix without extra variables, but also the new stamp has few nonzero elements. As a consequence, a reduced and sparse...
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