Questions tagged [image-preprocessing]
The image-preprocessing tag has no usage guidance.
60
questions
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3 views
Fastest batch perspective transform for image augmentation
I need to do some augmentation for my training images for a neural networks.
The problem is that even when loading batches in parallel, the augmentation is taking longer to perform than the network ...
0
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0answers
10 views
How to make a heatmap using keypoints from MPII data set
So I am tiring to figure this out but keep running into a wall. So what I want to do is create a heatmap from a 2D image based on the key points generated from the MPII dataset. I have found a CSV ...
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2answers
33 views
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2answers
19 views
What's the meaning of precomputed features?
When i learn about deep learning, I found dataset with precomputed features form. Link (http://cs.stanford.edu/people/karpathy/deepimagesent/coco.zip). What's the different with usual dataset?
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0answers
12 views
Image Quality Assessment Algorithms
I am working on super resolution projects using Generative Adversarial Networks. I need to validate the generated image whether they are close to original one. I already worked with SSIM and PSNR. is ...
1
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2answers
42 views
How to Extract Information from the Image(PNG)
I'm trying to extract some particular information from the image(png).
I tried to extract the text using the below code
...
1
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1answer
19 views
Medical Image Analysis
What are some good starting points for learning medical image analysis and combining it with deep learning?
I would like to analyze images with bone cancers but not sure what is proper way to ...
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0answers
7 views
Process with which ImageDataGenerator with flow_from_directory() method fetches and augments images from a directory in Keras 2
When using Keras 2.0 ImageDataGenerator and in particular the flow_from_directory() method to perform data augmentation, how many images are generated and in what order? Do we have a way to control ...
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0answers
9 views
Shuffling the images with DataImageGenerator and flow_from_directory in a Medical application (tensorflow 2/Keras)
I am facing the following situation: I have CT images (scans) of patients where 10 images describe each patient. These images are stored in separate directories based on what is the focus of each ...
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0answers
21 views
Detect the important part of a receipt (CNN)
In general I want to detect prices and products from a receipt. My approach was to detect the important part of the receipt (products with their prices) to then afterwards pass to firebase ml kit to ...
0
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2answers
26 views
Why do we need convolutions over volume in convolutional neural networks for image recognition?
In convolutional neural networks, we make convolutions of three channels (red, green, blue) with a filter of dimensions $k\times k\times 3$, like in the picture:
Each filter consists of adjustable ...
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0answers
15 views
Need to apply Custom weights in case of semantic segmentation
I am solving a multi-class image segmentation problem.
The following is my map of a fundus image:
The correspondence is the following:
...
0
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1answer
22 views
A Question: is it possible for me to create an AI that learns to play games which I did not create?
Mainly, I have a question which I could not find an answer for anywhere, about an AI machine learning game.
Is it possible for me to create an AI which can learn a game that I did not myself create, ...
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0answers
24 views
How to remove noise using morphological filtering
I have two groups of dots that both contain noise between them:
The line that separates the two groups in the picture is diagonal in shape.
I tried to use morphological filtering on this image to ...
0
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0answers
40 views
How to create an image with pixel values of another image?
I have the following situation:
I have an image file with each pixel having a specific value. Now I want to rearrange and distribute these pixel values so that the result image looks similar to a set ...
1
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1answer
46 views
Tread wear detection
I have an assignment in which I have to provide a solution to measure the tread depth of a tire using a single rgb image.
I thought of two possible solutions:
Using CNN to measure the image ...
0
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0answers
17 views
Multi-label Image Classification Neural Network
I am attempting to complete an old Kaggle competition on the iMet collection but having difficulties understanding how to preprocess the data. The data set consists of photos with a photo_id, a csv ...
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0answers
15 views
What transforms do we need to apply to masks of images in segmentation tasks
I am trying a semantic segmentation task for multi-class segmentation.
I am wondering what transforms are applied to both images and masks in it.
Following are my transforms-
...
0
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1answer
61 views
How to prepare training data for deep learning models
I am working on a project which involves the application of deep learning models. I have collected training data. In collected images, I have more than one object in interest. I am not very clear how ...
0
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1answer
35 views
How to retrieve images from a url in a pandas dataframe and store them as PIL object in a new column
I'm trying to store as a PIL object in a new column of a dataframe pictures that are located in a column of the same dataframe in the form of URL's.
I've tried the following code:
...
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0answers
8 views
Validation of Images generated using DCGAN
I have trained a Deep Convolutional Generative Adversarial Network(DCGAN) model and generated some images. Now, I need to validate these images if generated images ...
3
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1answer
42 views
How and Why to rescale image range between [0,1] and [-1,1]
I am trying to implement model described in Photo-Realistic Single Image Super-Resolution Using a Generative Adversarial Network in which author says in section 3.2 that
We scaled the range of the ...
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0answers
23 views
Developing an encoder/decoder for image modification
On the project I am currently working on, my goal is to train a neural network to convert images of circles to ellipses in a way that models convolution/blurring in real imaging processes.
What ...
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0answers
12 views
MaskRCNN generated masks are not sharp
I have trained my maskrcnn for object segmentation but the generated masks are not sharp. They have a blurry edges and unrefined outlines. Do you have a work around to this solve this problem?
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0answers
16 views
Preprocessing data in image segmentation problem
I am implementing a research paper on image segmentation.
Following are the image segmentation steps which are to be done before training its network-
1.Following image normalization is used-
...
1
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1answer
48 views
after augmentation validation accuracy going down?
My main question is about augmentation.
if I process the augmentation I believe it always better than less data
but in my case the validation accuracy going down
train : 7000 images , validation: ...
0
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0answers
210 views
Input format of label images (ImageDataGenerator) for multi-class semantic image segmentation in keras
I wondered if you could help me (and hopefully others too) to understand how to use keras' ImageDataGenerator to load in my label_masks and zip them with the input_images for semantic segmentation. My ...
1
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2answers
29 views
Keras Model question for Pre trained model extension
I want to add a few more layers to a Resnet50 model and my question is - do I need to compile it and train it on new data or can I just use it as it is? Will it just give me the Resnet50 results?
...
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1answer
37 views
numpy array reshape question
Let's say that I have image data with shape $(32, 32, 3)$ and $50000$
If I would like to reshape it to $(50000, 3, 32, 32)$ what should I do?
I tried ...
0
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2answers
31 views
How to train or approach the image datasets with different resolution in Deep Learning
Image classification:
I am having a data set of image collection more than 10k but even though all are the same image but taken in different sizes (pixels into pixels) some are in square and some are ...
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0answers
93 views
Image is in JPEG but Torchvision shows image extension is unsupported
I just resized the image dataset with Pillow and exported to JPEG
mydata = dsets.ImageFolder(data_path_here, transform=transform)
Image is exported in JPG format ...
1
vote
1answer
137 views
What is the difference between normalization and zero centering?
I am working on some per-processing for lung CT images, I see a nice tutorial in here, two of them are normalization and zero centering, I wonder what is the difference between these two steps? if one ...
1
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0answers
21 views
How to detect only the lane boundaries using Hough transform?
This is my code to detect the lane boundaries. But only one line(left most) is detected here. Is there a way to remove other objects from the picture (remove bushes and trees) and detect only the ...
1
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0answers
17 views
Face Landmark Detection Solution
Lately I have been working on image classification problems but just recently I tried a new type of Problem on Kaggle.
I have normalized image data(X) by dividing with 255 and also the keypoints ...
0
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0answers
21 views
ZCA: Covariance of Large Image Database
I have an overall question if my method is sound, so please bear with me in this description :).
I have a large image database and I wanted to create a preprocessing step using ZCA. The issue is that ...
4
votes
1answer
112 views
How make a python code execute on GPU not CPU
I am doing some image pre-processing using python3, as I know the code is execute on CPU, for that the process is a little bit slow, for the faster process its a good idea to make it run on GPU, ...
0
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1answer
29 views
Image features (spectral bands) other than RGB for image analysis
What features can I derive from the image, other than its RGB, to help me analyze an image?
Actually, I'm looking for some papers, etc about this. But I couldn't ...
6
votes
1answer
202 views
Finding outliers in Image dataset
I have been working on an image classification tasks for which I am extracting the image frames from the video stream collected for different classes.
I have already trained an image classification ...
0
votes
1answer
292 views
Why is Keras fit_generator different from fit?
I would like to use a custom generator so that I can implement custom augmentations on my dataset in Keras. However, I built a generic generator (without augmentation) and am confused why it is ...
7
votes
4answers
673 views
How to replace NaN values for image data?
My data set has a total of 200 columns, where each column corresponds to the same pixel in all of my images. In total, I have 48,500 rows. The labels for the data range from 0-9.
The data looks ...
0
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0answers
107 views
B-spline interpolation for image
I am looking B-spline image interpolation implementation using python library.
Like:
bicubic_interpolation = cv2.resize(image, (512, 512), interpolation = cv2.INTER_CUBIC)
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26 views
How to return batches of augmented images in an image preprocessor?
I've written the following class that generates augmented images one by one. However, I'd like to be able to generate batches of 8 images each (or any number really). The way I'm hoping to do it is:
...
3
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2answers
109 views
Why image is more blurred through PIL?
I was using PIL library to open an image and then convert it into array later on for DL operations. However I found out that image opened was blurry as opposed to the original image. Why is the image ...
2
votes
1answer
91 views
Is image sharpening a good idea for data augmentation?
I'm training segmentation networks and while the dataset is somehow decent (~5k images) I wanted to augment it, so far I'm trying:
RandomFlip
RandomRotate
RandomBrightness changes
RandomShadows
Due ...
2
votes
1answer
448 views
Why does TensorFlow convert my decoded image to float32 instead of uint8/16?
I am using the following code to import a bunch of .png images and decode them using TensorFlow:
...
1
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2answers
117 views
Crop all written letters from image to form a website
Above image has handwritten hindi / deavanagari letters all on a single
image.
Task is to Prepare a dataset from the given assignment.jpg image using image
processing tools
Idon't have clarity ...
0
votes
1answer
37 views
how many channels does ultrasound images have?
I have some ultrasound images, when I read them using cv.imread and check their shape or check them with ...
5
votes
2answers
734 views
How can I detect blocks of text from scanned document images
ORIGINAL IMAGE:
GOAL:
I want to separate texts into individual paragraphs by placing bounding boxes over them (as shown above).
I tried it do this via traditional computer vision approach using ...
4
votes
1answer
113 views
Image Matching for similar products
Is it technically possible to find out similar products online based on an given image?
Say the first link is a hoodie for women selling on Amazon. I want to do two things.
Based on the image, I ...
1
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1answer
52 views
How to determine key frames in a video for video classification?
How to detect changes between when the changes between 2 frames of videos that are significant enough to be counted for video classification? Thinking of the problem as analogous to edge detection in ...
