OPENCV Official Document Learning record (5)

Random number Generation classes: RNG and text rendering

1#include <opencv2\opencv.hpp>2#include <iostream>3#include <string>4 5 #pragmaComment (linker, "/subsystem:\" windows\ "/entry:\" Maincrtstartup\ "")6 7 #defineNumber 208 9 using namespacestd;Ten using namespaceCV; One  A voidShow (std::stringname,mat img) - { - Namedwindow (name, cv_window_autosize); the imshow (Name, IMG); - } -  - StaticScalar Randomcolor (RNG &rng) + { -     returnScalar (Rng.uniform (0,255), Rng.uniform (0,255), Rng.uniform (0,255)); + } A  at voidDrawing_random_lines (Mat img,Char*win_name, rng&rng) - { -     intLinetype =8; -     intW = -; - Point pt1, pt2; -     intX_1 =0, x_2 =W; in  -      for(inti =0; I < number; ++i) to     { +pt1.x =Rng.uniform (x_1, x_2); -PT1.Y =Rng.uniform (x_1, x_2); thept2.x =Rng.uniform (x_1, x_2); *PT2.Y =Rng.uniform (x_1, x_2); $ Panax NotoginsengLine (IMG, PT1, pt2, Randomcolor (RNG), Rng.uniform (1,Ten),8); - Show (Win_name, IMG); the     } + } A  the voidDisplay_random_text (Mat img,Char*win_name, RNG &rng) + { -     intLinetype =8; $     intW = -; $     intX1 =0, x2 =W; -  -      for(inti =0; I < number; ++i) the     { - Point org;Wuyiorg.x =rng.uniform (x1, x2); theORG.Y =rng.uniform (x1, x2); -  WuPuttext (IMG,"Testing Text", org, rng.uniform (0,8), Rng.uniform (0, -)*0.05+0.1, Randomcolor (RNG), Rng.uniform (1,Ten), linetype); -  About Show (Win_name, IMG); $     } - } -  - voidDisplay_big_end (Mat img,Char*Win_name, rng rng) A { +     intW = -; theSize textSize = GetTextSize ("OpenCV Forever", Cv_font_hershey_complex,3,5,0); -Point org ((w-textsize.width)/2, (w + textsize.height)/2); $     intLinetype =8; the  the Mat Img2; the  the      for(inti =0; I < number; ++i) -     { inImg2 = img-Scalar::all (i); thePuttext (Img2,"OpenCV Forever", org, Cv_font_hershey_complex,3, Scalar (i, I,255),5, Linetype); the  About Show (Win_name, img2); the     } the } the  + intMain () - { the     intW = -;BayiRNG RNG (0xFFFFFFFF); the     Char*win_name ="Drawing"; theMat img =Mat::zeros (W, W, CV_8UC3); -  - drawing_random_lines (IMG, win_name, rng); the     //Drawing_random_rectangle (IMG, win_name, rng); the     //drawing_random_ellipse (IMG, win_name, rng); the     //drawing_random_polylines (IMG, win_name, rng); the     //Drawing_random_filledpolygon (IMG, win_name, rng); -     //drawing_random_circle (IMG, win_name, rng); the Display_random_text (IMG, win_name, rng); the display_big_end (IMG, win_name, rng); the 94 Waitkey (); the     return 0; the}

The documentation is explained and will not be mentioned.

The result is:

This explains the Puttext function:

Excerpted from CORE.HPP

1 enum2 {3Font_hershey_simplex =0,4Font_hershey_plain =1,5Font_hershey_duplex =2,6Font_hershey_complex =3,7Font_hershey_triplex =4,8Font_hershey_complex_small =5,9Font_hershey_script_simplex =6,TenFont_hershey_script_complex =7, OneFont_italic = - A }; -  - //! Renders text string in the image theCv_exports_wvoidPuttext (mat& img,Const string&text, point org, -                          intFontface,DoubleFontscale, Scalar color, -                          intthickness=1,intLinetype=8, -                          BOOLbottomleftorigin=false ); +  - //! Returns bounding box of the text string +Cv_exports_w Size GetTextSize (Const string& Text,intFontface, A                             DoubleFontscale,intthickness, atCv_outint* BaseLine);

int Fontface accepts the parameters of the font, so there is a definition of the above enum body.

int Fontscale accepts the scaling factor of a font;

The last Boolean parameter may be to determine whether to flip up or down;

Above.

OPENCV Official Document Learning record (5)