7/23/2023 0 Comments Meshgrid in scilab![]() A single-channel matrix will be shown as a grayscale image. imshow( img ) shows the matrix “img” as an image. The 7th line tells the program to mark the points inside the circle as 1. Note that a dot before the caret indicates an element-wise exponentiation. Wildflowers should continue to bloom over the next several weeks. The 6th line of code calculates the distance of every pixel from the origin, in this case near the center of the image. meshgrid( ) creates a grid from x and y, thus making a grid of nx by ny points, here 100×100 pixels. linspace( start, end, npoints ) generates an array starting at “start” and ends at “end” and dividing it into a number of points “npoints”, inclusive of the endpoints. nx and ny are the horizontal and vertical dimensions of the image in pixels, respectively. We are the Sensing and Robotics for Infrastructure lab, SRI. ![]() ![]() 1 nx = 100 ny = 100 // Dimensions of imageĥ = meshgrid( x, y ) // Generates a grid from -1 to 1Ħ circ = sqrt( X.^2 + Y.^2 ) // Calculates distance from center I have 4 variables X, Y, Z and C, and I want to plot these on a graph. ![]() To get started, let us start with a simple exercise, generating a circular aperture. Best way to plot a 4 dimensional meshgrid. Scilab easily handles these data types and also come with an image processing package that can make our lives easier in image processing. For this activity and the following ones, I will use the latest version of Scilab, Scilab 6.0, and the Image Processing and Computer Vision (IPCV) Toolbox. Handling images would certainly need a programming software that could efficiently handle arrays and matrix operations. Scilab is a scientific computing software similar to MATLAB, from syntax to functionality but not the price (it’s FREE!). ![]()
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