Adaptive Dynamic Range Reduction for SAR Images
نویسندگان
چکیده
The visualization of SAR images involves the mapping of high dynamic range amplitude values to gray levels for lower dynamic range display devices. This dynamic range reduction process determines the visibility of details in the displayed result. It is therefore an important part of SAR visualization systems. The problem of dynamic range reduction for SAR images is related to the tone mapping problem for optical images. Tone mapping is used to prepare high dynamic range optical images for display on lower dynamic range display devices. In this paper, we present new dynamic range reduction methods for SAR images. The methods are based tone mapping techniques. They are adaptive, improve the visibility of local details, and are suitable for use in interactive visualization systems.
منابع مشابه
Compression Method for High Dynamic Range Intensity to Improve SAR Image Visibility
It is possible to interpret the shape of buildings based on synthetic aperture radar (SAR) images acquired using airborne SAR systems. However, the pixel values of SAR images have high dynamic range intensity, and SAR images are not displayable without dynamic range intensity compression. We therefore have developed a dynamic range intensity compression method suitable for SAR image features. U...
متن کاملSar Raw Data Compression with Dct-baq
In this study Synthetic Aperture Radar (SAR) raw data compression techniques are introduced. Two encoding approaches are generally used. Direct encoding in spatial domain and transform encoding in transform domain. A well-known spatial domain compression technique is based on Block Adaptive Quantization (BAQ)[3,6]. BAQ encoding is implemented by dividing the SAR Raw data set into data blocks of...
متن کاملRestoration of Saturated SAR Data
Synthetic aperture radar (SAR) is an imaging technique, which provides high-resolution images. The high resolution in the range direction is achieved by using large bandwidth signals and that in the azimuth direction is achieved by synthesizing a large aperture antenna using platform motion. The unique data collection geometry of SAR system requires that huge amounts of raw data be processed be...
متن کاملWavelet Packet and TCQ Coding for SAR Raw Data Compression
Synthetic aperture radar (SAR) is an imaging system which provides high resolution images of earth surface. The high resolution in the range direction is achieved by using large bandwidth signals and that in the azimuth direction is achieved by synthesizing a large aperture antenna using platform motion. The unique data collection geometry of SAR system requires that huge amounts of raw data be...
متن کاملSpeckle Reduction in Synthetic Aperture Radar Images in Wavelet Domain Using Laplace Distribution
Speckle is a granular noise-like phenomenon which appears in Synthetic Aperture Radar (SAR) images due to coherent properties of SAR systems. The presence of speckle complicates both human and automatic analysis of SAR images. As a result, speckle reduction is an important preprocessing step for many SAR remote sensing applications. Speckle reduction can be made through multi-looking during the...
متن کامل