title: [Development of a video image system for wireless capsule endoscopes based on DSP].
abstract: A video image recorder to record video picture for wireless capsule endoscopes was designed. TMS320C6211 DSP of Texas Instruments Inc. is the core processor of this system. Images are periodically acquired from Composite Video Broadcast Signal (CVBS) source and scaled by video decoder (SAA7114H). Video data is transported from high speed buffer First-in First-out (FIFO) to Digital Signal Processor (DSP) under the control of Complex Programmable Logic Device (CPLD). This paper adopts JPEG algorithm for image coding, and the compressed data in DSP was stored to Compact Flash (CF) card. TMS320C6211 DSP is mainly used for image compression and data transporting. Fast Discrete Cosine Transform (DCT) algorithm and fast coefficient quantization algorithm are used to accelerate operation speed of DSP and decrease the executing code. At the same time, proper address is assigned for each memory, which has different speed;the memory structure is also optimized. In addition, this system uses plenty of Extended Direct Memory Access (EDMA) to transport and process image data, which results in stable and high performance.
authors.affiliation: Key Lab of Biomechanics and Tissue Engineering under the State Education Ministry, Bioengineering College, Chongqing University, Chongqing 400044, China. yangli-whf@163.com
authors.forename: Li
authors.initials: L
authors.lastname: Yang
authors.forename: Chenglin
authors.initials: C
authors.lastname: Peng
authors.forename: Huafeng
authors.initials: H
authors.lastname: Wu
authors.forename: Dechun
authors.initials: D
authors.lastname: Zhao
authors.forename: Jinhua
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000465:Algorithms; D053704:Capsule Endoscopy / Q000379:methods*; D044962:Data Compression / Q000379:methods*; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D012984:Software