写垫（OpenCV的）数据类型CSV文件的Java或Android [英] Write Mat(OpenCV) data type to csv file in Java or Android

问题描述

我喜欢从OpenCV的一个CSV文件普林垫类型的数据。我可以从转换
垫字节数组，然后我写的文本文件，我从来没有得到完整的图像。总是得到图像的一部分。可能是什么问题？

  printtoTextFile（马太福音D，文件fil​​e_g）{
   尺寸尺寸= d.size（）;
   字节[] A =新的字节[（INT）（为d.width *为d.height）];
   d.get（0，0，一）; //我得到字节数组，这里的整体形象
   FileOutputStream中fos_g = NULL;
    OutputStreamWriter流量= NULL;
    BufferedWriter将fwriter = NULL;
    尝试{
        fos_g =新的FileOutputStream（file_g）;
        OW =新OutputStreamWriter（fos_g）;
        fwriter =新的BufferedWriter（流）;
    }赶上（FileNotFoundException异常五）{
        // TODO自动生成catch块
        e.printStackTrace（）;
    }
   为（X = 0; X＆下; size.height; X ++）{
            对于（Y = 0; Y＆LT; size.width; Y ++）{
                fwriter.write（将String.valueOf（一[（INT）（X * size.width + Y）]））;
                ow.flush（）;
                fwriter.write（，）;
                ow.flush（）;
            }
            fwriter.write（\\ n）;
            ow.flush（）;
            //fos_g.flush（）;
        }
        fos_g.flush（）;
        尝试{
            fos_g.close（）;
        }赶上（IOException异常五）{
            // TODO自动生成catch块
            e.printStackTrace（）;
        }    }
}
 

解决方案

OpenCV的矩阵按行，不是逐列存储行，因此你应该交换 X 和是中的数组访问：

  fwriter.write（将String.valueOf（一[（INT）（Y * size.width + X）]））;
 

因此​​，为了提高效率，你也应该换你的 X 和是循环。

I like to pring Mat type data from OpenCV to a csv file. I can convert from Mat to byte array, then I write to text file and I never get full image. Always get a portion of the image. What could be wrong?

printtoTextFile(Mat d, File file_g){
   Size size = d.size();
   byte[] a = new byte[(int) (d.width * d.height)];
   d.get(0, 0, a);//I get byte array here for the whole image
   FileOutputStream fos_g = null;
    OutputStreamWriter ow = null;
    BufferedWriter fwriter = null;
    try {
        fos_g = new FileOutputStream(file_g);
        ow = new OutputStreamWriter(fos_g);
        fwriter = new BufferedWriter(ow);
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
   for (x = 0; x < size.height; x++){
            for (y = 0; y < size.width; y++){
                fwriter.write(String.valueOf(a[(int) (x * size.width + y)]));
                ow.flush();
                fwriter.write(","); 
                ow.flush();
            }
            fwriter.write("\n");
            ow.flush();
            //fos_g.flush();
        }
        fos_g.flush();
        try {
            fos_g.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}

解决方案

OpenCV matrices are stored row by row, not column by column, hence you should swap the x and y in the array access:

fwriter.write(String.valueOf(a[(int) (y * size.width + x)]));

As a consequence, for efficiency, you should also swap your x and y loops.

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