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Motion JPEG simply compresses each frame in a video sequence using JPEG still image compression standard. This video codec satisfies power consumption and real-time properties of embedded systems while having very low complexity. However, the downside is its inefficiency in reducing the bit-rate because there are still redundancies between encoded frames. In this paper, we focus on reducing temporal...
We focus on the road-to-vehicle visible light communication that system is composed of LED matrix as transmitter and high-speed camera as receiver. Conventionally, the transmitting rate has been reduced to half of the frame rate of the camera, to avoid intersymbol interference because of exposure time of camera frame. We propose a method to improve the communication rate. The transmitting rate is...
We propose an image estimation method by using header information in JPEG 2000 codestreams. Some information is directly extracted from header parts, and is used to estimate an original image without using any body data. From the estimated images, image signature values, which are utilized in MPEG 7 for image retrieval or image identification, are calculated as an image similarity index. Moreover,...
It is an important issue to design wireless communication and networking that radio resources should be efficiently utilized while providing guaranteed Quality of Service (QoS). In this area, link adaptation based on accurate channel quality estimation has attracted a lot of attention from both academia and industry. Topics such as power control, adaptive modulation and adaptive rate coding are under...
A 12-bit algorithmic (cyclic) ADC is designed and fabricated in 90nm CMOS, and only occupies as small active area as 0.037mm2. With the proposed radix-value self-estimation scheme for a non-binary 1-bit/step architecture, the accuracy requirement on analog components is largely relaxed. Therefore, the implementation of analog circuits such as amplifier and comparator becomes simple, and high-density...
Program slicing is used as a basis for an approach to estimate maintenance effort. A case study of the GNU Linux kernel with over 900 versions spanning 17 years of history is presented. For each version a system dictionary is built using a lightweight slicing approach and encodes the forward decomposition static slice profiles for all variables in all the files in the system. Changes to the system...
Multimedia playback programs must satisfy certain hard real-time constraints to give their user a pleasant viewing experience. Having a tight estimation on the worst case execution time (WCET) is essential for the resource scheduler to ensure all the tasks in the system can satisfy their timing requirements while maintaining good system resource utilization. In this paper we present a detailed hybrid...
Methods based on Local Binary Patterns have been used successfully in a wide range of texture classification tasks. A restriction shared by all methods based on Local Binary Patterns is the high sensitivity to signal scale. In recent work we presented a general framework for scale-adaptive computation of Local Binary Patterns, improving the accuracy in texture classification scenarios involving varying...
Video compression plays an important role in mobile applications, because more and more people use video to communicate with each other (like video call etc). However, the resources (energy, memory etc.) on mobile devices are limited, thus how to achieve a high coding performance in these devices becomes a big challenge. The recent standards such as H.264, HEVC and audio video coding standard (AVS)...
Video coding technique with a background frame, extracted from mixture of Gaussian (MoG) based background modeling, provides better rate distortion performance by exploiting coding efficiency in uncovered background areas compared to the latest video coding standard. However, it suffers from high computation time, low coding efficiency for dynamic videos, and prior knowledge requirement of video content...
The present paper focuses on the extraction and evaluation of salient audiovisual features for the prediction of the encoding requirements in multimedia learning content. Decisions over audiovisual encoding are related to the perceived quality of experience (QoE), but also to the physical attributes of initial material (i.e. resolution, color range, motion activity, audio dynamic range, bandwidth,...
Channel variations caused by motility would introduce inter-carrier interference (ICI), which degrades channel estimation and data detection in underwater orthogonal frequency division multiplexing (OFDM) systems. To deal with this problem, a joint time-varying channel estimation and inter-carrier interference mitigation method is proposed in this paper, where time domain channel estimation and interference...
Rate-Distortion Optimization in High Efficiency Video Coding promotes the coding efficiency, but also imposes intensive computation to the encoder, because the complex Syntax-based context-adaptive Binary Arithmetic Coding is performed for each candidate coding configuration. We develop the classification based regression method to derive the rate models, which fast estimate the bit cost of quantization...
Testing the inherited features is clearly essential, however, the testing process can easily become very complex if features in the child classes are unnecessarily tested. In this paper, an object-oriented testing technique "Inheritance Testing in Classes" (ITC) is proposed that facilitates the testing of object-oriented code by incorporating procedures to support inheritance testing. ITC...
HEVC doubles the coding efficiency with more than 4x coding complexity as compared to H.264/AVC. To alleviate the burden of Intra encoder, we estimate the RD-cost from the source image textures, and dynamically select two promising CU/PU mode candidates to execute exhaustive RDO processing. As integrated in our hardwired encoder, the averaged 61.7% computation complexity was saved with 4.53% rate...
Based on the pattern time delay shift coding regime, a structure of positive and negative frequency modulation calling pulses of underwater ultra-short base line acoustic positioning system is given, and the second correlation method of time delay estimation is proposed in this paper. As the second correlation method improves the detectable signal-to-noise ratio of calling end to certain extent, it...
A robust distortion measure known as the Sum of Linear-Log Squared Differences (SLLSD) derived analytically from the R-D optimality conditions for compression is proposed with particular applications in motion estimation (ME) and coding. When used in the context of ME, this new measure is shown both to improve motion robustness (accuracy) and lower the Lagrangian cost (coding) unlike the typically...
During the development and testing of navigation systems for modern cars, the video streams of the systems-under-test are carefully observed for errors of any kind. While this observation is typically carried out manually by software engineers monitoring the video output, the complexity and variety of the latest navigation systems demand an automated analysis of system functionality. Recently published...
An alternative, graphical model for motion estimation (ME) is proposed for video compression using a dense motion field. Unlike other types of optical flow-based motion analysis techniques, the chief goal of our work is jointly to discover a piece-wise smooth motion field with compression-motivated regularization, where the underlying motion compression scheme has resolution and quality scalability...
Rate control plays an important role in H.264/AVC video coding standard. For the frame layer rate control, since the estimated values of quantization parameter (QP) of the initial frame vary from the image complexity, this paper firstly proposes an improved method for the initial QP estimation to make it more accurate. For the macro block (MB) layer rate control, an improved MB layer rate control...
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