Image Processing

• CMake based projects related to Image Processing
• Written in C++
• Parallelised using std::thread and / or Nvidia CUDA
• Unit tests written for Google Test framework
• All project support following input image formats:
  • RAW
  • Bitmap (.bmp)
  • Graphics Interchange Format (.gif)
    • NOTE: only limited support
  • Portable Network Graphics (.png)
    • NOTE: not the whole standard is supported, scroll down for list of unsupported features.
• Projects overview:
  • Common library (shared functionality)
  • DCT Image compression
  • Convolution Filter
  • Image Viewer

Common

Static library containing shared functionality

BitmapLoader

• Loads image data from bitmap (.bmp) file

BitStream

• Simplifies access to bits from byte arrays
• Handles moving in stream

CommandLineParser

• Parses command line arguments
• Creates key-value pairs of command line option and its argument list

Exception (and RuntimeException)

• Exception for differentiating between project exceptions and standard exceptions

GifLoader

• Loads gif image
• Limmited support
  • Animation is not supported
• Referencess:
  • gif blog

Image

• Contains ability to get and set particular pixel

ImageLoader

• Loads requested image
• Checks content to determine which image format is used

Pixel

• Represents pixel
• Enables conversion to:
  • RGB
  • RGBA
  • YCbCr

PngLoader

• PNG image decoder
• Referencess:
  • PNG Specification
  • RFC 1950 "ZLIB Compressed Data Format Specification"
  • RFC 1951 "DEFLATE Compressed Data Format Specification"
• Unsupported features:
  • Indexed color is not supported.
  • Interface method ADAM7 is not supported
  • Only 8 bit channels are supported
  • Zlib/Inflate block type 00 is not supported (uncompressed block)

RawLoader

• Loads image data from RAW image file

Window

• Displaying images based on their starting position:
  • First Pixel being top left
  • First Pixel being bottom left
• Keyboard and joystick / gamepad inouts are supported
• Arrow keys, WASD and joystick for moving image
• Zoom in and out:
  • + and RT (Right Trigger) to zoom in;
  • • and LT (Left Trigger) to zoom out;

Compression

• Simplified loosy jpeg compression algorithm (DCT - Discrete Cosine Transform method)
• Parallelised using C++'s std::thread

3% Quality

10% Quality

95% Quality

Convolution Filter

• Application for applying convolution filter on input image
• Parallelised using:
  • Nvidia CUDA (if supported) or
  • C++'s std::thread
• Displays result in a winfow
• Uses strategy pattern to handle commandline arguments

Sharpen

Sobel

Image Viewer

• Application for displaying raw, bmp and png images
• Uses strategy pattern to handle commandline arguments