The framework is on implementing image capturing technique in an embedded system based on Raspberry Pi board. This paper is on Methodology of a camera based assistive device that can be used by visually impaired people to get information from Tamil Braille document and Tamil Text document by Speech output. Optical Braille recognition and Optical Character recognition are useful for visually impaired people who cannot read Text document and Braille script, but need to access the content of the documents. Editing and Reprinting of Braille document and Text document that were embossed and printed on paper are time consuming and labour intensive. Digitizing Braille documents and Text documents also helps reduce storage space. Optical Braille Recognition and Optical Character Recognition is used to digitize Braille script and Text document that have been produced with non-computerized system. In: Archäologische Mitteilungen aus Iran und Turan, 45 (2013), pp. Lead from other mines may have been required during refining to mitigate the problems related to the bismuth content of the smelted argentiferous lead. Lead isotope analysis shows that the ore smelted is distinct from the traces of lead found in late 9th–10th century Afghan dirhams. The gold to silver ratio of the argentiferous lead provides a link to dirham production in Northern Afghanistan.
Argentiferous lead is associated with antimonides and bismuth indicating that fahlore minerals and other sulfosalts were present in the ore. The slag contains sulfides, speiss phases, and argentiferous lead prills. Production at Panjhir was polymetallic (Cu–Pb–Ag) and the two slag types possibly reflect two stage smelting. Eleven slags and three furnace fragments were analyzed by microscopy, X-ray diffraction, and mass spectrometry. The technology of silver production and the role of Panjhir in dirham manufacture were investigated through the archaeometallurgical analysis of slag and production debris.
Silver production bloomed under the Samanids and the high-quality dirhams produced can be found across Eurasia. Panjhir, in the Hindu Kush, is praised in medieval accounts for the productivity of its silver mines.
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