Ishtiaq Rasool Khan

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Numerical di erentiation formulas based on interpolating polynomials, operators and lozenge diagrams can be simpli ed to one of the nite di erence approximations based on Taylor series. In this paper, we have presented closed-form expressions of these approximations of arbitrary order for rst and higher derivatives. A comparison of the three types of(More)
In this paper we present an augmented reality system for automatic try-on of 3D virtual eyeglasses. The user can select from various virtual models of eyeglasses for trying-on and the system will automatically fit the selected virtual glasses on the user's face. The user can see his/her face as in a mirror with the 3D virtual glasses fitted on it. We also(More)
With advent of high dynamic range (HDR) imaging techniques, it has been possible to capture natural scenes in larger details. HDR images are tone-mapped to lower dynamic range (LDR) versions for displaying on paper or a screen. Details lost during tone-mapping are important for certain existing and future applications, and need to be preserved. However, the(More)
The human visual system (HVS) uses several methods to interactively adapt to the incredible real-world range of light intensities, continually changing to effectively perceive visual information. Eye HDR is a new approach to the problem of displaying high-dynamic-range (HDR) content on low-dynamic-range displays. Instead of creating a single static image,(More)
Much research has been performed on the efficient design and implementation of finite impulse response (FIR) digital differentiators. Some of the commonly used design procedures include windows based designs [1], minimax designs [2], eigenfilters [3], [4], optimization techniques [5], the weighted least squares technique [6], and a recent design with(More)
Maximally flat (MAXFLAT) finite-impulse response digital filters, including the Hilbert transformers (HTs), have the smoothest magnitude responses among the available types of FIR digital filters. However, the transition bands of MAXFLAT filters are relatively wider, and this makes them unattractive in certain applications. We present new designs of even(More)
Abstract—Ripple designs of FIR digital differentiators are suitable for wideband applications, but cannot produce very high accuracies in narrow bands. In this paper, we present new simple designs for FIR digital differentiators, with very high accuracies in the narrow bands centered at arbitrary frequencies in the lower half of the frequency band. First, a(More)