CODEWITHSUNDEEP
pythonimageimage-processingpython-imaging-library
Shubham Chahal
Shubham Chahal

Reputation: 834

TypeError: Image data can not convert to float

I am trying to create a 16-bit image like so:

import skimage 
import random
from random import randint                        
xrow=raw_input("Enter the number of rows to be present in image.=>")
row=int(xrow)
ycolumn=raw_input("Enter the number of columns to be present in image.=>")
column=int(ycolumn)

A={}
for x in xrange(1,row):
    for y in xrange(1,column):
        a=randint(0,65535)
        A[x,y]=a 

imshow(A)

But I get the error TypeError: Image data can not convert to float.

Upvotes: 76

Views: 414192

Answers (20)

beeCwright
beeCwright

Reputation: 380

For anyone still stuck with this error trying to open an image, my problem was that the image was an .heic file and for whatever reason PIL.Image could not open it.

You can try some of these solutions: How to work with HEIC image file types in Python

I used this library https://docs.wand-py.org/en/0.6.4/ and was able to open the image from s3 as a stream without modifying the image. You could also just open from disk, I was just happened to be using s3.

from io import BytesIO
from wand.image import Image
s3_resource = boto3.resource('s3')

s3_resource = boto3.resource('s3')
bucket = s3_resource.Bucket(your_bucket)
object = bucket.Object(your_key)
response = object.get()
file_stream = response['Body'].read()
image = Image(file=BytesIO(file_stream))

Upvotes: 0

Hosseinzlf
Hosseinzlf

Reputation: 21

This problem is due to the missing the parenthesis on the squeeze function.

plt.imshow(image.squeeze)

To solve the problem, add parenthesis to invoke the squeeze function.

plt.imshow(image.squeeze())

Upvotes: 0

Shyam Nandan
Shyam Nandan

Reputation: 1

For this kind of error try checking file path or name

Upvotes: 0

Rahul Gulia
Rahul Gulia

Reputation: 69

For an image file in .mat format. I have done the following to show the image using the imshow() function.

mat = scipy.io.loadmat('point05m_matrix.mat')

x = mat.get("matrix")
print(type(x))
print(len(x))

plt.imshow(x, extent=[0,60,0,55], aspect='auto')
plt.show()

Upvotes: -2

xuxu li
xuxu li

Reputation: 9

Or maybe the image path contains Chinese characters, changing to English characters will solve this question.

enter image description here

enter image description here

Upvotes: 0

Livid
Livid

Reputation: 106

This happened because you may transfer a wrong type to imshow(), for example I use albumentations.Compose to change image, and the result is a dict rather than numpy.ndarray. so just change

plt.imshow(cv2.cvtColor(aug(image=img), cv2.COLOR_BGR2RGB))

to

plt.imshow(cv2.cvtColor(aug(image=img)['image'], cv2.COLOR_BGR2RGB))

then it works.

Upvotes: 1

Srinath Kalikivayi
Srinath Kalikivayi

Reputation: 31

Input should be array

plt.imshow(plt.imread('image_path'))

Upvotes: -1

devansh
devansh

Reputation: 89

The problem was that my array was in type u3 i changed it to float and it worked for me . I had a dataframe with Image column having the image/pic data.Reshaping part depends to person to person and image they deal with mine had 9126 size hence it was 96*96.

a = np.array(df_train.iloc[0].Image.split(),dtype='float')
a = a.reshape(96,96)
plt.imshow(a)

Upvotes: -1

Yash Khasgiwala
Yash Khasgiwala

Reputation: 711

First read the image as an array

image = plt.imread(//image_path)
plt.imshow(image)

Upvotes: 24

spurthi
spurthi

Reputation: 321

The error occurred when I unknowingly tried plotting the image path instead of the image.

My code :

import cv2 as cv
from matplotlib import pyplot as plt
import pytesseract
from resizeimage import resizeimage

img = cv.imread("D:\TemplateMatch\\fitting.png") ------>"THIS IS THE WRONG USAGE"
#cv.rectangle(img,(29,2496),(604,2992),(255,0,0),5)
plt.imshow(img)

Correction: img = cv.imread("fitting.png") --->THIS IS THE RIGHT USAGE"

Upvotes: 28

Scott
Scott

Reputation: 5840

In my case image path was wrong! So firstly, you might want to check if image path is correct :)

Upvotes: 0

Maheep
Maheep

Reputation: 887

I was also getting this error, and the answers given above says that we should upload them first and then use their name instead of a path - but for Kaggle dataset, this is not possible.

Hence the solution I figure out is by reading the the individual image in a loop in mpimg format. Here we can use the path and not just the image name.

I hope it will help you guys. 

import matplotlib.image as mpimg
for img in os.listdir("/content/train"): 
  image = mpimg.imread(path)
  plt.imshow(image)
  plt.show()

Upvotes: 5

Anku5hk
Anku5hk

Reputation: 39

As for cv2 is concerned.

  1. You might not have provided the right file type while cv2.imread(). eg jpg instead of png.
  2. Or you are providing image path instead of image's array. eg plt.imshow(img_path),

try cv2.imread(img_path) first then plt.imshow(img) or cv2.imshow(img).

Upvotes: -1

GoingMyWay
GoingMyWay

Reputation: 17468

Try this 

plt.imshow(im.reshape(im.shape[0], im.shape[1]), cmap=plt.cm.Greys)

It would help in some cases.

Upvotes: 0

Hong Cheng
Hong Cheng

Reputation: 370

I guess you may have this problem in Pycharm. If so, you may try this to your problem.

Go to File-Setting-Tools-Python Scientificin Pycharm and remove the option of Show plots in tool window.

Upvotes: 0

blitzor
blitzor

Reputation: 71

Try to use this,

   plt.imshow(numpy.real(A))
   plt.show()

instead of plt.imshow(A)

Upvotes: 3

comet
comet

Reputation: 796

This question comes up first in the Google search for this type error, but does not have a general answer about the cause of the error. The poster's unique problem was the use of an inappropriate object type as the main argument for plt.imshow(). A more general answer is that plt.imshow() wants an array of floats and if you don't specify a float, numpy, pandas, or whatever else, might infer a different data type somewhere along the line. You can avoid this by specifying a float for the dtype argument is the constructor of the object.

See the Numpy documentation here.

See the Pandas documentation here

Upvotes: 63

mastDrinkNimbuPani
mastDrinkNimbuPani

Reputation: 1249

This happened for me when I was trying to plot an imagePath, instead of the image itself. The fix was to load the image, and plotting it.

Upvotes: 45

ntg
ntg

Reputation: 14075

try 

import skimage
import random
from random import randint
import numpy as np
import matplotlib.pyplot as plt


xrow = raw_input("Enter the number of rows to be present in image.=>")
row = int(xrow)
ycolumn = raw_input("Enter the number of columns to be present in image.=>")
column = int(ycolumn)

A = np.zeros((row,column))
for x in xrange(1, row):
    for y in xrange(1, column):
        a = randint(0, 65535)
        A[x, y] = a

plt.imshow(A)
plt.show()

Upvotes: 3

Michiel Overtoom
Michiel Overtoom

Reputation: 1619

From what I understand of the scikit-image docs (http://scikit-image.org/docs/dev/index.html), imshow() takes a ndarray as an argument, and not a dictionary:

http://scikit-image.org/docs/dev/api/skimage.io.html?highlight=imshow#skimage.io.imshow

Maybe if you post the whole stack trace, we could see that the TypeError comes somewhere deep from imshow().

Upvotes: 3

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