Questions tagged [image-processing]

Anything related to digital image processing, i.e. the theory and the techniques used to extract or manipulate information from digital images.

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Extraction of features of soil through image processing in python

I am currently working on computer vision and image processing.I am trying to take some images of soil and comment on the type and fertility of the soil.I want to extract some features(like pH level,...
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How to analyse/calculate circumference of human body parts from point cloud or 3d objects?

I am using win10, python and c#. I want to calculate circumference of human parts (belly, biceps etc) with using point cloud or 3d scans like .stl .obj .ply. Now I can get the point cloud of human ...
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16 views

Negative Values of Sobel Gradient Values

First of all, sorry for my bad English.. I've try to create an Image Processing Program with Twelve Directional Feature Extraction (from this url source https://www.ijcaonline.org/journal/number3/...
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1answer
20 views

Detecting trash from aerial photographs of parks?

I'm currently working on a project which requires the use of a drone to detect trash in a park. However, my background in machine learning/image processing is very minimal, to say the least, so I'm ...
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DetectMultiscale in a Multi classification SVM hog classifier in video stream

I want to create a valve detection and classification like this video : https://www.youtube.com/watch?v=VY92fqmSdfA i chose to use HOG(Histogram Oriented Gradient) + SVM, and this is how it works : ...
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1answer
45 views

How to change value of red/green/blue/alpha values from pixels

I'm working on a processing image software and now i want to change white balance and add some saturation on my photos, so i have to work with each pixel value. I've tried to transform my BitmapImage ...
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image classification multiple image for one target

I was thinking about the following problem and I can't image a solution by myself let's imagine you want to classify image, for example pattern on glass When you take picture of the glass with ...
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27 views

Flood Fill 3D image on iOS App produces inconsistent fill output

MY CURRENT RESULT------DESIRED OUTPUT. I am building a mobile app that enables users to select a color from a palette and color parts of a 3D image like a room or wall. I am currently using Opencv ...
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33 views

OpenCV image stitching never finishes

Bit of an odd problem: cv2.Stitcher_create() from 4.1 and cv2.createStitcher() from 3.4.5 both fail to run with the images provided. import cv2 im1 = cv2.imread("C:\\Users\\David\\Pictures\\...
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18 views

reduce side-count of a polygon

Suppose we have image of a simple graphic, and we know it is a polygon, slightly distorted. Is there an image processing way to approximate the original parameters of the graphic object? The matrix ...
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1answer
44 views

Need help in removing salt and pepper noise for blood vessel extraction while keeping vessel information using OpenCV in Python [on hold]

I am currently trying to extract blood vessels from an image of the eye. So far, I have been able to display the blood vessels, but there is still a significant amount of noise around the image - it ...
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Aligning images with the depth map in Opencv

I am working on a dataset where we have RGB images and corresponding depth maps. The depth maps aren't aligned perfectly with the RGB images and we are given the Sensor Calibration for aligning. Here ...
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Find rectangle bounding box in image and crop it

I am new to OpenCV so I really need your help. I have a bunch of images like this one: I need to detect the rectangle on the image, crop it and save it as a new image, like this one: Can you please ...
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9 views

ade20k dataset label issue

I'm having a hard time understanding how to identify the labels in the ade20k dataset. I was looking at the csv https://github.com/CSAILVision/sceneparsing/blob/master/objectInfo150.csv and grabbed ...
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8 views

How should we label occluded images when gathering datasets?

I am currently putting together an imageset for people. I am using labelimg to tag the data with the relevant class-type in XML. In doing this, I have ran into a problem - how do I deal with ...
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How to fix imageJ FileNotFound: Access Denied when doing image stitching?

I am working with ImageJ to stitch images (10x10). I have the memory needed to run the process. But at the end of the process, it gives me this error: ERROR: TextFileAccess.openFileWrite(): java.io....
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1answer
55 views

I'm trying to find out if the background is colored or monochrome

I'm trying to find out if the background is colored or monochrome I'm making the object in the foreground black I couldn't find a method to find out whether the background is colored or monochrome ...
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1answer
37 views

Why isn't the video feed read by the web camera in python code?

When I run my python opencv code, the web camera does not read a video feed. There are no any errors, but the black color output with wifi sign and loading sign i there. How to fix that and read the ...
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“FailedPreconditionError : Attempting to use uninitialized value inception_5b_pool_proj/weights [[node inception_5b_pool_proj/weights/read”

I am trying to extract features of images from a video using google inception v1 from kaffe model. src = args.video_path.split('?')[0] image_dir = save_frames(src) features = feature_extract(...
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1answer
21 views

How to extract depth map of an image

I want to create an app which captures a photo and then extracts the depth data of the image. I'm already done with the taking a photo part by using intent and sending it to the preexisting camera app....
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1answer
27 views

How to calculate circumference of a belly that 3d scanned?

I scan a person with kinect v2 and save his/her body in .ply, .obj, .stl formats. I want to calculate the circumference of the belly, biceps etc. from this 3d scanned body. I am opened to all ideas. ...
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An efficient way to extract, and compare and match fingerprint minutiae

I am currently working on an program that detects and matches fingerprints as part of a fingerprint sensor. After processing the image, I obtain key points using Harris Corner Detection. Then, using ...
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1answer
33 views

How do i convert Gray to RGB in nrrd file

i trying convert grayscale 3D image to RGB 3D image. Now i can get each slice's array. this array value's grayscale pixel value. but i don't know how to covert RGB value. i tried convert color ...
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1answer
62 views

Obtain features inside image and remove boundary

I want to detect features inside an image (retina scan). The image consists of a retina scan inside a rectangular box with black background. I am working with Python 3.6, and I am using Canny Edge ...
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20 views

Error in upload_file(x) : is.character(path) is not TRUE in loop

I am using Microsoft Face API to detect face emotions. After trial and error, I have the following code that works for a single file: local <- "/mypath/image.jpg" x_recognition <- function (x) ...
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why in harr featue's x3 pattern the middle part's weight is 1 instead of 2?

Do you know why in harr featue's x3 pattern the middle part's weight is 1 instead of 2? It means for b the Line Features the middle region colored in black has weight 1. eg, this is OpenCV ...
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22 views

ffmpeg resize large image and high resolution

I tried to resize a very big image (457 MB and 21600x21600) with the following command -i test.png -vf scale=320:-1 out.png but it throws exception saying "Picture size 21600x21600 is invalid". How ...
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35 views

EmguCV template matching on live camera

I'm new in the image-processing thing and I'm trying to make a multiple template matching app with help from EmguCV. On Form1 I have: -an imageBox (pictureBox from EmguCV) where I receive images (...
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29 views

Apply VR lens distortion (barrel distortion) to live video feed

I am trying to create a custom VR headset that displays a live feed from a remote camera, and in order for the view to be clear from the vr headset, I need to duplicate the image from the camera for ...
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0answers
40 views

Merge 1000 transparent png files in one

I'm trying to merge (overlaying) ~1000 (12MB total) transparent images *.png in one png or other raster file. Which package or function in R must be use? The images contains radar cloud data. Evrey ...
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How to set up CPU-intensive web endpoint properly

I need a web route that generates an image using .jpg and several .png files from the disk and returns it back to the client. Since this operation is kind of CPU intensive I decided to try go ...
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1answer
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Keep dictionary elements order the same in AWS Rekognition outputs in python

I am using AWS rekognition to study emotion outputs. This is my code: photo = 'InVacation.jpg' image = Image.open(photo) stream = io.BytesIO() image.save(stream,format="JPEG") image_binary = stream....
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1answer
44 views

How to find distance between two connected points through white pixels?

I want to find the two endpoints of a curve. I used convex hull to find 8 boundary-points and then for every point, distances with all other points are calculated. The points with maximum distances ...
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How to join the broken lines of a binary image in java? [on hold]

[The broken lines Image as given here and they are to be joined resulting the yellow strikes][1]
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47 views

OpenCV--How to detect video bad frame?

I have homework to classify two kinds of images. one is abnormal like pic 1,2,3 and another is normal like pic 4,5. Is there any method or arithmetic to help me to solve this problem? It is like ...
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1answer
14 views

How to identify objects in micron units in regionprops3 comand?

Suppose, I have a 3d image of (x,y,z)=(100,100,500) dimension. My task is to identify some objects in this image. I can identify objects using regionprops3 command from MATLAB. The confusing part is ...
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how to get points mapping after opencv Stitching

I use OpenCV Stitcher class to stitch multiple images together and I can get the final image. But I was wondering how can I get points mapping between original images and stitched image. For example: ...
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how to obtain Gaussian distribution from specific area of an image channel?

I divide an image channel (like contrast) into 12 different areas and I need to obtain Gaussian distribution from each area(like the above image each circle supposes to be a Gaussian distribution), ...
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1answer
39 views

Font matching using image moments in OpenCV

I am creating a code which will tell me how similar two letters are to each other. For this, I decided to go with HuMoments concept in OpenCV. Given are the images that I have Co.jpg C0.jpg A.jpg ...
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2answers
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how to crop images in react-native ,so that it'll be like a round and circular shape instead of ordinary rectangle one?

I do have some pictures, and I need to crop them in a circular shapes before using them in react-native to use as ViroImage in react-viro(a library that render 360Images) I can not apply much styles ...
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1answer
43 views

Python extract multiple objects from image opencv

I am trying to extract object from an image using the color using Opencv, i have tried by inverse thresholding and grayscale combined with findContours but I am unable to use it recursively. ...
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18 views

Extract oriented lines from binary image following Canny edge detection in MATLAB [on hold]

I have written a script that finds the angle of the edges detected in a binary image using a canny method. I would like to extract certain angles and not others and fit line segments to these points ...
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32 views

How to draw a fitting rectangle inside a irregular image area in python? [duplicate]

I have an image on which I applied segmentation task. Now I want to draw a largest fitting rectangle inside the irregular segmented area, how to acheive the same? My aim is to get coordinates of the ...
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11 views

What is the best approach to rescale an image with a non-integer factor?

I'm working on a project for recognition of multiple digits on an image using a neural network trained on the MNIST dataset. The first step is detecting digits on a binary image which is made using ...
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28 views

Is there a name for an algorithm to check whether an image contains a given shape?

Given a bit map defining the shape of some item I want to compute some level of confidence that a pixel map contains the shape. Is there a name for this type of algorithm or perhaps a method in ...
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1answer
49 views

Image Rotation gives grayscale image

I got a problem with my Rotate image function in C++, Using OpenCV and Qt. It kinda does his job, but not as expected, apart of being in grayscale, a part of the image seems to be duplicated at the ...
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1answer
32 views

Segmenting wedges from a Binary image with opencv

I have a B/W image, how do I go about identifying the wedges in the input image as shown in the marked image? Input image Wedges marked on image
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22 views

PyTorch Model is not Learning

I am trying to write a code for the classification task of dogs and cats using resnet18 pretrained model in PyTorch. Here is my code for training: from torchvision import models model = models....
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23 views

A generic error occurred in GDI+ in ASP.NET-Core 2.2

I am trying to create a thumbnail image in asp.net-core 2.2 application but I keep getting the above error whenever it gets to the point of creating the thumbnail. The main image creates and stores ...
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46 views

How to move an image from a canvas to another

I'm trying to do a image processing software and for the moment I'm stuck on this. I've open an image in my first canvas, and now I want to take the image and add some filters on it. Contrast, ...