  In surveillance, accurately recognizing license plates is hindered by their
often low quality and small dimensions, compromising recognition precision.
Despite advancements in AI-based image super-resolution, methods like
Convolutional Neural Networks (CNNs) and Generative Adversarial Networks (GANs)
still fall short in enhancing license plate images. This study leverages the
cutting-edge diffusion model, which has consistently outperformed other deep
learning techniques in image restoration. By training this model using a
curated dataset of Saudi license plates, both in low and high resolutions, we
discovered the diffusion model's superior efficacy. The method achieves a
12.55\% and 37.32% improvement in Peak Signal-to-Noise Ratio (PSNR) over SwinIR
and ESRGAN, respectively. Moreover, our method surpasses these techniques in
terms of Structural Similarity Index (SSIM), registering a 4.89% and 17.66%
improvement over SwinIR and ESRGAN, respectively. Furthermore, 92% of human
evaluators preferred our images over those from other algorithms. In essence,
this research presents a pioneering solution for license plate
super-resolution, with tangible potential for surveillance systems.
