# OpenCV 显示文字相关函数

文字结构

• 函数： CvFont()
• 定义：

/** Font structure */
typedef struct CvFont
{
const char* nameFont;   //Qt:nameFont
CvScalar color;       //Qt:ColorFont -> cvScalar(blue_component, green_component, red_component[, alpha_component])
  int         font_face;    //Qt: bool italic         /** =CV_FONT_* */
  const int*  ascii;      //!< font data and metrics
  const int*  greek;
  const int*  cyrillic;
  float       hscale, vscale;
  float       shear;      //!< slope coefficient: 0 - normal, >0 - italic
  int         thickness;    //!< Qt: weight               /** letters thickness */
  float       dx;       //!< horizontal interval between letters
  int         line_type;    //!< Qt: PointSize
}
CvFont;

文字输出

• • 函数：cvInitFont()
  • 定义：

  CVAPI(void)  cvInitFont( CvFont* font, int font_face,
                        double hscale, double vscale,
                        double shear CV_DEFAULT(0),
                        int thickness CV_DEFAULT(1),
                        int line_type CV_DEFAULT(8));
  
  

• • 函数：getTextSize()
  • 定义：

  CV_EXPORTS_W Size getTextSize(const String& text, int fontFace,
                           double fontScale, int thickness,
                           CV_OUT int* baseLine);
  

• • 函数：putText()
  • 定义

  CV_EXPORTS_W void putText( InputOutputArray img, const String& text, Point org,
                         int fontFace, double fontScale, Scalar color,
                         int thickness = 1, int lineType = LINE_8,
                         bool bottomLeftOrigin = false );
  

  • 描述

  /** @brief Draws a text string.
  
  The function cv::putText renders the specified text string in the image. Symbols that cannot be rendered
  using the specified font are replaced by question marks. See #getTextSize for a text rendering code
  example.
  
  @param img Image.
  @param text Text string to be drawn.
  @param org Bottom-left corner of the text string in the image.
  @param fontFace Font type, see #HersheyFonts.
  @param fontScale Font scale factor that is multiplied by the font-specific base size.
  @param color Text color.
  @param thickness Thickness of the lines used to draw a text.
  @param lineType Line type. See #LineTypes
  @param bottomLeftOrigin When true, the image data origin is at the bottom-left corner. Otherwise,
  it is at the top-left corner.
  */
  

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