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Questions tagged [opencv]

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4
votes
2answers
646 views

Why image is more blurred through PIL?

I was using PIL library to open an image and then convert it into array later on for DL operations. However I found out that image opened was blurry as opposed to the original image. Why is the image ...
7
votes
2answers
6k 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 ...
3
votes
1answer
227 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, ...
4
votes
1answer
1k views

Identify credit card shape using machine learning

I have to approach this task: identify credit card from an image. I am attaching example image below: I have to identify and localize the credit card from this image. The real challenge is that the ...
0
votes
1answer
116 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 ?
1
vote
2answers
26k 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
402 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 ...
1
vote
0answers
301 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. ...
5
votes
2answers
839 views

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

How can I apply similarity algorithm (or comparison) of over one million vectors with another one million vectors? I am following this pyimage search tutorial but don't know how to scale up the ...
1
vote
1answer
1k 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 ...
5
votes
1answer
698 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
vote
1answer
1k 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
80 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 ...
1
vote
2answers
34 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
238 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
68 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
493 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
2answers
551 views

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

I am working on a small app for face detection in Python using face_recognition and opencv libraries. I have trained the data ...

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