五分钟看懂镜头调制传递函数MTF

YINGXIANGPAISHEZHILIANGZUIZHONGYAODEYINSUSHIJINGTOUDEFENBIANLVHEFANCHA。FANCHADAXIAOKEYITONGGUOYIQIHENRONGYICELIANG，ERFENBIANLVJIUBUNEIMERONGYILE!XIANZAIWOMENJINGCHANGCAIYONGPAISHEBIAOZHUNFENBIANLVKADEFANGFACELIANGJINGTOUDEFENBIANLV。YOUYUZHEIZHONGFANGFAHAISHIYAOSHOUDAORENGONGPANDUDEZHUGUANYINGXIANG，SUOYIBINGBUSHIZUIZHUNQUEZUILIXIANGDEFANGFA。

XIANZAI，RANGWOMENCONGLINGYIGEJIAODUCHUFA，JIANGJINGTOUKANZUOYIGEXINXICHUANDIXITONG：BEIPAISHEJINGWUFANSHECHULAIDEGUANGXIANSHITADESHURUXINXI，ERTUPIANSHANGDECHENGXIANGJIUSHITADESHUCHUXINXI。YIGEYOUXIUDEJINGTOUYIWEIZHETADESHUCHUDEXIANGZHENSHIDEZAIXIANLESHURUFANGJINGWUDETEXING。

YOUSHUXUEZHENGMINGKEZHI，RENHEZHOUQIXINGTUXINGDOUKEYIFENJIECHENGLIANGDUANZHENGXIANBIANHUADETUXINGDEDIEJIA，ERRENHEFEIZHOUQITUXINGYOUKEYIKANZUOSHIZHOUQITUXINGPIANDUANDEZUHE。YINCI，YANJIUJINGTOUDUIZHENGXIANBIANHUADETUXINGDEFANYING，JIUKEYIYANJIUJINGTOUDEXINGNENG!LIANGDUANZHENGXIANBIANHUADEZHOUQITUXINGJIAOZUO“ZHENGXIANGUANGZHA”。WEILEMIAOSHUZHENGXIANGUANGZHADEXIANTIAOMIDU，WOMENYINRULE“KONGJIANPINLV”DEGAINIAN。YIBANZHENGXIANBODEPINLVZHIDANWEISHIJIAN(MEIMIAOZHONG)ZHENGXIANBODEZHOUQISHU，DUIYINGDE，ZHENGXIANGUANGZHADEKONGJIANPINLVJIUSHIDANWEIZHANGDU(MEIHAOMI)DELIANGDUANZHAOZHENGXIANBIANHUADETUXINGDEZHOUQISHU。

TU1 ZHENGXIANGUANGZHA

DIANXINGDEZHENGXIANGUANGZHARUSHANGTUSUOSHI。XIANGLINDELIANGGEZUIDAZHIDEJULISHIZHENGXIANGUANGZHADEKONGJIANZHOUQI，DANWEISHIHAOMI。KONGJIANZHOUQIDEDAOSHUJIUSHIKONGJIANPINLV(Spatial Frequency)，DANWEISHIXIANDUI/HAOMI(lp/mm， linepairs/mm)。ZHENGXIANGUANGZHAZUILIANGCHUYUZUIANCHUDECHABIE，FANYINGLETUXINGDEFANCHA(DUIBIDU)。SHEZUIDALIANGDUWEIImax，ZUIXIAOLIANGDUWEIImin，WOMENYONGDIAOZHIDU(Modulation)BIAOSHIFANCHADEDAXIAO。DIAOZHIDUMDINGYIRUXIA：

M=(Imax－Imin)/(Imax＋Imin)

HENMINGXIAN，DIAOZHIDUJIEYU0HE1ZHIJIAN。DIAOZHIDUYUEDA，YIWEIZHEFANCHAYUEDA。DANGZUIDALIANGDUYUZUIXIAOLIANGDUWANQUANXIANGDENGSHI，FANCHAWANQUANXIAOSHI，ZHEISHIDEDIAOZHIDUDENGYU0。

WOMENJIANGZHENGXIANGUANGZHAZHIYUJINGTOUQIANFANG、ZAIJINGTOUCHENGXIANGCHUCELIANGXIANGDEDIAOZHIDU，FAXIANDANGGUANGZHAKONGJIANPINLVHENDISHI，XIANGDEDIAOZHIDUJIHUDENGYUZHENGXIANGUANGZHADEDIAOZHIDU；SUIZHEKONGJIANPINLVDETIGAO，XIANGDEDIAOZHIDUZHUJIANDANDIAOXIAJIANG；KONGJIANPINLVGAODAOYIDINGCHENGDU，XIANGDEDIAOZHIDUZHUJIANJIANGDIDAO0、WANQUANSHIQULEFANCHA!

正弦信号通过镜头后，它的调制度的变化是正弦信号空间频率的函数，这个函数称为调制传递函数MTF(Modulation Transfer Function)。对于原来调制度为M的正弦光栅，如果经过镜头到达像平面的像的调制度为M ’ ，则MTF函数值为：
MTF值= M ’/ M

KEYIKANCHU，MTFZHIBIDINGJIEYU0HE1ZHIJIAN，BINGQIEYUEJIEJIN1、JINGTOUDEXINGNENGYUEHAO!

RUGUOJINGTOUDEMTFZHIDENGYU1，JINGTOUSHUCHUDEDIAOZHIDUWANQUANFANYINGLESHURUZHENGXIANGUANGZHADEFANCHA；ERRUGUOSHURUDEZHENGXIANGUANGZHADEDIAOZHIDUSHI1，ZESHUCHUTUXIANGDEDIAOZHIDUZHENGHAODENGYUMTFZHI!SUOYI，MTFHANSHUDAIBIAOLEJINGTOUZAIYIDINGKONGJIANPINLVXIADEFANCHA。

MTFZONGHEFANYINGLEJINGTOUDEFANCHAHEFENBIANLVTEXING， MTFSHIYONGYIQICELIANGDE，YINERKEYIWANQUANPAICHUKEGUANYINSUDEYINGXIANGHERENGONGPANDUDEZHUGUANYINSUYINGXIANG，SHIMUQIANZUIWEIKEGUANZUIWEIZHUNQUEDEJINGTOUPINGJIAFANGFA。MTFZHIBUDANSHOUJINGTOUXIANGCHAYINGXIANG，HAIYAOSHOUDAOKONGJIANPINLV、GUANGQUANHEXIANGCHANGDAXIAOSANGEBIANLIANGDEYINGXIANG，SUOYIYIBANHUIZHIERWEIDEMTFQUXIANSHIDOUSHIGUDINGKONGJIANPINLV、GUANGQUANHEXIANGCHANGSANGEBIANLIANGZHONGDELIANGGE、SHENGYUYIGEZUOWEIHENGZUOBIAO，BINGQIEYIMTFZHIZUOWEIZONGZUOBIAO。

JINGTOUSHIYIGUANGZHOUWEIZHONGXINDEZHONGXINDUICHENGJIEGOU，XIANGCHANGZHONGXINGEGEFANGXIANGDEMTFZHISHIXIANGTONGDE。DANSHISHOUDAOJINGTOUXIANGSANDEYINGXIANG，ZAIPIANLIZHONGXINDEWEIZHI，YANQIEXIANFANGXIANGDEXIANTIAOYUYANJINGXIANGFANGXIANGDEXIANTIAODEMTFZHIWANGWANGSHIBUTONGDE!WOMENJIANGPINGXINGYUZHIJINGDEXIANTIAOCHANSHENGDEMTFQUXIANCHENGWEIHUSHIQUXIAN，BIAOWEIS (sagittal)，ERJIANGPINGXINGYUQIEXIANDEXIANTIAOCHANSHENGDEMTFQUXIANCHENGWEIZIWUQUXIAN，BIAOWEIM(meridional)。ZHEIYANG，WOMENHUIZHIDEMTFQUXIANYIBANYOULIANGTIAO：SQUXIANHEMQUXIAN。 

TU2ZIWUFANGXIANGHEHUSHIFANGXIANG

KONGJIANPINLVHENDISHI，MTFZHIQUYUYIGEJIEJINYU1DEGUDINGZHI。ZHEIGEZHISHIJIJIUSHIJINGTOUDUIDAMIANJISEKUAIDEFANCHA，FANYINGLEJINGTOUGUYOUDEFANCHAZHI。SUIZHEKONGJIANPINLVZENGGAO，MTFZHIZHUJIANXIAJIANG，ZHIDAOQUYU0。RENYANDUIFANCHAWEI0.05DEYINGXIANGSHANGNENGFENBIAN，ERDANGFANCHADIYU0.02SHIJIUWANQUANBUNENGCHAJUELE。SUOYIYIBANXUANDINGMTFZHIWEI0.03SHIDEKONGJIANPINLVZUOWEIJINGTOUDEMUSHIFENBIANLV。ZHEIYANG，TONGGUOMTFQUXIANDEHUIZHI，JINGTOUDEFANCHAHEMUSHIFENBIANLVJIUDOUCHENGWEIKECELIANGDELE!

TU3SHIMTFZHISUIKONGJIANPINLVBIANHUADEQINGKUANG，WOMENCHENGZHIWEI“PINFUQUXIAN”。TUZHONG，GENJUDIPINSHIDEMTFZHIHEMTFDENGYU0.03SHIDEKONGJIANPINLV，KEYIFANGBIANDEDECHUJINGTOUDEFANCHAHEMUSHIFENBIANLV。

TU4SHISANZHIBUTONGJINGTOUDEMTFPINFUQUXIANDUIBI，QUXIANA(HONGSE)DIPINDUANMTFZHIHENGAOFANYINGCHUTAYOUHENGAODEFANCHA，ERGAOPINDUANMTFZHIJIAOGAOFANYINGCHUTADEFENBIANLVYEBUCUO，SHIYIZHIZONGHEXINGNENGJIAOGAODEJINGTOU。QUXIANB(LANSE)ZAIKONGJIANPINLVJIAODISHIBIAOXIANCHUHENGAODEMTFZHI，SHUOMINGTAYOUJIAOHAODEFANCHA；ERZAIKONGJIANPINLVJIAOGAOSHIMTFZHIHENDI，BIAOMINGTADEFENBIANLVJIAOCHA。QUXIANC(LVSE)ZAIKONGJIANPINLVJIAODISHIMTFZHIBINGBUGAO，SHUOMINGTADEFANCHAJIAOCHA；ERZAIKONGJIANPINLVHENGAOSHITADEMTFZHIXIAJIANGJIAOSHAO，BIAOMINGTADEFENBIANLVJIAOGAO。YIBANDE，WOMENKEYIBIJIAOMTFQUXIANXIABUBAOWEIDEKONGJIANLAIDAZHIPANDUANJINGTOUZHILIANG，MTFQUXIANBAOWEIDEKONGJIANYUEDAYUEHAO。

TU3 SUIKONGJIANPINLVBIANHUADEMTFQUXIAN

TU4 LIYONGMTFQUXIANPANDUANJINGTOUZHILIANG

DALIANGCHANPINCELIANGDESHIJIYINGYONGZHONG，WEILEJIANHUACELIANG，WANGWANGZHICECHUTEDINGTIAOJIANXIAXIANGCHANGZHONGTEDINGDIANDEMTFZHI，ZUOWEIPINGJIAJINGTOUDEJIBENBIAOZHUN。ZHIYAOZAITEDINGTIAOJIANXIACELIANGDEMTFZHIDAYUBIAOZHUN，JIUKEYIRENWEIJINGTOUSHIHEGEDE。

WOGUOGUOJIABIAOZHUNGB9917-88ZHONGGUIDINGLESHEYINGJINGTOUZAITEDINGKONGJIANPINLVXIAPINGJIACHENGXIANGZHILIANGDEMTFBIAOZHUN，RUXIALIEBIAO1、BIAO2SUOSHI。

BIAO1 135XIANGJI(36mm*24mm)SHEYINGJINGTOUDEMTFBIAOZHUN

BIAO2 120XIANGJI(56mm*54mm)SHEYINGJINGTOUDEMTFBIAOZHUN

ZAITEDINGTIAOJIANXIACELIANGDEMTFZHIZHIYAODAYUDENGYUGUOJIABIAOZHUNJIWEIHEGE!

YISHANGBIAOZHUNQISHIZHIGUIDINGLEHEGEJINGTOUMTFDEZUIDIXIANDU，ZHUANYESHEYINGRENYUANHESHEYINGAIHAOZHEDUISHEYINGJINGTOUZHILIANGYOUZHEGENGGAODEYAOQIU。WEICI，XUDUOCHANGJIAGONGBULEZIJISHEYINGJINGTOUDEMTFQUXIANGONGYONGHUCANKAO，YOUXIEDULICELIANGJIGOUYEDUISHICHANGSHANGGEZHONGJINGTOUDEMTFJINXINGLECESHI，GONGBULECESHIJIEGUODEMTFQUXIAN。WEILEBIANYULEJIEJINGTOUXIANGCHANGNEIDETEXING，ZHEIXIEQUXIANDADUOCAIYONGDAOXIANGCHANGZHONGXINDEJULIZUOWEIHENGZUOBIAO，WOMENCHENGZHIWEI“CHANGFUQUXIAN”。

TU5SHIJIANENGSHOUJICAIPIAOWANGGONGBUDEBIAOZHUNJINGTOUEF50mm/F1.4 USMDEMTFQUXIAN。TUZHONGGONGYOU8TIAOQUXIAN，HENGZUOBIAOSHICELIANGDIANDAOXIANGCHANGZHONGXINDEJULI，DANWEISHIHAOMI。ZONGZUOBIAOSHIMTFZHI。CUXIANSHIKONGJIANPINLVWEI10XIANDUI/HAOMIDEJIEGUO，XIXIANSHI30XIANDUI/HAOMIDE；HEISEQUXIANSHIZUIDAGUANGQUAN(DUIYUZHEIGEJINGTOUSHIF1.4)DE，LANSEQUXIANSHIGUANGQUANF8(YIBANSHIZUIJIAGUANGQUAN)DE；SHIXIANSHISQUXIAN(HUSHIQUXIAN)，XUXIANSHIMQUXIAN(ZIWUQUXIAN)。

CONGTU5DELANSEXIANTIAOWOMENKEYIKANCHU，DAIBIAOFANCHADEDIPINCUXIANHENGAO，JIEJINYU1，SHUOMINGGAIJINGTOUZAIF8DEZUIJIAGUANGQUANYOUZHEFEICHANGHAODEFANCHA。DAIBIAOFENBIANLVDEXIXIANYEZAI0.86YISHANG，SHUOMINGCIGUANGQUANXIAFENBIANLVJIYOU。LANSEQUXIANZHIDAOJULIZHONGXIN18HAOMIZUOYOUYIRANPINGZHI、JINZAIBIANYUANLVEYOUXIAJIANG，SHUOMINGGAIJINGTOUXIANGCHANGNEIZHENGGEYOUZHEYIZHIDETEXING，BIANJIAOFENBIANLVLVEYOUYIDIANXIAJIANG。SHIXIANYUXUXIANJULIHENJIN，FANYINGCHUGAIJINGTOUXIANGSANYEHENXIAO。HEISEQUXIANFANYINGCHUZAI1.4DEDAGUANGQUANTIAOJIANXIA，WULUNSHIFANCHA(CUXIAN)HAISHIFENBIANLV(XIXIAN)DOUYOUMINGXIANDEXIAJIANG，ERQIEBIANYUANXIAJIANGGENGWEILIHAI。

TU5 JIANENGEF50/1.4 USMBIAOZHUNJINGTOUDEMTFQUXIAN

BIAO3 TU5DETULI

ZHEIZHONGMTFDE“CHANGFUQUXIAN”SHICHANGJIAHUODISANFANGTIGONGDEMTFQUXIANZUICHANGJIANDEXINGSHI，TONGGUODUITADEFENXI，KEYILEJIEJINGTOUDEZHUYAOGUANGXUETEXING，DUIJINGTOUCHENGXIANGZHILIANGYOUQUANMIANZONGHELEJIE。

YIBANDEMTFTUTIGONGLIANGZUBUTONGKONGJIANPINLVDECHANGFUQUXIAN，FENBIEDAIBIAOFANCHAHEFENBIANLV：DIPINXUANZAIMTFPINFUQUXIANSHUIPINGBUFEN，FANYINGJINGTOUDEFANCHATEXING；GAOPINXUANZAIMTFPINFUQUXIANXIAJIANGBIJIAODOUQIAODEBUFEN，FANYINGJINGTOUDEFENBIANLVTEXING。

深圳市赛麦吉图像技术有限手机彩票网致力于以先进的技术为用户提供优质的产品和服务。您可以通过电话联系我们：400-666-2522 或访问我们的官网：hmmp8.com