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teknologi CCD

shaunna-kelleher
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teknologi CCD

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  1. TEKNOLOGI CCDKebanyakanscanner tinggiakhir format besarmenggunakanteknologi CCD untuksistemoptikmereka. The Charge Coupled Device (CCD) converts light on its surface into electrical signals. The Charge Digabungkan Device (CCD) mengubahcahayapadapermukaannyamenjadisinyallistrik. Color filters for red, green and blue on three consecutive rows of CCD elements provide a very high color gamut, which is typical for CCD scanners and cannot be reached with CIS type scanners. filter warnauntukmerah, hijaudanbirupadatigabarisberturut-turutunsur-unsur CCD menyediakan gamut warna yang sangattinggi, yang khasuntuk scanner CCD dantidakdapatdijangkaudengantipe scanner CIS. The illumination system for a CCD scanner usually consists of two fluorescent lamps which have a significant warm up time and require frequent recalibration because their light output varies with temperature, time and sometimes even the mains voltage. Sistempencahayaanuntuk scanner CCD biasanyaterdiridaridualampu neon yang memilikiwaktusampaisignifikanhangatdanmemerlukankalibrasiulangseringterjadi, karenakeluarancahayamerekabervariasidengantemperatur, waktudanbahkankadang-kadangteganganlistrik.

  2. Faktabahwatidakadalensaatau CCD tersediauntukmenangkap 36 "lebardokumenpadaresolusitinggisekaligusmengarahke lain Kelemahandari scanner CCD, biasadisebutsebagai" jahitan ". The scanner has to be recalibrated on a regular basis because it consists of three or four independent CCD subsystems, each having their own lenses and mirrors. Pemindaiharusdikalibrasiulangsecaraberkalakarenaterdiridaritigaatauempatsubsistem CCD independen, masing-masingmemilikilensamerekasendiridancermin. During this process, a high precision test target is scanned and the offset in the horizontal and vertical direction between the individual cameras is measured. Selamaprosesini, target ujipresisitinggidipindaidan offset padaarahhorisontaldanvertikalantarakameraindividudiukur. These values are later used to “stitch” the three or four images from the individual CCD together. Nilai-nilaiinikemudiandigunakanuntuk "menjahit" tigaatauempatgambardari CCD individubersama-sama.

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