Questions tagged [object-detection]

Object detection deals with recognizing the presence of objects of a certain semantic class (e.g. “humans”, “buildings”, “cars”, &c) in digital image and video data.

31
votes
4answers
46k views

OpenCV C++/Obj-C: Advanced square detection

A while ago I asked a question about square detection and karlphillip came up with a decent result.Now I want to take this a step further and find squares which edge aren't fully visible. Take a ...
23
votes
1answer
55k views

Simple object detection using OpenCV and machine learning

I have to code an object detector (in this case, a ball) using OpenCV. The problem is, every single search on google returns me something with FACE DETECTION in it. So i need help on where to start, ...
13
votes
2answers
14k views

Square detection doesn't find squares

I'm using the program squares.c available in the samples of OpenCV libraries. It works well with every image, but I really can't figure it out why it doesn't recognize the square drawn in that image...
25
votes
2answers
13k views

Train Tensorflow Object Detection on own dataset

After spending a couple days trying to achieve this task, I would like to share my experience of how I went about answering the question:How do I use TS Object Detection to train using my own ...
29
votes
6answers
44k views

overlay a smaller image on a larger image python OpenCv

Hi I am creating a program that replaces a face in a image with someone else's face. However, I am stuck on trying to insert the new face into the original, larger image. I have researched ROI and ...
33
votes
4answers
58k views

OpenCV Object Detection - Center Point

Given an object on a plain white background, does anybody know if OpenCV provides functionality to easily detect an object from a captured frame? I'm trying to locate the corner/center points of an ...
57
votes
11answers
43k views

What are good algorithms for vehicle license plate detection?

BackgroundFor my final project at university, I'm developing a vehicle license plate detection application. I consider myself an intermediate programmer, however my mathematics knowledge lacks ...
4
votes
2answers
19k views

Object detection with OpenCV Feature Matching with a threshold/similarity score - Java/C++

I am in the process of creating a small program which detects objects(small image) in the large image and I am using OpenCV java. As I have to consider rotation and scaling I have used ...
13
votes
2answers
35k views

how to detect region of large # of white pixels using opencv?

i want to detect logo inside image in order to remove it , i have an idea that's to look for objects which have the big number of pixels then remove , another idea is to loop through all the white ...
16
votes
3answers
4k views

TensorFlow Object Detection API Weird Behavior

I was playing with TensorFlow's brand new Object Detection API and decided to train it on some other publicly available datasets.I happened to stumble upon this grocery dataset which consists of ...
78
votes
3answers
36k views

What is “semantic segmentation” compared to “segmentation” and “scene labeling”?

Is semantic segmentation just a Pleonasm or is there a difference between "semantic segmentation" and "segmentation"? Is there a difference to "scene labeling" or "scene parsing"?What is the ...
22
votes
2answers
23k views

OpenCV detectMultiScale() minNeighbors parameter

I'm currently using Haar classifiers, to detect objects.On my way, I didn't understand what is the minNeighbors parameter, what isit representing?Actually I don't understand what are the neighbors ...
13
votes
2answers
25k views

OpenCV cvFindContours - how do I separate components of a contour

I've been playing around with OpenCV and with alot of trial and error have managed to learn how to detect circles (coins) in a photo. Everything is working great, except when I place coins directly ...
9
votes
1answer
27k views

Full body detection and tracking using OpenCV+Python-2.7

There are a lot of materials available to do this with C++. I would to know if there is a way to do full body detection using OpenCV in Python-2.7?Given video of a person walking along the sagittal ...
5
votes
1answer
9k views

DETECT the Edge of a Document in iPhoneSDK

I am looking something like attached image, How can I implement this in iPhoneSDK.Can anybody suggest me some open source API or Algorithm Code to detect the corners of captured image of a document....
17
votes
3answers
37k views

OpenCV - Object matching using SURF descriptors and BruteForceMatcher

I have a question about objects matching with OpenCV.I'm useing SURF algorithm implemented in opencv 2.3 to first detect features on each image, and then extracting the descriptors of these features....
12
votes
1answer
5k views

Finding people silhouette in OpenCV C++

I would like to extract the silhouette of a human in a photo and remove the background. The photo could be taken of the full body, only the upper body or only the lower body.What I have done so far ...
1
vote
1answer
2k views

How to detect the skin color of face from the source image in ios 5?

I need to color the skin of the face...How do i find the skin color?now i get the skin color by RGB pixel value ...Still i am facing the problem i was matching the color coordinates to match the ...
7
votes
5answers
9k views

Calculating percentage of Bounding box overlap, for image detector evaluation

In testing an object detection algorithm in large images, we check our detected bounding boxes against the coordinates given for the ground truth rectangles.According to the Pascal VOC challenges, ...
1
vote
0answers
2k views

SSD-mobilenet object detection algorithm not converging

Hi I am trying to train SSD -mobilenet in-order to detect 13 classes. I also trained a faster rcnn -resnet101 . My training data images have resolution of 265 * 450 . (most of them) and each class ...
5
votes
4answers
5k views

Tensorflow Object Detection API on Windows - error “ModuleNotFoundError: No module named 'utils'”

I'm attempting to get the TensorFlow Object Detection APIhttps://github.com/tensorflow/models/tree/master/research/object_detectionworking on Windows by following the install instructionshttps://...
4
votes
1answer
11k views

OpenCV extract area of an image from a vector of squares

I have an image that contains a square, and I need to extract the area contained in that square.After applying the squares.c script (available in the samples of every OpenCV distribution) I obtain a ...
2
votes
1answer
538 views

OpenCV Object detection tutorial

I'm new to OpenCV platform. I've installed and successfully run some tutorial codes(inbuilt). But I'm facing some issues with the codes involving haarcascade.The code builds perfectly and also the ...
19
votes
3answers
12k views

Detecting object regions in image opencv

We're currently trying to detect the object regions in medical instruments images using the methods available in OpenCV, C++ version. An example image is shown below:Here are the steps we're ...
31
votes
3answers
11k views

How to Detect Physical object in Android Augmented Reality?

I found many ways to detect different shapes. But hard luck when I am going for a physical object. From what I read we should have a black border around images to make a pattern file. If I follow this ...
11
votes
3answers
11k views

HOG for “detecting object” opencv

I would like to know, if there is any code or any good documentation available for implementing HOG features? I tried to read the documentation here but it's quite difficult to understand and it needs ...
10
votes
5answers
1k views

Nothing is being detected in Tensorflow Object detection API

I'm trying to implement Tensorflow object detection API sample. I am following sentdex videos for getting started. The sample code runs perfectly, it also shows the images which are used for testing ...
9
votes
3answers
8k views

Continued - Vehicle License Plate Detection

Continuing from this thread:What are good algorithms for vehicle license plate detection?I've developed my image manipulation techniques to emphasise the license plate as much as possible, and ...
9
votes
2answers
2k views

Rectangle detection / tracking using OpenCV

What I needI'm currently working on an augmented reality kinda game. The controller that the game uses (I'm talking about the physical input device here) is a mono colored, rectangluar pice of paper....
7
votes
0answers
1k views

How to get existing model to recognize additional classes?

Thanks to Google, that it provided few pre-trained models with tensorflow API.I would like to know how to retrain a pre-trained model available from the above repository, by adding new classes to ...
4
votes
1answer
2k views

Retrain Tensorflow Object detection API

I have read tutorials on how to train a new class using TensorFlow Object Detection API. But what I want to do is to add a new class to the already trained classes of a pre-trained model. For ...
1
vote
1answer
2k views

Detect square using opencv2.4

i used a program to detect square in an image. that is working well with the image that i download from the internet. but what should i do is detect squares of the image which is taken from a camera. ...
12
votes
2answers
3k views

How to categorize True Negatives in sliding window object detection?

I'm gathering results from my image detector algorithm. So basically what I do is that, from a set of images (with the size of 320 x 480), I would run a sliding window of 64x128 thru it, and also ...
3
votes
1answer
23k views

Simple OpenCV project - detecting and tracking a tennis ball

I have a project where I need to use OpenCV to detect an object (Tennis Ball) on a webcam, and for bonus credit, track it when I roll it across the table.I haven't had much luck finding info on this,...
3
votes
1answer
17k views

How to detect and match a marker using OpenCV (Template Matching)

I am using an image which holds a marker in a specific area. I tried to do it using Template matching which is the method defined in opencv as cvMatchTemplate. I am using a web cam to detect them, ...
2
votes
0answers
550 views

TF Object Detection API - Not ALL classes are being detected & behaving oddly

Setup:ubuntu 16.04 LTS, 4 vCPU + 30gb ram nvidia K80 GPU w/12gb memoryCUDNN 8.0 x64 TF version 1.3Objective: using TF object detection API to detect face, person, pistol, rifle, automatic_rifle ...
3
votes
1answer
23k views

matchTemplate finding good match

Hi I use this answer and write my own program, but I have specific problem. If there is not the object, matchTemplate do not gives an error, and I do not know any method to check if matchTemplate find ...
3
votes
1answer
4k views

How to detect white blobs using OpenCV

I paint a picture to test:And I want to know how much blobs I have in the black circle and what is the size of each blobs (all blobs are ~white).For example, in this case I have 12 spots:I know ...
3
votes
1answer
1k views

Store Tensorflow object detection API image output with boxes in CSV format

I am referring to Google's Tensor-Flow object detection API. I have successfully trained and tested the objects. My question is after testing I get output image with box drawn around an object, how do ...
3
votes
2answers
2k views

How to perform RCNN object detection on custom dataset?

I'm trying to perform object detection with RCNN on my own dataset following the tutorial on Matlab webpage. Based on the picture below:I'm supposed to put image paths in the first column and the ...
2
votes
1answer
777 views

Training with big class imbalance

This is a three part question 1) Class size - i'm training the TF object detection API on 5 classes, where sizes aren't anywhere close to each other:No. of images in class1: 401No. of images in ...
6
votes
1answer
410 views

HoG features for blocks only

I am trying to calculate HOG features for block only. I explored hog.cpp listed under opencv/module/gpu/src/. Below is the code that I change to computer the features of block only.void cv::gpu::...
3
votes
1answer
222 views

How to get well-defined edges regardless of the color

I am trying to develop an App that detects cards "master cards, visa, cutomer cards, etc" using Android Camera, for that purpose i used OpenCV4Android version 3.0.0. To achieve this task, i did the ...
3
votes
1answer
1k views

How to get a position of custom object on image using vision recognition api

I know there is a lot of vision recognition APIs such as Clarifai, Watson, Google Cloud Vision, Microsoft Cognitive Services which provide recognition of image content. The response of these services ...
2
votes
1answer
4k views

Create PASCAL Voc for Tensorflow Object Detection API

This question is an extension of this one.TLDR;I'm trying to train the TS Object Detection API using my own dataset. For proof of concept, I decided to adhere my dataset to the Pascal VOC 2012 ...
2
votes
4answers
1k views

Tensorflow Object Detection Training Killed, Resource starvation?

This question has partially been asked here and here with no follow-ups, so maybe this is not the venue to ask this question, but I've figured out a little more information that I'm hoping might get ...
1
vote
2answers
1k views

Random object detection matlab

I want generate a random image using matlab which contains the object to be detected and the clutter images at random locations. I then want to detect this randomly generated object under the clutter ...
0
votes
2answers
418 views

How to create a class for non classified object in tensorflow?

Hi i have build my CNN with two classes dogs and cats, i have trained this and now i am able to classify dog and cat image. But what about if i want to introduce a class for new unclassified object? ...
27
votes
3answers
1k views

In a digital photo, how can I detect if a mountain is obscured by clouds?

The problemI have a collection of digital photos of a mountain in Japan. However the mountain is often obscured by clouds or fog.What techniques can I use to detect that the mountain is visible in ...
18
votes
1answer
7k views

What are possible values for data_augmentation_options in the TensorFlow Object Detection pipeline configuration?

I have successfully trained an object detection model with TensorFlow with the sample configurations given here: https://github.com/tensorflow/models/tree/master/object_detection/samples/configsNow ...

153050per page
angop.ao, elkhabar.com, noa.al, afghanpaper.com, bbc.com, time.com, cdc.gov, nih.gov, xnxx.com, github.com,