Which Sect, Buddhism or Taoism, do the four images of Yin and Yang belong to?

Yin and Yang is a traditional concept in ancient China, which appeared as early as the Spring and Autumn Period, and was quoted by the Book of Changes and Tao Te Ching.

The five elements are also ancient concepts, which appeared a little later, about the Warring States period;

The four images appear together with the Taiji diagram, which belongs to the Yijing category.

Yin and yang, five elements, four images and eight diagrams are all used by Taoism and Confucianism, and have been deeply integrated into the culture of China people and run through the history of China;

If you insist on dividing, Taoism is more particular, so it is Taoism.