OPENCV Study Notes (iv) projection

OPENCV Study Notes (iv) projection

　　Optionally a picture for testing, the picture is as follows:

1#include <cv.h>2#include 3 using namespacestd;4 using namespaceCV;5 intMain ()6 {7Iplimage * src = cvloadimage ("Cat.png",0);//forced conversion read image as grayscale graph8Cvshowimage (the grayscaleImage", SRC);9Cvthreshold (SRC, SRC,0,255, Cv_thresh_otsu + cv_thresh_binary);//greater than 0 take 255, otherwise take 0Teniplimage* Paintx = cvcreateimage (cvgetsize (SRC), ipl_depth_8u,1);//image for vertical projection (single channel) Oneiplimage* Painty = cvcreateimage (cvgetsize (SRC), ipl_depth_8u,1);//image for horizontal projection (single channel) ACvzero (PAINTX);//Qing 0 -Cvzero (Painty);//Qing 0 -     int* v =New int[src->width];//used to record the number of pixel values greater than 0 in each column the     int* H =New int[src->height];//used to record the number of pixel values greater than 0 per row -memset (V,0, Src->width *4);//initializes the newly requested memory, initialized to 0,int of 4 bytes, so the block size is src->width * 4 -memset (H,0, Src->height *4);//initializes the newly requested memory, initialized to 0,int of 4 bytes, so the block size is src->height * 4 -  +     intx, y;//For Loop use -Cvscalar s, t;// +     /* A Cvscalar is an array that can be used to hold 4 double values at typically used to store pixel values (not necessarily grayscale values), can hold up to 4 channels of - How to assign a value: - a) storing pixels in a single-channel image: Cvscalar (255); - b) store three-channel image in pixels: cvscalar (255,255,255); - c) Use only the first channel, val[0]=val0, equivalent to Cvscalar (val0,0,0,0); -     */ in     //Traverse to count the number of pixels with a value greater than 0 per column -      for(x =0; x<src->width; X + +) to     { +          for(y =0; y<src->height; y++) -         { thes = cvget2d (src, y, x);//gets the pixel value of the specified coordinate *             if(s.val[0]>0) $v[x]++;//When the pixel value is greater than 0 o'clock, the pixel at the top of the column is more than 0 plus 1Panax Notoginseng         } -     } the  +     //create a vertically projected image A      for(x =0; x<src->width; X + +) the     { +          for(y =0; y<v[x]; y++) -         { $t.val[0] =255; $CVSET2D (Paintx, y, X, T);//assign a value of 255 to a coordinate with a pixel value greater than 0 -         } -     } the     //Traverse, count the number of pixels with a value greater than 0 per row -      for(y =0; y<src->height; y++)Wuyi     { the          for(x =0; x<src->width; X + +) -         { Wus = cvget2d (src, y, x);//gets the pixel value of the specified coordinate -             if(s.val[0]>0) Abouth[y]++;//when the pixel value is greater than 0 o'clock, the pixel of the current row is greater than 0 plus 1 . $         } -     } -     //Create a horizontal projected image -      for(y =0; y<src->height; y++) A     { +          for(x =0; x) the         { -t.val[0] =255; $ cvset2d (Painty, y, X, t); the         } the     } the  theCvnamedwindow ("Two value image",1); -Cvnamedwindow ("Vertical Integral projection",1); inCvnamedwindow ("Horizontal Integral projection",1); theCvshowimage ("Two value image", SRC); theCvshowimage ("Vertical Integral projection", paintx); AboutCvshowimage ("Horizontal Integral projection", painty); theCvwaitkey (0); the cvdestroyallwindows (); theCvreleaseimage (&src); +Cvreleaseimage (&paintx); -Cvreleaseimage (&painty); the     return 0;Bayi}

　　Operation Result:

　　1. Grayscale image

　　

　　2, two-value image

　　

　　3. Vertical Integral projection

　　

　　4. Horizontal Integral projection

　　

OPENCV Study Notes (iv) projection