The selection of filters plays a fundamental role for the setup and the performance of a multispectral image acquisition system. When the number of available filters is large, the full search method becomes computationally expensive. In this paper the filter selection problem is defined as a dimensionality reduction process by selecting the filters that contains most of the essential informatio...

The title Schiff base compound, C25H19NO2S, crystallizes in a statistically disordered structure comprising keto and enol tautomeric forms. In the enol form, the benzenoid arrangment is promoted by a strong intra-molecular O-H⋯N hydrogen bond and adopts an E conformation about the imine bond. In the keto form there is an intramolecular N-H⋯O hydrogen bond. In the crystal, an extended network of...

In the title complex, {(C2H8N)[Cu(C8H4O4)(C8H6N3)]} n , there are two Cu(II) cations (each located on a centre of inversion), one benzene-1,2-di-carboxyl-ate dianion, one 3-(pyridin-4-yl)-1H-pyrazol-1-ide anion and one di-methyl-ammonium cation in the asymmetric unit. The di-methyl-ammonium cation was highly disordered and was treated with the SQUEEZE routine in PLATON [Spek (2009 ▶). Acta Crys...

Bai, Z.-C. & Jing, Z.-L. (2007). Acta Cryst. E63, o3822. Bernstein, J., Davis, R. E., Shimoni, L. & Chang, N.-L. (1995). Angew. Chem. Int. Ed. Engl. 34, 1555-1573. Bruker (2005). SADABS. Bruker AXS Inc., Madison, Wisconsin, USA. Bruker (2007). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565. Farrugia, L. J. (1999). J. Appl. Cryst. 32, 8...

In the title compound, C14H16ClNO2, the cyclo-hexyl ring has a chair conformation. The dihedral angle between the benzene ring and the mean plane of the four planar C atoms of the cyclo-hexyl ring is 45.2 (3)°. The two carbonyl groups are trans to one another, with an O=C-C=O torsion angle of -137.1 (3)°. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds forming chains propagating a...

In the title compound, C15H11ClN2O4, the central β-lactam ring is approximately planar [maximum deviation = 0.044 (2) Å for the N atom from the mean plane] and subtends dihedral angles of 61.17 (11) and 40.21 (12) °, respectively, with the nitro and chloro-benzene rings. Both substituents lie to the same side of the β-lactam core. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into C(...

The title cluster, [Cu4(C11H12N2O6)4], was obtained from the Cu(0)-FeCl2·4H2O-H4 L-Et3N-DMF reaction system (in air), where H4 L is 2-hy-droxy-methyl-2{[(2-hy-droxy-3-nitro-phen-yl)methyl-idene]amino}-propane-1,3-diol and DMF is di-methyl-formamide. The asymmetric unit consists of one Cu(2+) ion and one dianionic ligand; a -4 symmetry element generates the cluster, which contains a {Cu4O4} cuba...

In the asymmetric unit of the title compound, C(46)H(52)N(3)O(9)·3C(6)H(6), two of the benzene solvent mol-ecules are located in general positions and two are disposed about inversion centers. One of the benzene mol-ecules on an inversion center was grossly disordered and was excluded using the SQUEEZE subroutine in PLATON [Spek (2009 ▶). Acta Cryst. D65, 148-155]. In addition, one of the 2,2,5...

The mol-ecule of the title compound, C9H7IN4OS, is almost planar (r.m.s. deviation = 0.0373 Å). In the mol-ecule, N-H⋯N and N-H⋯O hydrogen bonds generate, respectively, S(5) and S(6) ring motifs. In the crystal, mol-ecules are linked via N-H⋯O hydrogen bonds, forming chains propagating along [010]. These chains are linked via S⋯I contacts [3.4915 (16) Å], forming sheets lying parallel to (100)....

This paper proposes a new scheme for color constancy. A backpropagation (BP) neural network is used to model the nonlinear functional relationship between the white point chromaticity and coefficients of illuminant functions. The trained BP network can then be used to estimate the spectral power distribution of surrounding illuminant. Substituting this illuminant estimate into the finite-dimens...