OBJECTIVE To evaluate prospectively the diagnostic accuracy of the thyroid imaging reporting and data system (TI-RADS) and its interobserver agreement and to estimate the reduction of indications of fine-needle aspiration biopsies (FNABs). DESIGN A prospective comparative study was designed. METHODS In 2 years, 4550 nodules in 3543 patients were prospectively scored using a flowchart and a ...

The segmentation is the technique that is used to locate the objects of interest, partitioning the foreground from background. In other words segmentation is a procedure to group spatially adjacent image pixels into segments. Many research of the field is only for gray image. However, with the improvement of computer processing capabilities and the increased application of color images, the col...

Texture classification is an active topic in image processing which plays an important role in many applications such as image retrieval, inspection systems, face recognition, medical image processing, etc. There are many approaches extracting texture features in gray-level images such as local binary patterns, gray level co-occurence matrixes, statistical features, skeleton, scale invariant fe...

The present investigation compares performance of two objective video quality metrics in predicting the visual threshold for the detection of blocking impairments associated with MPEG-2 compression. The visibility thresholds for both saturated color and gray-scale targets are measured. The test material consists of image sequences in which either saturated color or gray-scale targets exhibiting...

A novel segmentation method based on wavelet transform is presented for gray matter, white matter and cerebrospinal fluid in thin-sliced single-channel brain magnetic resonance (MR) scans. On the basis of the local image model, multicontext wavelet-based thresholding segmentation (MCWT) is proposed to classify 2D MR data into tissues automatically. In MCWT, the wavelet multiscale transform of l...

A method for detecting human faces in color images is described that first separates skin regions from nonskin regions and then locates faces within skin regions. A chroma chart is prepared via a training process that contains the likelihoods of different colors representing the skin. Using the chroma chart, a color image is transformed into a gray scale image in such a way that the gray value ...

In the study of the transition dynamics, we found that the reflectance of bistable cholesteric displays depended on the addressing sequence of the bipolar pulses. Two different pulse amplitudes corresponding to the high and low voltages about the quiescent point were chosen. By a proper permutation of such pulses, the final reflectance of even difference could be obtained for gray-scale display...

Compression efficiency of encrypted real-world sources such as images can be improved by exploiting source dependency. Lossless compression of encrypted images can be achieved through SlepianWolf coding. In this correspondence, we propose a resolution progressive compression scheme which compresses an encrypted image progressively in resolution, such that the decoder can observe a lowresolution...

Associative memories (AMs) are mathematical models inspired by the human brain ability to store and recall information. This paper introduces the fuzzy exponential recurrent neural networks (FERNNs), which can implement an AM for the storage and recall of fuzzy sets. The novel models are obtained by modifying the multivalued exponential recurrent neural network of Chiueh and Tsai. Briefly, a FE...

Detection of facial features such as eye, nose, and mouth is an important step for many subsequent facial image analysis tasks such as face recognition. In this paper, we introduce a method to detect eye and nose fields from gray scale facial images. The Independent Components Analysis (ICA) is utilized to learn the appearance and shape of the facial feature. The regions with high response to t...