Image Enhancement and Display Techniques Applied to SAR580 Images of Ships
Abstract
At radar wavelengths, a ship appears as a collection of smooth sheets arranged to form flat plates, di- and trihedral corner reflectors are very large, and tend to The returns from the corner reflectors are very large, and tend to dominate ....returns from weaker reflectors in the image. The dynamic range of the image can be as high as 90 dB. Such an image is difficult to display on the limited dynamic range of a display device, as the quantization effects of the device tend to obscure detail coming from lower brightness level regions of the image. In order to investigate the role played by weaker scatterers in image interpretation, enhancement, techniques that emphasize lower level returns in relation to dominant targets can be applied to the images. This report discusses the properties of SAR ship returns, reviews the various image enhancement techniques applied to the images, and gives examples of enhanced ship imagery. Detail in the enhanced images is compared to actual structural detail in the ships being imaged. This comparison ensures that the desired effect is being obtained. The us of ship axis profiles as a non-image enhancement method of improving operation performance in ship identification and classification is also described.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1987
- Accession Number
- ADA187958
Entities
People
- M. R. Vant
- M. T. Rey
Organizations
- Communications Research Centre Canada