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Questions tagged [opencv]

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computer vision raspberry pi

Would anyone know what a good 'side view' person detection algorithm that raspberry pi can handle? I am utilizing haar cascades to create a region of interest and I can get the ...
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Approximate Median Filter for background subtraction

I want to know how can I subtract background of a video using Median filter, I need some examples in opencv and python.
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1answer
84 views

how to apply similarity algorithm(or comparision) of over one million vectors with other one million vectors?

how to apply similarity algorithm(or comparison) of over one million vectors with other one million vectors Please help I am a beginner in this field I am following this pyimage search tutorial but ...
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How to compile OpenCV 2.4 with CUDA10

I have a RTX2070 so I can only use CUDA10. But I am working on this project which needs OpenCV 2.4. How I can install OpenCV 2.4 for CUDA10? I already tried this, but since the instructions are for ...
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1answer
26 views

Uniformity of color and texture in an image

I am new to the field of deep learning and have a problem in determining whether two images have uniform color and texture. For example, I have a Master image - Now, with respect to this image i ...
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How to classifying/Identify both cat and dog image in a single image?

I have trained cat and dog images and testing them using CNN model with python. .. Ok..! But I have one image in which both cat and dog present ... . Now question is how to make label cat and label ...
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0answers
9 views

HoG feature detector

I need to implement a keypoint matching using HoG descriptor, my first question: is it possible detect keypoint with HoG in opencv? If not, for example if I use SIFT keypoint detector how can I ...
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23 views

FREAK feature extraction OpenCV

I want to know how to use FREAK feature extraction in python, I read the documentation but I need some examples. I wrote this code : ...
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128 views

i got the following error : 'numpy.ndarray' object has no attribute 'detectMultiScale' to show image in python?

import cv2 videoCam = cv2.VideoCapture(0) face = cv2.CascadeClassifier('haarcascade_frontalface_default.xml') eye = cv2.CascadeClassifier('haarcascade_eye.xml') nose = cv2.CascadeClassifier('...
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1answer
40 views

Keypoint matching using HoG and SIFT

I have two images and I've found their keypoints using sift keypoint detector, Now I have to match their keypoints with HoG features, I know how to extract HoG description, but I dont know how to ...
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0answers
22 views

Recognize polygons and get coordinates on transparent image

I have to implement a program to recognize polygons on transparent images, like this: So, in this picture we have 4 main polygons, we need to recognize them with a blue background and more dark blue ...
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2answers
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Classifier not predicting real data

I'm trying to train a classifier to recognize my own signature. This is how I built my classifier How did I collect data? Signed on a piece of paper for 50 times and created 50 images out of it. for ...
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1answer
26 views

Opencv kmeans predict equivalent

I'm moving my project from Python's libraries to opencv, and I have one big problem. In Python skylearn, I have kmeans object, which has two useful methods: fit_predict and fit, which both are ...
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Image processing algorithm [closed]

Can you give me a idea about image processing segmentation algorithm invariant to light that can be implemented in Opencv in Jupyter Notebook?Please!
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1answer
44 views

Bounding box coordinates prediction

How to pass multiple bounding boxes coordinates to CNN model?My goal is to predict the coordinates of texts in an image.
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How to get more than one bounding box value from a single segmented-image for a given value?

I am trying to fetch all the bounnding boxes values for a given segmented-image for a particular value. For example: I have a single semantic-segmented image which contains pedestrians, van, car, ...
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1answer
82 views

Is it possible to detect the person using face recognition on the fly?

I am building a small app for face detection in python using face_recognition and opencv ...