A Generalized Description for the Perceived Contrast of Image Elements

Abstract

In this paper, the problem of assessing the perceived contrast of image elements for no-reference measurement of the global contrast of complex (multi-element) images is considered. A new method for assess the perceived contrast of elements of complex image is proposed on the basis of measuring of the contrast of these elements on a prenormalized image with subsequent correction of the contrast value taking into account the dynamic range of the primary (original) image. A new generalized description of the perceived contrast of the image elements for different definitions of the contrast kernel is suggested. New definitions of the weighted and relative contrast of the image elements are proposed. A comparative analysis of the proposed and known definitions of the weighted and relative contrast of image elements was carried out.

Refocusing of Moving Ships in Squint SAR Images Based on Spectrum Orthogonalization

“…The synthetic aperture time to the image target was short enough so that the effective rotation of the target could be regarded as constant. The image contrast [40] and entropy…”

“…The synthetic aperture time to the image target was short enough so that the effective rotation of the target could be regarded as constant. The image contrast [40] and entropy [19] of the image intensity were used to compare the imaging results. The rough image of the ship collected by the GaoFen-3 satellite through the BP integral in the squint model is smeared, as shown in Figure 13a.…”

“…According to (40), we can correct the inclination of the 2-D wavenumber spectrum and remove its cross-range-dependent RCM.…”