roi | 易学教程

Draw an ellipse on a figure and get coordinates_Python

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问题 I'm working on Python 2.7. I have to define some Areas of Interest (AoI) on a picture. Basically, I'm trying to do this drawing an ellipse (or more) on a specific part of the picture and to get the coordinates (x; y) of its contour. I want to save these coordinates on a file, in order to use them later to see whether (or not) my data are inside this area. This is my code: import matplotlib.pyplot as plt import numpy as np from matplotlib.patches import Ellipse, Circle from matplotlib.path

Saving Images of Detected Faces in OpenCV

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问题 I have a code that detects faces and saves multiple cropped area images of them to a file path. My code doesn't stop saving images of detected faces until I physically close the program. For every one second a face is detected on a webcam, my code saves 6 images of the face. Is it possible to have it save just one image per face detected? For example, if there is one face, only one image, if two faces, an image of both faces are saved etc. My code is below. Can anyone help me? #include

OpenCV : set ROI with angle?

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问题 I'd like to use a ROI to copy a found polygon in an image, into a new image. I'd like this polygon to fit exactly in the new image. So far I used ROI, but I noticed that the angle is not taken into account, which give me bad result as soon as I rotate the object I whish to detect. I need this object alone for further analysis... Here is what I do: while(/****/) { CvSeq* approximatedContour = cvApproxPoly(currentContour, sizeof(CvContour), 0, CV_POLY_APPROX_DP, 8); etiquetteBox =

Detect High density pixel areas in a binary image [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . I am doing background subtraction, and I obtain a binary image with foreground objects and with some noise. I want to obtain a ROI for each object on the binary image and them analyze it to ensure that is the object that I want. How do I segment only the areas with high pixel

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

Getting ROI from a Circle/Point

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问题 I have two points in an image, centre left eye (X, Y) and centre right eye (X, Y). I have drawn circles around both eyes using cv::circle , and this is fine. But what I'm now trying to do is get the ROI of the circles I've drawn, i.e. extract the eyes and save them in a new Mat. This is my current result: ...But as I said above, just need to work on extracting the circles around the eyes into a new Mat, one for each eye. This is my code: cv::Mat plotImage; plotImage = cv::imread("C:/temp/face

什么是CPC，CPA，CVR，CTR，ROI? 营销、广告、淘宝术语

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做网络营销的人，我们要知道以下常见名词解释： CPC (Cost Per Click): 按点击计费 CPA (Cost Per Action): 按成果数计费 CPM (Cost Per Mille): 按千次展现计费 CVR (Click Value Rate): 转化率，衡量CPA广告效果的指标（点击/下单） CTR (Click Through Rate): 点击率（点击/曝光(展现)-> 曝光区别于请求，请求不一定会有曝光） PV (Page View): 流量 ADPV (Advertisement Page View): 载有广告的pageview流量 ADimp (ADimpression): 单个广告的展示次数 PV单价: 每PV的收入，衡量页面流量变现能力的指标 RPS (Revenue Per Search): 每搜索产生的收入，衡量搜索结果变现能力指标　 ROI：投资回报率（ROI）是指通过投资而应返回的价值，它涵盖了企业的获利目标。利润和投入的经营所必备的财产相关，因为管理人员必须通过投资和现有财产获得利润。又称会计收益率、投资利润率。来源： oschina 链接： https://my.oschina.net/u/1439326/blog/541400

How to get the actual point when I touch on screen?

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问题 I am developing an android application where i can select region of interest(ROI) when i touch two points on screen. However, when i try to change the resolution of image, the thing goes weird. What it shows does not same with what i touched. Here are my codes, MainActivity.java public class MainActivity extends Activity implements CvCameraViewListener2, OnTouchListener { private static final String TAG = "OCVSample::Activity"; private Camera_View mOpenCvCameraView; private List<Size>

Using ROI in MATLAB

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问题 I have a final project in MATLAB and I need help. I build a GUI and display an image using imshow function, now i want to select area from the image and get the pixls of the Selected area. i know the ROI method but i don't know how to use it, so i be very happy if someone could explain it to me. thanks. 回答1: Selecting a ROI is pretty easy if you have the image processing toolbox. There are many ways to do it, but I recommend using the roipoly function. Simply write: BW = roipoly(I); where I

MASK-RCNN(1)

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MASK-RCNN是一个多用途的网络,可以用来做目标检测,实例分割或者人体姿态识别.主要结构如下. 简单的说,就是首先用Faster-RCNN获得ROI,再进行ROI Align,然后输出ROI的分类,同时输出分割掩码. 1. Faster-RCNN和ROI Align Faster-RCNN是一个两阶段检测器,第一阶段(即RPN)提出候选ROI,再过滤掉一部分,第二阶段对剩下的ROI进行分类. MASK-RCNN对Faster-RCNN做了修改,获得ROI以后并没有马上输出分类,而是进行了ROI Align.ROI Align通过双线性插值获得准确的特征图,而不是四舍五入以后的特征图.例如,如果输出的ROI坐标是[x/16],其中16是特征图步幅,[⋅]表示四舍五入,这样获得的特征图和ROI的坐标并没有完全对端,虽然对分类影响不大,但是对掩码的输出影响较大.ROI Align通过双线性插值获得准确的特征图,如下图所示. 来源： https://www.cnblogs.com/mstk/p/11964150.html