I'm currently doing research in image processing using tensors, and I found that many test images repeatedly appear across related literature. They include: Airplane, Baboon, Barbara, Facade, House, Lena, Peppers, Giant, Wasabi, etc. However, they are not referenced with a specific source. I found some of them from the SIPI dataset, but many others are missing. I'm wondering if there are "standards" for the selection of test images, and where can the standardized images be found. Thank you!