نواب صاحب چھتاری
ان سطروں کو لکھتے وقت جناب نواب صاحب چھتاری کی رحلت کی خبر ملی، ان کی کتاب زندگی کے خاتمہ پر جاہ، ثروت، رتبہ، وزن، وقار، دینداری، وضعداری، فراخدلی، رواداری، سیرچشمی اور ہر دلعزیزی کا ایک صحیفہ بھی ختم ہوگیا، اﷲ تعالیٰ نے ان کو دنیا کی تمام نعمتوں سے سرفراز رکھا، دعا ہے کہ آخرت میں بھی وہ برکت خداوندی کے کوثر و تسنیم سے سیراب ہوتے رہیں، آمین۔ (صباح الدین عبدالرحمن، جنوری ۱۹۸۲ء)
اردو اور ہندی کا لسانی اشتراک و افتراق Initially was only language used to express human ideas. In every age, along with customs and traditions, language also went through stages of evaluation. That is why language of each region is unique. This uniqueness of languages is of its identity. Like human beings, languages also have their own families, and different languages grow as sub- branches of language family. They flourish and sometimes thrive and come to life through process of evolution. When some languages die out. Urdu and Hindi also belong to large languages families. They have a deep relationship. And speaking of same relationship, some tinkers do not separate them from each other. When it sometimes thinkers, there is difference between in the two. At a glance, we will mention the linguistic similarities and difference between Urdu and Hindi. Where are places and where there is difference between them, but all of them are mentioned here.
This dissertation presents work on the Geometric Superresolution. There are two main parameters that can affect Geometric Superresolution, the finite size of pixels and the pitch of the pixels in digital imaging device like CCD (charged coupled device). In superresolution systems, the ultimate limit to resolution generally comes from the Geometric and not from the optical part of an imaging system. This thesis mainly deals with the undersampling of an optical image in which the separation between the neighbouring pixels in a CCD is assumed to be greater than the separation required by Nyquist Sampling. The problem of undersampling an optical image has been dealt with the use of an Optical Mask placed at the Fourier transform plane in a coherent 4f imaging system. The one dimensional version of the Optical Mask consists of a 1-dimensional amplitude grating. The Optical Mask is used to sample the Fourier transform of the input object. Due to the sampled Fourier transform, the image plane contains replicas of the input object. A CCD is used to undersample these replicas. The recorded undersampled image is Fourier transformed and contains replicas of original object spectrum but overlapped due to the undersampled image recorded by CCD. The overlapped spectrum is multiplied with a soft copy of an Optical Mask which removes the overlapping by removing the neighbouring spectral copies. An interpolation is done on the recovered single object spectral copy to fill the holes in the spectrum. The resultant spectrum is then Fourier transformed to obtain an image free of artefacts and free of undersampling effects. Different analogues of Optical Masks and CCD pixels have been presented and discussed in this thesis. Optical Masks may consist of negligibly small line widths or lines with finite widths. Similarly, an ideal CCD may consist of point pixels in which the pixel size is negligible in comparison with the spacing between them or in real situations may have finite size. The effects of these parameters on Geometric Superresolution have been discussed in the thesis. Simulation results in one and two dimensional have been presented to support the idea. A part of the thesis also discusses a technique dealing with subpixeling. An optical image using a Spatial light modulator is projected on a CCD and shifted in subpixel steps. The retrieved data corresponding to each subpixel step is combined to obtain high resolution image. This has been supported with experimental verification.