Questions tagged [computer-vision]
Use this tag for questions related to Computer Vision -- any aspect of software that enables computers to perceive, understand and react to their environment using cameras. For questions related to image filtering and quantification, use the tag [image-processing] instead.
computer-vision
6,242
questions with no upvoted or accepted answers
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answer
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LSTM object detection tensorflow
Long story short:
How to prepare data for lstm object detection retraining of the tensorflow master github implementation.
Long story:
Hi all,
I recently found implementation a lstm object ...
- 169
15
votes
2
answers
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Why is the Vision framework unable to align two images?
I'm trying to take two images using the camera, and align them using the iOS Vision framework:
func align(firstImage: CIImage, secondImage: CIImage) {
let request = ...
- 4,958
11
votes
0
answers
630
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Jointly training custom model with Tensorflow Object Detection API
I am trying to use Tensorflow object detection API models in another custom model I built (in the same codebase). Specifically, I am trying to figure out how below can be handled (mutually exclusive ...
- 73.1k
9
votes
0
answers
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Embed custom meta-data (bounding boxes) into HLS video stream
I'd like to embed bounding boxes, labels, etc. into live video stream to optionally draw them thereafter on the client-side in web-browser and looking for a way how to do.
Could you please give me a ...
9
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0
answers
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attempt to convert SSE2 Fast Corner score code to ARM Neon
I was trying to port some SSE2 code (fast corner detector score computation) using ARM Neon instruction. The code is quite simple at first sight but the results are different for some reason. The ...
- 339
8
votes
0
answers
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Stereo Camera calibration using different camera types
I'm trying to perform stereo camera calibration, rectification and disparity map generation. It's working fine with normal sample data. However, I'm trying to use the dual cameras on an iPhone 7+, ...
- 2,931
8
votes
2
answers
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how to improve keypoints detection and matching
I have been working a self project in image processing and robotics where instead robot as usual detecting colors and picking out the object, it tries to detect the holes(resembling different polygons)...
- 133
7
votes
0
answers
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Inconsistent Intrinsic Parameters in Stereo Camera Calibration Using ChAruco Board
I am calibrating a stereo system using a ChAruco board, chosen due to the short focus distances of the cameras in my setup, which prevent me from capturing an entire classic chessboard grid on both ...
- 164
7
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OpenCV Python solvePnP's EPnP implementation not producing the same output as official MATLAB EPnP implementation
these days I am working on understanding the solvePnP algorithm used for computer vision. I found the official EPnP algorithm in MATLAB here https://github.com/cvlab-epfl/EPnP.
I am comparing the ...
- 385
7
votes
0
answers
517
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How to calculate text to background color from an image?
First let me say that I am starting the journey with computer vision so I would be grateful for any idea!
What I need to do is to calculate the contrast between a text and a background on an image.
I ...
- 81
7
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0
answers
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How to extract text with math symbols using pytesseract/tesseract version 4.0 (using equ.traineddata). 'equ' is no longer supported
How can I use the tesseract to extract the mathematical equation?
While reading the image given below:
after using:
img = cv2.imread(IN_PATH+'sample1.png')
pytesseract.image_to_string(img)
I get ...
- 4,032
7
votes
1
answer
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OpenCV hough lines vs scikit-image
I've been comparing OpenCV and scikit-image's hough lines implementation and I'm finding that scikit-image gives significantly better results. I'm trying to do the same canny/hough lines transform in ...
- 16.5k
7
votes
0
answers
477
views
How much can openCV.js be reduced to improve loading time?
I'm working on a web based AR project, and rely on openCV for most image processing tasks. I only use functions of the "core" and "image processing" modules, so I'd like to compile a minimum version ...
- 81
7
votes
1
answer
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How to reverse the operation of torch.nn.functional.grid_sample?
If we get two images, target image tgt_img and source image src_img. And, we also know the grid grid from source image to target image. Thus, we can use the F.grid_sample to generate target image from ...
- 101
7
votes
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How to manually set exposure on a Facetime HD camera in Python opencv 3.2.0 OSX El Capitan
I am trying to figure out how to manually set the exposure for my Facetime HD camera in the opencv program I am writing in Python. I am using opencv version 3.2.0, python 2.7, and running on OSX El ...
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