To be used with regards to converting any image to a binary image having two values 0 and 1. It is a simple elementary image segmentation step.
For details on various methods used visit THIS WIKI PAGE
Questions tagged [image-thresholding]
189 questions
1
vote
1 answer
How to find out whether a line present in one image is subset of another line present in different image using opencv in python?
I have two images say imageA and imageB as shown below. Now I need to check whether the line present in imageB already exists in image A or not (i.e) line present in imageB should be the subset of line present in imageA. I used image subtraction in…
izle_r
- 129
- 1
- 8
1
vote
2 answers
Approximating edge with rough outline - OpenCV
I've been researching and trying a couple functions to get what I want and I feel like I might be overthinking it.
One version of my code is below. The sample image is here.
My end goal is to find the angle (yellow) of the approximated line with…
PlasticBlaze
- 23
- 7
1
vote
1 answer
How to eliminate small irregular shaped squares and to retain only lines and curves in an image using opencv in python?
In the below image, I need to extract only the straight and curved lines and eliminate all other extra boxes as shown below. I am a newbie to OpenCV. Can someone help me with this?
Input Image :
Expected Output Image:
izle_r
- 129
- 1
- 8
1
vote
0 answers
Applying adaptive thresholding on Canny edge detection
I want to remove the blurred background of images in my project dataset, and I already get a pretty nice solution in here using Canny edge detection. I want to apply an adaptive thresholding on the double threshold value requirements of Canny. I…
Bikir
- 33
- 4
1
vote
1 answer
how can i obtain a representation of the roofs from a aerial image using rgb differences?
So i´m learning image processing in python and i came across an exercise on which i'm having strugle to solve. It's given an aerial image:
Aerial Image
The objective is to individualize all the roofs in one image leaving the rest of it (background)…
Jamie Jones
- 37
- 8
1
vote
0 answers
Adjust Threshold Within Macro ImageJ
I'm looking to write a macro which requires user input to segment kidneys through thresholding. I'm currently running this:
selectWindow("Cortex");
//run("Threshold...");
title = "WaitForUserDemo";
msg = "If necessary, use the \"Threshold\" tool…
George Bruce
- 11
- 3
1
vote
1 answer
MATLAB convert graythresh output into actual intensity
I am trying to find the threshold of a 3D image that is 258 x 318 x 801 double. I first reshaped the image into 1D array and then used graythresh
ROI = reshape(postImg,[],1);
thresh = graythresh(ROI);
But I was trying to find the actually intensity…
March2020
- 13
- 4
1
vote
0 answers
How to better segmentation for the complex image?
I need to segment the testes image and detect testes tubules. But I was able to only segmented testes lumens. I need to segment the whole tubules.
How should I proceed?
Explanatory image:
Burak Kahveci
- 11
- 3
1
vote
0 answers
C++ threshold operation to make any pixels that are not black into white
I have implemented a Gaussian blur to allow for the blurring of an image. This image is saved as 'stage2_blurred'. I then want to re-input this 'stage2_blurred' image to then make any pixels that are not black into white, and save the newly created…
user13012331
1
vote
1 answer
OpenCV Each pixel in the return image from adaptiveThreshold function is value 255
I apply adaptive thresholding to gray scale image, and I would like to apply normal thresholding to the return image of that function. This doesn't work since somehow every pixel in the return image is set to 255. I don't understand why this is…
Peyton Hanel
- 374
- 1
- 3
- 13
1
vote
1 answer
How to remove a rough line artifact from image after binarization
I am stuck in a problem where I want to differentiate between an object and the background(having a semi-transparent white sheet with backlight) i.e a fixed rough line introduced in the background and is merged with the object. My algorithm right…
hawxeye
- 99
- 8
1
vote
1 answer
Image Segmentation in MATLAB using adaptive threshold function
I have written some lines of code using the following function:
adaptivethreshold(IM,ws,c)
and it gives me a Mask bw. I multiply this mask with my original image bb and show the…
sn at
- 61
- 7
1
vote
1 answer
Scikit image otsu thresholding producing zero threshold
I am doing some preprocessing on an image, After applying Otsu thresholding on the image I am getting zero threshold while on another image it’s working fine
from skimage import filters
from skimage.io import imread
img = imread(img_path,…
arush1836
- 1,327
- 8
- 19
- 37
1
vote
1 answer
how to conditionally apply threshold in opencv
I have 2 types of image to deal. one with white background and another type with dark background. My requirement is to apply different thresholds for each type
for ex : for white back ground
(thresh, img_bin) = cv2.threshold(img, 128 , 255,…
Suresh Anand
- 33
- 4
1
vote
0 answers
Guidance on how to filter out the notices from the IMAGE before OCR
I have being working on OCR the image by python for a while but there are still rooms to be improved so your input and thoughts will be helpful.
This is what I am currently doing and the ratio of successfully getting a valid ocrText output is…
Alvin Lin
- 11
- 4