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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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Relocalize a smartphone on a preloaded point cloud

Being a novice I need an advice how to solve the following problem. Say, with photogrammetry I have obtained a point cloud of the part of my room. Then I upload this point cloud to an android phone and I want it to track its camera pose relatively…
Sophour
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Python Opencv 'numpy.ndarray' object has no attribute 'iteritems'

Recently I have been working on an object recognizer. Some of the code written below is copied. When I ran the code I got this weird error:AttributeError: 'numpy.ndarray' object has no attribute 'iteritems' that I could not fix. I looked on the…
user8396116
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Vuforia Unity - Tracking simple 3D shapes

Currently, I know that Vuforia can track objects that are scanned in the targets database. This means that if I wanted to recognize many objects, I have to scan each of them and upload them into the database. Here’s what I want to create. I want to…
Jsbbvk
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image classification using pre-trained caffe-model

I'm doing a project on image classification using pre trained caffe model, in visual studio, openCV3.4.0, C++. I'm facing with some errors: readNet:Identifier not found blobFromImage:function does not take 7 arguments I copied the code from…
Sanjay Kumar
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How to display the data as augmented only if the user is facing towards a feature in the real world?

I am currently developing an augmented reality android application in which I would like to display the discharge data of a river along with the river name as augmented features. However, I would like to show the data augmented only if an user is…
Charu Manivannan
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Transfer learning with Tensorflow ssd_mobilenet_v1_android_export.pb model

I would like to make TF Detect, one of the Tensorflow Android demo apps, recognize only a restricted custom set of objects (say apples, pears, oranges and bananas) in camera frames, drawing boxes around recognized objects. Following the…
eca
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how to know what are the possible output for the object recognition machine learning model (CoreML)

The Machine Learning Model I download from Apple's website, can be used to recognise lots of different object through image. I want to know, say I need to detect all different kinds of trees. Some can be recognised by the model whereas some cannot.…
Tony Lin
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License plate horizontal location

A horizontal projection profile is defined as the vector of the sums of the pixel intensities over each row. The image below shows a graph representation of the horizontal projection of the edge image, where the peaks of the graph indicate regions…
kogami2012
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Object Detection In Image

I have one image for example bussiness card like this Than I have multiple images that this bussiness is inside there for example or this one I need to detect that bussiness card in those two tables and get position (x-y) of object and also…
G.L
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TensorFlow: Collecting my own training data set & Using that training dataset to find the location of object

I'm trying to collect my own training data set for the image detection (Recognition, yet). Right now, I have 4 classes and 750 images for each. Each images are just regular images of the each classes; however, some of images are blur or contain…
user3779940
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How to find the people who are not wearing helmet

I know how to using image detection to find whether there is helmet or not in the picture, but I don't know how to find whether there is someone without wearing helmet, especially when there is another wearing helmet in the picture. Would you please…
Sekiichi
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How to detect test strips with OpenCV?

I'm a newbie to computer vision, and I'm trying to detect all the test strips in this image: The result I'm trying to get: I assume it should be very easy, because all the target objects are in rectangular shape and have a fixed aspect ratio. But…
zhengyue
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How to find the area of only garbage collected in sea using SIFT algorithm in matlab?

I have used SIFT to locate keypoints in some garbage part collected in ocean. How can i automatically calculate area of all garbage only? In the given figure blue points are the keypoints formed through SIFT algorithm. I'm new to matlab. Original…
Sanjay Roka
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why is homography needed in object recognition problems?

I have been asked to do sift key-point matching and then homography matrix estimation. Why do i need the homography matrix in object recognition problems? This is the kind of images I am trying to recognise1
wannabegeek
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Float32MultiArray - Reading the [1, 1] in a matrix

Hello I am subscribing to a topic, where another node publishes Float32MultiArrays to it. This multiarray has information about objects I detect through a camera, this means that the first number in the matrix is a ID of the object and the other…
giggitygoat
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