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Questions tagged [vision]

Methods to acquire, analyze and understand images using mathematical approaches.

664 questions
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Captured image viewpoint changing

i have a picture that captured from a fixed position [X Y Z] and angle [Pitch Yaw Roll] and a focal length of F (i think this information is called camera matrix) i want to change the captured picture to a different position like it was taken in…
mefmef
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OpenCV: Using cvGoodFeaturesToTrack with C++ mat variable

I am trying to use the cvGoodFeatureToTrack function in Visual Studio 2010 with the image type as Mat. Most of the examples I have seen use the IplImage pointer. Right now I have this: int w, h; // video frame size Mat grayFrame; Mat eigImage; Mat…
Inderpreet Singh
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Detect if page is in frame of webcam

I want to scan some documents and I want to know when a page is "in the frame" of the camera. What I mean by this is the optimal distance from camera to page document (but without cutting any of the document). I want to run the detection program in…
John Kornick
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How can Vision be used to identify visible face landmarks?

I've been using Vision to identify Facial Landmarks, using VNDetectFaceLandmarksRequest. It seems that whenever a face is detected, the resulting VNFaceObservation will always contain all the possible landmarks, and have positions for all of them.…
ElFitz
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Does labelled data need to be marked as verified for YOLOv5

I have a labelled dataset that I haven't exported yet. I can flag each image as verified. But do I need to do this or is it optional? I saw this option sync across several labelling software. I've mostly labelled the dataset but I am scared that the…
sjhsadgjhgsgajkhgfdsaj
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Is there a differentiable algorithm for image quantization?

I am implementing an autoencoder, used to rebuild color images. The loss function I want to use requires a reduced color set (max ~100 different colors) but I am struggling to find a suitable differentiable algorithm. Another doubt I have is the…
Simone Berasi
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Read and extract keypoints from folder of videos opencv

I have a list of videos (10 sec each) in a folder and I'm trying to loop through each action video to extract keypoints and save them as json files. path = "path to video folder" for file in os.listdir(path): cap = cv2.VideoCapture(path+file) …
hishan lu
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Python, calculate histogram of an HSV image, ignoring the background

I'm trying to compute the histogram of an HSV image with openCV, with the following code: def istogrammaHSV(image,histSize): hsv_planes= cv2.split(image) histSize= histSize histRange= (0,256) accumulate=False h_hist =…
Mario Turco
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Aligning similar images with selected area from reference image

I have 4 taken photo same object with different angles. And i can play orderly on imageview like gif. But i noticed i need to align (focus) images on one focus point. Some app can make that, but i cant find solution how can i do. I shared example…
Vileriu
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Reading files with .h5 format and using it in dataset

I have two folders( one for train and one for test) and each one has around 10 files in h5 format. I want to read them and use them in a dataset. I have a function to read them, but I don't know how I can use it to read the file in my class. def…
Aysan
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IndexError: list index out of range use google vision

import io import os os.environ["GOOGLE_APPLICATION_CREDENTIALS"]="future-shuttle-323208-1e6aebdb018d.json" # Imports the Google Cloud client library from google.cloud import vision from PIL import Image import cv2 write1=[] write2=[] for i…
陳昱廷
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Create patches from 3d images for training

I have (320x1280x1280) 320 image slices. I want to train network but have limited data, For this i need to create image patches from original images so that i can effectively train the network. How i can do it in python? and what could be any other…
Ali
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Putting loading animation over VNDocumentViewController Swift

Is it possible to put a loading animation over the VNDocumentViewController? As in, when the user presses the Save button, is there a way for me to somehow indicate that the Vision is processing the image and hasn't frozen? Right now, in my app,…
rice888
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CIDetector to detect any objects bounding box

Imagine having an array of images like these Background is always white(even in the 3rd pic, main object there is that big brown rectangle with shapes inside) No matter of given type of the image you would need to: 1) find main object boundary…
Farkhad Gojazadeh
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What libraries can adjust exposure with Opencv?

I'm trying to adjust the exposure of a Microsoft LifeCam HD 3000 with Opencv3, but (CV_CAP_PROP_GAIN, value from 0 to 1) it has does not work. Are there any other libraries that work with Opencv to adjust the exposure of a camera?
MZP
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