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Questions tagged [object-recognition]

The computer vision task of finding and identifying objects in an image or video sequence

The computer vision task of finding and identifying objects in an image or video sequence is often conducted consistent with one of two approaches:

  • Appearance-based methods

    • Use example images (called templates or exemplars) of the objects to perform recognition

    • Objects look different under varying conditions:

  • Feature-based method

    • a search is used to find feasible matches between object features and image features.

    • the primary constraint is that a single position of the object must account for all of the feasible matches.

http://en.wikipedia.org/wiki/Outline_of_object_recognition

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OpenCV: Detect people in city square

I need to find all people or group of people in city square like this. I use CascadeClassifier.detectMultiScale function and prepare image by equalizeHist (correct brightness and contrast) As you can see not all people was found. In description to…
victor1234
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Eye detection and Exception handling

This is my function that I have used to detect my eyes and then transmit some co-ordinates. void detectAndDisplay(cv::Mat frame) { cv::Mat im1,im2; std::vector eye; Mat…
praxmon
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bags of words object recognition for large datasets

I'm implementing object recognition with bags of words histograms. The histograms are composed of 200 "words" per image, kmeans from the descriptors. The problem is that for a large dataset, say 5000 images, we suddenly have 200x5000=1,000,000 words…
mugetsu
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Object Detection - finding animal features within an aerial photograph

I have a small team of developers with the task of identifying farm animals in a series of aerial photographs (from a small UAV) of farmland and/or river settings. I understand this is an open-ended question but can anyone suggest starting places to…
jmc
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Errors while working with OpenCV 2.4.1

I have delphi-7 wrappers for opencv. I have the following errors while executing certain OpenCV methods: cvPyrDown - error: External exception E06D7363. main thread ($1e24): 7c812afb +000052 kernel32.dll …
John
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CBIR with SIFT alike features, discrete- vs. continuous-approach

currently I'm dealing with implementing a CBIR-System for object recognition (object classification in detail) and now since I have some working feature-detectors and -descriptors I try to find the best way for handling these features for the task…
Hans Sperker
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Saving bounding box region as an image in a custom folder

I have a custom trained yolov5 model trained on traffic sign boards. It draws a bounding box around the traffic sign board whenever it recognizes a traffic sign. I want that bounding box to be saved as an image in a custom folder. Do I have to make…
HANEESH NAGA KRISHNA MEKALA
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How to use multiple Custom Cascades in OpenCV Python?

I am using CV2 for Custom Model Detections. Can anyone tell me how to use multiple custom models in one Program? Suppose in Fruit Detection and Recognition System, if I made custom cascades of Banana, Apple, and Oranges. Now, how I gonna use these…
Kashif Iftikhar
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Determining correct arrangement of objects in a picture - how?

Problem Overview: Create an application that can identify the objects in a single photo, and as well as identify the correct arrangement of said objects. I'm relatively new to image processing and image recognition concepts and I've tried looking…
Gioza
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Fittest polygon bounding objects in an image

Is there any method to create a polygon(not a rectangle) around an object in an image for object recognition. Please refer the following images: the result I am looking for and the original image . I am not looking for bounding rectangles like…
Kenil Mehta
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Recognize randomly placed object with the same shape

What will be the best way to get exact location of randomly placed object like one on the picture bellow: I want to build robotic application soo that robot is capable of picking such randomly places metal parts from box. So we have a box with a…
jok23
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Training DeepBelief Network to recognize multiple categories?

The learning example of the DeepBelief framework demonstrates how to train a neural network to recognize one object category. The method used for training jpcnn_train() does not have a category label parameter. However, in the DeepBelief simple…
Senad
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Hardware for image processing (object recognition) from video

What I want to do is to recognize signs on roads using some embedded device with a cam. I was thinking about RaspberryPi 2b, but I don't know if it's power is sufficient. I don't have to analyze every frame of the video, but still the more frames…
DawidPi
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Shape detection with confidence level?

I'm new to object detection and computer vision, but I'm working on a project where I'm taking pictures of disks and I'm hoping to receive a confidence level. For example, if the disk is kind of round but slightly jagged on the edges it can return…
Isabel Zhong
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is there a way to detect pictures in images?

I want to know if there is a way to detect pictures in images. For example, the task is to recognize an apple and a photo of an apple in given image. Is it possible with OpenCV or any other way?
Kundan
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