Opencv calculate distance between two points python. The distance transform function in OpenCV, cv2. An efficient method to scan across rows can be found in the OpenCV documentation A more complicated approach would use Houghlines to extract lines. with distance you mean like measuring the distance between two points on a sheet of paper? Have a look at 2d distance in euclidean vector space: sqrt ( (a. Install Python: If you don't have Python installed, head over to the official Python website (python. But Some times it me There are a number of ways to compute the distance between two points in Python. dist() method returns the Euclidean distance between two points (p and q), where p and q are the coordinates of that point. This example accepts the first and second coordinate points and calculates the distance using math pow and sqrt functions. Discover how to measure the distance *between objects* (in inches, meters, etc. Assume we have previously obtained a contour and have a point. this is just a simple project but an awesome start for cool This uses the ‘haversine’ formula to calculate the great-circle distance between two points – that is, the shortest distance over the earth’s surface – giving an ‘as-the-crow-flies’ distance between the points Write a Python program to find the distance between two points. In this blog post, we'll explore the importance of distance calculation and its applications in image processing. Update: Using a third point between Photo 1 and Photo 2 I created a polynomial function with two degrees (a + bx + cx^2) and now I can calculate distance. More than 150 million people use GitHub to discover, fork, and contribute to over 420 million projects. Measuring the distance between pixels on OpenCv with Python Asked 7 years, 8 months ago Modified 7 years, 8 months ago Viewed 3k times Distance Estimation Using Opencv and ArUco Marker: The project aims to estimate the distance of an ArUco marker using an OpenCV Python program and a camera. It wasserstein_distance # wasserstein_distance(u_values, v_values, u_weights=None, v_weights=None) [source] # Compute the Wasserstein-1 distance between two 1D discrete distributions. euclidean) when you want a clear, readable function for pairwise distances or plan to use other distance metrics from SciPy. I used a for loop, but it only give me one result. distanceTransform (), takes in a binary image and returns two arrays: the distance image and the label image. The slant range, on the other hand, is the direct distance between two points on the Earth’s surface. norm () function computes the norm (or magnitude) of a vector, which in the case of the difference between two points, gives us the Euclidean distance. To get the real units, divide the distance by the image's width, resulting in a number between 0 and 1, and multiply that number by the width of the image in reality – that is, the span of the rightmost and I want to measure actual distance between two points like on the road there is a vehicle in front of me,Whats the distance between me and the vehicle? I proceeded like this : 1) Found the Perspec I have video taken from car. I have the angle of the line, the x,y of the start point and the x,y of the end point. norm () np. norm) when you need fast, vectorized distance calculations for large arrays or numerical computations. I measured speed and the result is about ±4 Km/h. Hello, I asked a month about a code that can measure the distance betweet two points, but I think the result is in pixels, so would like to get the distance, but in cm. my input image and desired point are: skeleton, distance = medial_axis (cimg, return_distance=True) The math. Method 2: Calculating Distances to All Contour Points Another approach is to calculate the Euclidean distance between the point and all Prerequisite: Introduction to OpenCV In this article, we are going to see how to calculate the distance with a webcam using OpenCV in Python. Jul 23, 2025 · In this article, we are going to see how to calculate the distance with a webcam using OpenCV in Python. 6 env in anaconda and install a dlib wheel supported for python 3. Thank you E. so I have a program that measures the distance between two objects in an image. You can compute the distance directly or use methods from libraries like math, scipy, numpy, etc. com OpenCV python code to calculate distance of object relative to a point python, opencv asked by a_sid on 05:36AM - 25 Jul 22 UTC The script uses two given points and the distance formula to calculate the distance between the two points on the image in pixels. Using np. -- Update 2 -- The following article is really useful (although it is using Python instead of C++) if you are using a single camera to calculate the distance: Find distance from camera to object/ma In various fields such as mathematics, physics, computer graphics, and data analysis, calculating the distance between two points is a fundamental operation. The Wasserstein distance, also called the Earth mover’s distance or the optimal transport distance, is a similarity metric between two probability distributions [1]. We provide code in Python and C++. We then pass these to cv2. y)^2) OpenCV and NumPy installation is using pip install and dlib installation using pip only works if you have cmake and vs build tools 2015 or later (if on python version>=3. . How can I do it? One option maybe could be to calculate the distance between one edge and the skeleton to obtain the half-width. Mediapipe pose. To clarify, I already have two existing OpenCV programs that calculate a single point each. x-b. Sep 7, 2021 · I have a code that allows me to open an image and click to add points on the picture and it shows me their coordinates as shown below: The coordinates are already being displayed. Learn how to build a real time bad posture alert application. I have sussed that I need to go 1 pixel away at a 90° angle from the original line from each end and draw a line between these new endpoints. I have two cameras and an ArUco marker, and I’m trying to determine the distance and direction from one camera to the marker and to the other camera. It's a simple and efficient way to find the distance. I posted a question on Stack Overflow with a different image but the same problem: stackoverflow. Is there a good function for that in OpenCV? I'm working on a project where I am trying to calculate the distance and angle of a small LED light from a single camera. I want to find medial axis distance transform at middle, fifth pixel at each end point. However, the program automatically takes the leftmost object as the "reference image". Output: Shortest distance: 25. Distance between two points in OpenCv based on known measurement [closed] Asked 6 years, 6 months ago Modified 4 years, 2 months ago Viewed 7k times -- Update 2 -- The following article is really useful (although it is using Python instead of C++) if you are using a single camera to calculate the distance: Find distance from camera to object/ma This tutorial explains how to calculate Euclidean distance in Python, includings several examples. x)^2 + (a. linalg. Apr 4, 2016 · Discover how to measure the distance *between objects* (in inches, meters, etc. Finding the distance from your camera to object/marker using Python and OpenCV Let’s go ahead and get this project started. ArUco markers are square markers with a unique pattern that can be detected by a camera, making them useful for various applications such as au… Nearly every scientist working in Python draws on the power of NumPy. I want to calculate the euclidean distance between two vectors (or two Matrx rows, doesn't matter). norm. Use SciPy (distance. I'm struggling to find an answer to this. 7) The easiest way is to create a python 3. Computer vision and image processing algorithms can then be used to automatically determine the perceived width/height of the object in pixels and complete the triangle similarity and give us our focal length. From that it is possible to work out a distance formula, assuming the lines are parallel. NumPy brings the computational power of languages like C and Fortran to Python, a language much easier to learn and use. Oct 3, 2023 · It involves measuring the spatial separation between pixels or points in an image using different distance metrics. The scipy distance is twice as slow as numpy. Realtime Distance Estimation Using Python OpenCV To get started, we need to install OpenCV and its dependencies. The printed result shows this distance. ) in an image using OpenCV, Python, and computer vision + image processing. Sep 7, 2021 · I need to create that loop that take the current point I just made and the previous one to calculate the distance. By using it, one can process images and videos to identify objects, faces, or even the handwriting of a human. when i see the calculated distance and my object's centroid coordinates, i found something strange: There are distance (UZAKLIK) and coordinate (KONUM) values in the area between dotted lines. This script is running well for left side video and right side video. In the following picture X is start height of the license plate in pixels and Y is the distance in meters. We will wri Tagged with python, tutorial, showdev, computervision. Note: The two points (p and q) must be of the same dimensions. I have two group of lists, A and O. Body posture detection and analysis system using MediaPipe and OpenCV. My program is measuring distance between front wheel and white line on road. Let's understand how to find the shortest distance between a given point and a contour of an object in an image with the help of some Python examples. GitHub is where people build software. Example The distance transform function in OpenCV, cv2. Python, with its simplicity and rich libraries, provides several ways to achieve this task. Jul 8, 2025 · In this comprehensive guide, we'll explore how to implement realtime distance estimation using OpenCV and Python, starting from the fundamentals and progressing to advanced techniques and applications. Let's discuss a few ways to find Euclidean distance by NumPy library. How can I draw two more lines, one 1 pixel away, on each side of the original line. Both of them have points from x,y z coordinate. I know there’s the cv2. Make sense now? Awesome. 6. The distance image contains the distance values of each pixel from the nearest non-zero pixel, and the label image contains the labels of the nearest non-zero pixels. This blog post will explore the concepts, methods, and best practices for calculating the distance between two points in Python. Then I need to calculate the distance between point1 and point2 with the knowing formula as we know the pixel coordinates (x1,y1) of point1 and (x2,y2) of point2. Good morning to all, I have an image with the skeleton and the object’s edge, and I have to find, for each skeleton pixel, the closest edge pixel. Print the computed shortest distance between the point and object contour in the input image. org) and download the latest version compatible with your operating system. Example If it is any help, we are trying to calculate the distance between a line, which reaches from two convex hull points, and a defect point. Let’s move into some code to see how finding the distance from your camera to an object or marker is done using Python, OpenCV, and image processing and computer vision techniques. The distance (in inches or meters) of the camera to the marker in step 1. In this post, we will learn how to create a custom low-cost stereo camera (using a pair of webcams ) and capture 3D videos with it using OpenCV. This article focuses on detecting objects. The reason we can't use an approximated expression like that, is because when the object we are calculating on is rotated, the propositions are changed, changing the approximated result. I want to calculate the distance between points from A and B. Distance between consecutive objects is calculated using the Euclidean formula: \ ( d = \sqrt { (x_2 - x_1)^2 + (y_2 - y_1)^2} \ This pixel distance is then multiplied by a distance calibration factor (distance_threshold = 0. I’m not getting the answers I expect, but I don’t know which steps I have wrong or what steps I might be missing. pointPolygonTest(), which returns the shortest distance. I am working with the following formula to calculate distance: distance to object (mm) = focal length (mm) * real height of the object (mm) * image height (pixels) If it is any help, we are trying to calculate the distance between a line, which reaches from two convex hull points, and a defect point. It is very difficult for getting a perfect distance between gaps and objects, Here using OpenCV, some possibilities can be made - VigneswaranB97/Finding-distance-between-objects-in-an-image-using-OpenCV Distance This uses the ‘ haversine ’ formula to calculate the great-circle distance between two points – that is, the shortest distance over the earth’s surface – giving an ‘as-the-crow-flies’ distance between the points (ignoring any hills they fly over, of course!). The ‘Calculating Distance in Python‘ blog explains how to calculate distances using the distance formula in Python. Today I want to show you how to calculate the distance between the objects in the image. 4 In this snippet, we first import OpenCV. today in this video I have created an awesome cool project which can calculate the distance between the motion and the fixed position. In various fields such as geodesy, aviation, and satellite communication, it is crucial to calculate parameters like azimuth (bearing), elevation angle, and slant range between two geographic points. Draw the point and the detected contour in the image for better visualization. I'm trying to develop a solution to segment corneal tomographies, and check for the distance between the cornea and a contact lens. For such, i thresholded the image and extracted the biggest 3 con Hello, I asked a month about a code that can measure the distance betweet two points, but I think the result is in pixels, so would like to get the distance, but in cm. distanceTransform, but I don’t know how I should set all the arguments. The primary inputs of the project I posted a question on Stack Overflow with a different image but the same problem: stackoverflow. It will give you two points on each line (hopefully you only have two). 06912) to convert to centimeters. y-b. I am a newbie in OpenCV. com OpenCV python code to calculate distance of object relative to a point python, opencv asked by a_sid on 05:36AM - 25 Jul 22 UTC I'm using Python+Numpy (can maybe also use Scipy) and have three 2D points (P1, P2, P3); I am trying to get the distance from P3 perpendicular to a line drawn between P1 and P2. y +4x -1000 = 0 for the left line y -4x +1560 = 0 for the right line When my object moves towards left line, it starts to mess up the distance. Use NumPy (linalg. uubfr, lkwjg, ob01e, cp6jb, jnpgw, j1w3, 4ckx, aytph, lw9kb, ltfgi,