摘要
提出一种彩色图像压缩算法,该方法以离散余弦变换为基础。首先,对RGB图像进行颜色空间转换、分块、DCT、阈值量化的预处理。其次,利用Zig-Zag、垂直、水平、Hilbert四种扫描曲线对预处理后的分块图像数据进行扫描并分为非零向量和间隔索引向量,利用每个块的间隔索引向量作为特征量来独立选择最合适的曲线,从而形成自适应过程。最后,对每个块进行编码形成压缩图像。实验结果表面,该方法具有较好的压缩效果。
A color image compression algorithm based on discrete cosine transform(DCT)is proposed.Firstly,the color space conversion,partitioning,DCT and threshold quantization are preprocessed for RGB images.Secondly,scan curves of Zig-Zag,vertical,horizontal and Hilbert are used to scan the pre-processed block image data and divide it into non-zero vector and interval index vector.The interval index vector of each block is used as the feature quantity to independently select the most appropriate curve,thus forming an adaptive process.Finally,each block is encoded to form a compressed image.Experimental results show that this method has a good compression effect.
作者
李鹏
史峰
LI Peng;SHI Feng(Jiangsu Key Laboratory of Meteorological Observation and Information Processing,Nanjing University of Information Science and Technology,Nanjing Jiangsu 210044,China;BinJiang College,Nanjing University of Information Science and Technology,Wuxi Jiangsu 214105,China;Jiangsu Meteorological Sensor Network Technology Engineering Center,Nanjing University of Information Science and Technology,Nanjing Jiangsu 210044,China)
出处
《电子器件》
CAS
北大核心
2021年第3期640-646,共7页
Chinese Journal of Electron Devices
基金
国家自然科学基金项目(41075115)
江苏省第11批六大高峰人才项目(2014-XXRJ-006)
江苏省重点研发计划社会发展项目(BE201569)
无锡市社会发展科技示范工程项目(N20191008)。
关键词
图像压缩
离散余弦变换
自适应
压缩编码
最佳扫描曲线
image compression
discrete cosine transform
adaptive
compression coding
optimum sweep curve
