boyleerock/computer-vision

This repo contains many of the image preprocessing techniques for the computer vision.

Computer-Vision

In the image_filter folder:

(1). processing_tool.py inculdes:

1. load(img_path) -> load an image from a file path

2. print_stats(image) -> Prints the height, width and number of channels in an image.

3. crop(image, start_row, start_col, num_rows, num_cols) -> Crop an image based on the specified bounds. Use array slicing.

4. change_contrast(image, factor)-> Change the value of every pixel by following

                                    x_n = factor * (x_p - 0.5) + 0.5
   

   where x_n is the new value and x_p is the original value. Assumes pixel values between 0.0 and 1.0 If you are using values 0-255, change 0.5 to 128.

5. resize(input_image, output_rows, output_cols) -> Resize an image using the nearest neighbor method.

6. greyscale(input_image) -> Convert a RGB image to greyscale.

(2). convolution.py inculdes:

1. conv2D(image, kernel) -> Convolution of a 2D image with a 2D kernel.
2. test_conv2D(): -> A simple test for your 2D convolution function.
3. conv(image, kernel) -> Convolution of a RGB or grayscale image with a 2D kernel
4. gauss2D(size, sigma) -> Function to mimic the 'fspecial' gaussian MATLAB function.
5. corr(image, kernel) -> Cross correlation of a RGB image with a 2D kernel