opencv 如何在图像输入字幕

          昨晚在床上看 opencv  看到了如何在图像输入字幕，其实前段时间我已经学过了，只是没认真琢磨，昨晚看了，尽早赶紧写了一下。哼~~~不错！

         代码如下：

   

	IplImage *img=cvCreateImage(cvSize(640,480),8,1);
	CvFont font;
	double hScale=1.0;
	double vScale=1.0;
	int lineWidth=1;
	cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX | CV_FONT_ITALIC, hScale, vScale, 0, lineWidth );
	cvPutText(img, "hellow world",cvPoint(100,100),&font, cvScalar(255,0,0) );
	cvShowImage("qq", img);
	cvWaitKey(0);
	return 0;

 

效果图：

 

参数：

cvInitFont(CvFont*font, int fontFace, double hscale, doublevscale, double shear=0, int thickness=1, intlineType=8 )¶

 

Parameters:

font – Pointer to the font structure initialized by the function fontFace – Font name identifier. Only a subset of Hershey fonts  http://sources.isc.org/utils/misc/hershey-font.txt  are supported now: CV_FONT_HERSHEY_SIMPLEX normal size sans-serif font CV_FONT_HERSHEY_PLAIN small size sans-serif font CV_FONT_HERSHEY_DUPLEX normal size sans-serif font (more complex than   CV_FONT_HERSHEY_SIMPLEX ) CV_FONT_HERSHEY_COMPLEX normal size serif font CV_FONT_HERSHEY_TRIPLEX normal size serif font (more complex than CV_FONT_HERSHEY_COMPLEX ) CV_FONT_HERSHEY_COMPLEX_SMALL smaller version of  CV_FONT_HERSHEY_COMPLEX CV_FONT_HERSHEY_SCRIPT_SIMPLEX hand-writing style font CV_FONT_HERSHEY_SCRIPT_COMPLEX more complex variant of  CV_FONT_HERSHEY_SCRIPT_SIMPLEX The parameter can be composited from one of the values above and an optional  CV_FONT_ITALIC  flag, which indicates italic or oblique font. hscale – Horizontal scale.  If equal to  1.0f , the characters have the original width depending on the font type. If equal to 0.5f , the characters are of half the original width. vscale – Vertical scale. If equal to  1.0f , the characters have the original height depending on the font type. If equal to0.5f , the characters are of half the original height. shear – Approximate tangent of the character slope relative to the vertical line.  A zero value means a non-italic font, 1.0f  means about a 45 degree slope, etc. thickness – Thickness of the text strokes lineType – Type of the strokes, see  line()  description     cvPutText(CvArr*img, const char* text, CvPoint org, const CvFont*font, CvScalar color)¶   Parameters: img – Image. text – Text string to be drawn. org – Bottom-left corner of the text string in the image. font – CvFont structure initialized usingInitFont(). fontFace – Font type. One of  FONT_HERSHEY_SIMPLEX, FONT_HERSHEY_PLAIN, FONT_HERSHEY_DUPLEX,  FONT_HERSHEY_COMPLEX,  FONT_HERSHEY_TRIPLEX, FONT_HERSHEY_COMPLEX_SMALL,  FONT_HERSHEY_SCRIPT_SIMPLEX, or  FONT_HERSHEY_SCRIPT_COMPLEX, where each of the font ID’s can be combined with FONT_HERSHEY_ITALIC  to get the slanted letters. fontScale – Font scale factor that is multiplied by the font-specific base size. color – Text color. thickness – Thickness of the lines used to draw a text. lineType – Line type. See the  line  for details. bottomLeftOrigin – When true, the image data origin is at the bottom-left corner. Otherwise, it is at the top-left corner.       好了，到此啦。详见opencv manual~~~