The imshow is a function from the matplotlib library that displays an image on the axes.
The imshow is a function from the matplotlib library that displays an image on the axes.
References:
See also:
Questions tagged [imshow]
806 questions
5
votes
1 answer
Matplotlib plot over imshow while keeping axis size
Whenever I use imshow() to plot an image, plotting 1D data over it in a twinned bottom x-axis changes the size and aspect ratio of the initial x-axis created with for imshow(). How do I avoid this behavior? Here is how to reproduce the issue:…
Wall-E
- 623
- 5
- 17
5
votes
2 answers
How do you update inline images in Ipython?
Edit: My question is not in regards to an "animation" per se. My question here, is simply about how to continuously show, a new inline image, in a for loop, within an Ipython notebook.
In essence, I would like to show an updated image, at the same…
TheGrapeBeyond
- 543
- 2
- 8
- 19
5
votes
1 answer
matplotlib imshow -- use any vector as axis
I would like to use any vector as an axis in plt.imshow().
A = np.random.rand(4, 4)
x = np.array([1, 2, 3, 8])
y = np.array([-1, 0, 2, 3])
I imagine something like this:
plt.imshow(a, x_ax=x, y_ax=y)
I know there is an extent parameter available,…
petervanya
- 306
- 4
- 11
5
votes
1 answer
OpenCV python image washout
I am trying to get average merged image to show up using the following code:
import numpy as np
import cv2
import matplotlib.pyplot as plt
dolphin=cv2.imread('dolphin.png',0) #Also tried without the 0
bicycle=cv2.imread('bicycle.png',0)
The…
Omi
- 136
- 1
- 10
5
votes
2 answers
imshow colormap figure and the suptitle don't align in the center
It's a very small issue but still I can't figure it out.
I'm using imshow with matplotlib to plot a colormap - but the result is that the figure and the title are not aligned together:
The code i'm using for the plot is:
fig, ax =…
ValientProcess
- 1,699
- 5
- 27
- 43
5
votes
0 answers
Matplotlib imshow Dates axis
I have dataframe with dates and hours, for every hour (0 - 23) I have data for the corresponding date (2016-11-07 - 2016-11-27):
2016-11-07 2016-11-08 2016-11-09 2016-11-10 2016-11-11 2016-11-12 2016-11-13 2016-11-14 2016-11-15 …
ValientProcess
- 1,699
- 5
- 27
- 43
5
votes
3 answers
why my imshow differs from imwrite
I am using OpenCV 2.4.8 on VS2013. I have the following snippet of code:
Mat img_sum = Mat::zeros(img_gray.size(), CV_32F);
char file_name[FILENAME_MAX];
for (int i = 0; i < SCALE_SIZE; i++){
for (int j = 0; j < ORIENTATION_SIZE;…
Frank
- 53
- 6
5
votes
2 answers
How to completely remove the white space around a scatter plot
I am trying to plot a scatterplot over an image without having any white space around it.
If I plot just the image as follows, then there is no white space:
fig =…
fstab
- 4,801
- 8
- 34
- 66
5
votes
1 answer
Image gradually erased when overlayed with lines
Apart from the fact there exist special functions to plot vector fields, I have encountered a strange Matlab behaviour: Plotting an image (with imagesc or imshow) and overlaying it with colored lines (with plot or line) leads at some point to an…
matheburg
- 2,097
- 1
- 19
- 46
5
votes
3 answers
Creating intersecting images with imshow or other function
I have two 3-D arrays of ground penetrating radar data. Each array is basically a collection of time-lapse 2-D images, where time is increasing along the third dimension. I want to create a 3-D plot which intersects a 2-D image from each array.
I'm…
Blake Lytle
- 53
- 1
- 4
5
votes
1 answer
How do you annotate a matplotlib imshow map with an arrow *and* text?
I am trying to make an illustration that looks like this:
But instead I get this:
Here is my program:
from pylab import *
from matplotlib import colors
# A = [[1,2,3,4,5]]
A = [[0],[1]]
Amap =…
vy32
- 28,461
- 37
- 122
- 246
4
votes
2 answers
Rotate a matrix with Matplotlib
I am rotating a n x n matrix (n = 20, although it could change) 30 degrees rightwards using Matplotlib's transformation methods.
The error shows up because rotation is perfomed from the top and not from the base.
I have tried to inverse the index…
Miguel Gonzalez
- 706
- 7
- 20
4
votes
1 answer
TypeError: mat data type = 0 is not supported
I'd like use cv2.imshow("Otsu img", binary) instead of plt.imshow( binary)
I got the error
Full code:
import matplotlib.pyplot as plt
from skimage import io
from skimage.filters.rank import entropy
from skimage.morphology import disk
import numpy as…
Redhwan
- 927
- 1
- 9
- 24
4
votes
3 answers
Why does a right click open a drop down menu in my OpenCV imshow() window?
I am trying to run the OpenCV Grabcut Sample on my system:
OpenCV version 4.1.0
Python version 3.6.8
IDLE version 3.6.8
Ubuntu 18.04.2
This is the build information from cv2.getBuildInformation():
In the Grabcut Sample script, I need to 'draw a…
Stephen Meschke
- 2,820
- 1
- 13
- 25
4
votes
1 answer
Imshow in polar coordinates
I have disk simulation data with snapshots in a .dat file. I want to plot only one but in polar coordinates.
I have:
rho =…
jmgarrido
- 41
- 1
- 4