This paper addresses the problem of wide dynamic range scenes and presents a new method of compressing the dynamic range of wide dynamic range scenes. This method is based on the Multiscale Retinex Algorithm. The paper presents the performance of the Multiscale Retinex Algorithm on wide dynamic range pictures. Two modifications that enhance the results obtained with the original Multi Scale Ret...

The MODerate resolution Imaging Spectrometer (MODIS) is consisted of cross-track scan mirror and linear arrays of ten detectors. Because 1) the abnormal behavior of the response of each detector, 2) optical cross–talk and shortwave infrared thermal leak, and 3) reflectance, emissivity, or polarization of each scan mirror side are the cause of artificial strips appearing in the images. The histo...

The likelihood-based approach to density modification [Terwilliger (2000), Acta Cryst. D56, 965-972] is extended to include the recognition of patterns of electron density. Once a region of electron density in a map is recognized as corresponding to a known structural element, the likelihood of the map is reformulated to include a term that reflects how closely the map agrees with the expected ...

In this paper, a complete functional testing of embedded ADC is presented. The integral non-linearity error, INLE, differential non-linearity error, DNLE, offset error, OSE, gain error and the signal-to-noise ratio, SNR are tested. The problem related to the propagation of the analog signal to the input of the ADC and the observation of the digital output of the converter at the output of the d...

In view of the phenomenon that data-hiding algorithm is easy to be detected by inspecting tool SPAM when carrying information, random insertion and histogram modification are adapted in the data hiding. A data-reversible hiding algorithm in WSNs is put forward. By collecting and referring sub-graph, calculating data fusion algorithm that can protect the data’s completion and privacy and analyzi...

This paper presents a method for reducing noise in a digital hologram, which occurs during acquisition. The algorithm proposed initially transforms a digital hologram into frequency-domain data through a discrete cosine transform (DCT), and separates the object from the background in the transformed image. As a noise reduction method, a histogram modification method is applied to the object, wh...

This paper introduces approximate image message authentication codes (IMACs) for soft image authentication. The proposed approximate IMAC survives small to moderate image compression and it is capable of detecting and locating tampering. Techniques such as block averaging and smoothing, parallel approximate message authentication code (AMAC) computation, and image histogram enhancement are used...