Title :
Hardware Engine for Supporting Gray-Tone Paintbrush Function on Electrophoretic Papers
Author :
Wen-Chung Kao ; Hsing-Yu Chen ; Ying-Hao Liu ; Shu-Cheng Liou
Author_Institution :
Dept. of Appl. Electron. Technol., Nat. Taiwan Normal Univ., Taipei, Taiwan
Abstract :
The electrophoretic display (EPD) has been widely applied on electronic readers (E-Readers) for displaying image/text contents. With a touch panel, the user can put annotations on the contents at will. However, none of the available E-Readers support the function of paintbrush, which allows the user to plot gray tone figures. This is because the EPD is a bistable display whose driving method is quite complicated. In this paper, we first discuss the issues of realizing paintbrush function on the EPD display controller and then propose a new signal processing engine for the paintbrush function. The engine contains four stages: 1) screening the detected pixel coordinates; 2) interpolating pixels; 3) performing image halftoning to generate more visual gray levels; and 4) driving the pixels to the target states. The experimental results show that the engine meets the real-time requirement to complete the pixel interpolation as well as produce the gray-tone traces.
Keywords :
computer displays; document image processing; electronic paper; electrophoretic displays; image enhancement; interpolation; optical information processing; screens (display); text analysis; touch sensitive screens; EPD display controller; bistable display; detected pixel coordinates screening; electronic readers; electrophoretic display; electrophoretic paper; gray tone figure; gray tone paintbrush function; gray tone traces; hardware engine; image content display; image halftoning; pixel interpolation; signal processing engine; text content display; touch panel; visual gray level generation; Engines; Generators; Hardware; Interpolation; Real-time systems; Timing; Visualization; Display calibration; electrophoretic display (EPD); hardware engine; image enhancement; temperature compensation;
Journal_Title :
Display Technology, Journal of
DOI :
10.1109/JDT.2013.2289364