This standard is a crucial method for evaluating the quality of transparent or semi-transparent polypropylene resins and films, primarily assessing the purity and uniformity of the resin by measuring the number of "fish eyes," commonly known as "gel particles." The standard provides two core technical approaches: Method A (Projector Method) and Method B (Dynamic Image Analysis Method). Method A is an offline detection method that requires the use of a projector with a magnification of no less than 8x and an observation plate with a standard aperture (e.g., Φ0.8mm) to count the fish eyes in static film samples. Method B, on the other hand, is suitable for online dynamic monitoring during the film casting process, with its core involving the use of an image acquisition and analysis system for real-time detection and image analysis of continuously moving films.