Recently, Tsai presented an efficient algorithm which uses the ratio value of hue over intensity to construct map for detecting shadows color aerial images. Instead only using global thresholding process in Tsai's algorithm, this paper presents a novel successive scheme (STS) detect more accurately. In our proposed STS, modified map, is obtained by applying exponential function Tsai, stretch gap between values shadow and nonshadow pixels. By performing on coarse-shadow constructed classify...

The inverse halftoning algorithm is used to reconstruct a gray image from an input halftone image. Based on the recently published lookup table (LUT) technique, this paper presents novel edge-based LUT method for which improves quality of reconstructed proposed first uses LUT-based as preprocessing step transform given base image, and then edges are extracted classified According these edges, built up set 30 real training images with both low-and high-frequency contents, experimental results...

Error concealment plays an important role in robust video transmission. Recently, Chen and Leung presented efficient data hiding-based (DH-based) approach to recover corrupted macroblocks from the intra-frame of H.264/AVC sequence, but it suffers quality degradation problem. Since quantized discrete cosine transform coefficients sequence tend form a Laplace distribution, we therefore propose reversible DH-based for error based on this characteristic. Our design is able achieve no...

For point cloud registration, the purpose of this paper is to propose a novel centralized RANSAC (C-RANSAC) registration with fast convergence and high accuracy. In our algorithm, contributions are (1) proposal scale histogram-based outlier removal delete outliers from initial line vector set <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mathbf {L}$</tex-math></inline-formula> for constructing reduced...

The Householder (1968) transform is very useful in matrix computations and signal processing. A straightforward derivation for a complex given. It needs fewer operations when compared with the previous results by Venkaiah et al. (1993) Xia Suter (see Digital Signal Process., vol.5, p.116-17, 1995). We also investigate applying our result to of hyperbolic transform.

To save manufacturing cost, most color digital video cameras employ a single-sensor technology with red-green- blue (RGB) filter array (CFA) to capture real-world scenes. Due only one primary measured at each pixel location, the captured videos are usually referred as mosaic videos. For purposes of economical storage and transmission, it is very important achieve good tradeoff between quality bitrate when compressing different RGB-CFA structures. In this paper, based on mathematical...

Efficient data hiding algorithms have been developed for video coders such as MPEG-4 and H.264/AVC, to deliver embedded information. Lin et al. proposed an error propagation free discrete cosine transform (DCT) based algorithm in H.264/AVC intra-coded frames. However, the state-of-the-art codec, high efficiency coding (HEVC), adopts both DCT sine (DST) that previous cannot afford fully utilize available capacity under HEVC framework. We investigate block DST coefficient characteristics...

In this paper, we propose a novel and effective hybrid method, which joins the conventional chroma subsampling distortion-minimization-based luma modification together, to improve quality of reconstructed RGB fullcolor image. Assume input full-color image has been transformed YUV image, prior compression. For each 2×2 UV block, one 4:2:0 is applied determine subsampled U V components, Us Vs. Based on Us, Vs, corresponding original main theorem provided ideally modified block in constant time...

In this paper, we propose a universal chroma subsampling strategy for compressing mosaic video sequences with arbitrary red-green-blue (RGB) color filter arrays (CFAs), which are widely used in the single sensor imaging pipeline, H.264/AVC. We first develop modified demosaicing scheme, specifically recovers G component difference domain, to recover missing components input image frames. Then, based on transform between RGB and YUV spaces, proposed automatically samples, by considering...