This paper presents an approach for identifying recaptured image based on DCT coefficients. The low frequency of an image mainly reflect such information as texture and profile details. The difference between real live face images and recaptured images can be described by the low frequency of DCT coefficients. Characterized by the features of the simple and low complexity, DCT Transformation ca...

This paper describes the implementation of a Quantized Discrete Transform algorithm (QDCT) for an H.26L test model. The QDCT is used for both MPEG and H.263 video coding [1]. The MPEG and H.263 coding are based on fractional 8x8 blocks. The new H.26L video standard uses a residue transform that is based on a 4x4 block and an integer transform. Several implementations of the QDCT are proposed in...

A new integer 4 · 4 transform is adopted in the new video coding standard H.264/AVC. It consumes a big account of computation of a real-time encoder. To reduce the computation load of the new transform, pruned DCT algorithm is applied. To avoid serious encoding performance loss, a new condition is derived based on statistical sum of absolute value test(SSAVT) to identify pruned block adaptively...

Post-processing of PIV (particle image velocimetry) data typically contains three following stages: validation of the raw data, replacement of spurious and missing vectors, and some smoothing. A robust post-processing technique that carries out these steps simultaneously is proposed. The new all-in-one method (DCT-PLS), based on a penalized least squares approach (PLS), combines the use of the ...

This study examines the collective use of the electronic information and communication channels and their impact on citizen participation for public discourse. Using both quantitative and qualitative research methods, we investigate public communication channels available for government service provision in a large metropolis in China. Specifically, four electronic communication channels are an...

The present study compares two measures most frequently used to assess pragmatic competence: Written Discourse Completion Tasks (WDCT) and Oral Discourse Completion Tasks (ODCT). The study focuses on these two speech act data collection methods and explores the validity of using different forms of Discourse Completion Tasks (DCTs) in non-Western contexts. Twenty four Iranian university students...

Moving picture experts group (MPEG)-4 visual conformance standard specifies methods to verify whether bitstreams and decoders meet the requirements at a specified profile and level. The test of decoders can be divided into two parts: static and dynamic tests. The static test can be performed by comparing images from a decoder under test with those from a reference decoder using various test bit...