光电技术应用
光電技術應用
광전기술응용
ELECTRO-OPTIC WARFARE & RADAR PASSIVE COUNTERMEASURES
2013年
1期
42-46
,共5页
图像压缩%图像编码%小波变换%FPGA
圖像壓縮%圖像編碼%小波變換%FPGA
도상압축%도상편마%소파변환%FPGA
image compression%image encoding%wavelet transformation%field-programmable gate ar?ray (FPGA)
高帧频相机需要较长时间记录目标状态的图像信息,由于记录介质的存储容量所限,需要对图像进行实时压缩、记录与传输.EZW和SPIHT两种编码方法速度慢,不易在FPGA上实现,且对缓存要求较高.根据小波变换后小波系数的冗余及分布特性,提出一种新的编码算法,通过直接对系数大小做比较,然后结合数值特性和分布特性对小波系统进行动态分组,用较少的存储空间记录图像系数信息.该算法适合在FPGA上实现,实验结果验证了方法的可行性.
高幀頻相機需要較長時間記錄目標狀態的圖像信息,由于記錄介質的存儲容量所限,需要對圖像進行實時壓縮、記錄與傳輸.EZW和SPIHT兩種編碼方法速度慢,不易在FPGA上實現,且對緩存要求較高.根據小波變換後小波繫數的冗餘及分佈特性,提齣一種新的編碼算法,通過直接對繫數大小做比較,然後結閤數值特性和分佈特性對小波繫統進行動態分組,用較少的存儲空間記錄圖像繫數信息.該算法適閤在FPGA上實現,實驗結果驗證瞭方法的可行性.
고정빈상궤수요교장시간기록목표상태적도상신식,유우기록개질적존저용량소한,수요대도상진행실시압축、기록여전수.EZW화SPIHT량충편마방법속도만,불역재FPGA상실현,차대완존요구교고.근거소파변환후소파계수적용여급분포특성,제출일충신적편마산법,통과직접대계수대소주비교,연후결합수치특성화분포특성대소파계통진행동태분조,용교소적존저공간기록도상계수신식.해산법괄합재FPGA상실현,실험결과험증료방법적가행성.
It takes a long time for high speed frame cameras to record image information of target states. The images need to be compressed, recorded and transmitted in real time for limited storage capaci?ty of record medium. The speed of EZW and SPIHT coding methods are both too slow to work out on field-programmable gate array (FPGA) and they need high quality buffer storage. A new coding algorithm has been proposed based on redundancy and distribution characteristics of wavelet coefficients after wave?let transformation. Wavelet systems are grouped dynamically by directly comparing with magnitude of co?efficients and incorporating characteristics of numbers and distributions. Less memory space is used to re?cord coefficient information of images. The algorithm is suitable for FPGA. The feasibility of the method is verified by experiments.
