Which of the following is not used to represent the region of an object in an…

Run-length coding and quad tree coding are standard region representation methods in image processing. They describe the pixels belonging to a region (either as runs or as hierarchical blocks). Chain code is mainly a boundary/contour representation method for an object’s shape, and is still used to represent objects/regions via their borders. Projection is used for feature extraction (e.g., horizontal/vertical profiles) rather than encoding a region itself. इसलिए region representation के लिए projection का उपयोग नहीं होता। इसलिए सही उत्तर है: Projection