PT Journal AU Henry Velesaca Patricia Suarez Raul Mira Angel Sappa TI Computer Vision based Food Grain Classification: a Comprehensive Survey SO Computers and Electronics in Agriculture JI CEA PY 2021 BP 106287 VL 187 AB This manuscript presents a comprehensive survey on recent computer vision based food grain classification techniques. It includes state-of-the-art approaches intended for different grain varieties. The approaches proposed in the literature are analyzed according to the processing stages considered in the classification pipeline, making it easier to identify common techniques and comparisons. Additionally, the type of images considered by each approach (i.e., images from the: visible, infrared, multispectral, hyperspectral bands) together with the strategy used to generate ground truth data (i.e., real and synthetic images) are reviewed. Finally, conclusions highlighting future needs and challenges are presented. ER