Digit-Recognition | Recognize handwritten digits using back-propagation | Machine Learning library
kandi X-RAY | Digit-Recognition Summary
kandi X-RAY | Digit-Recognition Summary
Recognize handwritten digits using back-propagation algorithm on MNIST data-set
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Top functions reviewed by kandi - BETA
- Train the network
- Calculate the derivative of a linear function
- Prints a progress bar
- Nonlinear function
- Test network connectivity
- Load MNIST dataset
Digit-Recognition Key Features
Digit-Recognition Examples and Code Snippets
Community Discussions
Trending Discussions on Digit-Recognition
QUESTION
I am working on a problem, where I want to automatically read the number on images as follows:
As can be seen, the images are quite challenging! Not only are these not connected lines in all cases, but also the contrast differs a lot. My first attempt was using pytesseract after some preprocessing. I also created a StackOverflow post here.
While this approach works fine on an individual image, it is not universal, as it requires too much manual information for the preprocessing. The best solution I have so far, is to iterate over some hyperparameters such as threshold value, filter size of erosion/dilation, etc. However, this is computationally expensive!
Therefore I came to believe, that the solution I am looking for must be deep-learning based. I have two ideas here:
- Using a pre-trained network on a similar task
- Splitting the input images into separate digits and train / finetune a network myself in an MNIST fashion
Regarding the first approach, I have not found something good yet. Does anyone have an idea for that?
Regarding the second approach, I would need a method first to automatically generate images of the separate digits. I guess this should also be deep-learning-based. Afterward, I could maybe achieve some good results with some data augmentation.
Does anyone have ideas? :)
...ANSWER
Answered 2021-Feb-22 at 22:53Your task is really challenging. I have several ideas, may be it will help you on the way. First, if you get the images right, you can use EasyOCR. It uses a sophisticated algorithm for detecting letters in the image called CRAFT and then recognizes them using CRNN. It provides very fine grained control over symbol detection and recognition parts. For example, after some manual manipulations on the images (greyscaling, contrast enhancing and sharpening) I got
QUESTION
I'm completely new to machine learning and I wanted to start with a fairly easy project: the digit recognition using the mnist data set. I'm using keras and tensorflow and I started using code I found here.The network is built and trained correctly and I now want to make a simple prediction. For starters I simply used one of the pictures in the part of the data set meant for testing and I would like my output to be that number. (In this case the output is supposed to be 7.) Here's my code:
...ANSWER
Answered 2019-Dec-05 at 23:55ompletely new to machine learning and I wanted to start with a fairly easy project: the digit recognitiors I simply used
QUESTION
I am trying to write a simple character recolonization code using convolutional neural network in python on windows. I am following this tutorial. But somehow I am having following error message. I could not find the appropriate reason of this error. It would be helpful for me if anyone can breakdown the error with probable solution.
...ANSWER
Answered 2019-Feb-10 at 19:41Check import tensorflow.keras...
or import keras...
Keras switched to tensorflow.keras
, which is a part of tensorflow>=1.10.0.
Maybe it will help.
QUESTION
I am trying to locate rectangles in an image, and apply a classifier to recognize numbers inside each one, using a previously trained classifier:
...ANSWER
Answered 2019-Feb-09 at 19:11This happens when you copy code.
Steps to solution
1) If you copy code, try to understand what is happening
2) Realize that copying code is not magical. It simply doesnt have to work everywhere
3) If there is error, google the error and try to find out why the error happens
4) If you copy code from tutorial and it doesnt work, dont ask at StackOverflow
5) Your problem is on the lines
QUESTION
I am trying to extend a basic classification model (https://machinelearningmastery.com/handwritten-digit-recognition-using-convolutional-neural-networks-python-keras/) to a simple object detection model for single objects.
The classification model simply classifies handwritten digits in images where the digit fills most of the image. To make a meaningful dataset for the object detection I use the MNIST dataset as base and transform it into a new dataset by the following steps
- Increase the image canvas size from 28x28 to 100x100
- Move the handwritten digit to a random position within the 100x100 image
- Create a ground truth bounding box
Figure 1: Illustration of step 1 and 2.
Figure 2: Some produced ground truth bounding boxes.
The output vector from the model is inspired by the YOLO definition but for a single object:
...ANSWER
Answered 2018-Nov-30 at 13:37The first dimension of all tensors is the batch size.
Your loss should probably be working in the second dimension:
QUESTION
I am new to Deep Learning and am using Keras to learn it. I followed instructions at this link to build a handwritten digit recognition classifier using MNIST dataset. It worked fine in terms of seeing comparable evaluation results. I used tensorflow as the backend of Keras.
Now I want to read an image file with a handwritten digit and predict its digit using the same model. I think the image needs to be transformed to be in 28x28 dimension with 255 depth first? I am not sure whether my understanding is correct to begin with. If so, how can I do this transformation in Python? If my understanding is incorrect, what kind of transformation is required?
Thank you in advance!
...ANSWER
Answered 2017-Aug-07 at 17:58To my knowledge, you will need to turn this into a 28x28 grayscale image in order to work with this in Python. That's the same shape and scheme as the images that were used to train MNIST, and the tensors are all expecting 784 (28 * 28)-sized items, each with a value between 0-255 in their tensors as input.
To resize an image you could use PIL or Pillow. See this SO post or this page in the Pillow docs (linked to by Wtower in the previously mentioned post, copied here for ease of accesson resizing and keeping aspect ratio, if that's what you want to do.
HTH!
Cheers,
-Maashu
QUESTION
My goal is to classify MNIST handwritten digits using keras. I am trying to reproduce the results from this website.
When creating the model ("model = baseline_model()"), I get the error message AssertionError: Keyword argument not understood: kernel_initializer
Do you know how to solve this issue ? I am using keras 1.1.1 with theano back-end
...ANSWER
Answered 2017-Apr-06 at 16:11As it's mentioned in a comment at the beginning of an article - this is a version for keras 2.0.2
, so in order to make this example working you need to use this version of Keras
.
QUESTION
I want to ask for suggestion on how to solve the problem of tesserocr did not recognize certain line from an image.
This is the image. source is from Simple Digit Recognition OCR in OpenCV-Python
The code
...ANSWER
Answered 2017-Mar-30 at 06:58It's correctly recognized with Tesseract 4.00.00alpha
with default psm 3
and oem 3
modes. Below is the result.
Suggest to upgrade tesseract
to v4.0
with your tesserocr
if you are still using v3.x
.
EDIT:
To upgrade
tesserocr
to supportv4.00.00.alpha
, check this "Is any plan to porting tesseract 4.0 (alpha)" issue page. There are guidelines to make it works.
QUESTION
I'm completely new to keras and to get started, I'm trying to follow this tutorial. I use theano backend. Sadly, I already encounter a difficulty at this line:
...ANSWER
Answered 2017-Mar-21 at 20:13I solved it by simply doing a complete reinstallation. Perhaps, there was something messed up with the old one. For Windows users I strongly recommend this tutorial: http://efavdb.com/gpu-accelerated-theano-keras-with-windows-10/
QUESTION
I have a simple digit recognition project and have noticed that people generally use two approaches when doing so in Python. My goal is to input a PDF document and get the HANDWRITTEN digits in particular places of the page.
I saw that people either use opencv
, as in this question, or scikitlearn
, as is seen in this example. I am not familiar with either, and am wondering which one would be most simple to learn and implement, given my intended usage. Thanks.
ANSWER
Answered 2017-Mar-10 at 00:30I suggest that you should use both opencv
and scikitlearn
. After you turn your pdf into an image, you can use opencv
for image pre-processing (Gaussian Blur, thresholding, Erosion/Dilation Filters), so that the digits will become more easy to extract. Then you can use contour tracing (again opencv
) to detect the individual digits. After you have extracted your digits (and given that you have a training set), you can use scikitlearn
for the classification.
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Install Digit-Recognition
You can use Digit-Recognition like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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