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Questions tagged [opencv]

The tag has no usage guidance.

-2
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1answer
12 views

Extract tabular data to excel [on hold]

I need to extract tabular data from a PDF to excel. Can anyone let me know if there is any tools or libraries for this purpose?
4
votes
1answer
59 views

How can I detect blocks of text from scanned document images

ORIGINAL IMAGE: GOAL: I want to separate texts into individual paragraphs by placing bounding boxes over them (as shown above). I tried it do this via traditional computer vision approach using ...
1
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0answers
12 views

How can I detect partially obscured objects using Python?

I'm building a computer vision application using Python (OpenCV, keras-retinanet, tensorflow) which requires detecting an object and then counting how many objects are behind that front object. So, ...
2
votes
1answer
56 views

Identify credit card shape using machine learning

I have to approach this task : identify credit card from a image. I am attaching example image below I have to identify and localize credit card from this image. The real challenge is that the card ...
0
votes
1answer
23 views

does tensorflow use opencv to covert image to numpy array

Does tensorflow use opencv to covert image to numpy array ? How is feature extraction done in tensorflow ? How is it different from opencv model ?
0
votes
0answers
38 views

Images similarity using SIFT and Annoy

Given an image, I need to get the most similar ones with "score" or percent of similarity I'm using SIFT to get the descriptors from all the images and storing them in Annoy as individual vectors ...
0
votes
1answer
196 views

cv2.error: OpenCV(3.4.3) (-215:Assertion failed) !empty() in function

Would anyone have a tip on how to fix this empty function error in OpenCV? I am attempting to follow the guides on OpenCV.org The script will detect a face in an image and draw boxes around ...
0
votes
1answer
31 views

Calculate image width

In this code below, a picture can be loaded into openCV and then the region of interest RIO can be created by just selecting a box around something with the mouse, then press ...
0
votes
0answers
26 views

openCV tracking algorith & Haar Cascades

(long question sorry) This script below will utilize my windows 10 laptop webcam detect faces with haar cascades and calculate the centroid of what ever is captured. Besides OpenCV I also use the ...
1
vote
0answers
26 views

Detecting blinking light on a device

Can anyone tell me good approaches to detect blinking light in a video? The background may change constantly. As of now, the color would remain same but the intensity and angle of vision can change. ...
0
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0answers
35 views

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.
3
votes
1answer
105 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 ...
0
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0answers
56 views

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 ...
0
votes
1answer
111 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 ...
0
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0answers
24 views

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 ...
-1
votes
0answers
13 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 ...
2
votes
0answers
72 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 : ...
1
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0answers
572 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('...
1
vote
1answer
154 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 ...
1
vote
0answers
28 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 ...
0
votes
2answers
19 views

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 ...
0
votes
1answer
54 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 ...
1
vote
0answers
42 views

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!
0
votes
1answer
251 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.
1
vote
1answer
215 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 ...