Questions tagged [scikit-image]
scikit-image is a Python image processing toolbox for SciPy.
scikit-image
1,914
questions
93
votes
12
answers
350k
views
Import error No module named skimage
I am building code on python using skimage. But I am getting import errors while using skimage.segmentation.
Traceback (most recent call last):
File "superpixel.py", line 5, in
from ...
- 1,047
76
votes
7
answers
56k
views
ImportError: cannot import name '_validate_lengths'
I have started learning Tensorflow. I am using Pycharm and my environment is Ubuntu 16.04. I am following the tutorial. I cross check the nump. It is up-to-date. I don't know the reason of this error.
...
- 845
64
votes
6
answers
71k
views
How do I remove the background from this kind of image?
I want to remove the background of this image to get the person only. I have thousand of images like this, basically, a person and a somewhat whitish background.
What I have done is to use edge ...
- 3,183
64
votes
4
answers
53k
views
inline images have low quality
I'm loading a TIF file with scikit-image and displaying it inline in an ipython notebook (version 2.2.0). This works, however, the image is quite small when first displayed, and when I resize it ...
- 665
62
votes
9
answers
123k
views
Calculating percentage of Bounding box overlap, for image detector evaluation
In testing an object detection algorithm in large images, we check our detected bounding boxes against the coordinates given for the ground truth rectangles.
According to the Pascal VOC challenges, ...
- 12.6k
60
votes
4
answers
140k
views
How to find the average colour of an image in Python with OpenCV?
I tried this code:
import cv2
image = cv2.imread("sample.jpg")
pixel = image[200, 550]
print pixel
But I am getting error as:
'Nonetype' no attributes error getitem
This error is getting ...
56
votes
7
answers
86k
views
How can I read an image from an Internet URL in Python cv2, scikit image and mahotas?
How can I read an image from an Internet URL in Python cv2?
This Stack Overflow answer,
import cv2.cv as cv
import urllib2
from cStringIO import StringIO
import PIL.Image as pil
url="some_url"
...
- 2,252
44
votes
2
answers
26k
views
Split text lines in scanned document
I am trying to find a way to break the split the lines of text in a scanned document that has been adaptive thresholded. Right now, I am storing the pixel values of the document as unsigned ints from ...
- 4,166
39
votes
4
answers
40k
views
ImportError: cannot import name 'structural_similarity' error
In my image comparision code following: https://www.pyimagesearch.com/2014/09/15/python-compare-two-images/
While using
from skimage.measure import structural_similarity as ssim
and then
s = ssim(...
- 7,362
35
votes
3
answers
59k
views
How to read mp4 video to be processed by scikit-image?
I would like to apply a scikit-image function (specifically the template matching function match_template) to the frames of a mp4 video, h264 encoding. It's important for my application to track the ...
- 545
30
votes
7
answers
55k
views
Skimage: how to show image
I am novice at skimage and I try to show the image in my ipython notebook:\
from skimage import data, io
coins = data.coins()
io.imshow(coins)
But I see only the following string:
<matplotlib....
- 501
29
votes
7
answers
38k
views
Interactive pixel information of an image
Short version: is there a Python method for displaying an image which shows, in real time, the pixel indices and intensities? So that as I move the cursor over the image, I have a continually updated ...
- 1,314
25
votes
1
answer
26k
views
skimage: Why does rgb2gray from skimage.color result in a colored image?
When I tried to convert the image to gray scale using:
from skimage.io import imread
from skimage.color import rgb2gray
mountain_r = rgb2gray(imread(os.getcwd() + '/mountain.jpg'))
#Plot
import ...
- 2,903
25
votes
2
answers
23k
views
libraries mkl_rt, openblas, lapack not found while installing scipy - How to change flags for libraries
I am new to python and pip ecosystem. I am trying to install scikit-image and it is installing scipy as a dependency I suppose. I am using macOS 11.1 and I know that support for this version is not ...
- 351
24
votes
3
answers
15k
views
Extract blocks or patches from NumPy Array
I have a 2-d numpy array as follows:
a = np.array([[1,5,9,13],
[2,6,10,14],
[3,7,11,15],
[4,8,12,16]]
I want to extract it into patches of 2 by 2 sizes with ...
- 1,403
23
votes
6
answers
37k
views
How to crop or remove white background from an image
I am trying to compare images using OpenCV and Python.
Consider these images:
Both feature an identical pair of shoes, set to a white background. The only difference being that the first has a ...
- 245
23
votes
6
answers
39k
views
Alternative to scipy.misc.imresize()
I want to use an old script which still uses scipy.misc.imresize() which is not only deprevated but removed entirely from scipy. Instead the devs recommend to use either numpy.array(Image.fromarray(...
- 4,795
20
votes
2
answers
7k
views
Feature extraction and take color histogram
I am working on an image processing feature extraction. I have a photo of a bird in which I have to extract bird area and tell what color the bird has. I used canny feature extraction method to get ...
- 12.5k
18
votes
5
answers
57k
views
How to invert black and white with scikit-image?
I read an image with ndimage, which results in a binary image like this:
I would like to invert the image such that white turns into black, and vice versa.
Help is appreciated.
- 1,249
17
votes
2
answers
54k
views
Error with pip install scikit-image
I am using Windows 8.1 64 bit and Python 2.7. While trying to install scikit-image from the shell
pip install scikit-image
I have encountered this error:
Command "python setup.py egg_info" failed ...
- 7,759
16
votes
2
answers
23k
views
Calculating entropy from GLCM of an image
I am using skimage library for most of image analysis work.
I have an RGB image and I intend to extract texture features like entropy, energy, homogeneity and contrast from the image.
Below are ...
- 1,067
14
votes
2
answers
5k
views
Detecting comic strip dialogue bubble regions in images
I have an grayscale image of a comic strip page that features several dialogue bubbles (=speech baloons, etc), that are enclosed areas with white background and solid black borders that contain text ...
- 16.8k
13
votes
4
answers
16k
views
Input image dtype is bool. Interpolation is not defined with bool data type
I am facing this issue while using Mask_RCNN to train on my custom dataset with multiple classes.
This error occurs when I start training. This is what I get:
/home/parth/anaconda3/envs/compVision/...
- 352
13
votes
2
answers
8k
views
How to turn off skimage warnings
I want to turn off skimage UserWarning: I used this code but they are still enabled.
with warnings.catch_warnings():
warnings.simplefilter("ignore")
skimage.io.imsave
- 1,682
13
votes
1
answer
16k
views
Skimage - Weird results of resize function
I am trying to resize a .jpg image with skimage.transform.resize function. Function returns me weird result (see image below). I am not sure if it is a bug or just wrong use of the function.
import ...
- 1,404
13
votes
2
answers
20k
views
How can i convert images from scikit-image to opencv2 and other libraries?
I tried to find contour with cv2 python library in a skeletonized image created with scikit-image and i got this error:
contours, hierarchy = cv2.findContours(skel,cv2.RETR_TREE,cv2....
- 415
12
votes
3
answers
68k
views
bins must increase monotonically
I just want to draw Matplotlib histograms from skimage.exposure but I get a ValueError: bins must increase monotonically. The original image comes from here and here my code:
from skimage import io, ...
- 135
12
votes
2
answers
10k
views
Convert boolean numpy array to pillow image
I'm currently working with image processing in python using the scikit-image library. I'm trying to make a binary image using sauvola thresholding with the following code:
from PIL import Image
...
- 355
12
votes
1
answer
26k
views
Save numpy array as image with high precision (16 bits) with scikit-image
I am working with 2D floating-point numpy arrays that I would like to save to greyscale .png files with high precision (e.g. 16 bits). I would like to do this using the scikit-image skimage.io package ...
- 1,035
12
votes
1
answer
4k
views
Geometric warp of image in python
I would like to use python to perform a geometric transform over an image, to 'straighten' or rectify an image along a given curve. It seems that scikit-image ProjectiveTransform() and warp() are very ...
- 23k
12
votes
1
answer
995
views
Curve Fitting in 2D Images With Missing Data
I have split contours in a image and I want to connect them assuming they are parametrized curves. I was considering some curve fitting or curve
tracing - but I do not know, how can I implement it.
I ...
- 379
11
votes
1
answer
33k
views
How to extract green channel from RGB image in Python using Scikit-Image library?
I am extremely new to scikit-image (skimage) library in Python for image processing (started few minutes ago!). I have used imread to read an image file in a numpy.ndarray. The array is 3 dimensional ...
- 4,896
11
votes
1
answer
12k
views
Is there a way to automatically correct the color balance?
I'm looking for a solution to automatically adjust the color balance?
I would like to use the pictures for color analysis and comparison, therefore color balance is important.
I was hoping a feature ...
- 792
11
votes
3
answers
7k
views
Denoise and filter an image
I am doing a license-plate recognition. I have crop out the plate but it is very blurred. Therefore I cannot split out the digits/characters and recognize it.
Here is my image:
I have tried to ...
- 1,934
11
votes
1
answer
24k
views
Which SSIM is correct : skimage.metrics.structural_similarity()?
Stackoverflow comunity,
I'm trying to compute SSIM (Structural SIMilarity) between two bmp images on Python. I've found structural_similarity() function implemented in the skimage python library and ...
- 1,034
11
votes
1
answer
8k
views
Scikit-image expanding active contour (snakes)
I followed the example from this link. However, the contour contracts from the init points. Is it possible to do contour that expands out? I want something like the image shown. The image on the left ...
- 5,290
11
votes
1
answer
14k
views
How to correctly use cv2.imwrite to save an image in openCV with cv2.selectROI
I am trying out OpenCV's ROI function. With this I am trying to crop out a section of an image that I load. After that I am trying to save the image as well as show it. Showing it is not much of a ...
- 495
10
votes
4
answers
43k
views
crop image in skimage?
I'm using skimage to crop a rectangle in a given image, now I have (x1,y1,x2,y2) as the rectangle coordinates, then I had loaded the image
image = skimage.io.imread(filename)
cropped = image(x1,y1,...
- 7,521
10
votes
4
answers
21k
views
How to convert PNG to JPG in Python?
I'm trying to compare two images, one a .png and the other a .jpg. So I need to convert the .png file to a .jpg to get closer values for SSIM. Below is the code that I've tried, but I'm getting this ...
- 129
10
votes
2
answers
25k
views
scikit-image: write a ndarray to image with imsave, read back with imread, data don't match
here is the minimum working example:
import numpy as np
from skimage.io import imsave, imread
image = np.array([[[109, 232, 173],
[ 55, 35, 144]],
[[ 43, 124, 185],
...
- 2,588
10
votes
5
answers
18k
views
Why is Gaussian Filter different between cv2 and skimage?
I've got an image that I apply a Gaussian Blur to using both cv2.GaussianBlur and skimage.gaussian_filter libraries, but I get significantly different results. I'm curious as to why, and what can be ...
- 1,851
10
votes
6
answers
6k
views
How to export contours created in scikit-image find_contours to shapefile or geojson?
I'm trying to export the results of the scikit-image.measure.find_contours() function as a shapefile or geojson after running on a satellite image.
The output is an array like (row, column) with ...
- 431
10
votes
1
answer
22k
views
The kernel appears to have died. It will restart automatically
When running:
from skimage import data
in jupyter notebook I always get the error : "The kernel appears to have died. It will restart automatically"
I use:
Anaconda 4.2.0 (64-bit)
Python 3.5.2
...
- 169
10
votes
1
answer
681
views
Finding pits in an image
One of my friend was working on following project:
Below is the microscopic (SEM) image of the surface of stainless steel.
But you can see, it is corroded a little bit (after long exposure to ...
- 52.4k
9
votes
3
answers
10k
views
Updating .Spec file for Pyinstaller gets reset
I am trying to modify the default .spec file created by Pyinstaller to include hidden imports and datas however everytime I run pyinstaller and specify the spec file like pyinstaller source.py spource....
- 91
9
votes
2
answers
11k
views
How to resize a labeled mask with nearest neighbor interpolation using scikit-image
I want to resize a labeled segmentation mask specifically with nearest neighbor interpolation.
scikit-image has two relevant functions: resize and rescale
But neither of these functions allow you to ...
- 2,203
9
votes
2
answers
25k
views
Load custom image from file system in scikit-image
I am new to Python and I am trying to do the tutorial, shown on the official page. My goal is, to analyze a picture I've created, using the Local Otsu Threshold method.
The code with an example ...
- 805
9
votes
2
answers
16k
views
What to choose to begin with ComputerVision: Scikit-image or OpenCV? [closed]
My goal is to recognize specific types of traffic signs: red circles on video in real time.
- 253
9
votes
2
answers
35k
views
OpenCV: RGB to YUV conversion, and showing channels like Wikipedia
I have been looking this conversion for a while. What are the ways of converting RGB image to YUV image and accessing Y, U and V channels using Python on Linux? (using opencv, skimage, or etc...)
...
- 556
9
votes
2
answers
42k
views
ellipse detection in opencv python
My image is here:
i'm looking for a better solution or algorithm to detect the ellipse part (dish) in this photo and mask it in an other photo in Opencv.
could you please give me some advice or ...
