Using PCA for digits recognition in MNIST using python
Here is a simple method for handwritten digits detection in python, still giving almost 97% success at MNIST.
Histogram matching in python
Inspired by ths question on stackoverflow.
Removing lines from ruled paper with Fourier transform.
Here is an example of a ruled paper scan with digits we want to recognize. We would like to remove the rules but keep the digits. Luckily it is possible to do so.
Vectorizing a chart(python, skimage)
Here is an image with a function chart where squares give values at specific points and they are connected with straight lines. We want to get the coordinates of vertices and connections between them and draw a vectorized image of that chart.