Restoration of images captured by a staggered TDI camera in the presence of mechanical vibrations

Gadi Hochman, Yitzhak Yitzhak, Norman S. Kopeika, Yair Lauber, Meira Citroen, Adrian Stern

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


Time Delay and Integration (TDI) sensors scan the image in one dimension using a rectangular sensor array that integrates multiple time-delayed exposures of the same object. Due to physical constraints the TDI sensor elements may have a staggered structure, in which the odd and the even sensors are horizontally separated. TDI image acquisition systems are usually employed in low signal to noise situations such as low light conditions or thermal imaging, or when high-speed readout is required. This work deals with analysis and restoration of images acquired by thermal staggered TDI sensors in the presence of mechanical vibrations. Vibrations during such an image acquisition process cause space variant image distortions in the scanning direction. These distortions include geometric warps (such as interlace comb effects) and blur. This situation is different from common cases where the image degradation caused by motion is modeled as space invariant and can be treated by de-convolution techniques. The relative motion at each location in the degraded image is identified from the image using a differential technique. This information is then used to reconstruct the image using projection onto convex sets (POCS) technique. A main novelty in this work is the implementation of such methods to scanned images (column-wise). Restorations are performed with simulated images and with real mechanically degraded thermal images.

Original languageEnglish
Pages (from-to)559-570
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1 Dec 2003
EventApplications of Digital Image Processing XXVI - San Diego, CA, United States
Duration: 5 Aug 20038 Aug 2003


  • Image restoration
  • Staggered TDI
  • Time Delay and Integration
  • Vibrations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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