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~~~ |
