Salt and pepper noise

Salt and pepper noise is a form of noise sometimes seen on images. It presents itself as randomly occurring white and black pixels. It is useful when you want to create a demo application and you wish the viewer to purchase it to be able to enjoy it at it's maximum quality. In this tutorial we will see how to add salt and pepper noise to a video using Ozeki Camera SDK.

Important: you should study this article in order to find out how to setup your Windows Forms Application correctly.

Properties

NoiseAmount: We can use this to set the value of the level which is between 0 and 100. If you choose a low amount, you will see significantly fewer "noise" on the image. If you choose a bigger value, the amount of white and black pixels will become higher.

before salt and pepper noise — Figure 1 - Original image

after salt and pepper noise — Figure 2 - Modified image with salt and pepper noise effect

Windows Form

Windows forms version

MainForm.cs

using System;
using System.Windows.Forms;
using Ozeki.Camera;
using Ozeki.Media;

namespace ImageManipulation_WF
{
    public partial class MainForm : Form
    {
        private ICamera _camera;
        private DrawingImageProvider _imageProvider;
        private MediaConnector _connector;
  
        private ImageManipulation _manipulation;
        private OzSaltAndPepperNoise _filter;

        public MainForm()
        {
            InitializeComponent();

            _connector = new MediaConnector();
            _imageProvider = new DrawingImageProvider();
            // Create video viewer UI control

            // Bind the camera image to the UI control
            videoViewer.SetImageProvider(_imageProvider);

            _manipulation = new ImageManipulation();
            _manipulation.Start();

            _filter = new OzSaltAndPepperNoise();
        }

        private void btn_Connect_Click(object sender, EventArgs e)
        {
            _camera = new WebCamera();

            if (_camera == null) return;

            _connector.Connect(_camera.VideoChannel, _manipulation);
            _connector.Connect(_manipulation, _imageProvider);

            _camera.Start();
            videoViewer.Start();
        }

        private void btn_Add_Click(object sender, EventArgs e)
        {
            _manipulation.Add(_filter);
        }

        private void btn_Remove_Click(object sender, EventArgs e)
        {
            _manipulation.Remove(_filter);
        }

        private void factorTrack_Scroll(object sender, EventArgs e)
        {
            var trackBar = sender as TrackBar;
            if (trackBar != null)
            {
                var value = trackBar.Value;
                _filter.NoiseAmount = value;
                lb_Level.Text = @"NoiseAmount: " + value;
                //   lb_Adjust.Text = @"Value: " + value;
            }  
        }
    }
}

Code 1 Salt and pepper noise in C#

GUI

Windows forms version

MainForm.cs

namespace ImageManipulation_WF
{
    partial class MainForm
    {
        /// 
        /// Required designer variable.
        /// 
        private System.ComponentModel.IContainer components = null;

        /// 
        /// Clean up any resources being used.
        /// 
        /// true if managed resources should be disposed; otherwise, false.
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// 
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// 
        private void InitializeComponent()
        {
            this.videoViewer = new Ozeki.Media.VideoViewerWF();
            this.btn_Connect = new System.Windows.Forms.Button();
            this.btn_Remove = new System.Windows.Forms.Button();
            this.btn_Add = new System.Windows.Forms.Button();
            this.lb_Level = new System.Windows.Forms.Label();
            this.trackBar = new System.Windows.Forms.TrackBar();
            ((System.ComponentModel.ISupportInitialize)(this.trackBar)).BeginInit();
            this.SuspendLayout();
            // 
            // videoViewer
            // 
            this.videoViewer.BackColor = System.Drawing.Color.Black;
            this.videoViewer.FlipMode = Ozeki.Media.FlipMode.None;
            this.videoViewer.FrameStretch = Ozeki.Media.FrameStretch.Uniform;
            this.videoViewer.FullScreenEnabled = true;
            this.videoViewer.Location = new System.Drawing.Point(12, 57);
            this.videoViewer.Name = "videoViewer";
            this.videoViewer.RotateAngle = 0;
            this.videoViewer.Size = new System.Drawing.Size(471, 334);
            this.videoViewer.TabIndex = 0;
            this.videoViewer.Text = "videoViewerWF1";
            // 
            // btn_Connect
            // 
            this.btn_Connect.Location = new System.Drawing.Point(12, 12);
            this.btn_Connect.Name = "btn_Connect";
            this.btn_Connect.Size = new System.Drawing.Size(152, 26);
            this.btn_Connect.TabIndex = 14;
            this.btn_Connect.Text = "Connect to WebCamera";
            this.btn_Connect.UseVisualStyleBackColor = true;
            this.btn_Connect.Click += new System.EventHandler(this.btn_Connect_Click);
            // 
            // btn_Remove
            // 
            this.btn_Remove.Location = new System.Drawing.Point(104, 475);
            this.btn_Remove.Name = "btn_Remove";
            this.btn_Remove.Size = new System.Drawing.Size(75, 23);
            this.btn_Remove.TabIndex = 1;
            this.btn_Remove.Text = "Remove";
            this.btn_Remove.UseVisualStyleBackColor = true;
            this.btn_Remove.Click += new System.EventHandler(this.btn_Remove_Click);
            // 
            // btn_Add
            // 
            this.btn_Add.Location = new System.Drawing.Point(23, 475);
            this.btn_Add.Name = "btn_Add";
            this.btn_Add.Size = new System.Drawing.Size(75, 23);
            this.btn_Add.TabIndex = 0;
            this.btn_Add.Text = "Add";
            this.btn_Add.UseVisualStyleBackColor = true;
            this.btn_Add.Click += new System.EventHandler(this.btn_Add_Click);
            // 
            // lb_Level
            // 
            this.lb_Level.AutoSize = true;
            this.lb_Level.Location = new System.Drawing.Point(20, 423);
            this.lb_Level.Name = "lb_Level";
            this.lb_Level.Size = new System.Drawing.Size(76, 13);
            this.lb_Level.TabIndex = 15;
            this.lb_Level.Text = "Noise Amount:";
            // 
            // trackBar
            // 
            this.trackBar.Location = new System.Drawing.Point(141, 423);
            this.trackBar.Maximum = 100;
            this.trackBar.Minimum = 1;
            this.trackBar.Name = "trackBar";
            this.trackBar.Size = new System.Drawing.Size(342, 45);
            this.trackBar.TabIndex = 16;
            this.trackBar.Value = 1;
            this.trackBar.Scroll += new System.EventHandler(this.factorTrack_Scroll);
            // 
            // MainForm
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(498, 520);
            this.Controls.Add(this.trackBar);
            this.Controls.Add(this.lb_Level);
            this.Controls.Add(this.btn_Remove);
            this.Controls.Add(this.btn_Add);
            this.Controls.Add(this.btn_Connect);
            this.Controls.Add(this.videoViewer);
            this.Name = "MainForm";
            this.Text = "Salt and pepper noise";
            ((System.ComponentModel.ISupportInitialize)(this.trackBar)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private Ozeki.Media.VideoViewerWF videoViewer;
        private System.Windows.Forms.Button btn_Connect;
        private System.Windows.Forms.Button btn_Remove;
        private System.Windows.Forms.Button btn_Add;
        private System.Windows.Forms.Label lb_Level;
        private System.Windows.Forms.TrackBar trackBar;
    }
}

Code 2 Salt and pepper noise GUI in C#

Conclusion

With the help of this lecture you can successfully implement salt and pepper noise with your C# camera application using the Ozeki Camera SDK.

FAQ

Below you can find the answers for the most frequently asked questions related to this topic:

What kind of developer environment is needed?
- Microsoft Visual Studio 2010
- Microsoft .Net Framework 4.0
- Internet connection
How can I get the URL of the camera?

You can get the URL from the producer of the camera.
I have not managed to build the solution. How to solve it?
- Please set the Target framework property of the project to .NET 4.0.
- You should add the OzekiSDK.dll to the references of the solution.
- Please import the missing classes.