Questions tagged [opencv]

Open Source Computer Vision Library (OpenCV) is an open source machine learning library used primarily for computer visions applications. OpenCV contains over 2,500 optimized algorithms (including state of the art computer vision ones).

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error: (-215:Assertion failed) [closed]

I was testing OpenCV with their code provided within the documentation. Unfortunately, I'm facing an unexpected error. I think, it might be due to the newer version that I've. I've tried the fix of ...
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Object Detection, custom dataset, algorithm [closed]

I'm looking for a solution to detect objects and classify them, using a custom dataset.The overall goal is to detcet objects using my webcam. So far I've wanted to use YOLO in combination with OpenCV, ...
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How to draw a line on video frames using opencv?

I have following code for object tracking and have x and y coordinates in a dataframe for a few frames of the video. I would like to draw a line using these coordinates so that my output looks like ...
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17 views

measure the tracking error on object detection algorithms?

I have done object detection on my video data using trackers such as CSRT, KCF and got the detection part.I have ground truth coordinates (x,y) values for few frames from the original video which ...
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how to make image classification model to detect object and track object in a video

i have built a disaster classification model . now i want to use this classification model to detect ex- cyclone in a video to draw bounding box around it and track the cyclone if possible.is it ...
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1answer
14 views

OpenCV2 resizing image: recommended size [closed]

I am working on image processing project. I see that it's recommended to resize the image in the data pre processing step. How do I decide what size to to resize it to? The tutorial I am following ...
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1answer
30 views

Detection of a specific shape in an image

I want to create an algorithm in order to detect the following shape (in the blue region) in videos or images: I have no dataset from the corresponding object so I thought that if I define it ...
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1answer
14 views

How to convert the image into frontal?

I have to complete the project in which I have to apply some techniques or model to images . My aim is to convert the image to frontal/straight when it comes to skewed , sheared or any transformation. ...
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Why do images in Open CV template matching get matched to the templates more than once?

The following code reads the set of input tiff files under tiffile and template tiff files under files and performs template matching on them. After the image gets matched, opencv contour extracts the ...
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Which library is better to go with for text recognition(CNN+RNN+CTC), OpenCV vs Keras vs Tensorflow?

I want to build a model to recognize text form images, for this purpose I need CNN stacked with Bidirectional LSTM and CTC. I would like to know which library would be better and how?
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Detection of vortex and numbering on basis of rotation

Problem Statement: I have a video of ANSYS Simulation of vortices formed due to flat plate plunging. The video contains vortices (in simpler terms blobs), which are distinguished according to their ...
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16 views

Why does model CNN with high accuracy but give low prediction on handwriting input images?

I'm trying to train the CNN model with the MNIST dataset expand with my own images handwriting, so I have merged them together, ...
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23 views

Is it ok that my computer vision dataset just is loads of frames and images instead of video?

I am new computer vision and I am having a dataset with consecutive frames of videos. I want to ask that is it okay? How will you deal with it to output a video with some detections?
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111 views

Real distance between bounding box centers

Assume that I have a camera pointing in a specific direction. I know the Euclidean distance (Real world distance) of the camera to a fixed point, X (mm). Using ...
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24 views

crop part of image from image, change it and put it same place in original image

I have image (think of image of small plant) with bounding box. For data augmentation I want to rotate (45 degrees) the image (plant) in bounding box, and place it at same place in original image. so ...
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26 views

Using machine learning to find the most similar image that contains another image

As the title states I want to use ml (maybe some kind of CNN autoencoder?) to find the most similar image (I have a list of 10k+ images) within another image. I am currently just using opencv with ...
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169 views

Converting pixel values to temperature OpenCV

I am converting a pixel values to temp (values of a thermal image). But after conversion output image is not except able. Here is my code: ...
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52 views

how to detect bifurcation, trifurcation, and crossover on image with python opencv

how to detect bifurcation, trifurcation, and crossover from the branch point with OpenCV when the input like this Expect output : I'm trying to use binary_hit_or_miss but I don't know how to display ...
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1answer
545 views

ImportError: cannot import name 'cv2' from 'cv2' [closed]

I'm using anaconda and installed OpenCV using conda-forge. conda install -c conda-forge opencv In my notebook I run this line of code ...
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50 views

What is the closest interpolation method to INTER_AREA in KERAS for shrinking images

What is the closest interpolation method to INTER_AREA in Keras from the following: nearest, bilinear, bicubic, hamming, box, lanczos. I always used INTER_AREA for shrinking images but for some reason,...
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1answer
1k views

error in running exe file after changing .py to .exe

I have changed my python code to an .exe file using pyinstaller and anaconda. In my python script ("untitled.py") I import opencv which I have already installed from source using cmake. ...
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31 views

How does the below calculation help to create a PNG from a floating point depth map?

What is the effect of max_val * (depth - depth_min) / (depth_max - depth_min) in the below function? ...
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15 views

Saving the Autoencoder predicted image to a new directory

I trained an autoencoder model in Keras to generate denoised images given noisy images. The predicted images are stored in the "result" directory, with the individual filenames appended with ...
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25 views

object detection algorithm for video

Is there any way to convert the detected object from an object detection algorithm (Mask RCNN in my case) to a white silhouette (while the background has been set to black)? I have commented on the ...
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10 views

How to run inference of 2 deep learning models simultaneously on video?

I want to get inference of 2 models. First model(Runs at 20fps, Pytorch), Second one is a heavier model(Inference time 1 sec, Tensorflow) on webcam feed. The first model would be running on every ...
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21 views

Opencv installation problem

I tried to install opencv using cmake to work with gpu. After installation, I try to confirm installation. So, I open anaconda prompt and python >> then import cv2. However, I got the error of ...
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53 views

Reading data from Twilio video streams

Tl;dr: I would like to read video streams coming from all the participants from this https://tfvideo-5708-dev.twil.io/video.html in python Details: I have a live tutoring website that uses Twilio ...
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518 views

What is the use of applying img_to_array() after cv2.imread()

In a book, I saw the following code to load images from a directory: ...
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1answer
24 views

Object detection stops predicting well according to how I collect the images

On my problem I have to use 4k resolution (3840x2160) to record images and detect qrcodes at the same time. The images I end resizing it to 1920x1080 to save it on disk. The problem is that if I train ...
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1answer
615 views

Where is the rotated angle actually located in fitEllipse method?

Main task: I fit the ellipse using the fitEllipse() method and then I'd like to count the rotation angle between the horizontal axis and the major axis of the ...
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2answers
450 views

Does resizing the image size, reduce the quality of the images in CNN?

I am doing a project for cancer recognition. My data set has hunderds of images but not of equal size. I wanna resize them to the size of the smallest image. But I am wondering do you think using the <...
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490 views

Find missing object(s) in image with a priori knowledge about the missing object(s) (w.r.t base image)

Problem Statement: I am working on developing a method, or borrow/modify/combine existing ones, where given an golden image (reference or base with all expected objects to be present), it is able to ...
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130 views

Difference between two images but in certain region only

I have two images, where i need to find the difference. i can easily did with the help of SSIM function. Now i want to find the difference between two images but only selected region (i want to ignore ...
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1answer
94 views

Cable angle measurement (rotation)

I need to detect the rotation of a cable (degree) in the x-axis with high precision [0.2 (or more) degree detection] from its original state. Detailed description: I have a cable that is set in its ...
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1answer
547 views

Canny edge detection not working on Gaussian blurred images

I am trying to detect edges on this lane image. First blurred the image using Gaussian filter and applied Canny edge detection but it gives only blank image without detecting edges. I have done like ...
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2answers
209 views

Facial recognition on offline images

I want to do facial recognition on wide varieties of images captured at various ages of my family members. Below are some of the questions I have. If a person uses glasses of different types, do I ...
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18 views

Object identifaction with trained CV model

I am rather new to Computer Vision and Neural Networks, but I already build the following setup: I have a robot which crawls through the grass with a live video feed. I build an OpenCV filtering and ...
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1answer
314 views

Distance of a people in an image [closed]

What is the best approach to find the distance of a person/people from camera, using an image?
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92 views

Detect the presence/absense of simple components from a circuit board using object detection

In this case I have a challenge of inspecting a recently mounted product, using computer vision, to detect the absence of any component that I have to check. For this task, I tried the concept of ...
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1answer
74 views

Comparing two images and showing the difference in a new image?

I would like to compare two web pages images using computer vision techniques. Show what are non-unique portions comparing both images. Which part image1 not exist in image2 vice versa.
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27 views

Paragraph extraction from text

I am trying to separate scanned pages of a 3 column book into paragraphs. On the pages there can be images located in an arbitrary location, occupying part of one, two or all three of the columns. ...
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1answer
125 views

What is the origin of YOLO/darknet coordinates

I am aware of that darknet/yolov3 outputs relative coordinates, would the coordinate (0,0) be at the bottom left, or at the top left? I am confused as opencv2 seems to have the ...
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1answer
2k views

Ellipses detecting at the image

I have the following image: I need to get two ellipses which will 'describe' my 'ring'. I have the following code at the moment: ...
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1answer
15 views

Get specific object dimensional position from image

I need to get specific object like logo dimensional position from an image. I checked open-cv, pillow package etc but it does not help to me. Can anyone advice which is the best process to do this? Do ...
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1answer
56 views

White circles extraction from a little darker background

I'm trying to extract three white circles on the top left corner from the image below: I've tried to use: ...
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1answer
566 views

How to create a model to recognize matching label and ROI with OCR

I am trying to make a model in python using Tensorflow to process the Tesseract OCR to detecting and extracting particular ROI from Image. I want to recognize the particular fields and values from ...
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82 views

Improve results of image stitching using OpenCV (material science)

I'm trying to improve image stitching results with a series of pictures taken via microscope. The object I've photographed is a 3D printed cube that has a number of repeating shapes on the surface. ...
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398 views

Difference detection between two images

I am trying to compare two images and detect the difference between them whether in shape or color. -The change in shape: the number of parts has changed ( increased or decreased). -The change in ...
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26 views

how to update a face recongition ( e.g facenet)

I'm searching for a face recognition that detects new faces not just faces getting from the datasets, for example, facenet is a project that can detect and recognize a face from labels. I would like ...