A Node.js application to process large images. This module resizes given images into images with lower resolution. Then for each resized image, a set of tiles is created.
To install the dependencies, run:
npm install
To generate tiles from source images, run the command:
npm start [filename1] [filename2]
filenames are the strings of image paths. If the images are located inside the project directory, relative file path should work. Otherwise, absolute file path of the images is needed.
Jest testing framework is used to test this project. To run test, run the command:
npm test
Tests whether the script creates the appropriate number of levels according to the image size. Number of levels, L should follow the following equation:
L = 1 + log2(max(imageWidth, imageHeight))
Each tile size is 256x256 pixels, unless the original image is smaller than 256x256 or its an edge tile. This test calculates the number of tiles that can be created from a specific image and compare that with the tiles created in each level directory.
Run the command:
npm run additional-test
This command will create a directory in the project called "test_images". This directory will contain full images patched from the tiles of each level. The coordinates of the tiles are obtained from each tile name x_y.jpg where x and y indicate the coordinates of the tile's starting position. The name of the patched image will indicate its level. The result images indicate whether all the tiles create the original full image properly.
- Nishat Shama