We consider the following conjecture proposed by Cornuéjols, Guenin and Margot: every ideal minimally non-packing clutter has a transversal of size 2. For a clutter C, let C̃ denote the set of hyperedges of C which intersect any minimum transversal in exactly one element. We divide the (non-)existence problem of an ideal minimally non-packing clutter D into two steps. In the first step, we give ...

This letter deals with the problem of clutter edge detection and localization in training data. To this end, is formulated as a binary hypothesis test assuming that ranks covariance matrix are known, adaptive architectures designed based on generalized likelihood ratio to decide whether data within sliding window contains homogeneous set or two heterogeneous subsets. In design stage, we utilize...

Two experiments evaluated the effect of retinal image size on the proto-object model of visual clutter perception. Experiment 1 had 20 participants order 90 small images of random-category real-world scenes from least to most cluttered. Aggregating these individual rankings into a single median clutter ranking and comparing it to a previously reported clutter ranking of larger versions of the i...

Visual clutter denotes a disordered collection of graphical entities in information visualization. It can obscure the structure present in the data. Even in a small dataset, visual clutter makes it hard for the viewer to find patterns, relationships and structure. In this thesis, I study visual clutter with four distinct visualization techniques, and present the concept and framework of Clutter...

Abstract The performance of Space-Based Radar (SBR) to detect air or ground moving targets is influenced by earth clutter, so an effective algorithm to suppressing clutter can be designed if knowing the power and distribution of earth clutter. In this paper, the clutter model of SBR is deduced. Besides, the earth's rotation effect is taken into account and the modification to Doppler frequency ...

Mitigation of anomalous propagation clutter (AP) is an ongoing problem in radar meteorology. AP clutter routinely contaminates radar data masking weather returns causing poor data quality. The problem is typically mitigated by clutter filtering all radar data but this will also eliminate weather data at zero velocity. With the advent of fast digital receivers capable of real time spectral proce...

We present an adaptive clutter suppression method for airborne random pulse repetition interval radar by using prior knowledge of clutter boundary in Doppler spectrum. In this method, by exploiting the intrinsic sparsity, compressed sensing based on iterative grid optimization (CS-IGO) is applied to directly recover the clutter spectrum with only the test range cell instead of nonhomogeneous tr...

The influence of ground clutter contamination on the estimation of polarimetric radar parameters, horizontal reflectivity (Zh), differential reflectivity (Zdr), correlation coefficient (rhy), and differential propagation phase (fdp) was examined. This study aims to derive the critical level of ground clutter contamination for Zh, Zdr, rhy , and fdp at which ground clutter influence exceeds pred...

Recent publications have explored coherent radar detection in a compound Gaussian clutter environment with inverse gamma texture, since the latter clutter model has been validated for X-band high-resolution maritime surveillance radar clutter returns. This paper explores the development of coherent constant false alarm rate (CFAR) detectors for this scenario. In the first instance, a detector i...

An analysis is presented of the results from recent trials to gather 2.4 GHz bistatic sea clutter, and in particular, of fitting the compound K distribution model both to bistatic clutter data and to simultaneously-acquired monostatic clutter data. It is found that the K distribution provides a good fit to the bistatic data, but that the bistatic clutter is significantly less ‘spiky’ than that ...