# \#object-detection **URL:** https://forum.opencv.org/tag/object-detection/95.md [Latest](https://forum.opencv.org/latest.md) · [Categories](https://forum.opencv.org/categories.md) · [Tags](https://forum.opencv.org/tags.md) --- ## [Object detection model suitable for particular use case](https://forum.opencv.org/t/object-detection-model-suitable-for-particular-use-case/24320)
**Author:** [@Rahul\_Kumar2](https://forum.opencv.org/u/Rahul_Kumar2)\ **Replies:** 0\ **Last updated:** [January 21, 2026, 5:13am UTC](https://forum.opencv.org/t/object-detection-model-suitable-for-particular-use-case/24320 "2026-01-21T05:13:58Z")
The objective is to design a solution which correctly separates standalone bottles from carton-packed bottles(sometimes the bottles are visible and the model is treating as individual bottles) while handling partial cart… --- ## [How to build classic CV algorithm for detecting objects on the road from UAV images](https://forum.opencv.org/t/how-to-build-classic-cv-algorithm-for-detecting-objects-on-the-road-from-uav-images/23012)
**Author:** [@bananaspirit](https://forum.opencv.org/u/bananaspirit)\ **Replies:** 5\ **Last updated:** [July 10, 2025, 10:48am UTC](https://forum.opencv.org/t/how-to-build-classic-cv-algorithm-for-detecting-objects-on-the-road-from-uav-images/23012 "2025-07-10T10:48:53Z")
I want to build an object detector based on a classic CV (in the sense that I don’t have the data for the trained algorithms). The objects that I want to detect are obstacles on the road, it’s anything that can block the… --- ## [Seperating connecting objects](https://forum.opencv.org/t/seperating-connecting-objects/15541)
**Author:** [@Mnejmann](https://forum.opencv.org/u/Mnejmann)\ **Replies:** 3\ **Last updated:** [November 16, 2023, 2:24pm UTC](https://forum.opencv.org/t/seperating-connecting-objects/15541 "2023-11-16T14:24:47Z")
Hey, I’m currently working on a project regarding fish object classification and detection. At the moment we have extracted the blobs from the original image, however in some of the images we are encountering an issue wh… --- ## [Is there a recommended evaluation framework to evaluate and tune detection models?](https://forum.opencv.org/t/is-there-a-recommended-evaluation-framework-to-evaluate-and-tune-detection-models/13271)
**Author:** [@lprevost](https://forum.opencv.org/u/lprevost)\ **Replies:** 3\ **Last updated:** [May 23, 2023, 4:42pm UTC](https://forum.opencv.org/t/is-there-a-recommended-evaluation-framework-to-evaluate-and-tune-detection-models/13271 "2023-05-23T16:42:06Z")
Is there a recommended framework for conducting evaluation/test and parameter tuning in OpenCV similar to other frameworks such as scikit-learn? I’m building an object detection framework that may involve some tracking … --- ## [YOLO v8 Ultralytics , Incremental Learning](https://forum.opencv.org/t/yolo-v8-ultralytics-incremental-learning/12738)
**Author:** [@Hassan](https://forum.opencv.org/u/Hassan)\ **Replies:** 1\ **Last updated:** [April 9, 2023, 6:53pm UTC](https://forum.opencv.org/t/yolo-v8-ultralytics-incremental-learning/12738 "2023-04-09T18:53:30Z")
I am using YOLO v8 ultrlytics, pretrained weights on COCO dataset. It is trained on 80 classes. Now I want to add some more classes in my trained model, without losing previous one. For example I have 4 new classes. So I… --- ## [Object Detection using an Object's corner colors](https://forum.opencv.org/t/object-detection-using-an-objects-corner-colors/11330)
**Author:** [@angela804](https://forum.opencv.org/u/angela804)\ **Replies:** 5\ **Last updated:** [January 23, 2023, 9:29am UTC](https://forum.opencv.org/t/object-detection-using-an-objects-corner-colors/11330 "2023-01-23T09:29:23Z")
Hi! I’m trying to implement a system. Supposed that I want to create an object detection using an object’s corners where it has a color. My initial plan is to detect the colors and make a contour around it using the … --- ## [OpenCV C++ Example Error](https://forum.opencv.org/t/opencv-c-example-error/11212)
**Author:** [@kahretsinanil](https://forum.opencv.org/u/kahretsinanil)\ **Replies:** 1\ **Last updated:** [December 5, 2022, 1:53pm UTC](https://forum.opencv.org/t/opencv-c-example-error/11212 "2022-12-05T13:53:22Z")
Hi, I try to run OpenCV C++ code with RISCV architecture. I’m following the DNN Googlenet link but I always take this error shown below. The code I try to run: OpenCV: Load Caffe framework models root@ubuntu:/home/an… --- ## [Extracting region with a person - CV approach](https://forum.opencv.org/t/extracting-region-with-a-person-cv-approach/10934)
**Author:** [@klutzzykitty](https://forum.opencv.org/u/klutzzykitty)\ **Replies:** 4\ **Last updated:** [November 14, 2022, 7:55am UTC](https://forum.opencv.org/t/extracting-region-with-a-person-cv-approach/10934 "2022-11-14T07:55:10Z")
What would be a better CV approach here? The goal: Extract the person or the area within (or with) the bounding box that includes the person. The object detection isn’t done by OpenCV and there isn’t any access to obje… --- ## [Improving the image for 4-point contour approximation](https://forum.opencv.org/t/improving-the-image-for-4-point-contour-approximation/10599)
**Author:** [@Jaster111](https://forum.opencv.org/u/Jaster111)\ **Replies:** 0\ **Last updated:** [October 18, 2022, 4:15pm UTC](https://forum.opencv.org/t/improving-the-image-for-4-point-contour-approximation/10599 "2022-10-18T16:15:29Z")
Hi everyone, I’m creating a YuGiOh card detector based exclusively on OpenCV and Tesseract OCR. First I make a binary image and then find the contours that can be approximated with 4 points. The problem is that sometim… --- ## [Calculating distance travelled by uncontrolled animal](https://forum.opencv.org/t/calculating-distance-travelled-by-uncontrolled-animal/9853)
**Author:** [@rendevoo](https://forum.opencv.org/u/rendevoo)\ **Replies:** 4\ **Last updated:** [August 16, 2022, 7:32am UTC](https://forum.opencv.org/t/calculating-distance-travelled-by-uncontrolled-animal/9853 "2022-08-16T07:32:37Z")
Hi there! I wonder if OpenCV can actually analyze a video and calculate the distance traveled by an animal inside the cage. I have videos of a bat flying around a cage system. I am trying to quantify locomotion. I am su… --- ## [Using shape inside a picture as template for matching](https://forum.opencv.org/t/using-shape-inside-a-picture-as-template-for-matching/8615)
**Author:** [@skrippsta](https://forum.opencv.org/u/skrippsta)\ **Replies:** 0\ **Last updated:** [May 2, 2022, 2:25pm UTC](https://forum.opencv.org/t/using-shape-inside-a-picture-as-template-for-matching/8615 "2022-05-02T14:25:23Z")
Hey, I want to build a program that will detect shapes and use them as a template for the Template Matching- or Shape Matching- algorithm . In the next step identical shapes inside the image will be marked. Do you think… --- ## [Algorithm to find identical shapes/objects in image](https://forum.opencv.org/t/algorithm-to-find-identical-shapes-objects-in-image/8559)
**Author:** [@skrippsta](https://forum.opencv.org/u/skrippsta)\ **Replies:** 1\ **Last updated:** [April 27, 2022, 1:38pm UTC](https://forum.opencv.org/t/algorithm-to-find-identical-shapes-objects-in-image/8559 "2022-04-27T13:38:41Z")
Hey, I’m currently stuck on the problem that I want to mark objects that appear multiple times in an image (for example for two identical circles or two identical triangles). I want the initial image to mark the objects… --- ## [Detection of geometric shapes based on contours](https://forum.opencv.org/t/detection-of-geometric-shapes-based-on-contours/8501)
**Author:** [@Giacomo\_Zamprogno](https://forum.opencv.org/u/Giacomo_Zamprogno)\ **Replies:** 1\ **Last updated:** [April 22, 2022, 3:39pm UTC](https://forum.opencv.org/t/detection-of-geometric-shapes-based-on-contours/8501 "2022-04-22T15:39:58Z")
I am trying to implement a basic “greedy” heuristic for dissection puzzles like the tangram: given a geometric shape I would need to extract an area in a silhouette where such figure might fit, with a given degree of sim… --- ## [Struggling with Processing this Image for Detection](https://forum.opencv.org/t/struggling-with-processing-this-image-for-detection/7687)
**Author:** [@Falcon](https://forum.opencv.org/u/Falcon)\ **Replies:** 4\ **Last updated:** [March 8, 2022, 11:23pm UTC](https://forum.opencv.org/t/struggling-with-processing-this-image-for-detection/7687 "2022-03-08T23:23:06Z")
This is the major culprit, I am not sure how to go about processing these images, do note, I’m still pretty new to the OpenCV libraries. I’ve tried binary color but that still leaves some really large gaps. Afterwards… --- ## [Box detection method?](https://forum.opencv.org/t/box-detection-method/7125)
**Author:** [@elmanol](https://forum.opencv.org/u/elmanol)\ **Replies:** 3\ **Last updated:** [January 14, 2022, 10:41am UTC](https://forum.opencv.org/t/box-detection-method/7125 "2022-01-14T10:41:24Z")
Hello everyone :smiley:, I’m working on a project where I have to count the number of drink crate boxes like shown in the image below: Note: The aruco markers in the picture are irrelevant to this project. Specific… --- ## [OpenCV C++ and Yolo v5](https://forum.opencv.org/t/opencv-c-and-yolo-v5/4973)
**Author:** [@yusuf\_satilmis](https://forum.opencv.org/u/yusuf_satilmis)\ **Replies:** 5\ **Last updated:** [January 7, 2022, 5:02pm UTC](https://forum.opencv.org/t/opencv-c-and-yolo-v5/4973 "2022-01-07T17:02:13Z")
Hi, I need your help with a project that I need to do object detection. I need to detect an object in the project. As hardware, I will use the i.MX8M Plus module with an internal npu unit. That’s why I searched for the … --- ## [DnnInvoke.ReadNetFromDarknet GPU Memory Only](https://forum.opencv.org/t/dnninvoke-readnetfromdarknet-gpu-memory-only/6534)
**Author:** [@Luis\_Benavides\_Dalme](https://forum.opencv.org/u/Luis_Benavides_Dalme)\ **Replies:** 4\ **Last updated:** [December 3, 2021, 5:48pm UTC](https://forum.opencv.org/t/dnninvoke-readnetfromdarknet-gpu-memory-only/6534 "2021-12-03T17:48:54Z")
Hi, I am working with Emgu.CV(4.5.3.4725) DnnInvoke.ReadNetFromDarknet based on OpenCV 4.5.3. I create several Net instances from DnnInvoke.ReadNetFromDarknet that they use Nvidia Cuda GPUs. My concern is that each ins…