Fig. 5

Distribution maps of cellulose, hemicellulose and lignin contents in different biofuel pellets. a Original biofuel pellet NIR images; b prediction map of different lignocellulose components. The numbers accompanying each sample represent the respective lignocellulose component content. The three color-scale bars were generated with different cellulose, hemicellulose and lignin contents from small to large, shown in different colors from blue to red