Heat-treated bamboo bundles (HB) are essential for producing bamboo scrimber, and their fluffing characteristics significantly affect the final product. However, limited research on quantitatively characterizing the fluffing degree of HB has hindered the performance classification, optimization of bamboo scrimber, and its application in areas such as building structures. This study introduced the grayscale image threshold segmentation to obtain eight morphological parameters and their distribution ranges for 200 HB specimens: average diameter (...