Questions tagged [image-preprocessing]
285 questions
23
votes
13 answers
HOW TO FIX IT? AttributeError: module 'keras.preprocessing.image' has no attribute 'load_img'
import numpy as np
from keras.preprocessing import image
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
%matplotlib inline
…
Muhammad Syahdewa
- 231
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23
votes
4 answers
Error while resizing image: "error: (-215:Assertion failed) func != 0 in function 'resize'"
I'm trying to preprocess images dataset, represented in numpy array with images of shape (28, 28) by rescaling them to (10, 10). I wrote a function for that:
import cv2 as cv
def resize_dataset(images):
resized_images = []
for img in…
zeyger
- 1,320
- 1
- 12
- 18
18
votes
4 answers
Numpy:zero mean data and standardization
I saw in tutorial (there were no further explanation) that we can process data to zero mean with x -= np.mean(x, axis=0) and normalize data with x /= np.std(x, axis=0). Can anyone elaborate on these two pieces on code, only thing I got from…
econ
- 495
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- 16
14
votes
1 answer
How to use repeat() function when building data in Keras?
I am training a binary classifier on a dataset of cats and dogs:
Total Dataset: 10000 images
Training Dataset: 8000 images
Validation/Test Dataset: 2000 images
The Jupyter notebook code:
# Part 2 - Fitting the CNN to the images
train_datagen =…
mayuresh_sa
- 159
- 1
- 1
- 7
13
votes
3 answers
Keras VGG16 preprocess_input modes
I'm using the Keras VGG16 model.
I've seen it there is a preprocess_input method to use in conjunction with the VGG16 model. This method appears to call the preprocess_input method in imagenet_utils.py which (depending on the case) calls…
user3731622
- 4,844
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- 84
13
votes
5 answers
How to implement ZCA Whitening? Python
Im trying to implement ZCA whitening and found some articles to do it, but they are a bit confusing.. can someone shine a light for me?
Any tip or help is appreciated!
Here is the articles i read…
user2136049
11
votes
3 answers
Keras image_dataset_from_directory not finding images
I want to load the data from the directory where I have around 5000 images (type 'png'). But it returns me an error saying that there are no images when obviusly there are images.
This code:
width=int(wb-wa)
height=int(hb-ha)
directory =…
Lluis C
- 438
- 3
- 10
7
votes
1 answer
Image Preprocessing for OCR - Tessaract
Obviously this image is pretty tough as it is low clarity and is not a real word. However, with this code, I'm detecting nothing close:
import pytesseract
from PIL import Image, ImageEnhance, ImageFilter
image_name = 'NedNoodleArms.jpg'
im =…
Ashley O
- 1,130
- 3
- 21
- 34
7
votes
1 answer
Keras image augmentation: How to choose "steps per epoch" parameter and include specific augmentations during training?
I am training an image classification CNN using Keras.
Using the ImageDataGenerator function, I apply some random transformations to the training images (e.g. rotation, shearing, zooming).
My understanding is, that these transformations are applied…
Mario Kreutzfeldt
- 559
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7
votes
3 answers
Is this the correct way of whitening an image in python?
I am trying to zero-center and whiten CIFAR10 dataset, but the result I get looks like random noise!
Cifar10 dataset contains 60,000 color images of size 32x32. The training set contains 50,000 and test set contains 10,000 images respectively.
The…
Hossein
- 24,202
- 35
- 119
- 224
6
votes
3 answers
remove small whits dots from binary image using opencv python
i have a binary image and I want to remove small white dots from the image using opencv python.You can refer to my problem here enter link description here
My original image is
i want the output image as:
Krupali Mistry
- 624
- 1
- 9
- 23
5
votes
2 answers
Programmatically divide scanned images into separate images
In order to improve OCR quality, I need to preprocess my scanned images. Sometimes I need to OCR the image with few pictures (components on the page and they are at different angles - for example, a few paper documents scanned at one time), for…
alexanoid
- 24,051
- 54
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4
votes
0 answers
How to make vector graphics image using python
I am trying to make a project to convert an image to a vector graphic image, how can I do this?
Farid Chowdhury
- 2,766
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- 21
4
votes
1 answer
How should image preprocessing and data augmentation be for semantic segmentation?
I have an imbalanced and small dataset which contains 4116 224x224x3 (RGB) aerial images. It's very likely that I will encounter the overfitting problem since the dataset is not big enough. Image preprocessing and data augmentation help to tackle…
saki
- 117
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4
votes
2 answers
Writing your custom function for image preprocessing in Keras
I am a beginner training an image dataset on diabetic retinopathy, using the keras_flow_from_dataframe class. But my model has been underfitting. So I tried preprocessing, by writing a custom preprocessing function to be passed in my image data…
Victor E. Irekponor
- 53
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