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83 lines
1.8 KiB
C++
83 lines
1.8 KiB
C++
// Matlab style plot functions for OpenCV by Changbo (zoccob@gmail).
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#include "cv.h"
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#include "highgui.h"
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#include "cvplot.h"
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#define rowPtr(imagePtr, dataType, lineIndex) \
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(dataType *)(imagePtr->imageData + (lineIndex) * imagePtr->widthStep)
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int main(int argc, char* argv[])
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{
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// load an image
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char *imagefile = "test.jpg";
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IplImage *image = cvLoadImage(imagefile);
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if (image == NULL)
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{
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std::cout << "image error: " << imagefile << std::endl << std::flush;
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return -1;
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}
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// show an image
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cvShowImage("original", image);
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// plot and label:
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//
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// template<typename T>
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// void plot(const string figure_name, const T* p, int count, int step = 1,
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// int R = -1, int G = -1, int B = -1);
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//
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// figure_name: required. multiple calls of this function with same figure_name
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// plots multiple curves on a single graph.
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// p : required. pointer to data.
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// count : required. number of data.
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// step : optional. step between data of two points, default 1.
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// R, G,B : optional. assign a color to the curve.
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// if not assigned, the curve will be assigned a unique color automatically.
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//
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// void label(string lbl):
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//
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// label the most recently added curve with lbl.
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//
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// specify a line to plot
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int the_line = 100;
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int key = -1;
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while (the_line < image->height)
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{
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unsigned char *pb = rowPtr(image, unsigned char, the_line);
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int width = image->width;
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CvPlot::plot("RGB", pb+0, width, 3);
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CvPlot::label("B");
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CvPlot::plot("RGB", pb+1, width, 3, 255, 0, 0);
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CvPlot::label("G");
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CvPlot::plot("RGB", pb+2, width, 3, 0, 0, 255);
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CvPlot::label("R");
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key = cvWaitKey(0);
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if (key == 32)
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{
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// plot the next line
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the_line++;
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// clear previous plots
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CvPlot::clear("RGB");
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}
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else
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{
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break;
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}
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}
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cvReleaseImage(&image);
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return 0;
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}
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