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[C#/COMMON/GCLOUD] 구글 클라우드 비전 API의 객체 감지 기능 사용하기

■ 구글 클라우드 비전 API의 객체 감지 기능을 사용하는 방법을 보여준다. ▶ MainForm.cs


using System;
using System.Collections.Generic;
using System.Windows.Forms;

using Google.Cloud.Vision.V1;

namespace TestProject
{
    /// <summary>
    /// 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 이미지 주석자 클라이언트
        /// </summary>
        private ImageAnnotatorClient client;

        /// <summary>
        /// 파일 열기 대화 상자
        /// </summary>
        private OpenFileDialog openFileDialog;

        /// <summary>
        /// 로컬 객체 주석 리스트
        /// </summary>
        private IReadOnlyList<LocalizedObjectAnnotation> annotationList = null;

        /// <summary>
        /// 소스 이미지
        /// </summary>
        private System.Drawing.Image sourceImage = null;

        /// <summary>
        /// 기준 점수
        /// </summary>
        private float baseScore = 0.8f;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainForm()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            #region 이미지 주석자 클라이언트를 설정한다.

            this.client = ImageAnnotatorClient.Create();

            #endregion
            #region 파일 열기 대화 상자를 설정한다.

            this.openFileDialog = new OpenFileDialog();

            this.openFileDialog.Filter      = "이미지 파일|*.bmp;*.jpg;*.jpeg;*.jpe;*.gif;*.tif;*.tiff;*.png";
            this.openFileDialog.FilterIndex = 1;

            #endregion
            #region 픽처 박스를 설정한다.

            this.pictureBox.SizeMode = PictureBoxSizeMode.Normal;

            #endregion
            #region 이벤트를 설정한다.

            this.imageButton.Click  += imageButton_Click;
            this.updateButton.Click += updateButton_Click;
            this.pictureBox.Paint   += pictureBox_Paint;

            #endregion
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private
        //////////////////////////////////////////////////////////////////////////////// Event

        #region 이미지 버튼 클릭시 처리하기 - imageButton_Click(sender, e)

        /// <summary>
        /// 이미지 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private async void imageButton_Click(object sender, EventArgs e)
        {
            if(this.openFileDialog.ShowDialog() != DialogResult.OK)
            {
                return;
            }

            this.imageButton.Enabled      = false;
            this.baseScoreTextBox.Enabled = false;

            try
            {
                this.pictureBox.Image = null;

                this.sourceImage = null;

                string imageFilePath = this.openFileDialog.FileName;

                this.annotationList = await client.DetectLocalizedObjectsAsync(Image.FromFile(imageFilePath));

                this.sourceImage = System.Drawing.Image.FromFile(imageFilePath);

                SetBaseScore();

                this.pictureBox.Image = this.sourceImage;

                this.pictureBox.Refresh();
            }
            finally
            {
                this.imageButton.Enabled      = true;
                this.baseScoreTextBox.Enabled = true;
            }
        }

        #endregion
        #region 업데이트 버튼 클릭시 처리하기 - updateButton_Click(sender, e)

        /// <summary>
        /// 업데이트 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void updateButton_Click(object sender, EventArgs e)
        {
            SetBaseScore();

            this.pictureBox.Refresh();
        }

        #endregion
        #region 픽처 박스 페인트시 처리하기 - pictureBox_Paint(sender, e)

        /// <summary>
        /// 픽처 박스 페인트시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void pictureBox_Paint(object sender, PaintEventArgs e)
        {
            if(this.sourceImage == null)
            {
                return;
            }

            if(this.annotationList == null || this.annotationList.Count == 0)
            {
                return;
            }

            System.Drawing.Graphics graphics = e.Graphics;

            int imageWidth  = sourceImage.Width;
            int imageHeight = sourceImage.Height;

            int x1;
            int y1;

            int x2;
            int y2;

            NormalizedVertex vertex1;
            NormalizedVertex vertex2;

            foreach(LocalizedObjectAnnotation annotation in this.annotationList)
            {
                if(annotation.Score < this.baseScore)
                {
                    continue;
                }

                var vertextList = annotation.BoundingPoly.NormalizedVertices;

                vertex1 = vertextList[0];

                x1 = (int)(imageWidth  * vertex1.X) + 5;
                y1 = (int)(imageHeight * vertex1.Y) + 5;

                graphics.DrawString
                (
                    $"{annotation.Name} ({annotation.Score.ToString("#,##0.##")})",
                    Font,
                    System.Drawing.Brushes.Red,
                    x1,
                    y1
                );

                for(int i = 0; i < vertextList.Count; i++)
                {
                    if(i == vertextList.Count - 1)
                    {
                        vertex1 = vertextList[i];
                        vertex2 = vertextList[0];
                    }
                    else
                    {
                        vertex1 = vertextList[i    ];
                        vertex2 = vertextList[i + 1];
                    }

                    x1 = (int)(imageWidth  * vertex1.X);
                    y1 = (int)(imageHeight * vertex1.Y);

                    x2 = (int)(imageWidth  * vertex2.X);
                    y2 = (int)(imageHeight * vertex2.Y);

                    graphics.DrawLine(System.Drawing.Pens.Red, x1, y1, x2, y2);
                }
            }
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////// Function

        #region 기준 점수 설정하기 - SetBaseScore()

        /// <summary>
        /// 기준 점수 설정하기
        /// </summary>
        private void SetBaseScore()
        {
            try
            {
                this.baseScore = Convert.ToSingle(this.baseScoreTextBox.Text);

                if(this.baseScore < 0f)
                {
                    this.baseScore = 0f;

                    this.baseScoreTextBox.Text = "0.0";
                }
            }
            catch
            {
                this.baseScore = 0.8f;

                this.baseScoreTextBox.Text = "0.8";
            }
        }

        #endregion
    }
}

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using System;

using System.Collections.Generic;

using System.Windows.Forms;

using Google.Cloud.Vision.V1;

namespace TestProject

{

/// <summary>

/// 메인 폼

/// </summary>

public partial class MainForm : Form

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

////////////////////////////////////////////////////////////////////////////////////////// Private

#region Field

/// <summary>

/// 이미지 주석자 클라이언트

/// </summary>

private ImageAnnotatorClient client;

/// <summary>

/// 파일 열기 대화 상자

/// </summary>

private OpenFileDialog openFileDialog;

/// <summary>

/// 로컬 객체 주석 리스트

/// </summary>

private IReadOnlyList<LocalizedObjectAnnotation> annotationList = null;

/// <summary>

/// 소스 이미지

/// </summary>

private System.Drawing.Image sourceImage = null;

/// <summary>

/// 기준 점수

/// </summary>

private float baseScore = 0.8f;

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - MainForm()

/// <summary>

/// 생성자

/// </summary>

public MainForm()

{

InitializeComponent();

#region 이미지 주석자 클라이언트를 설정한다.

this.client = ImageAnnotatorClient.Create();

#endregion

#region 파일 열기 대화 상자를 설정한다.

this.openFileDialog = new OpenFileDialog();

this.openFileDialog.Filter = "이미지 파일|*.bmp;*.jpg;*.jpeg;*.jpe;*.gif;*.tif;*.tiff;*.png";

this.openFileDialog.FilterIndex = 1;

#endregion

#region 픽처 박스를 설정한다.

this.pictureBox.SizeMode = PictureBoxSizeMode.Normal;

#endregion

#region 이벤트를 설정한다.

this.imageButton.Click += imageButton_Click;

this.updateButton.Click += updateButton_Click;

this.pictureBox.Paint += pictureBox_Paint;

#endregion

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Private

//////////////////////////////////////////////////////////////////////////////// Event

#region 이미지 버튼 클릭시 처리하기 - imageButton_Click(sender, e)

/// <summary>

/// 이미지 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private async void imageButton_Click(object sender, EventArgs e)

{

if(this.openFileDialog.ShowDialog() != DialogResult.OK)

{

return;

}

this.imageButton.Enabled = false;

this.baseScoreTextBox.Enabled = false;

try

{

this.pictureBox.Image = null;

this.sourceImage = null;

string imageFilePath = this.openFileDialog.FileName;

this.annotationList = await client.DetectLocalizedObjectsAsync(Image.FromFile(imageFilePath));

this.sourceImage = System.Drawing.Image.FromFile(imageFilePath);

SetBaseScore();

this.pictureBox.Image = this.sourceImage;

this.pictureBox.Refresh();

}

finally

{

this.imageButton.Enabled = true;

this.baseScoreTextBox.Enabled = true;

}

#endregion

#region 업데이트 버튼 클릭시 처리하기 - updateButton_Click(sender, e)

/// <summary>

/// 업데이트 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void updateButton_Click(object sender, EventArgs e)

{

SetBaseScore();

this.pictureBox.Refresh();

}

#endregion

#region 픽처 박스 페인트시 처리하기 - pictureBox_Paint(sender, e)

/// <summary>

/// 픽처 박스 페인트시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void pictureBox_Paint(object sender, PaintEventArgs e)

{

if(this.sourceImage == null)

{

return;

}

if(this.annotationList == null || this.annotationList.Count == 0)

{

return;

}

System.Drawing.Graphics graphics = e.Graphics;

int imageWidth = sourceImage.Width;

int imageHeight = sourceImage.Height;

int x1;

int y1;

int x2;

int y2;

NormalizedVertex vertex1;

NormalizedVertex vertex2;

foreach(LocalizedObjectAnnotation annotation in this.annotationList)

{

if(annotation.Score < this.baseScore)

{

continue;

}

var vertextList = annotation.BoundingPoly.NormalizedVertices;

vertex1 = vertextList[0];

x1 = (int)(imageWidth * vertex1.X) + 5;

y1 = (int)(imageHeight * vertex1.Y) + 5;

graphics.DrawString

(

$"{annotation.Name} ({annotation.Score.ToString("#,##0.##")})",

Font,

System.Drawing.Brushes.Red,

x1,

);

for(int i = 0; i < vertextList.Count; i++)

{

if(i == vertextList.Count - 1)

{

vertex1 = vertextList[i];

vertex2 = vertextList[0];

}

else

{

vertex1 = vertextList[i ];

vertex2 = vertextList[i + 1];

}

x1 = (int)(imageWidth * vertex1.X);

y1 = (int)(imageHeight * vertex1.Y);

x2 = (int)(imageWidth * vertex2.X);

y2 = (int)(imageHeight * vertex2.Y);

graphics.DrawLine(System.Drawing.Pens.Red, x1, y1, x2, y2);

}

#endregion

//////////////////////////////////////////////////////////////////////////////// Function

#region 기준 점수 설정하기 - SetBaseScore()

/// <summary>

/// 기준 점수 설정하기

/// </summary>

private void SetBaseScore()

{

try

{

this.baseScore = Convert.ToSingle(this.baseScoreTextBox.Text);

if(this.baseScore < 0f)

{

this.baseScore = 0f;

this.baseScoreTextBox.Text = "0.0";

}

catch

{

this.baseScore = 0.8f;

this.baseScoreTextBox.Text = "0.8";

}

#endregion

}

※ 구글 클라우드 비전 API 사용 절차 1.

[C#/COMMON/GCLOUD] 구글 클라우드 비전 API의 OCR 기능 사용하기

■ 구글 클라우드 비전 API의 OCR 기능을 사용하는 방법을 보여준다. ▶ MainForm.cs


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using Google.Cloud.Vision.V1;

namespace TestProject
{
    /// <summary>
    /// 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 이미지 주석자 클라이언트
        /// </summary>
        private ImageAnnotatorClient client;

        /// <summary>
        /// 파일 열기 대화 상자
        /// </summary>
        private OpenFileDialog openFileDialog;

        /// <summary>
        /// 백그라운드 작업자
        /// </summary>
        private BackgroundWorker backgroundWorker;

        /// <summary>
        /// 문자열 빌더
        /// </summary>
        private StringBuilder stringBuilder = null;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainForm()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            #region 이미지 주석자 클라이언트를 설정한다.

            this.client = ImageAnnotatorClient.Create();

            #endregion
            #region 파일 열기 대화 상자를 설정한다.

            this.openFileDialog = new OpenFileDialog();

            this.openFileDialog.Filter      = "이미지 파일(*.png)|*.png";
            this.openFileDialog.FilterIndex = 1;
            this.openFileDialog.DefaultExt  = ".png";
            this.openFileDialog.Multiselect = true;

            #endregion
            #region 백그라운드 작업자를 설정한다.

            this.backgroundWorker = new BackgroundWorker();

            this.backgroundWorker.WorkerReportsProgress = true;

            #endregion
            #region 결과 텍스트 박스를 설정한다.

            this.resultTextBox.ReadOnly = true;

            #endregion
            #region 이벤트를 설정한다.

            this.imageButton.Click                   += imageButton_Click;
            this.backgroundWorker.DoWork             += backgroundWorker_DoWork;
            this.backgroundWorker.ProgressChanged    += backgroundWorker_ProgressChanged;
            this.backgroundWorker.RunWorkerCompleted += backgroundWorker_RunWorkerCompleted;

            #endregion
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region 이미지 버튼 클릭시 처리하기 - imageButton_Click(sender, e)

        /// <summary>
        /// 이미지 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void imageButton_Click(object sender, EventArgs e)
        {
            if(this.openFileDialog.ShowDialog() != DialogResult.OK)
            {
                return;
            }

            if(this.openFileDialog.FileNames == null || this.openFileDialog.FileNames.Length == 0)
            {
                return;
            }

            this.imageButton.Enabled = false;

            List<string> filePathList = this.openFileDialog.FileNames.OrderBy(x => x).ToList();

            this.backgroundWorker.RunWorkerAsync(filePathList);
        }

        #endregion

        #region 백그라운드 작업자 작업 처리하기 - backgroundWorker_DoWork(sender, e)

        /// <summary>
        /// 백그라운드 작업자 작업 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            List<string> filePathList = e.Argument as List<string>;

            if(this.stringBuilder != null)
            {
                this.stringBuilder.Clear();

                this.stringBuilder = null;
            }

            this.stringBuilder = new StringBuilder();

            for(int i = 0; i < filePathList.Count; i++)
            {
                string filePath = filePathList[i];

                this.backgroundWorker.ReportProgress(i, filePathList.Count);

                this.stringBuilder.AppendLine(filePath);
                this.stringBuilder.AppendLine("--------------------------------------------------");

                try
                {
                    Image image = Image.FromFile(filePath);

                    var response = client.DetectText(image);

                    string text = response.First()?.Description;

                    this.stringBuilder.AppendLine(text);

                    this.backgroundWorker.ReportProgress(i + 1, filePathList.Count);
                }
                catch
                {
                    continue;
                }
                finally
                {
                    this.stringBuilder.AppendLine("--------------------------------------------------");
                    this.stringBuilder.AppendLine();
                    this.stringBuilder.AppendLine();
                }
            }
        }

        #endregion
        #region 백그라운드 작업자 진행 변경시 처리하기 - backgroundWorker_ProgressChanged(sender, e)

        /// <summary>
        /// 백그라운드 작업자 진행 변경시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            int index = e.ProgressPercentage;
            int count = (int)e.UserState;

            this.imageButton.Text = $"{index}/{count}";

            this.imageButton.Update();
        }

        #endregion
        #region 백그라운드 작업자 실행 완료시 처리하기 - backgroundWorker_RunWorkerCompleted(sender, e)

        /// <summary>
        /// 백그라운드 작업자 실행 완료시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            this.resultTextBox.Text = this.stringBuilder?.ToString();

            this.imageButton.Text = "이미지";

            this.imageButton.Enabled = true;
        }

        #endregion
    }
}

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using Google.Cloud.Vision.V1;

namespace TestProject

{

/// <summary>

/// 메인 폼

/// </summary>

public partial class MainForm : Form

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

////////////////////////////////////////////////////////////////////////////////////////// Private

#region Field

/// <summary>

/// 이미지 주석자 클라이언트

/// </summary>

private ImageAnnotatorClient client;

/// <summary>

/// 파일 열기 대화 상자

/// </summary>

private OpenFileDialog openFileDialog;

/// <summary>

/// 백그라운드 작업자

/// </summary>

private BackgroundWorker backgroundWorker;

/// <summary>

/// 문자열 빌더

/// </summary>

private StringBuilder stringBuilder = null;

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - MainForm()

/// <summary>

/// 생성자

/// </summary>

public MainForm()

{

InitializeComponent();

#region 이미지 주석자 클라이언트를 설정한다.

this.client = ImageAnnotatorClient.Create();

#endregion

#region 파일 열기 대화 상자를 설정한다.

this.openFileDialog = new OpenFileDialog();

this.openFileDialog.Filter = "이미지 파일(*.png)|*.png";

this.openFileDialog.FilterIndex = 1;

this.openFileDialog.DefaultExt = ".png";

this.openFileDialog.Multiselect = true;

#endregion

#region 백그라운드 작업자를 설정한다.

this.backgroundWorker = new BackgroundWorker();

this.backgroundWorker.WorkerReportsProgress = true;

#endregion

#region 결과 텍스트 박스를 설정한다.

this.resultTextBox.ReadOnly = true;

#endregion

#region 이벤트를 설정한다.

this.imageButton.Click += imageButton_Click;

this.backgroundWorker.DoWork += backgroundWorker_DoWork;

this.backgroundWorker.ProgressChanged += backgroundWorker_ProgressChanged;

this.backgroundWorker.RunWorkerCompleted += backgroundWorker_RunWorkerCompleted;

#endregion

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Private

#region 이미지 버튼 클릭시 처리하기 - imageButton_Click(sender, e)

/// <summary>

/// 이미지 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void imageButton_Click(object sender, EventArgs e)

{

if(this.openFileDialog.ShowDialog() != DialogResult.OK)

{

return;

}

if(this.openFileDialog.FileNames == null || this.openFileDialog.FileNames.Length == 0)

{

return;

}

this.imageButton.Enabled = false;

List<string> filePathList = this.openFileDialog.FileNames.OrderBy(x => x).ToList();

this.backgroundWorker.RunWorkerAsync(filePathList);

}

#endregion

#region 백그라운드 작업자 작업 처리하기 - backgroundWorker_DoWork(sender, e)

/// <summary>

/// 백그라운드 작업자 작업 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)

{

List<string> filePathList = e.Argument as List<string>;

if(this.stringBuilder != null)

{

this.stringBuilder.Clear();

this.stringBuilder = null;

}

this.stringBuilder = new StringBuilder();

for(int i = 0; i < filePathList.Count; i++)

{

string filePath = filePathList[i];

this.backgroundWorker.ReportProgress(i, filePathList.Count);

this.stringBuilder.AppendLine(filePath);

this.stringBuilder.AppendLine("--------------------------------------------------");

try

{

Image image = Image.FromFile(filePath);

var response = client.DetectText(image);

string text = response.First()?.Description;

this.stringBuilder.AppendLine(text);

this.backgroundWorker.ReportProgress(i + 1, filePathList.Count);

}

catch

{

continue;

}

finally

{

this.stringBuilder.AppendLine("--------------------------------------------------");

this.stringBuilder.AppendLine();

}

#endregion

#region 백그라운드 작업자 진행 변경시 처리하기 - backgroundWorker_ProgressChanged(sender, e)

/// <summary>

/// 백그라운드 작업자 진행 변경시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)

{

int index = e.ProgressPercentage;

int count = (int)e.UserState;

this.imageButton.Text = $"{index}/{count}";

this.imageButton.Update();

}

#endregion

#region 백그라운드 작업자 실행 완료시 처리하기 - backgroundWorker_RunWorkerCompleted(sender, e)

/// <summary>

/// 백그라운드 작업자 실행 완료시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

{

this.resultTextBox.Text = this.stringBuilder?.ToString();

this.imageButton.Text = "이미지";

this.imageButton.Enabled = true;

}

#endregion

}

※ 구글 클라우드 비전 API 사용 절차 1. 구글