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Articles by M. Khalid Khan
Total Records ( 2 ) for M. Khalid Khan
  M. Asmatullah Khan , M. Khalid Khan , M. Aurangzeb Khan and Tauseef-ur-Rehman
  Uniformly illuminated image greatly reduces the stress on the rest of the image processing tasks such as segmentation, object detection and classification etc. However, an image processing system designer has no control of the environment. The images obtained are usually poorly illuminated. The conventional approach to deal with non-uniform illumination of an image is to employ an appropriately scaled homomorphic filter. Direct application of homomorphic filter on an image controls non-uniform illumination but at the cost of blurring weak edges present in an image. In this paper we proposed decomposing an image in its directional components. This restricts non-uniform illumination in one of the directional components and then directional homomorphic filtering can be applied selectively to directional components. Towards the end, modified directional components are added to provide an enhanced and correctly illuminated image.
  Mohammad A.U. Khan , M. Khalid Khan and M. Aurangzeb Khan
  The identification of fingerprint images mainly requires matching the features of the fingerprint in question with those stored in a database. Since fingerprint identification system may receive noisy and distorted fingerprint image inputs, an efficient and robust enhancement of fingerprint images is essential for reliable fingerprint identification. In this study, we propose a decimation-free directional filter bank (DFB) structure. It provides output in the form of directional images as opposed to directional sub-bands provided in previous DFBs. The presence of directional images facilitates any further spatial processing if needed. However, we have to prepare a fingerprint image before it can be given as input to the proposed DFB structure due to the fact that fingerprints acquired are low in contrast. The preparation steps involve removing non-uniform illumination from the image. Then proposed DFB structure outputs directional images. The final enhanced result is constructed on a block-by-block basis by comparing energy of all the directional images and picking one that provides maximum energy.
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