The algorithm , basing on convolution filtering technique and the fringes " gray values max - min distribution , can automatically and accurately carry out space frequency spectra shifting without spectra analysis and spectrogram in the technique of phase method of projected grating for 3 - d object shapes measurement . the new algorithm makes image processing much caster and the technique of object shapes measurement more automated . the phase error caused by filtering and the crossed - optical - axes geometry setup is also discussed 本文采用投影光棚相位法和數(shù)字卷積濾波技術(shù):根據(jù)柵線的條紋灰度值分布具有極大極小分布的特性,提出卷積濾波形貌光學(xué)自動(dòng)檢測(cè)的圖像處理方法,有效地實(shí)現(xiàn)了頻譜自動(dòng)移位,從而進(jìn)一步提高了圖像處理的速度和形貌測(cè)量技術(shù)的自動(dòng)化程度;同時(shí)對(duì)采用兩光學(xué)主軸相交,且非遠(yuǎn)心投影系統(tǒng)所產(chǎn)生的誤差進(jìn)行了分析,并提出了修正方法。