使用imatest软件帮助校正畸变

Imatest的测试卡和软件可以帮助用户测量和分析成像系统的特性和参数。很多时候，这些测试结果被用来作为图像质量的度量，或者预测你拍摄图像质量的极限水平。

YOUYIXIEImatestJICHUDECESHIJIEGUO，SHIKEYIYONGYUTUXIANGXIAOZHENGDE。KEZHIJIEYONGLAIJIUZHENGCELIANGCHUDEWUCHA。BUBIGOUMAIXINDEYINGJIAN，WUXUZHUGUANPANDUAN，YOUSHIHOUWENTIDEJIEJUEFANGFAKEYISHIYIGESHUXUEMOXINGHEJIANDANDEJISUAN。YIDANNICELIANGLEImatestDEZHEIXIECANSHU，NIKEYIJIUZHENGTAMEN，CONGERZUIDAXIANDUDIJIANSHAO（HUOWANQUANQUCHU）TAMENZAOCHENGDEYINGXIANG。ZHEITONGCHANGSHITONGGUOYIGEZHUANYONGDETUXIANGXINHAOCHULIXINPIAN（ISP）WANCHENGDE，CONGYUANSHICHUANGANQISHUJURAWZHUANHUANCHENGYIFUHESHIDETUPIAN。

ZAIImatestZHONG，WOMENFEIZHENGSHIDICHENGZHIWEI“BIHUAN”，TAWANCHENGLECONGCESHIXIANGJIDAOXIAOZHENGXIANGJIDEXUNHUAN（MOUZHONGXINGSHIDEDIAOZHENG）。

JINTIAN，WOMENYAOTANTANRUHECONGImatestZHONGTIQUJINGXIANGJIBIANDECELIANGSHUJU，BINGYONGTAMENLAIXIAOZHENGXIANGJIDEJIBIAN（WUXUGOUMAIXINDEJINGTOU）。

SHIYONGImatestBANGZHUXIAOZHENGJIBIAN

JINGXIANGJIHESHIZHEN

JIHESHIZHEN，YONGLAIDEMIAOSHUTUXIANGDENIUQUXINGZHUANG，YUXIANGJIZHENZHENGZUNXUNYIGEJIANDANDEZHENKONGXIANGJIMOXINGCHENGXIANGQINGKUANGJINXINGDUIBI。（YINCI，WOMENBUSHIZAIZHEILITANLUNTOUSHISHIZHEN）。ZUIMINGXIANDEXIAOGUOSHI，CHANGJINGZHONGDEZHIXIANWANQUCHENGTUXIANGZHONGDEQUXIAN。

JIHESHIZHENBINGBUZONGSHIJIANHUAISHI——YOUSHIYEHUIWEIYISHUXIAOGUOXUANZEQUXIANJINGTOU，HUOSHIYONGGUANGJIAOJINGTOUSHIHULVEJIBIAN，YINWEIZHEIJIUSHIXINSHANGZHEQIWANGKANDAODEQINGKUANG。RANER，YONGHUDEYANJIUBIAOMING，DADUOSHUGUANZHONGDUIMEITIANKANDAODETUPIANDEJIBIANCHENGDU，ZHUGUANJIESHOUDUSHIYOUXIANDE。

TEZHENGHUA（HEXIAOZHENG）JIHESHIZHENSHIXUDUOYINGYONGCHANGJINGSUOXUYAODE，BIRUZAISANWEIKONGJIANZHONGDINGWEIYIGEDIAN，DUIYUJISUANJISHIJUEHUOJIAODUOZHANGTUXIANGPINJIEZAIYIQIDEVRYINGYONGDENGDENG，DOUXUYAOJINGQUEDEXIAOZHENG。

ZHEIZHONGJIHESHIZHENJIHUZONGSHIYOUYUJINGTOUDESHEJIHEJIEGOUDAILAIDE，TATONGCHANGBEIJIANMOWEI（1）CHUNJINGXIANGHE（2）JINGXIANGDUICHENG。

CHUNJINGXIANGJIBIANYIWEIZHEWULUNZAIXIANGCHANGZHONGDENAYIGEDIAN，WEIYIJUEDINGJIBIANDEYINSUSHI，TALITUXIANGDEZHONGXINYOUDUOYUAN。（WEILEJIANDANQIJIAN，WOMENZAICIJIADINGTUXIANGDEZHONGXINSHIXITONGDEGUANGXUEZHONGXIN，JINGUANZHEITONGCHANGSHIXUYAOTIQIANCELIANGDE。）JIASHEJIHESHIZHENSHIJINGXIANGDE，KEYIJIANSHAOWENTIDEFUZAXING。YINWEIWUXUKAOLVERWEITUXIANGDELIANGGEWEIDU（xHEyBIAOSHIZAIMEIGEXIANGSUDEWEIZHI），WOMENZHIXUYAOQUEDINGYIGEWEIDU（BANJINGFANGXIANGDEWEIYI）。

TONGGUOSHIYONGSFRPlus，Checkboard，HUODot PatternMOKUAI，ImatestKEYICONGYIFUPAISHEGUODECESHIKATUPIANLAICELIANGXIANGJIXITONGDEJINGXIANGSHIZHEN。

ImatestZHONGDEJIBIANXISHU

ImatestKEYIFANHUILIANGZHONGBUTONGLEIXINGJINGXIANGJIBIANDEMIAOSHU。ZHEILIANGZHONGJIBIANDOUSHIYONGDUOXIANGSHIJINSIDESHIZHENHANSHUMIAOSHUDE，DANZHEILIANGGEDUOXIANGSHIDAIBIAOBUTONGDEDONGXI。ZAIXUDUOQINGKUANGXIA，TAMENZAIGONGNENGSHANGSHIXIANGTONGDE，BINGQIEKEYICONGYIZHONGXINGSHIZHUANHUANWEILINGYIZHONGXINGSHI。（WEIJIANDANQIJIAN，WOMENHULVELEZHEILIImatestTIGONGHEBIAOZHUDEtan/arctan BIJINZHI）

WOMENZUORUXIADINGYI：

* rd是一个点的畸变半径，也就是它到图像中心的距离
* ru是一个点未畸变的半径，在未畸变的图像中它到图像中心的距离

* HANSHUrd=f(ru)BEICHENGWEIZHENGXIANGBIANHUANYINWEITACAIYONGLEYIGEWEIJIBIANDEBANJINGZHI，BINGBATAZHUAN     HUAWEIYIGEJIBIANDEBANJING。YEJIUSHISHUO，TASHIYONGYUJINGTOUFASHENGJIBIANDEDIAN。

* HANSHUru=f−1(rd)BEICHENGWEIFANXIANGBIANHUAN，SHIWEILEYUZHENGXIANGBIANHUANJINXINGDUIBI，TAXIAOZHENGLEJING  TOUDEJIBIANZHI

* P（⋅）BIAOSHIYIGEDUOXIANGSHIHANSHU

SFRplus和Checkboard模块会返回描述纠正畸变的反向变换后的畸变系数，ru=f-1(rd)，下方为Rescharts模块的分析结果：

Dot PatternMOKUAIFANHUIYIGEBUTONGCANSHUDEJINGXIANGJIBIANDEDUOXIANGSHIDEXISHU，CHENGWEIJUBUJIHESHIZHEN（LGD），HUOYOUSHIYECHENGWEIGUANGXUEJIBIAN。YIXIASHIJIYUISO 17850HECPIQBIAOZHUNJICHUDECESHIJIEGUO。

JIYUCPIQDEJIBIANFENXIJIEGUO

LGDBEIDINGYIWEIXIANGDUIYUZHENSHIWUCHADEJINGXIANGWUCHA，WEIBAIFENBI（JICHENGYI100）：

LGD=100*（rd-ru)/ru

TONGGUOJIANGLGDKAOLVWEIYIGEXIANGDUIJIBIANTUXIANGBANJINGDEDUOXIANGSHIHANSHU，P（rd），WOMENKEYIZHONGXINANPAIZHEIGEFANGCHENGSHIDELIANGBIANCHANSHENGGENGYOUYONGDEFANGCHENG，YOULIDUOXIANGSHIDEJIBIANXIAOZHENGFANXIANGBIANHUANXINGSHI。YINCI，DIANZHUANGTUJIEGUOKEYIXIANGSFRplus/CheckboardNEIYANGYONGTONGYANGDEFANGFA（SUIRANWOMENHUIYONGGUIZEDEDUOXIANGSHINIHEJINSIDAIMASHILIZHIJIEQUDAIYOULIDUOXIANG）。

                                          ru=rd/（P（rd）/100+1）=f-1(rd)

通过再采样畸变校正

TUXIANGCHUANGANQIDEXIANGSUZHENLIEJIBENSHANGSHIYIGEGUIZEJIANGEDEWANGGEGUANGZHAOQUYANG。RANER，GUANGLUOZAISHANGMIANDEMOSHIYIJINGBEIJINGTOUNIUQULE，YINCIDANGCHUANGANQIDINGQIDIDUIGUANGJINXINGCAIYANGSHI，ZHEIXIEGUANGZAIJINRUJINGTOUZHIQIANJIUBUSHIYOUXIAODEGUANGZHAOYANGBENLE。WOMENDEBUJIUFANGANKEYIMIAOSHURUXIA：

WOMENCHUANGJIANYIGEXINDEWUSHIZHEN，GUIZEJIANGEDEWANGGE（YIGEXINDEXIANGSUZHENLIE）。ZAIMEIYIGE“XUNICHUANGANQI”XIANGSUDEWEIZHI，WOMENZHONGXINCONGSUOGUANCHADAODETUXIANGCAIYANGTUXIANGSHUJU，ZAIGAITUXIANGZHONGDEZHEIGEWEIZHI，CHUANGANQIXIANGSUYIJINGJINXINGLESHIZHENYUCE。YINCI，JIBIANTUXIANGBEIYONGWANGGEZHONGXINCAIYANG，TAJINGLILEXIANGTONGDEJIBIAN，DANCAIYANGJIEGUOHUIZAICIYOUGUILVDEZHANXIANJIANGE-YOUXIAODIXIAOCHUSHIZHEN。SHUOMINGRUXIA：

MEIGESHANGCENGDEWANGGEXIANDEJIAODIANDAIBIAOLEWOMENSHENGCHENGDEXIANGSUWEIZHI，ZAIWEIJIBIANTUXIANGZHONG（XIANGSUDEZAIWOMENDE“XUNICHUANGANQI”DEWEIZHI）。XIANRAN，WOMENZAICIYIJINGJIANSHAOLE“XIANGSU”LAIZENGJIAYIDUXING。TUXIANGDEXIABUDAIBIAOJIBIANTUXIANG，DANGWANGGEBEINIUQUHOU，CAIYANGWANGGEFUGAIZAIQISHANG。SHANGMIANDEGUIZEJIANGEDEZHENLIEWEIZHIJIANGBEIYONGCONGXIAFANGJIBIANTUXIANGDEBUGUIZECAIYANGSHUJUTIANCHONG，RUSUOSHIDENIUQUDEWANGGEJIAODIANWEIZHI。

WEILEKANDEGENGMINGXIAN，HONGSEJIANTOUCONGSHANGMIANTUXIANGDEWANGGEJIAODIANXIAJIANGDAOXIAMIANTUXIANGZHONGXIANGYINGDEWANGGEJIAODIAN。ZHEIXIEKEDUIBIJIESHUWEIZHIDELANSEJIANTOU，BIAOMINGZHEISHIFOUYOUXIANGSUQUYANGBUSHIZHEN。（HENMINGXIAN，RUGUOXIANGSUQUYANGWEIZHIMEIYOUJIBIAN，JISHIYONGLELANSEJIANTOUWEIZHI，NEIMESHUCHUTUXIANGJIANGGUIZEDECONGJIBIANDETUXIANGCAIYANG，BENSHENYEHUIJIBIAN。）

JIBIANYUWEIJIBIANDEWEIZHIDUIYING

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