During the research , ultrasonic signal testing system was designated by adopting transform the average value of function to nought , optimizing of collection frequency and transducer frequency 在研究過程中,采用零均值化、優化采樣頻率與探頭頻率的匹配等對超聲信號頻譜分析系統進行了標定。
The author makes a stabilized and zero mean treatment of the statistic data on the per capita annual net income of henan farmers between 1978 and 2005 , and using the property of the autocorrelation function and partial autocorrelation function of time sequence , establishes the model appropriate for the data 摘要筆者根據河南省1978年2005年的農民人均純收入統計數據,將這些數據進行平穩化、零均值化處理,并利用時間序列的自相關函數,偏自相關函數的性質,確認數據所適合的模型。
The article will put forward a kind of new denoising method of digital image in frequency domain : start with a series of fourier transforms on hand and wrist x - ray image ; then carry on single frame mean value to deal with ; finally , carry out the single frame smooth handling of frame frequency . one that is through steps the above treated , get better test result , improve the artificial accuracy that read 文章提出了一種新的圖像頻域祛噪方法:首先對采集到的手腕部骨圖像進行傅立葉變換;然后進行單幀均值化處理;最后進行單幀頻域平滑處理。通過以上步驟的處理后,得到了較好的試驗效果,大大提高了人工判讀的準確性。