CAJ | 학술논문

弹栽图像压缩系统要求压缩算法在保证图像质量的前提下对图像实现大压缩比实时压缩.针对这些要求,提出了采用小波编码算法作为图像压缩系统的实现算法和DSP作为算法的实现平台.小渡压缩算法分为两个部分,即先对图像进行整型提升小波变换,再利用SPIHT(Set Partitioning in Hierarchical Trees)算法对变换结果进行编码.对小渡编码过程中存在重复运算和存储量大的缺点进行了改进,使之适合于DSP并行处理.实验结果表明,改进的算法与原算法相比,重构图像的峰值信噪比相当,大于28dB,满足图像质量要求;图像压缩速度达到20帧/s,完全满足实时性要求.
탄재도상압축계통요구압축산법재보증도상질량적전제하대도상실현대압축비실시압축.침대저사요구,제출료채용소파편마산법작위도상압축계통적실현산법화DSP작위산법적실현평태.소도압축산법분위량개부분,즉선대도상진행정형제승소파변환,재이용SPIHT(Set Partitioning in Hierarchical Trees)산법대변환결과진행편마.대소도편마과정중존재중복운산화존저량대적결점진행료개진,사지괄합우DSP병행처리.실험결과표명,개진적산법여원산법상비,중구도상적봉치신조비상당,대우28dB,만족도상질량요구;도상압축속도체도20정/s,완전만족실시성요구.
Wavelet code algorithm is adopted because compression algorithm is required to large-ratio and real-time compress images by missile-borne compression system under the condition of the guarantee of image quality,and DSP (Digital Signal Processor) is selected as the processor of algorithm.Wavelet code algorithm is composed of two step:images are transformed by integer lifting scheme,and the transform results are coded by SPIHT(Set Partitioning in Hierarchical Trees) algorithm.Wavelet code algorithm is improved to be fit for DSP parallel process for it has some defections such as many repeat calculations,and consuming a large number of memories.Experiment results show that the peak signal-to-noise ratio (PSNR) of improved algorithm is larger than 28dB and is as much as original algorithm, which can meet the requirement of image quality; the compression speed is 20 frames per minute,which totally meets realtime compression requirement