A Design of Real-Time JPEG Encoder for 1.4 Mega Pixel CMOS Image Sensor SoC

Kyeong-Yuk MIN  Jong-Wha CHONG  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E88-A   No.6   pp.1443-1447
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietfec/e88-a.6.1443
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Papers Selected from 2004 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2004))
CMOS image sensor,  encoder,  JPEG,  one-chip camera,  SoC,  

Full Text: PDF>>
Buy this Article

In this paper, we propose a hardware architecture of real-time JPEG encoder for 1.4 mega pixels CMOS image sensor SoC which can be applied to mobile communication devices. The proposed architecture has an efficient interface scheme with CMOS image sensor and other peripherals for real-time encoding. The JPEG encoder supports the base-line JPEG mode, and processes motion images of which resolution is up to 1280960 (CCIR601 YCrCb 4:2:2,15 fps) by real-time processing. The JPEG encoder supports 8 types of resolution, and can serve the 4 levels of image quality through quantization matrix. The proposed JPEG encoder can transfer encoded motion pictures and raw image data from CMOS image sensor to external device through USB 2.0 and a compressed still image is stored at external pseudo SRAM through SRAM interface. And proposed core can communicate parameters of encoding type with other host by I2C. The proposed architecture was implemented with VHDL and verified for the functions with Synopsys and Modelsim. The encoder proposed in this paper was fabricated in process of 0.18 µ of Hynix semiconductor Inc.