invert

i'm new opencv . i writing a remove the background . my input image i coded my program as follow steps : - calculate average pixels //define roi of image cv::Rect roi(0, 0, 20 , 20 ); //copies input image in roi cv::Mat image_roi = imgGray( roi ); //imshow("roi", image_roi); //computes mean over roi cv::Scalar avgPixelIntensity = cv::mean( image_roi ); //prints out only .val[0] since image was grayscale cout << "Pixel intensity over ROI = " << avgPixelIntensity.val[0] << endl; -create new Mat image base on average pixels values : //create new mat image base on avgPixelIntensity cv::Mat

How do I invert the text-color of an element using jQuery? <div style="color: rgb(0, 0, 0)">Invert me</div> yckart A bit late but better late than never: function invert(rgb) { rgb = Array.prototype.join.call(arguments).match(/(-?[0-9\.]+)/g); for (var i = 0; i < rgb.length; i++) { rgb[i] = (i === 3 ? 1 : 255) - rgb[i]; } return rgb; } console.log( invert('rgba(255, 0, 0, 0.3)'), // 0, 255, 255, 0.7 invert('rgb(255, 0, 0)'), // 0, 255, 255 invert('255, 0, 0'), // 0, 255, 255 invert(255, 0, 0) // 0, 255, 255 ); First load http://www.phpied.com/files/rgbcolor/rgbcolor.js Then you can do $.fn

Please bear with me, I've only started python a few weeks ago. I am using JES. I have made a function to convert a picture to grayscale. I created two names for each color r and r1, g and g1, b and b1. The idea behind this, was to keep the original values in memory, so the picture could be restored to it's original color. def grayScale(pic): for p in getPixels(pic): r = int(getRed(p)) g = int(getGreen(p)) b = int(getBlue(p))//I have tried this with and without the int() r1=r g1=g b1=b new = (r + g + b)/3 color= makeColor(new,new,new) setColor(p, color) def restoreColor(pic): for p in getPixels

Can I use ~A to invert a numpy array of booleans, instead of the rather awkward functions np.logical_and() and np.invert() ? Indeed, ~ seems to work fine, but I can't find it in any nympy reference manual, and - more alarmingly - it certainly does not work with scalars (e.g. bool(~True) returns True !), so I'm a little bit worried ... short answer: YES Ref: http://docs.scipy.org/doc/numpy/reference/generated/numpy.invert.html Notice: Computes the bit-wise NOT of the underlying binary representation of the integers in the input arrays. This ufunc implements the C/Python operator ~. and bitwise

精贴： https://blog.csdn.net/haidao2009/article/details/9470295 (十一)洞悉linux下的Netfilter&iptables：iptables命令行工具源码解析【上】 分类： LINUX 2012-05-25 18:05:05 预备知识： part1: 初见getopt_long() 在分析iptables源码时，作为命令解析的核心函数getopt_long()不得不提。随便百度或google搜索关于该函数的介绍有很多例子和解释，这里我只举一例，目的是让大家了解传递给iptables命令的每个参数是如何被正确识别并处理的。 getopt_long(int argc ,char * const argv [],const char * optstring ,const struct option * longopts ,int * longindex ) 参数说明： argc 和 argv 来自main函数的输入； optstring ：表示可以接受的参数。可以是下列值：1.单个字符，表示选项；2.单个字符后接一个冒号“：”表示该选项后必须跟一个参数。参数紧跟在选项后或者以空格隔开，该参数的指针赋给optarg。3.单个字符后跟两个冒号，表示该选项后必须跟一个参数。参数必须紧跟在选项后不能以空格隔开

I need create inverse map - select unique values and for them find keys. Seems that only way is to iterate all key/value pairs, because entrySet returns set of so value not unique? Thanks. dacwe The values in a map may not be unique. But if they are (in your case) you can do as you wrote in your question and create a generic method to convert it: private static <V, K> Map<V, K> invert(Map<K, V> map) { Map<V, K> inv = new HashMap<V, K>(); for (Entry<K, V> entry : map.entrySet()) inv.put(entry.getValue(), entry.getKey()); return inv; } Java 8: public static <V, K> Map<V, K> invert(Map<K, V> map)