ตัวอย่างก่อนปรับ
ก่อนอื่นก็ไปสร้างหน้าอินเตอร์เฟสก่อนครับ โดยไปปรับแก้ไฟล์ XAML ให้ได้ประมาณนี้
<Window x:Class="KinectCam.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded"> <StackPanel Orientation="Horizontal"> <Image Name="kinectVideo" Width="440"/> <Slider Name="BlueSlider" Background="Blue" Maximum="255" Minimum="-255" Orientation="Vertical" ValueChanged="BlueSlider_ValueChanged"/> <Slider Name="GreenSlider" Background="Green" Maximum="255" Minimum="-255" Orientation="Vertical" ValueChanged="GreenSlider_ValueChanged"/> <Slider Name="RedSlider" Background="Red" Maximum="255" Minimum="-255" Orientation="Vertical" ValueChanged="RedSlider_ValueChanged"/> </StackPanel> </Window>
สังเกตว่าเรากำหนดให้ช่วงของ slider คือ -255 ถึง 255
หลักการค่อนข้างตรงไปตรงมาครับ เมื่อขยับ slider ก็ให้หาว่าค่าของ slider เป็นเท่าไหร่ สมมติเรียกว่าค่า offset
จากนั้นค่าของสีใหม่ = สีเดิม + offset
ถ้าค่านี้เกิน 255 ก็ให้เป็น 255 หรือถ้าต่ำกว่า 0 ก็ให้เป็น 0 ซึ่งเราเรียกวิธีการนี้ว่า Clamping หรือ Clipping ครับ
โค้ดทั้งหมดก็เพิ่มมานิดหน่อยจากของเดิมดังนี้ครับ
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using Microsoft.Kinect; namespace KinectCam { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { KinectSensor myKinect; private void Window_Loaded(object sender, RoutedEventArgs e) { //Check if there is any connecting Kinect if (KinectSensor.KinectSensors.Count == 0) { MessageBox.Show("No Kinect detected!", "Error"); //end this app Application.Current.Shutdown(); } //Try to initialize Kinect try { //Get the first Kinect connected to this computer myKinect = KinectSensor.KinectSensors[0]; //Enable the color video stream myKinect.ColorStream.Enable(); //Start the sensor myKinect.Start(); } catch { MessageBox.Show("Initialize Kinect failed!", "Error"); //end this app Application.Current.Shutdown(); } //Video event handler myKinect.ColorFrameReady += new EventHandler<ColorImageFrameReadyEventArgs>(myKinect_ColorFrameReady); } //color value private int blueOffset = 0; private int greenOffset = 0; private int redOffset = 0; //color data array byte[] colorData = null; WriteableBitmap imageBitmap = null; void myKinect_ColorFrameReady(object sender, ColorImageFrameReadyEventArgs e) { using (ColorImageFrame colorFrame = e.OpenColorImageFrame()) { //if get new video frame if (colorFrame == null) return; //create an array of pixel data if(colorData==null) colorData = new byte[colorFrame.PixelDataLength]; //extract pixel data from the frame to the array colorFrame.CopyPixelDataTo(colorData); //------------------------------------------------------ //modify the pixel data //0=Blue,1=Green,2=Red,3=Alpha int newValue = 0; for (int i = 0; i < colorData.Length; i = i + 4) { //blue newValue = colorData[i] + blueOffset; //clamping if (newValue > 255) newValue = 255; if (newValue < 0) newValue = 0; colorData[i] = (byte)(newValue); //green newValue = colorData[i + 1] + greenOffset; if (newValue > 255) newValue = 255; if (newValue < 0) newValue = 0; colorData[i + 1] = (byte)(newValue); //red newValue = colorData[i + 2] + redOffset; if (newValue > 255) newValue = 255; if (newValue < 0) newValue = 0; colorData[i + 2] = (byte)(newValue); } //------------------------------------------------------ //For the first video frame, no bitmap, create a writable bitmap of video size if (imageBitmap == null) { imageBitmap = new WriteableBitmap( colorFrame.Width, colorFrame.Height, 96, //dpiX 96, //dpiY PixelFormats.Bgr32, null //palette:none ); } //For other video frames, write video data to bitmap imageBitmap.WritePixels( new Int32Rect(0, 0, colorFrame.Width, colorFrame.Height), colorData, //video data colorFrame.Width * colorFrame.BytesPerPixel, //stride 0 //offset to the array ); //set bitmap to image view kinectVideo.Source = imageBitmap; } } private void BlueSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { //get slider value blueOffset = (int)BlueSlider.Value; } private void GreenSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { //get slider value greenOffset = (int)GreenSlider.Value; } private void RedSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { //get slider value redOffset = (int)RedSlider.Value; } } }
