CONFERENCE PROCEEDINGS
Advanced Search
Home > Proceedings > Volume 1452 > Article
Paper
1 June 1991 Signal processing LSI system for digital still camera
Mikio Watanabe, Osamu Saito, Satoru Okamoto, Kenji Ito, Kenji Moronaga, Kenkichi Hayashi, Seiki Nishi
Author Affiliations +
Proceedings Volume 1452, Image Processing Algorithms and Techniques II; (1991) https://doi.org/10.1117/12.45367
Event: Electronic Imaging '91, 1991, San Jose, CA, United States
Abstract
This paper presents a feature of an image data compression system, and the algorithm employed in a newly developed digital still camera (FUJIX Card Camera DS-H1). DS-H1 is composed of a CCD with 390K pixels, a digital signal processing unit, and image data compression units named DCT and CODER. An IC memory card of 8 Mbit SRAM is used as the recording media. DS-H1 has not only a function of an image data recording, but also a play back for the instantaneous review. A new algorithm is used for controlling a bit rate of a still frame compressed by ADCT (Adaptive Discrete Cosine Transform). The image data control is an important function for digital still camera in order to guarantee the total number of still images stored in an IC memory card. An information distribution of each image data blocks (8*8) is estimated as ACTIVITY. An adequate quantization step ((alpha) ) is calculated using ACTIVITY and parameters named K1, K2. A set of K1 and K2 suitable for the target compression ratio is transferred from CPU to CODER before the compression sequence starts. As a result of our evaluation, it is actually proved that ADCT with the control function is successfully implemented in a small camera body of DS-H1. Picture quality of the played back images is good. K1, K2 and ACTIVITY are important parameters to determine the bit rate control accuracy and the picture quality of compressed/decompressed images. Our simulation results shows that adequate K1, K2 realize a good picture quality and a high control accuracy.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation Download Citation
Mikio Watanabe, Osamu Saito, Satoru Okamoto, Kenji Ito, Kenji Moronaga, Kenkichi Hayashi, and Seiki Nishi "Signal processing LSI system for digital still camera", Proc. SPIE 1452, Image Processing Algorithms and Techniques II, (1 June 1991); https://doi.org/10.1117/12.45367
ACCESS THE FULL ARTICLE
ORGANIZATIONAL
Sign in with credentials provided by your organization.
INSTITUTIONAL
Select your institution to access the SPIE Digital Library.
SELECT YOUR INSTITUTION
PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
PERSONAL SIGN IN
No SPIE Account? Create one
PURCHASE THIS CONTENT
SUBSCRIBE TO DIGITAL LIBRARY
50 downloads per 1-year subscription
Members: $195
Non-members: $335 ADD TO CART
25 downloads per 1 - year subscription
Members: $145
Non-members: $250 ADD TO CART
PURCHASE SINGLE ARTICLE
Includes PDF, HTML & Video, when available
Members: $17.00
Non-members: $21.00 ADD TO CART
PROCEEDINGS
 10 PAGES
DOWNLOAD PAPER SAVE TO MY LIBRARY
GET CITATION
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Image compression
Cameras
Digital cameras
Image processing
Signal processing
Digital signal processing
Quantization
RELATED CONTENT
Subscribe to Digital Library
Receive Erratum Email Alert
Back to Top