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Sprites Detection

A sprite is a small raster graphic (a bitmap) that represents an object such as a character, a vehicle, a projectile, etc.

Sprite Sheet

It is not uncommon for games to have tens to hundreds of sprites. Loading each of these as an individual image would consume a lot of memory and processing power. To help manage sprites and avoid using so many images, many games use sprite sheets (also known as image sprites).

A sprite sheet consists of multiple sprites in one image. In other words, sprite sheets pack multiple sprites into a single picture. Using sprite sheet, video game developers create sprite sheet animation representing one or several animation sequences while only loading a single file:

Metal Slug Sprites

Sprite Bounding Box

A frame (bounding box) can be used to delimit the sprite in the sprite sheet. This bounding box is defined with two 2D points top_left and the bottom_right, which their respective coordinates x and y are relative to the top-left corner of the sprite sheet's image.

For example:

Shape Bounding Boxes

Sprite Mask

The mask of a sprite defines the 2D shape of the sprite. For example, the sprite sheet metal_slug_sprite_standing_stance.png contains the 3 following sprites:

Metal Slug Standing Stance

The masks of these sprites are respectively:

Aim of the project

  • Detect sprites packed in an image (sheet) and draw their masks and bounding boxes into a new image with the same size of the original image.
  • Present a 2D map of all the the sprites with their labels.

Waypoint Delivered:

  • Waypoint 1: Find the Most Common Color in an Image
  • Waypoint 2: Write a Class Sprite
  • Waypoint 3: Find Sprites in an Image
  • Waypoint 4: Draw Sprite Label Bounding Boxes
  • Waypoint 5: Write a Class SpriteSheet

Usage Information

Prerequisites

  • Python 3.7 is required.
  • numpy (python support library)
  • PIL.Image (python support library)

Usage

  • Use git to clone the link to your local directory.
  • Change the your current working directory to where you git the project.
  • Open terminal and type pipenv install -e Pipfile to install virtual environment.
  • For example:
>>> from spriteutil import *
>>> sprite_sheet = SpriteSheet('Barbarian.gif')
>>> sprites, labels = sprite_sheet.find_sprites()
>>> len(sprites)
39
>>> # Create the mask image with bounding boxes.
>>> image = sprite_sheet.create_sprite_labels_image()
>>> image.save('barbarian_bounding_boxes.png')

Contact Information

  • If you have any problems using this library, please use the contact below.
    Email: cuong.nguyen@f4.intek.edu.vn

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