pixel

I'm attempting to derive an intensity value for a particular pixel in a monochrome "grayscale" image. I have some pseudocode, but thus far I've been unable to implement something that really works. /** * Retrieve the intensity value at location ('row', 'column') of the image 'img' and return it * Note: * - the 2D image is stored as an 8bit, 1D, row-major array of type byte * - the data type byte is signed in Java * - Slide 27 of chapter 2 introduces the representation of an image * @param img in row major format * @param row to evaluate * @param column to evaluate * @param width of img *

For example, a 3 pixel by 3 pixel jpeg image of a checkerboard should be something like [[#000000, #FFFFFF, #000000], [#FFFFFF, #000000, #FFFFFF], [#000000, #FFFFFF, #000000]] I feel like I may need to download PIL, but I cannot tell what the module does from their website. I also need to be able to generate images from these types of arrays. Thank you! Use the Image.getdata method. The method returns a generator that you can iterate over: from PIL import Image img = Image.open("a.png") data = img.getdata() for (r, g, b, a) in data: # do something with the pixel values To go the other way you

Problem : I want to make prototype for cleaning windows (I mean cleaning dirty windows) in unity. I was searching about this subject and finding that I can change pixel by Texture2D.SetPixel() . I try to do it by this method, First I enabled read/write of texture and try this method but nothing happened on my sprite. So I want to ask it if it's possible to change alpha of the sprite that is clicked by mouse or touched to show the below sprite of original one !? My Code : private RaycastHit2D hitInfo; private SpriteRenderer spriteRendererComponent; private Color zeroAlpha; // Use this for

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I would like to access pixels in RGB with OpenCV 2.3. I'm trying like this but it's like every pixels are equal frame after frame because I got no output. Images are from my webcam and I can see them. Btw RED = 0; THX Mat frame; Mat oldFrame; VideoCapture cap(0); cap >> oldFrame; sumFramePix = oldFrame.cols * oldFrame.rows; nbChannels = oldFrame.channels(); cout << "NbcHANNELs : " << nbChannels << endl; imshow("Video 1", oldFrame); while(1) { cap >> frame; imshow("Video 1", frame); for(int i=0; i<frame.rows; i++) { for(int j=0; j<frame.cols; j++) { if (frame.ptr<uchar>(i)[nbChannels*j+RED] <

// x,y 分别为x轴，y轴坐标 返回System.Drawing.Color 可以直接显示 public System.Drawing.Color GetPixelColor(int x, int y) { IntPtr hdc = GetDC(IntPtr.Zero); uint pixel = GetPixel(hdc, x, y); ReleaseDC(IntPtr.Zero, hdc); Color color = Color.FromArgb((int)(pixel & 0x000000FF), (int)(pixel & 0x0000FF00) >> 8, (int)(pixel & 0x00FF0000) >> 16); return color; } //定义一个定时器 获取当前坐标上的像素点颜色 private void timer_Tick(object sender, EventArgs e) { textBox1.Text = GetPixelColor(Cursor.Position.X, Cursor.Position.Y).R.ToString() + " " + GetPixelColor(Cursor.Position.X, Cursor.Position.Y).G.ToString() + " " + GetPixelColor(Cursor

Using some criterion, there are some pixels in the image which I'm not interested in. So, I would like to neglect them. I just want to ask if the approach I have followed is acceptable. I have assigned such pixels a negative value. Would that be acceptable? And, what does it mean when a pixel has a negative value? Will it have some representation on the image? If your data type allows it, like signed integer (CV_32S) or floating point (CV_32F or CV_64F), it makes perfect sense to use negative values and it is a very common way to specify ignored pixels. In this case there is no special meaning

I would like to get the color of a particular pixel in Python using its X Y coordinates, is this possible? This is in Windows, if it makes a difference. See http://rosettacode.org/wiki/Color_of_a_screen_pixel under the heading for python they give: def get_pixel_colour(i_x, i_y): import win32gui i_desktop_window_id = win32gui.GetDesktopWindow() i_desktop_window_dc = win32gui.GetWindowDC(i_desktop_window_id) long_colour = win32gui.GetPixel(i_desktop_window_dc, i_x, i_y) i_colour = int(long_colour) return (i_colour & 0xff), ((i_colour >> 8) & 0xff), ((i_colour >> 16) & 0xff) print get_pixel

I want to make a lazy loading of image pixels to the 3 dimensional array of integers. For example in simple way it looks like this: for i=0 to Width for j=0 to Height let point=image.GetPixel(i,j) pixels.[0,i,j] <- point.R pixels.[1,i,j] <- point.G pixels.[2,i,j] <- point.B How it can be made in lazy way? What would be slow is the call to GetPixel . If you want to call it only as needed, you could use something like this: open System.Drawing let lazyPixels (image:Bitmap) = let Width = image.Width let Height = image.Height let pixels : Lazy<byte>[,,] = Array3D.zeroCreate 3 Width Height for i =