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使用imatest软件帮助校正畸变

浏览: 手机彩票网日期:2017-08-04

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)。

使用Imatest帮助校正畸变

 

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:

Imatest畸变分析结果

 

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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