Facile Alignment Estimation in Carbon Nanotube Films Using Image Processing

•We propose a novel image processing framework based on a total variation-based image decomposition algorithm to estimate the CNT orientation distribution.•We demonstrate CNT spatial orientation in films using scanning electron micrographs.•Local and global nanotube orientation can be acquired at a fast rate with simplicity.•We employ a Fourier subtraction technique to discard unwanted alignment information arising from holes, cracks, and contaminants.