OpenCV入门：(七：OpenCV取随机数以及显示文字)

1.随机颜色

OpenCV中自带了取随机数的方法，使用步骤：
RNG rng( 0xFFFFFFFF );

随机数 = rng.uniform( 下限,上限 );

2.显示文字

void putText(Mat& img, const string& text, Point org, int fontFace, double fontScale, Scalar color, int thickness=1, int lineType=8, bool bottomLeftOrigin=false )

img – Image.

text – Text string to be drawn.

org – Bottom-left corner of the text string in the image.

font – CvFont structure initialized using InitFont().

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_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.

使用方法：

putText( image, "Testing text rendering", org, rng.uniform(0,8),

rng.uniform(0,100)*0.05+0.1, randomColor(rng), rng.uniform(1, 10), lineType);

巴特西

OpenCV入门：(七：OpenCV取随机数以及显示文字)

1.随机颜色

2.显示文字

3.结束

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