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C# OpenCvSharp DNN 实现百度网盘AI大赛-表格检测第2名方案第三部分-表格方向识别

360影视 2024-12-23 09:11 4

摘要：max_image = Mat.Zeros(new OpenCvSharp.Size(max_image_length, max_image_length), MatType.CV_8UC3);

百度网盘AI大赛-表格检测的第2名方案。

该算法包含表格边界框检测、表格分割和表格方向识别三个部分，首先，ppyoloe-plus-x 对边界框进行预测，并对置信度较高的表格边界框（box）进行裁剪。裁剪后的单个表格实例会送入到DBNet中进行语义分割，分割结果通过opencv轮廓处理获得表格关键点(point)。之后，我们根据DBNet计算的关键点在裁剪后的单个表格实例上绘制表格边界。最后，PP-LCNet结合表格边界先验和表格实例图像，对表格的方向进行预测，并根据之前定义的几何轮廓点与语义轮廓点的对应关系，将几何轮廓点映射为语义轮廓点。

本文使用C# OpenCvSharp DNN 实现百度网盘AI大赛-表格检测第2名方案第三部分-表格方向识别。

C# OpenCvSharp DNN 实现百度网盘AI大赛-表格检测第2名方案第一部分-表格边界框检测

C# OnnxRuntime 实现百度网盘AI大赛-表格检测第2名方案第二部分-表格分割

Model Properties

Inputs

name：input
tensor：Float[-1, 3, 624, 624]

Outputs

name：linear_1.tmp_1
tensor：Float[-1, 4]

using OpenCvSharp;
using OpenCvSharp.Dnn;
using System;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;

namespace OpenCvSharp_DNN_Demo
{
public partial class frmMain : Form
{
publicfrmMain
{
InitializeComponent;
}

string fileFilter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png";
string image_path = "";
string startupPath;
string classer_path;

DateTime dt1 = DateTime.Now;
DateTime dt2 = DateTime.Now;
string model_path;
Mat image;

Mat result_mat;
Mat result_image;
Mat result_mat_to_float;

Net opencv_net;
Mat BN_image;

float result_array;

int max_image_length;
Mat max_image;
Rect roi;

private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog;
ofd.Filter = fileFilter;
if(ofd.ShowDialog != DialogResult.OK)return;

pictureBox1.Image = ;
pictureBox2.Image = ;
textBox1.Text = "";

image_path = ofd.FileName;
pictureBox1.Image = new Bitmap(image_path);
image = new Mat(image_path);
}

private void Form1_Load(object sender, EventArgs e)
{
string model_path = "model/paddle_cls.onnx";
opencv_net = CvDnn.ReadNetFromOnnx(model_path);

image_path = "test_img/1.jpg";

}

private unsafe void button2_Click(object sender, EventArgs e)
{

if(image_path == "")
{
return;
}

if(image_path == "")
{
return;
}
textBox1.Text = "检测中，请稍等……";

Application.DoEvents;

Mat image = new Mat(image_path);

//缩放图片
max_image_length = image.Cols > image.Rows ? image.Cols : image.Rows;
max_image = Mat.Zeros(new OpenCvSharp.Size(max_image_length, max_image_length), MatType.CV_8UC3);
roi = new Rect(0, 0, image.Cols, image.Rows);
image.CopyTo(new Mat(max_image, roi));

//数据归一化处理
BN_image = CvDnn.BlobFromImage(max_image, 1 / 255.0, new OpenCvSharp.Size(624, 624), new Scalar(0, 0, 0),truefalse);

//配置图片输入数据
opencv_net.SetInput(BN_image);

dt1 = DateTime.Now;
//模型推理，读取推理结果
result_mat = opencv_net.Forward;
dt2 = DateTime.Now;

//将推理结果转为float数据类型
result_mat_to_float = new Mat(1, 4, MatType.CV_32F, result_mat.Data);

//将数据读取到数组中
result_mat_to_float.GetArrayfloat>(out result_array);

floatmax = result_array.Max; //
int maxIndex = Array.IndexOf(result_array, max); // 获取最大值的索引位置
//语义左上角位于几何左上角,定义为0；
//语义左上角位于几何右上角,定义为1；
//语义左上角位于几何右下角,定义了2；
//语义左上角位于几何左下角,定义为3。

textBox1.Text = "推理耗时:" + (dt2 - dt1).TotalMilliseconds + "ms\r\n";
string msg = "";
if(maxIndex == 0) {
msg = "语义左上角位于几何左上角";
}
elseif(maxIndex == 1)
{
msg = "语义左上角位于几何右上角";
}
elseif(maxIndex == 2)
{
msg = "语义左上角位于几何右下角";
}
elseif(maxIndex == 3)
{
msg = "语义左上角位于几何左下角";
}
textBox1.Text += "\r\n" + msg;
}

private void pictureBox2_DoubleClick(object sender, EventArgs e)
{
Common.ShowNormalImg(pictureBox2.Image);
}

private void pictureBox1_DoubleClick(object sender, EventArgs e)
{
Common.ShowNormalImg(pictureBox1.Image);
}
}
}

https://aistudio.baidu.com/projectdetail/5398861?searchKeyword=表格检测大赛&searchTab=ALL

来源：opendotnet

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