opencv4 java投影

Posted 2022-06-24 jnhs

 比较适合与验证码的处理，毕竟八邻域降噪不能消除比较大的噪点，为了尽量减少噪点对后续识别精度产生负面影响，

最好还是把文字拆分为单个的字符图像，然后再去识别，精度会更高一些

垂直投影和水平投影结合起来分割，可以做到截取最小的分辨率，减少干扰

 

          垂直投影

  private org.opencv.core.Mat projectionVerticality(org.opencv.core.Mat mat) 
        org.opencv.core.Mat projectionMat = mat.clone();//曲线救国，获取同样一个mat       
        projectionMat.setTo(new org.opencv.core.Scalar(255));//然后再把颜色换成白色
        Double[] dotList = new Double[mat.cols()];//创建一个list用于存储每一列的黑点数量      
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        System.out.println(mat.dump());
        int col = mat.cols();
        int row = mat.rows();
        for (int x = 0; x < col; x++) 
            dotList[x] = 0.0;
            for (int y = 0; y < row; y++) 
                double binData = mat.get(y, x)[0];
                if (binData == 0) //黑色

                    dotList[x]++;
                
            
        
        //然后生成投影图
        for (int x = 0; x < mat.cols(); x++) 
            for (int y = 0; y < mat.rows(); y++) 
                if (x == 147) 
                    System.out.println("下一行将会出现错误");
                
                if (y < dotList[x]) 
                    projectionMat.put(y, x, 0);
                    System.out.println(x + "列" + y + "行");
                

            

        

        return projectionMat;
    

 

 

      水平投影

 private org.opencv.core.Mat projectionHorizontal(org.opencv.core.Mat mat) 
        org.opencv.core.Mat projectionMat = mat.clone();//曲线救国，获取同样一个mat       
        projectionMat.setTo(new org.opencv.core.Scalar(255));//然后再把颜色换成白色
        Double[] dotList = new Double[mat.rows()];//创建一个list用于存储每一列的黑点数量      
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        System.out.println(mat.dump());
        int col = mat.cols();
        int row = mat.rows();
        for (int y = 0; y < row; y++) 
            dotList[y] = 0.0;
            for (int x = 0; x < col; x++) 
                double binData = mat.get(y, x)[0];
                if (binData == 0) //黑色                   
                    dotList[y]++;
                
            
        
        //然后生成投影图
        for (int y = 0; y < mat.rows(); y++) 
            for (int x = 0; x < mat.cols(); x++) 
                try 
                    if (x < dotList[y]) 
                        projectionMat.put(y, x, 0);
                    
                 catch (Exception e) 
                    System.out.println("正在处理第：" + y + "行，第" + x + "列");
                
            
        
        return projectionMat;