mask | 易学教程

SVG Image Masking on Firefox

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问题 recently I create hexagon SVG, and I plan to implement it for image masking for firefox. currently its only working for Chrome http://jsfiddle.net/brokeneye/WKEbw/ I already try to use mask: url but it seems doesn't work. Solved Found the solution for this, its working on Firefox, chrome, safari, opera and IE9. Need to define the img on the SVG. the sample code is on this fiddle below http://jsfiddle.net/brokeneye/ygsKm/ 回答1: Firefox supports what you want to do in a different way. You can

R raster plotting an image, draw a circle and mask pixels outside circle

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问题 Code below plots an image and then plots circle on that image. I want to make all pixels that fall outside that circle black. How could I do that? library(raster) library(plotrix) r1 <- brick(system.file("external/rlogo.grd", package="raster")) width=50 height=40 x <- crop(r1, extent(0,width,0,height)) plotRGB(x) circlex=20 circley=15 radius=10 draw.circle(circlex,circley,radius,border="blue") 回答1: Look at the 'x'-object with str() and you see this: ..@ data :Formal class '.MultipleRasterData

Using a div as a clipping mask in css

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问题 I have a background image that has background-size:cover; applied to it and then a series of divs overlaid which I would like to become individual clipping masks. I've looked at the feature clip: rect(20px, 20px, 20px, 20px,); however as the divs are brought in through a CMS system, it will be inappropriate to define set sizes. Is there a way of setting the div with a clipping mask property so that it clips the image anywhere the div is placed on the page? I don't particularly want to use an

How to apply a clipping mask to geom in a ggplot?

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问题 I am trying to apply a clipping mask to a geom from a ggplot to mask part of the data, but keep the axis, the grid, other geoms and the legend visible. I do not want to create a specific plot, and therefore I am not looking for a work-around with polygons masking some parts of the plot. This is the kind of design I would like to emulate (the mask, not necessarily theme, I now how to do that): (source) See also this example One could argue that I could filter the data that is not contained in

opencv_1

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opencv-python选择ROI 矩形选择框 import cv2 import imutils img = cv2.imread("./test_image.jpg") img = imutils.resize(img, width=500) roi = cv2.selectROI(windowName="roi", img=img, showCrosshair=True, fromCenter=False) x, y, w, h = roi cv2.rectangle(img=img, pt1=(x, y), pt2=(x + w, y + h), color=(0, 0, 255), thickness=2) cv2.imshow("roi", img) cv2.waitKey(0) cv2.destroyAllWindows() 多边形选择框，主要利用鼠标交互进行绘制：单击左键，选择多边形的点；单击右键，删除最近一次选择的点；单击中键，确定ROI区域并可视化。按”S“键，将多边形ROI区域的点保存到本地”config.pkl"文件中。 import cv2 import imutils import numpy as np import joblib pts = [] # 用于存放点 # 统一的：mouse callback function def draw

Extraction part of image that matches to a mask in OpenCV

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问题 In a OpenCV application with Python , i have a mask and an RGB image, i want to extract part of image that matches to mask but i dont know how. for example this is a mask: and i want to do like this: i do this: temp = cv2.bitwise_and(img ,img, mask=feature_map) but it gives me and error: cv2.error: /Users/mee/opencv/modules/core/src/arithm.cpp:1589: error: (-215) (mtype == CV_8U || mtype == CV_8S) && _mask.sameSize(*psrc1) in function binary_op 回答1: You can do something like: mask = cv2

Auto-Resize UITableView Headers on Rotate (Mostly on iPad)

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问题 I feel like this is going to be a simple answer revolving around AutoResizingMasks, but I can't seem to wrap my head around this topic. I've got an iPad app that shows 2 UITableViews side-by-side. When I rotate from Portrait to Landscape and back, the cells in the UITableView resize perfectly, on-the-fly, while the rotation is occurring. I'm using UITableViewCellStyleSubtitle UITableViewCells (not subclassed for now), and I've set the UITableView up in IB to anchor to the top, left and bottom

How to “zero” everything within a masked part of an image in OpenCV

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问题 If I have an image (IplImage 8-bit) and a binary mask (which is also an 8-bit IplImage of the same size, where every pixel has a value of either 0 or 255), how can I make every pixel in the image that corresponds with a pixel in the mask with a value of zero have a value of zero, and every pixel in the image that corresponds with a pixel in the mask with any other value (namely 255) have the same value as in the original image? In other words, anything that is "in the mask area" will keep its

How to draw on bitmap using another bitmap as mask?

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问题 I want to draw on a bitmap using another bitmap as mask. The mask is a black bitmap with a transparent object in it. I want this transparent part to be filled with an arbitrary color and added to my original image. How can this be done? + + blue color = 回答1: I had to change the masks as described by @Christian. Then, the wanted result could easily be produced: canvas.drawRect(rect, paint); paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); canvas.drawBitmap(mask, 0.0f, 0.0f, paint); 回答2:

Javascript phone mask for text field with regex

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问题 I'm using this function to phone mask and works almost perfectly. function mask(o, f) { v_obj = o; v_fun = f; setTimeout("execmask()", 1) }; function execmask() { v_obj.value = v_fun(v_obj.value) }; function mphone(v){ v=v.replace(/\D/g,""); v=v.substring(0, 11); v=v.replace(/^(\d{2})(\d)/g,"(OXX$1) $2"); v=v.replace(/(\d)(\d{4})$/,"$1-$2"); return v; } Here I run the mask in the text field: <input type="text" id="phone" name="phone" onkeypress="mask(this, mphone);" onblur="mask(this, mphone)