1. A computer-implemented method for intervertebral disc alignment comprising: providing a spine image and a click point on the spine image; applying an adaptive thresholding technique to segment vertebrae regions at the click point from the spine image; filtering segmented vertebrae regions with a morphological operation; estimating a multi-scale orientation field from filtered segmented vertebrae regions; extracting an intervertebral disc region by applying region growing for each scale; integrating the multi-scale orientation field in a locally segmented intervertebral disc region based on the intervertebral disc region; estimating a disc centerline traversing a spinal axis from the filtered segmented vertebrae regions; and fusing an integrated multi-scale orientation field with the disc centerline based on associated confidence measures to provide an intervertebral disc alignment.