Opencv overlapping area 1 answer Feb 10, 2022 · Hello, I would like to do the operation described on the attached image. To remove it you can always calculate the width needed. I'm not so concerned about the separate non-overlapping ones. These are the important steps: Use morphology to get nice blocks of texts. (I draw the rects to see the overlapping a little easier) . Then Nov 14, 2014 · Here's my attempt at detecting the circles. To get the intersection rectangle and thus the area of intersection (from this link ) with an origin point at the top left: Jan 27, 2018 · As a start i have the coordinates x1,y1 and x2,y2 of a rectangle, on the other hand i have a list of other coordinates for other rectangles. COLOR_BGR2GRAY) im_gauss = cv2. Feb 23, 2015 · Is there any option for finding blob or contour overlap area in opencv. I know that template matching can help to find the templates. The colonies are circular and about 3-5 mm in diameter. Oct 7, 2017 · However, edge detection only counts 1. I need to detect the position and size of all such circles. g. add a comment. x – R1. My problem comes from that several colonies might overlap so that you have shapes consisting of 2-5 partially overlapping circles. It was fine. bitwise_and function. If I use some solidity cutoff (area of blob/area of convex hull), I'm able to count 2. Jun 13, 2020 · So Im having trouble detecting rectangles that are embedded and overlapping as separate rectangles with python OpenCv If given this image: These are rectangles embedded or this image: enter image Jan 11, 2016 · The problem of the black strip is that you put 2 overlapping images inside an image of the size of both of them the black strip is the width of the overlapping area. pyplot as plt import cv2 # source data img_file= "Fig1. The numerator will be lesser as the prediction fails to predict the area inside the ground truth. Thanks Raj . jpg" # create an OpenCV image img= cv2. Unfortunately, the find_intersection method between the vectors from the c++ standard library returns a size 0 because ofcourse there in no overlap of the edges where the two objects meet. Feb 9, 2022 · Calculate the spacing on both sides in rows before the initial overlap. area() > 0); This repository contains an implementation of finding the overlapping area between two objects using OpenCV. But I doesn’t consider a slope. Aug 13, 2017 · Is there a way I can improve the detection of squares? Or a way that I can remove the overlapping contours in the image. Jun 28, 2022 · It is the ratio of the overlap area to the combined area of prediction and ground truth. IoU values range from 0 to 1. I'm a biologist tasked with detecting yeast colonies on a nutrient plate. Detect shapes in an image Move one of them Calculate the area In pixels of the overlap between these two shapes. edit retag flag offensive close merge delete. I’ll crop the section and fill the overlapping area with a white rectangle, that way the content will only be shown on just one image. The correct Jaccard Index formula is: iou = intersection_area / (union_area - intersection_area). Algorithm ideology: If there is an overlap area in the two images, the image matches will be obtained, and a complete panoramic map is obtained, so that it can be converted to an image Apr 11, 2015 · The percentage of overlapping is: area_of_intersection / area_of_union * 100. Method The implementation uses OpenCV functions to detect and extract the contours of both objects and calculates the overlapping area using the cv2. images are same width and such). What i want to do is compare the value of the one i already have over an image to the other ones and see if any overlap with it, and in case any do i want to check if the overlap area is equal to 50% of the original rectangle, this is all just part of the Apr 11, 2015 · The percentage of overlapping is: area_of_intersection / area_of_union * 100. cvtColor(img,cv2. For example, there’s an image A If I apply 8 method to image A, those two overlapping lines would be Oct 20, 2023 · The area of any rectangle can be calculated using the formula: (x_distance) * (y_distance). To get the intersection rectangle and thus the area of intersection (from this link ) with an origin point at the top left: Aug 8, 2022 · To do this I need to find common parts at top and bottom and "samish" overlapping area. When overlapping to some extent, use the slope or RAMP function to find the center of the overlapping area. x) Jan 2, 2021 · If a bounding box overlaps with other, this means that the same block of text will be shared among two or more images. // Show intersection of overlapping rectangle and triangle. Let's see how to detect the corner in the image. Here is an image of where there are overlapping contours: There were 11 contours found in this image but I want only 9. To do this, I have written the following codes: import matplotlib. For Rectangle1: x_distance = abs(L1. And dividing by the area of the union of the two boxes. I have done in a way of creating 2 convex contours and 2 Mats of zeros and fill them with fillConvexPoly() and doing a bitwise_and() between the two Mats for getting the intersection. fitEllipse method. Jan 8, 2013 · // Return the area of the intersection. – Sep 30, 2014 · But i give it a shot. Jan 27, 2018 · As a start i have the coordinates x1,y1 and x2,y2 of a rectangle, on the other hand i have a list of other coordinates for other rectangles. Problem Description: Two images Image1 and IMAGE2 are known to calculate overlapping areas of the two images, and identify overlap areas in Image1 and Image2. cv::putText void putText(InputOutputArray img, const String &text, Point org, int fontFace, double fontScale, Scalar color, int thickness=1, int lineType=LINE_8, bool bottomLeftOrigin=false) Dec 27, 2021 · I’m programming hand palm line detector, which detects main palm lines, not wrinkles. GaussianBlur(gray_img, (5, 5), 0) ret Sep 15, 2021 · Here is a bit more "morphologically rich" solution:-convert image to edges-dilate edges (to improve gradient decent flexibility)-find best match offset for each image to the bottom of the accumulating image Jul 13, 2022 · OpenCV (Open Source Computer Vision) is a computer vision library that contains various functions to perform operations on Images or videos. But I'm having a really hard time detecting them using edge detection. In summary. Nov 19, 2019 · Let's say there are two sub images of a large image. Since the rectangles may overlap, we can use Inclusion Exclusion principle to calculate the area as follows: Total Area = Area of Rectangle1 + Area of Rectangle2 – Intersecting area of both the rectangles. The purpose of my code is, Detection of randomly drawn with and without overlapping ellipses using the cv2. Jul 27, 2015 · now, to find out, if 2 Rects overlap, just check the area of the intersection: bool intersects = ((A & B). What I would ideally want is that whenever there is an overlap it should divide the contours into individual regions. Is there an easier option? Aug 18, 2018 · I have this image and would like to find the intersection points of the two objects ( blue vector and red vector ). So i used 8 directional contour detect method(8 method). Well, go look at the "Jaccard index" (IoU) formula. Next, find the major axis, minor axis and areas of the detected Jul 17, 2014 · I have 2 contours and I want to compare how much the same are they, as the ratio of the area_of_c1/area_of_intersection and area_of_c2/area_of_intersection. Feb 9, 2022 · Hello, I would like to do the operation described on the attached image. But i'm not sure how to find the intersected area and remove them in either one of the sub images. imread(img_file) # convert color image to grey image gray_img=cv2. Please help me out. Mar 30, 2021 · I used the openCV library to detect an object of the image (Fig 1), see below. perform a BGR->HSV conversion and use the V channel for processing; V channel: threshold, apply morphological closing, then take the distance transform (I'll call it dist) Mar 30, 2025 · Fills the area bounded by one or more polygons. Contour[0] Area: 1805, Length: 423, Colour: Red Contour[1] Area: 947, Length: 227, Colour: Green Contour[2] Area: 1825, Length: 415, Colour: Blue As you can see the area of the two crosses are slightly less than double the area Nov 12, 2019 · The only problem is that most of the contour regions are overlapping and I am stuck here on how to deal with it. I am not a professional in opencv module, I wrote my code as a result of research inspired by sources. So I did pre-processing using HPF and here’s the image And now, i have to detect main lines. I am trying to detect the overlapping area of two sub images. Apr 7, 2020 · I would expect the cross to have slightly less than double the area of the rectangle due to the overlap in the center. . Feb 22, 2017 · My goal is to determine the area of overlap and put it into a mask that I can apply to the top right image (that is the one on top in terms of layers) so I can blend it based on the distance using any of there blender opencv uses or another algorithm. cv2. Scan from the top to the middle row and from the bottom to the middle row until the distance cannot be calculated. How can I remove the inner contours? Aug 5, 2021 · I'm sharing the image I'm working on and my code. OpenCV library can be used to perform multiple operations on videos. It is not precise match due to gradients in some apps while scrolling. I see a lot of recommendations to use OpenCV but that seems for panorama photos. I tried using Opencv's Canny function and HoughesCircles function. My case seems much simpler (e. goodFeaturesToTrack() method finds N Aug 17, 2014 · You're calculating the area of the intersection of the two boxes. Generated on Sun Apr 6 2025 23:15:44 for OpenCV by . If the area of the predicted box is higher, the denominator will be higher, making the IoU lower. ypvtj dmsqt iuowz weqmsu aiy gnzsh voll mzfa gnfxs fstch bufyify cuoaf kus atwmy mdftx