Opencv2.x New Data Structure CV: mat access Element Method

After opencv2.0, the API functions of the C ++ interface have become a trend. The commonly used data structures of iplimage and cvmat have also faded out, and the new data structure CV: mat has become a new favorite. Currently, in China, the new data structure CV: mat has few materials. New data structure CV: the access (read and access) method of Mat elements is still unclear for many beginners.

Now, we will give you some comprehensive information.

// Http://blog.csdn.net/moc062066//20111128#include "opencv2/opencv. HPP "# include <iostream> using namespace STD; using namespace CV; int main (INT argc, char ** argv) {const char * filename =" google.png "; // cv_8uc3 // corresponding cv_8sc3 --- vec3s // corresponding cv_16uc3 --- vec3wmat mat_cv_8uc3 = imread (filename, imread_color); For (size_t nrow = 0; nrow <strong; nrow ++) {for (size_t ncol = 0; ncol <mat_cv_8uc3.cols; NC Ol ++) {vec3i BGR = mat_cv_8uc3.at <vec3b> (nrow, ncol); // use vec3b to perform cout <"(" <BGR. val [0] <"," <BGR. val [1] <"," <BGR. val [2] <")" ;}cout <Endl ;}for (size_t nrow = 0; nrow <mat_cv_8uc3.rows; nrow ++) {uchar * Data = mat_cv_8uc3.ptr <uchar> (nrow); For (size_t ncol = 0; ncol <mat_cv_8uc3.cols * mat_cv_8uc3.channels (); ncol ++) {cout <int (data [ncol]) ;}cout <Endl ;}// ------ cv_8uc1 ---------- Start --- // mat mat_cv_8uc1 = imread (filename, imread_grayscale); For (size_t nrow = 0; nrow <mat_cv_8uc1.rows; nrow ++) {for (size_t ncol = 0; ncol <mat_cv_8uc1.cols; ncol ++) {uchar val = mat_cv_8uc1.at <uchar> (nrow, ncol); // cout <(INT (VAL)> 200? 1: 0); // cout <int (VAL) <Endl ;}cout <Endl; For (size_t ROW = 0; row <mat_cv_8uc1.rows; ++ row) {uchar * PTR = mat_cv_8uc1.ptr <uchar> (ROW); For (size_t Col = 0; Col <mat_cv_8uc1.cols; ++ col) {cout <(INT (PTR [col])> 200? 1: 0); // cout <int (VAL) <Endl ;}cout <"\ n" ;}cout <Endl; matiterator _ <uchar> it = mat_cv_8uc1.begin <uchar> (), it_end = mat_cv_8uc1.end <uchar> (); For (int cnt = 1; it! = It_end; ++ it) {cout <(INT (* It)> 200? 1: 0); If (CNT ++ % mat_cv_8uc1.cols) = 0) cout <Endl ;}// ------ cv_8uc1 ---------- end --- return 0 ;}

Reference: 1

All images:

Result:

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(245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245)
(245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245)
(245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245)
(245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (223,226,244) (189,195,244) (169,173,241) (169,174,240) (189,193,240) (216,217,239) (242,242,242) (244,244,244) (245,245,245) (245,245,245) (245,245,245) (245,245,245)
(245,245,245) (245,245,245) (245,245,245) (245,245,245) (242,243,244) (190,197,245) (115,122,246) (239) (231, 228, 232) (239, 242) (117,116,236, 177,179,233) (238,238,238) (243,243,243) (245,245,245) (245,245,245)
(245,245,245) (245,245,245) (245,245,245) (225,228,244) (134,145,248) (244, 128,130,223) (191,192,212) (212,212,212) (213,213,213) (201,201,211) (142,142,210) (225, 238) (238, 112,106,228) (217,218,231, 241,241,241) (245,245,245)
(245,245,245) (245,245,245) (223,227,244) (118,129,248) (243, 154,158,213) (207,207,207) (215,215,215) (226,226,226) (231,231,231) (232,232,232) (227,227,227) (174,175,212) (216, 234) (234, 224) (217,218,227, 241,241,241)
(245,245,245) (236,238,245) (128,139,248) (248) (106,107,213, 201,201,201) (216,216,216) (233,233,233) (242,242,242) (244,244,244) (245,245,245) (243,243,243) (236,236,236) (143,142,209) (217, 232) (229, 217) (229,229,229)
(245,245,245) (168,178,244) (250, 236) (154,155,196, 209,209,209) (232,232,232) (243,243,243) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (244,244,244) (232,232,235) (205, 223) (228, 220) (166,168,211)
(229,231,243) (98,107,246) (248, 222) (176,177,195, 220,220,220) (240,240,240) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (243,243,243) (139,136,216) (215, 226) (217, 200)
(184,190,244) (247, 245) (213, 186,187,197) (226,226,226) (243,243,243) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (202,203,231) (212, 223) (215, 195)
(143,151,242) (245, 241) (213, 185,186,199) (228,228,228) (243,243,243) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (233,233,239) (214, 221) (212, 190)
(106,114,244) (243, 239) (217, 169,170,199) (227,227,227) (243,243,243) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (244,244,244) (216, 220) (209, 183)
(113,120,239) (238, 239) (221, 146,147,200) (224,224,224) (242,242,242) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (116,106,221) (219, 203) (173)
(146,150,229) (229, 236) (225, 113,111,203) (219,219,219) (239,239,239, 245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (121,113,224) (218, 194) (165)
(191,194,232) (216, 228) (229, 214) (209,210,212) (236,236,236, 245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (116,105,225) (214) (178, 165)
(238,238,240) (208, 214) (227, 224) (161,163,207, 230,230,230) (244,244,244, 245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (224, 201) (159, 146,144,179)
(244,244,244) (182,183,221) (195, 211) (225, 217) (219,219,219, 239,239,239) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (216,217,239) (217, 174) (161, 197,197,197)
(245,245,245) (240,240,240) (122,118,201) (185, 206) (223, 126,124,216) (230,230,230) (243,243,243) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (122,112,227) (191, 160) (181,181,189) (211,211,211)
(245,245,245) (244,244,244) (235,235,235) (116,107,190) (174, 196) (217, 128,122,219) (224,225,232) (242,242,242) (245,245,245) (245,245,245) (232,232,243) (132,120,229) (197, 171) (179,179,192, 207,207,207) (229,229,229)
(245,245,245) (245,245,245) (243,243,243) (232,232,232) (158,156,199) (67,51, 170) (178, 201) (216, 121,112,223) (141,134,228) (117,105,225) (212, 193) (131,125,191, 201,201,203) (210,210,210) (228,228,228) (240,240,240)
(245,245,245) (245,245,245) (245,245,245) (243,243,243) (234,234,234) (219,219,220) (162,160,195) (120,113,182) (183) (189, 196) (115,105,200) (153,149,202) (201,201,209) (210,210,210) (218,218,218) (232,232,232) (241,241,241) (244,244,244)
(245,245,245) (245,245,245) (245,245,245) (245,245,245) (244,244,244) (239,239,239) (232,232,232) (223,223,223) (216,216,216) (211,211,211) (211,211,211) (214,214,214) (217,217,217) (222,222,222) (230,230,230) (237,237,237) (243,243,243) (245,245,245) (245,245,245)
(245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (245,245,245) (244,244,244) (241,241,241) (237,237,237) (234,234,234) (233,233,233) (234,234,234) (236,236,236) (240,240,240) (243,243,243) (245,245,245) (245,245,245) (245,245,245) (245,245,245)
245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245
245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245
245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245
245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245245
245245245245245245245245245245245245245245245245245245245245245223226244189195244169173241169174240189193240216217239242242242244244244245245245245245245245245245245245245
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245245245245245245245245245245245245245245245245245245244244244241241241237237237234234234233233233234234234236236236240240240243243243245245245245245245245245245245245245
1111111111111111111
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