Questions tagged [image-preprocessing]
285 questions
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How to Get the Average Color of a UIImage Excluding the Transparent Parts
How do I get the average color of the non-transparent parts of an image?
I get that you can get the average color of an image using the block of code below, but it also factors in the transparent parts to the calculation.
var averageColor: UIColor?…
Gerald Kim Ico
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1 answer
Data API Error : Cannot convert a symbolic Tensor (truediv:0) to a numpy array
I have 45000 images of size 224*224, stored as a numpy array. This array, called source_arr has shape 45000,224,224 and it fits in the memory.
I want to divide this array into train, test and validate array and pre-process (normalize and convert…
Divya Choudhary
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2 answers
How to auto adjust contrast and brightness of a scanned Image with opencv python
I want to auto adjust the brightness and contrast of a color image taken from phone under different lighting conditions. Please help me I am new to OpenCV.
Source:
Input Image
Result:
result
What I am looking for is more of a localized…
ISHAN JAISWAL
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1 answer
How to use keras.preprocessing.ImageDataGenerator.flow_from_dataframe() method when the column contains target labels in form of vectors? (Keras)
I am training a CNN model. I am using a dataframe which contains one column for the image path. The other columns(bbox, category,attributes) contains target labels stored as encoded list. The snippet of the dataframe is given here:
The dataframe…
Shrey Shah
- 109
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Unexpected outputs from model.predict when using rescaling
First off: I'm aware of this post, but it doesn't provide an answer.
I am building my model like this:
from keras.models import Sequential
from keras.layers import Conv2D, MaxPooling2D, Dense, Flatten, Dropout
from keras.preprocessing.image import…
Bodine
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Is there a better way to resize an image that is in the form of a numpy array?
I'm new to neural networks, and have been practicing image preprocessing. I am trying to resize images that are in the form of numpy arrays, and this is my current method:
# using tensorflow, resize the image
im = tf.image.resize(img_as_array,…
sine_nomine
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ImageDataGenerator is not saving the actual output to the disk
I have a training set of images with structure like this:
path = /aug-dir/img_dir
1.jpg
2.jpg
...jpg
I am trying to augment the images and save them to disk for future use. I want to implement the below…
Rao208
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How to implement rescaling in custom DataGenerator?
I created a custom DataGeneratorby using tf.keras.utils.Sequence:(https://www.tensorflow.org/api_docs/python/tf/keras/utils/Sequence).
This is the customized DataGenerator:
# Here, `x_set` is list of path to the images
# and `y_set` are the…
Tobitor
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Is it possible to apply image pre-processing techniques on test data
In the case of a deep CNN task, I do understand that sometimes image pre-processing techniques such as gaussian filtering and cropping can be helpful for deep CNN modeling. I wonder if it is also acceptable to be applied to testing data as well.…
Dave
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Many values in the dataset
I have some questions about how to deal with 0 value in 2d array.
I am planning to work on regression 1d CNN, but most of the data is made of 0.
I would like to replace this 0 to other small values such as 0.000001 simply because, if I put 0,…
손상우
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0 answers
Trying to run a python script where i mainly use opencv on my gpu
So I've tried everything, I've tried to work on ubuntu, on windows, tried every solution online but I don't get it; I'm missing something.
I have this code and I'm trying to run it on my gpu, i'm using windows mainly; I have also acess to ubuntu…
Moustafa
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Correct pre-processing pipeline for inference from tensorflow lite model
The question is related to inferencing from a tflite model converted from standard keras-tensorflow Mobilenetv2 model.
tf version: 2.2.0
The model has been trained using 0-1 normalization as provided in documentation/example:
here
After…
Sanjeev
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1 answer
I faced some problems to enhance on multiple images using Python, It shows some error
Here, I want to change the default sharpness of the image dataset. It works fine for a single image, but when I apply on multiple images, it shows me an error like AttributeError: 'numpy.ndarray' object has no attribute 'filter'. What should I do to…
Jacob
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1 answer
Read multiple images from specific directory, prepossessed and save them another directory using python and opencv
I'm a beginner in Python and OpenCV. I want to read multiple images from a specific directory and preprocess them using CLAHE(Contrast Limited Adaptive histogram equalization) and finally save them (Preprocessed images) to another directory. I tried…
Jacob
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1
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3 answers
What does the Backslash Operator do in Python and More?
In this link, I found the following line of code:
image = Image.open("testOCR3.png")\
.convert('L').resize([3 * _ for _ in image.size], Image.BICUBIC)\
.point(lambda p: p > 75 and p + 100)
Unfortunately, I just don't understand it…
user11978420