Questions tagged [object-recognition]
The object-recognition tag has no usage guidance.
92
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How to detect faint, dense grains on an image?
I have a bunch of images similar to the following:
As you can see, there are faint grains in a roughly ellipse-shaped area, along with a few bright ones. I need to identify the location and density ...
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31
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Object detection only when a particular type of object is on the image
Apologies if this has been answered already.
I am very new to computer vision. I am kind of familiar with object detection and classification for many types of classes, which involves training data ...
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52
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Recognizing bees in a beehive
I would like to know if image recognition software would be sophisticated enough to recognize reach single bee in a bee hive separately (for the purpose of tracking it, and tracking, and accounting, ...
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6
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3k
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Algorithm for Scale Invariant Template Matching
I am using opencv for finding template images in a video stream. The elements I am trying to find are UI elements of android apps.
Classic template matching is working quite well. But only as long as ...
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45
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How to distinguish the same object entering the camera field of view
We want to set photo cameras in the field and capture images of insects that visit flowers. We want to place these cameras above the flowers and then they should get triggered whenever an insect lands ...
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Feature extraction for IRIS recognition
What are types for feature extraction in iris recognition? How can I divide it on types which detect phase, edge, etc.?
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204
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Easiest Pattern to Recognize with Machine Vision
I need to detect the exact position of some kitchen tools using machine vision. I've the possibility to label the tools with a pattern, to make the detection (more specifically the image segmentation) ...
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718
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Detect non rectangular bounding box for objects
I have a short video where a TV is shown. I need to detect the TV there (let's assume it's all pure black or it's covered with a green screen), and overlay a video on top of it on the same area. But ...
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93
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Remove noise from VGA image
I have 2 color images generated from same X-ray machines, but one of the image is obtained using VGA cable. Therefore the RGB intensities differ in the 2 images. I am using Object detection to detect ...
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247
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Algorithm for smoothing the output of an object detector operating on a video?
Please could you point me towards an algorithm that takes a series of object detections performed on a frame by frame basis as input and outputs a filtered series of object detections in which the ...
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63
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SSD object detection - Class score and bbox coordinates computing
How does SSD ( single shot multibox )object detection model computes the the confidence score and the bounding box coordinates, referring to SSD paper, it said that this process is done with the aid ...
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201
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How to resize a Summed Area Table/Integral Image?
There is very clear explanation on how a Summed Area Table/Integral Image works here:
https://uk.mathworks.com/help/vision/ref/integralimage.html
How to you scale this SAT/Integral Image?
For ...
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603
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Red Blood Cell Color Image Segmentation
I want to segment this Red Blood Cell Image on HSI color space.I want to try the Otsu Method but from what I read that method work only on Grayscale image.Do you have any suggestion for suitable image ...
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353
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How to use optical character recognition program to read coins? [closed]
I had a friend that goes through my pennies trying to find valuable rare pennies. Instead of looking at each one could a optical character recognition program be used to flag coins?
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3k
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How to recognize speech bubbles in comic strips (Ideally OpenCV)
I need to recognize speech bubbles to send to OCR and also to know where they are in the strip.
How could I do this with OpenCV?
I'm using OpenCV 2 and Python 3.6
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208
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Techniques for recognizing white rectangular labels in these pictures? (Ideally OpenCV)
I need to recognize these two types of labels.
zBar does recognize some of the barcodes sometimes, but I'd need to catch the ones that it doesn't and detect the label, so I can try and straighten up ...
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152
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Haar Training with object Blacked out in Negative Samples
I am wondering if there is any downside to blacking out the target object when it appears in negative samples during Haar Cascades training.
Basically, If i want to detect a human nose. Can I just ...
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245
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Video processing to detect a logo in frames
I am trying to detect a TV channel logo inside a video file, so simply given an input .mp4 video, detect if it has that logo present in all (or most) of frames or not (or maybe what percentage of ...
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Improving Template Matching Algorithm for OpenCV
Car detection using OpenCV
I am working on a small personal project where i have to know wether an image shown is a car or not. I am using the basic OpenCV python based template matching.
Positive ...
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343
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Pattern matching methods: Based on Area and Based on features
Good morning, I'm new to image processing and I'm currently working on a project for pattern matching and OCR more specifically.
In the state of art I've found the matching process can be classified ...
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458
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Algo Name: Detecting Elongated Shape in 2D Image by Convolution with Directed Lines
I am detecting a shape with roughly known orientation (obtained by using Hough line transform) in thresholded binary image by convolving the image with line with that orientation, and counting the ...
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Is image processing impacted by the lens or sensor size of the camera?
We want to configure a system for detecting and tracking basketball shots made. We have control over the cameras, so we can choose anything from a smartphone to a GoPro.
Assume the scene is a typical ...
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1k
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Multi-scale in Object detection?
I want to ask about MultiScale Object Detection. For the multiscale, if we have an original image do I need to zoom-in at different scales in the image at a particular point or zoom-out at different ...
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420
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How to recognize an object from a small training set of images?
Given a small training set of images (say, around 6 max) of the same object, how to measure how likely is another query image to contain the given object?
The training images are "clean", i.e. only ...
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976
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Summed-area table vs Integral image?
I have been going through few research papers around face recognition and I came across two texture extraction algorithms :
Summed-area table by Crow et al. ("Summed-area tables for texture mapping",...
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262
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Can I use standard computer vision techniques for images taken in the NIR spectral range?
I'm relatively new in Computer Vision and I need some advice with respect to the general possibilities and shortcomings of images taken in the near infrared (NIR) range. I passed a great deal of time ...
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72
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Detecting objects in real world video feed?
I have an image which consists on an object in a plain black background. This is the reference image of the object. Now, My task is to take a webcam and obtain the video feed and I have to detect if ...
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looking for simplified version of motion capture for simplified situation where objects are solid and have no joint (no internal degree of freedom)
The whole question is about a simplified algorithm for tracking a single solid object which has no joint, with assumption that i have full control on adding some markers in real world to it.
For ...
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1k
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Removing Noise from Dental Radiography
I'm working on a project of applying Active Shape Model to locate tooth in dental radiograph. For those familiar with the technique, I'm currently trying to sample along normal vectors for each ...
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630
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Best reference for object size estimation in an image
I'm working on a project where I need to measure the size of a 2D object on a flat surface from an image. I have total freedom to create a reference with any shape and size.
The camera I am using is ...
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How to find a noisy line in a picture
Hi I would like to find a line in a noisy image as showed bellow. I tried gabor filter and cany edge detection, but it didn't produce anything usefull. I am looking for lines of specific orientation ...
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How does the PASCAL VOC challenge evaluate the task of object detection?
I fail to understand the evaluation parameters like true positive, false positive and false negative in detection and classification tasks.
can anyone help me to figure out what does each of these ...
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2
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How to verify if two images have the same object/content?
I am truly new to computer vision field, but it is fascinating me! I have now a challenge in my hands and I am seeking for mentors/advisers to give me some follow up.
My project is: From a picture of ...
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118
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Object detection using several images
how do people combine different information (e.g., RGB and depth image or RGB and thermal image) to make their object detection algorithms better?
If the single modality images A and B are perfectly ...
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383
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ImageJ Object Detection within AVI Stack
I am working on a project in which I am attempting to analyze a fish within a petri dish using ImageJ and an AVI clip of the fish under a microscope. My first hurdle is to locate the fish within the ...
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90
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Object detection algorithm
I need detect object in series of pictures. This object has something like nonsymetric relief structure with some irregularities. In this conditions.
Light conditions can change from almost dark to ...
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How to calculate performance of your object recognition algorithm and compare results with others?
I am working on a novel object recognition algorithm with BoF implementation for my MSc project and it performs fairly well. I am using it on Caltech101 dataset. I want to compare the results with ...
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How to use ImageNet Database in Matlab [closed]
How to use ImageNet Database in Matlab for object classification or recognition? I didn't find any tutorial which could practically tell me how to train images on ImageNet database and classify the ...
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KLT tracker implementation
I'm working on a object tracker based on KLT algorithm using matlab.
Can anybody guide me how I can find the features and calculate the distance in the sequence of the frames?
Thanks.
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Machine Vision Techniques for Sign Language Recognition and Interpretation(using Matlab)
I'm currently working on applying Machine Vision methods to sign language interpretation and I'm really overwhelmed with the body of knowledge out there. I've been reading up on object recognition ...
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How to implement HOG with trilinear interpolation by Matlab?
I am studying HOG. I have find the code code1 and code2 about HOG. However, both of them don't implement trilinear interpolation. I have also read some websites, including web1 and web2. I still don't ...
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239
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How do I deal with occlusion, warping, or perspective distortion for object detection
I am using SIFT features for detecting logos in clothes. SIFT is quite powerful, as it is scale invariant, but how do I deal with the problem of occlusion and warping?
More specifically, the logos in ...
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2
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736
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What is the ideal type of barcode for paper tickets?
I can use the following type of barcodes in my project:
Code 39
Code 128
QR Code
Data Matrix
PDF-417
They will be printed with standard office printers and with boca printers. It should also be ...
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Object Detection Algorithms
I'm a complete beginner to object recognition.
I need to identify and count how many of a certain type of Lego, in a picture full of different pieces of Lego, using MATLAB.
The pieces of Lego I need ...
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Why optical flow ? why not tracking
I have a question that might be stupide !
Supposing that I try to detect object moving in a video or human action.
Many works are based on optical flow computation.
My question is why using OF is ...
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Head detection using HOG and SVM
I am currently trying to detect heads in a sequence of real-footage images and am using HOG feature descriptor and SVM as classifier.
Currently I am using Dalal's HOG implementation code in MATLAB ...
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Pyramid Match Kernel: How to fit grid around data points?
I am planning to use Pyramid Match Kernel method for object recognition from depth images: I am going to extract a set of feature vectors $x \in \mathbb{R}^d$ for each object instance and then I want ...
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AGAST vs FAST evaluation
In ~2006 the FAST corner detector was introduced. One of it characteristics is that you have to train a decision tree from some test image in order to learn the types of corners present and relevant ...
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Rectangle detection in "real life" images
I have seen a lot of posts here and on SO and on various websites, using Matlab, OpenCV, name it, on how to detect rectangles in an image. I have done it myself too, using Matlab. My usual steps were:
...
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How to constrain the object detection problem?
How to constrain the object detection problem?
It would be tempting to ask for precision such as: "It depends, does it have to be viewpoint invariant, is there going to be viewpoint changes, etc.?" ...
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