contour

问题 this is the result that I have from my code : enter image description here I've made this mask on my face using contour , as I show bellow in the code . the final result of the project is to delete the face and show the background that I am not defined it yet . my question is : is there any way to make a mask with this counter so i could use something like this cv2.imshow('My Image',cmb(foreground,background,mask)) to just show the foreground under the mask on the background ? ( the problem

问题 I tried to find contours for image, but it gives an error. My code is: import cv2 import numpy as np img = cv2.imread('star.jpg',0) ret,thresh = cv2.threshold(img,127,255,0) contours,hierarchy = cv2.findContours(thresh, 1, 2) error is: Traceback (most recent call last): File "C:\Python27\OpenCVContore.py", line 5, in <module> contours,hierarchy,thresh = cv2.findContours(thresh, 1, 2) error: ........\opencv\modules\core\src\matrix.cpp:236: error: (-215) step[dims-1] == (size_t)CV_ELEM_SIZE

问题 I am working on a project that requires creating an outer contour from a bitmap image. eg. please check the images below. Is there any php library that I can use to achieve this task? I have found open source library http://docs.opencv.org/trunk/d4/d73/tutorial_py_contours_begin.html but this is not on php bitmap image only bitmap with contour Thanks for any clues. 回答1: You can do it with imagemagick. Although there's a PHP API for ImageMagick, I think it's much easier and safer to just spawn

问题 I am given a dataset with various numeric variables. I'll try to plot for each combination of two variables a contour/heat map plot, which shows the distribution/density of datapoints with respect to the corresponding pair. For example, ggplot(data, aes(x=var1, y=var2) ) + stat_density_2d(aes(fill = ..density..), geom = "tile", contour = FALSE )+ scale_fill_gradient2(low="darkblue",high="darkred",mid="white",midpoint=0.005) This results in the following picture The issue is now: My data,

问题 I need to make multiple contours plots of several variables on the same page. I can do this with MATLAB (see below for MATLAB code). I cannot get matplotlib to show multiple legends. Any help would be much appreciated. Python code: import numpy as np from matplotlib import cm as cm from matplotlib import pyplot as plt delta = 0.25 x = np.arange(-3.0, 3.0, delta) y = np.arange(-2.0, 2.0, delta) X, Y = np.meshgrid(x, y) Z1 = X*np.exp(-X**2-Y**2) Z2 = Y*np.exp(-X**2-Y**2) plt.figure() CS = plt

问题 I am working on a project to measure width of contour. I have detected the contour from the image (see image 1). The next step is to measure the width of the coutour along its length (like shown in image 2). Please suggest me any ideas. I truly appreciate your help! Thank you! masked contour image required width measurement from contour, green lines indicate width I have a function that calculates contours and then next step is to measure the width from selected contours along their length.

问题 Below is an example for creating a contour plot with plotly.js. Some of the contour lines overlap . How can I alter the plotly settings to avoid that (e.g. increase resolution , switch contouring algorithm )? If I plot the same data using conrec.js the contours do not overlap. A. Conrec.js (this works, no overlap) Source code for the example: https://github.com/jasondavies/conrec.js/tree/master/example B. Plotly.js (does not work: overlapping contours) Source code for the example: https:/

问题 I have a 3D plot of a disk. Now I would like to plot the surface in color depending on values which are stored in an array. E.g. the radius of the disk is 300mm. The array could like: arr = np.array([[ 114.28, 14], [ 128.57, 16], [ 142.85,19], [ 157.13,20], [ 171.41,21], [ 185.69,22], [ 199.97,24], [ 214.25,27], [ 228.53,29], [ 242.81,30], [ 257.09,31], [ 271.37,34], [ 288.65,35], [ 299.93,36], [ 300,38]]) It means for radius = 114.28 I have the value 14. I would like to plot a circle at

问题 I need to evaluate a function (say) Fxy = 2*x.^2 +3 *y.^2; on a ternary grid x-range (0 - 1), y-range (0-1) and 1-x-y (0 - 1). I am unable to construct the ternary grid on which I need to evaluate the above function. Also, once evaluated I need to plot the function in a ternary contour plot. Ideally, I need the axes to go counter clockwise in the sense (x -> y--> (1-x-y)). I have tried the function function tg = triangle_grid ( n, t ) ng = ( ( n + 1 ) * ( n + 2 ) ) / 2; tg = zeros ( 2, ng );

问题 I need to evaluate a function (say) Fxy = 2*x.^2 +3 *y.^2; on a ternary grid x-range (0 - 1), y-range (0-1) and 1-x-y (0 - 1). I am unable to construct the ternary grid on which I need to evaluate the above function. Also, once evaluated I need to plot the function in a ternary contour plot. Ideally, I need the axes to go counter clockwise in the sense (x -> y--> (1-x-y)). I have tried the function function tg = triangle_grid ( n, t ) ng = ( ( n + 1 ) * ( n + 2 ) ) / 2; tg = zeros ( 2, ng );