标题: 多个萤幕媒体设备之实作
The DPF Multi-Panel Controller
作者: 廖家麟
Liao, Chia-Lin
林一平
罗悦臣
Lin, Yi-Bing
Luo, Yue-Chen
资讯学院资讯学程
关键字: 通用串列汇流排;數位相框;消费性电子产品;USB;DPF;Consumer electronics
公开日期: 2010
摘要: 目前市面数位相框的功能设计为单一画面显示照片。欲让使用者同时欣赏丰富的
色彩及影像,可将多台数位相框彼此串接,以达到多个画面显示之功能。
本研究以数位相框为例实作多个萤幕串接之媒体设备。我们透过 USB 连接线将多
台数位相框彼此连接起来及实作 USB 主机端(USB Host) 及 USB 装置端(USB Device)
两种角色的程式,并以自订的协定来互相彼此沟通,以达到照片可直接在多个数位相
框萤幕上显示之目的。本实作基于整体成本考量下,必须选用低成本的相关硬体,如
CPU(MIPS Clock 96MHz)、Memory(Clock 96MHz;8MB SDRAM)、JPEG Decoder(Clock
48MHz)。然而另外考虑的限制是,近日数位相机的高解析度技术不断提升,影像档案
越来越大,效能表现较有限制。
在上述相关限制下,若要考量提升整体效率,我们必须在软体上做相对的调整。
本实作将两台数位相框串联,以第一台数位相框为主,因 JPEG 档案解压缩成原始影像
资料的时间较为耗时,故将 JPEG 档案解压缩成萤幕尺寸之原始影像资料作为传输档
案,以加快传输的速度,并可将萤幕尺寸之原始影像资料直接显示在第二台数位相框
萤幕上,不需经过相关解压缩过程,以增加显示的效率。
Current market design of DPF features a single screen to display photos. However, to
allow users to simultaneously enjoy the rich colors and images, numerous DPFs are
cascaded to achieve the multiple screen display function.
In this research, DPF is taken as an example and demonstrates the DPF multi-panel
controller. Many DPFs are linked together through USB cable. DPF plays the roles as both
USB Host and USB Device. The researcher controls the software of USB Host and USB
Device, and makes them communicate through vendor protocols, so that the pictures can be
displayed directly in a number of DPFs’ screen. For the overall cost of the implementation
considerations, inexpensive hardware is utilized, such as CPU (MIPS Clock 96MHz),
Memory (Clock 96 MHz, 8MB SDRAM), JPEG Decoder (Clock 48 MHz). In addition,
another limitation is that, recently, with the improvement of the DPF high-resolution, the
image sizes are bigger and bigger, which leads to the limited performance.
Under the related limitation stated above, in order to improve the overall performance,
the software must be adjusted relatively. In the experiment, two DPFs are cascaded with the
first DPF as the base. It is time-consuming to decode JPEG files into the raw data. Hence,
JPEG files are decoded into the scaled-down raw data as the transmission files to accelerate
the transfer rate. This scaled-down raw data is shown directly on the second DPF screen
without any related decoding process to increase the performance.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079779515
http://hdl.handle.net/11536/46526
显示于类别:Thesis


文件中的档案:

  1. 951501.pdf

If it is a zip file, please download the file and unzip it, then open index.html in a browser to view the full text content.