pixel

This question is a duplicate of 1042830 , but MonoTouch-specific. Is there a way that's safer than allocating an IntPtr, drawing into it using CGBitmapContext and then reading bytes at the appropriate offset? I don't know if it's kosher to answer your own question, but: protected CGBitmapContext CreateARGBBitmapContext(CGImage inImage) { var pixelsWide = inImage.Width; var pixelsHigh = inImage.Height; var bitmapBytesPerRow = pixelsWide * 4; var bitmapByteCount = bitmapBytesPerRow * pixelsHigh; //Note implicit colorSpace.Dispose() using(var colorSpace = CGColorSpace.CreateDeviceRGB()) { /

I am try this PixelExtractor class in Swift 3, get a error; Cannot invoke initializer for type 'UnsafePointer' with an argument list of type '(UnsafeMutableRawPointer?)' class PixelExtractor: NSObject { let image: CGImage let context: CGContextRef? var width: Int { get { return CGImageGetWidth(image) } } var height: Int { get { return CGImageGetHeight(image) } } init(img: CGImage) { image = img context = PixelExtractor.createBitmapContext(img) } class func createBitmapContext(img: CGImage) -> CGContextRef { // Get image width, height let pixelsWide = CGImageGetWidth(img) let pixelsHigh =

Based on the responses to a previous question , I've created a category on UIImageView for extracting pixel data. This works fine in the simulator, but not when deployed to the device. I should say not always -- the odd thing is that it does fetch the correct pixel colour if point.x == point.y; otherwise, it gives me pixel data for a pixel on the other side of that line, as if mirrored. (So a tap on a pixel in the lower-right corner of the image gives me the pixel data for a corresponding pixel in the upper-left, but tapping on a pixel in the lower-left corner returns the correct pixel colour)

一、纯CSS实现数据上报 举个例子，要跟踪并统计某个按钮的点击事件： .button-1:active::after { content: url(./pixel.gif?action=click&id=button1); display: none; } .button-2:active::after { content: url(./pixel.gif?action=click&id=button2); display: none; } 此时，当我们点击按钮的时候，相关行为数据就会上报给服务器，这种上报，就算把JS禁掉也无法阻止。 当然，我们可以统计的不仅仅是单击行为，hover行为，focus行为都可以统计，当然，还有很多其他方面的。例如： 1. 不支持CSS3浏览器比例统计 web前端开发学习Q-q-u-n： 767273102 ，分享学习的方法和需要注意的小细节，不停更新最新的教程和学习方法（详细的前端项目实战教学视频） .any-element { background: url(./pixel.gif?css=2); background-image: url(./pixel.gif?css=3), none; } 例如，我的Chrome发出的图片请求地址就是： 类似的，我们可以检测支持其他一些CSS属性的比例，要比单纯看浏览器的占比要精准的多

%%OPAP I1 = imread('Lena.jpg'); [M N] = size(I1); I2 = I1; x = input('input bits'); for i = 1 : M for j = 1 : N S = round(rand(1 , x)) pixel = I2(i,j); count = 1; for k = 1 : x pixel2 = bitset(pixel , count , S(k)); count = count + 1; if (count > x) break end end sgm = pixel2 - pixel; if(sgm > 2^(x-1) && sgm < 2^x && pixel >= 2^x) finalP = pixel2 - 2^x; else if(sgm < -2^(x-1) && sgm > -2^x && pixel <= 255 - 2^x) finalP = pixel2 + 2^x; else finalP = pixel2; end end I2(i,j) = finalP; end end imshow(I2) 来源： https://blog.csdn.net/V1AN_zzz/article/details/100533433

After reading several articles on the web I´m a bit confused about when to use percent , em or px for div´s , input´s , font´s , buttons and so on... For the site I´m working on we wan´t to add a responsive design, and from what I understand from different articles than percent is the way to go for elements and div´s . But than I get confused because I´m thinking that I should be able to get a responsive design even if I use px för layout and than set different width, height in px depending on device/screen resolution...? And is there a best practice for when to use what? And not only for

I have a 2D image randomly and sparsely scattered with pixels. given a point on the image, I need to find the distance to the closest pixel that is not in the background color (black). What is the fastest way to do this? The only method I could come up with is building a kd-tree for the pixels. but I would really want to avoid such expensive preprocessing. also, it seems that a kd-tree gives me more than I need. I only need the distance to something and I don't care about what this something is. As Pyro says, search the perimeter of a square that you keep moving out one pixel at a time from

I am using setRGB() for changing the values of the pixel of an image. int rgb=new Color(0,0,0).getRGB(); image1.setRGB(i,j,rgb); //where i,j is the boundaries of the image Here,i am setting all the pixel values with white. But the change is not getting reflected in the image. Any One knows about the setRGB() how it works? Lo Juego White is in RGB 255,255,255 so: Color myWhite = new Color(255, 255, 255); // Color white int rgb = myWhite.getRGB(); try { BufferedImage img = null; try { img = ImageIO.read(new File("bubbles.bmp")); } catch (IOException e) { } for (int i = 0; i < 100; i++) { for