<p>In this thesis, I present three research topics in the areas of scanning and printing.</p><p>The first topic is on detecting and removing specific artifacts in images scanned using</p><p>sheetfed scanners. Sheetfed scanners are widely used for scanning stacks of loose pages at</p><p>high speed. The scanhead in the sheet-fed scanners is stationary and the pages are fed with</p><p>an automatic document feeder. When dust particles get stuck onto the scanner glass, they</p><p>reflect the incident light and cause vertical streaks in the scanned images. These artifacts are</p><p>known as dust streaks. I have developed a method for detecting and healing dust streaks.</p><p>The second topic is on motor control system and test page design for inkjet printers.</p><p>Motor control consists of two main parts which are movement of the printhead in the scan</p><p>direction and the process direction. Scan direction movement needs to have a constant</p><p>smooth velocity in order to avoid banding artifacts. Process direction movement needs to</p><p>advance an exact distance in order to avoid misalignment. The full procedure for implementing</p><p>the motor control on a microcontroller, determining optimal parameters, and designing</p><p>test pages for validating the motor control system is presented.</p><p>The third topic is on printer model based halftoning and print mask design using DBS.</p><p>Inkjet printers can fire nozzles at specific pixel locations. Due to nozzle clogging and nonuniformity</p><p>in the nozzles, inkjet printers usually print in the multipass mode to reduce print</p><p>artifacts. In this mode, the printhead goes over the same line more than once with different</p><p>sets of nozzles of the same ink. Print mask determines which pixels are printed at a certain</p><p>pass and which pixels are not printed. I developed a printer model to predict prints and</p><p>also developed test pages to obtain parameters for the printer model. Then, we looked into</p><p>model based halftoning and print mask design using the direct binary search algorithm. In</p><p>addition, I investigated the advantages and disadvantages of using light magenta as opposed</p><p>to using black ink in 4-color printing.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/14155967 |
| Date | 12 March 2021 |
| Creators | Daulet O Kenzhebalin (10225127) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/DETECTION_AND_HEALING_OF_STREAKS_CAUSED_BY_DUST_IN_SHEETFED_SCANNERS_MOTOR_CONTROL_MODEL_BASED_HALFTONING_AND_PRINT_MASK_DESIGN_USING_DIRECT_BINARY_SEARCH_FOR_INKJET_PRINTERS/14155967 |
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