Implementation and evaluation of discrete cosine transform based image coder

Rad se fokusira na implementaciju transformacijskog kodera slike temeljenog na diskretnoj kosinusnoj transformaciji. Kroz opis DCT-a, kvantizacije i entropijskog kodiranja, rad pruža detaljan pregled procesa transformacijskog kodiranja slike. Uz implementiranu mogućnost promjene veličine bloka i stupnja kompresije pri kodiranju, provedena je usporedba rezultata s JPEG koderom i koderom baziranim na diskretnoj wavelet transformaciji (DWT). Za evaluaciju rezultata korištene su objektivne metode ocjene kvalitete slike - PSNR, VSNR, WSNR, SSIM i UQI.The work focuses on the implementation of a transformation image encoder based on discrete cosine transformation (DCT). By describing DCT, quantization, and entropy coding, the paper provides a detailed overview of the process of transformation image coding. Along with the implemented capability of changing block size and compression ratio during encoding, a comparison of results was conducted with the JPEG encoder and a coder based on discrete wavelet transformation (DWT). Objective image quality assessment methods, including PSNR, VSNR, WSNR, SSIM, and UQI, were used for result evaluation