pixel

#include <opencv2/opencv.hpp> #include <iostream> /** 输出指定格式的棋盘图 @param width 棋盘的宽度，不要超过10000. @param height 棋盘的高度，不要超过10000. @param pixel 每个格子的大小，建议行和列的格子数一个为奇数一个为偶数 @param fileName 输出的文件名，支持相对路径和绝对路径，支持png、jpg、bmp等. */ static int checkerboard(int width, int height, int pixel, const char* fileName) { if (width > 0 && height > 0 && pixel > 0 && width <= 10000 && height <= 10000 && pixel <= width && pixel <= height && fileName) { cv::Mat image = cv::Mat::zeros(cv::Size(width, height), CV_8U); uchar* uc = image.data; for (size_t j = 0; j < height; j++) { for (size_t i = 0; i < width; i++) { if (

I'm currently working on an app that allows the user to draw pixelated images using OpenGL ES, but I don't know how to implement an undo function. How could I do it? I thought of using an image for every pixel and adding it to an array. Basically, how can I store the rectangles I use as pixels? charse you can try : NSData *data = [NSData dataWithBytes:vertexBuffer length:vertexCount * sizeof(GL_FLOAT) * 2] ; if (self.vertexBuffers == nil) self.vertexBuffers = [[NSMutableArray alloc] init]; [self.vertexBuffers addObject:data]; save every draw point to a array; if undo clear old buffer

Say that I have two matrices of the following sizes: matrix_1 = 30090x2 matrix_2 = 170x177 Assume here that the number of rows n matrix_1 represents the number of pixels . You can see that the size of matrix_2 is equal to the number of pixels. What I'm trying to do is map the pixels in matrix_1 to the pixels in matrix_2 , such that for example: matrix_1(1) = matrix_2(1) matrix_1(2) = matrix_2(2) matrix_1(3) = matrix_2(3) ...... ...... matrix_1(n) = matrix_2(n) How can I do that in matlab ? Here is an option matrix_1 = matrix_2(:); which copies the elements (all of them) of matrix_2 in one long

I need to create 12 coloured images from a single greyscale image ( red orange yellow etc ) Source image is actually a PNG, RGBA: I'm using a library I found ( https://github.com/PaulSolt/UIImage-Conversion/ ) to break the UIImage into a RGBA byte array which I then process pixel by pixel, and use the same library to reconstitute a new UIImage. This is my code: - (UIImage*) cloneWithTint3: (CGColorRef) cgTint { enum { R, G, B, A }; // - - - assert( CGColorGetNumberOfComponents( cgTint ) == 4 ); const float* tint = CGColorGetComponents( cgTint ); // - - - int w = self.size.width; int h = self

I'm trying to make a java sand game and can't get past one bit. i've made my method that draws a rectangle at mouseX and mouseY, and i have set it up so it updates every frame so it constantly follows the mouse. what i assume is that i would use an array to create each rectangle, and from there would use a pre-defined algorithm to float to the ground, I'm all good with that, i just don't understand how to 'hook my method' up to an array. This is the method i am using to draw the rectangle (in it's own class called Methods) import org.newdawn.slick.Graphics; public class Methods { public

how would you go about reading the pixel value in HSV format rather than RGB? The code below reads the pixel value of the circles' centers in RGB format. Is there much difference when it comes to reading value in HSV? int main(int argc, char** argv) { //load image from directory IplImage* img = cvLoadImage("C:\\Users\\Nathan\\Desktop\\SnookerPic.png"); IplImage* gray = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1); CvMemStorage* storage = cvCreateMemStorage(0); //covert to grayscale cvCvtColor(img, gray, CV_BGR2GRAY); // This is done so as to prevent a lot of false circles from being detected

I have been trying to check if a pixel on the screen is changing. What do I need to do? I have surfed the internet for a long time with no success. I have experimented with the code given on the net, and found out that my code is only giving data from the screen that was open when the code was run. ie, if the screen was white when the code was run, it will read pixels from the white screen, even though the screen color already changed. from PIL import ImageGrab px=ImageGrab.grab().load() m=px[613,296] print(m) while 1: if m!=px[613,296]: m=px[613,296] print(m) I ran the code and started a