pixels

I have this image in OpenCV imgColorPanel = imread("newGUI.png", CV_LOAD_IMAGE_COLOR); : When I load it in with grey scale imgColorPanel = imread("newGUI.png", CV_LOAD_IMAGE_GRAYSCALE); it looks like this: However I want to remove the white background or make it transparent (only it's white pixels), to be looking like this: How to do it in C++ OpenCV ? You can convert the input image to BGRA channel (color image with alpha channel) and then modify each pixel that is white to set the alpha value to zero. See this code: // load as color image BGR cv::Mat input = cv::imread("C:/StackOverflow

I am trying to create a guassian filter without using ConvolveOp. I am having a lot of problems trying to get this to work, i have gotten a grey scale filter to work, but for this one i am having problems finding the location of a pixels 8 neighbors, so i can apply the filter. here is what i have so far. Is this the right way to approach getting each of the pixels? public class Gaussian implements Filter { public void filter(PixelImage pi) { Pixel[][] data = pi.getData(); Pixel[][] original = data; int kernel_rows = 3; int kernel_cols = 3; // define kernel here (double loop), these are the 1

Can I use DrawBitmap with display independant pixels on android? If not, is there a suitable alternative? Thanks. Are you looking for how to change pixels to dip? then you can use the following code int pixel = 120; final float scale = getResources().getDisplayMetrics().density; int dip = (int) (pixel* scale + 0.5f); you can use this dip, it will be 来源： https://stackoverflow.com/questions/4146328/android-drawbitmap-in-dip

I was wondering if anyone knew of any algorithm to draw a line with specific thickness, based on Bresenham's line algorithm or any similar. On a second thought, I've been wondering about for each setPixel(x,y) I'd just draw a circle, e.g.: filledCircle(x,y,thickness); for every x,y but that would of course be very slow. I also tried to use dictionary but that would fill the memory in no time. Check the pixels I'm about to draw on if they have the same color, but that's also not efficient enough for large brushes. Perhaps I could somehow draw half circles depending on the angle? Any input would

I would like to create a function in Matlab that, given an image, will allow one to select a pixel by clicking on it in the image and return the coordinates of the pixel. Ideally, one would be able to click on several pixels in the image in succession, and the function would store all the respective coordinates in a matrix. Is there a way to do this in Matlab? ginput Graphical input from mouse or cursor Syntax [x,y] = ginput(n) [x,y] = ginput [x,y,button] = ginput(...) Description [x,y] = ginput(n) enables you to identify n points from the current axes and returns their x- and y-coordinates in