Amrita Ganguly - Academia.edu (original) (raw)
Papers by Amrita Ganguly
Lecture Notes in Electrical Engineering, 2020
H.264/AVC video coding standard outperforms former standards in terms of coding efficiency but at... more H.264/AVC video coding standard outperforms former standards in terms of coding efficiency but at the expense of higher computation complexity. Of all the encoding elements in H.264, inter prediction is computationally most intensive and thus adds to the computational burden for the encoder. In this paper, we propose a fast inter prediction algorithm for JVT video coding standard H.264/ AVC. Prior to performing the motion estimation for inter prediction, characteristics like stationarity and homogeneity of each macroblock is determined. The macroblocks correlation with neighboring macroblocks in respect of predicted motion vectors and encoding modes are studied. Weights are assigned for these parameters and the final mode is selected based upon these weights. The average video encoding time reduction in the proposed method is 70% compared to the JVT benchmark JM12.4 while maintaining similar PSNR and bit rate. Experimental results for various test sequences at different resolutions ...
A flow microcalorimeter system has been assembled and is being used in a thermodynamic study of s... more A flow microcalorimeter system has been assembled and is being used in a thermodynamic study of surfactant systems as part of the Energy Research and Development Administration's enhanced oil recovery program. Enthalpies of dilution and demicellization of sodium dodecyl sulfate have been measured over a temperature range of 20' to 35° C. This surfactant has a Iso been studied with cosurfactant and salt backgrounds. The critical micelle concentrations (cmc) have been determined and are in excel lent agreement with those in the literature. Studies below the cmc suggest the possible formation ; of a dimer. Work on alkyl sulfonates and alkylbenzene sulfonates is planned.
Biomedical Signal Processing and Control, 2021
2019 International Conference on Wireless Communications Signal Processing and Networking (WiSPNET), 2019
Sickle cell anemia (SCA) is a type of haemolytic anemia which is the most commonly inherited bloo... more Sickle cell anemia (SCA) is a type of haemolytic anemia which is the most commonly inherited blood disorder. Detection of red blood cell and sickle cell from sickle cell anemic person is a very challenging task. Besides traditional visual inspection of microscopic images, various methods have been developed which are based on image processing technique for faster and more accurate diagnosis of SCA. In this paper normal and abnormal red blood cells have been detected using Niblack’s thresholding technique from microscopic blood images of sickle cell anemic patient. The process involves preprocessing of microscopic blood smear and segmenting the preprocessed image using Niblack’s thresholding algorithm. Then using geometrical features of blood cells a metric (form factor) is calculated to classify normal red blood cells and abnormal cells.
2015 International Conference on Energy, Power and Environment: Towards Sustainable Growth (ICEPE), 2015
This paper presents wavelet transform based analysis to determine whether a fault has occurred at... more This paper presents wavelet transform based analysis to determine whether a fault has occurred at near end or far end with respect to a reference bus and thus facilitates the calculation of fault location based on the lattice diagram of the travelling wave phenomenon in transmission line. Faults in power transmission lines cause transients that travel at the speed of light and propagate along the line as travelling wave. The fault is generated in a simple two bus system within the MATLAB Simulink program. Clarke's transform has been applied to convert the fault current into their modal components. Aerial mode is only applied in the analysis. Daubechies4 wavelet transform has been applied to decompose the Aerial mode into Scale 1 and Scale 2 wavelet coefficient.
2015 International Conference on Energy, Power and Environment: Towards Sustainable Growth (ICEPE), 2015
Highlights • Detection and classification of faults are extremely essential in power system. • A ... more Highlights • Detection and classification of faults are extremely essential in power system. • A novel fault detection technique is proposed for transmission line. • Fault classification methodology is proposed using wavelet transform. • The accuracy in fault classification was improved with proposed methodology.
Communications in Computer and Information Science, 2012
H.264/AVC video coding standard outperforms former standards in terms of coding efficiency but at... more H.264/AVC video coding standard outperforms former standards in terms of coding efficiency but at the expense of higher computation complexity. Of all the encoding elements in H.264/AVC, inter prediction is computationally most intensive and thus adds to the computational burden for the encoder. In this paper, we propose a fast inter prediction algorithm for JVT video coding standard H.264/AVC. All images have certain characteristics that are inherent to them. Natural videos have many homogeneous regions. In video sequences, there are stationary regions between frames and regions with moderate to complex motion. From an in-depth analysis of the full search algorithm in which properties of each macroblock (MB) are studied in details, a method is proposed where each MB is given a weight depending upon its characteristics. The motion content and the homogeneity parameters of each MB is determined prior to the ME process. The MBs correlation with neighboring MBs in respect of predicted motion vectors (MV) and encoding modes are studied. Weights are assigned for these parameters and the final mode is selected based upon these weights. We propose a Weight Based Fast Mode Decision (WBFMD) process where we define four weights for each MB based on its motion content, homogeneity, value of the predicted MV and the encoding modes of the neighboring MBs. Smaller weights are assigned when these parameters have low values indicating a simple MB whereas larger weights are assigned when these parameters have high value indicating a more complex MB. The average video encoding time reduction in the proposed method is 70% compared to the JVT benchmark JM12.4 while maintaining similar PSNR and bit rate. Experimental results for various test sequences at different resolutions are presented to show the effectiveness of the proposed method.
Software Technology and Engineering - Proceedings of the International Conference on ICSTE 2009, 2009
Signal, Image and Video Processing, 2012
Video compression standard H.264/AVC outperforms previous standards in terms of coding efficiency... more Video compression standard H.264/AVC outperforms previous standards in terms of coding efficiency but at the cost of higher computational complexity. In H.264/AVC, the variable block size full motion estimation is the most time-consuming operation. This paper presents a method to reduce the complexity of motion estimation in two stages. The first stage exploits the similarities between frames for early SKIP mode decision for a macroblock (MB) based upon a criteria formulated on the basis of the statistics of the frame difference residues. MBs that fail to qualify for the SKIP mode in the first stage spills over to the second stage where mode decision depends upon the number of zero blocks (ZB) in the MB. The study of the full search motion estimation on different sequences show that there is a strong dependence between the number of ZBs in a MB and the likelihood of a particular mode being selected. The proposed algorithm utilizes this relationship for early mode decision for a MB. The algorithm is evaluated using a wide range of test sequences from different classes. Experimental results show that the proposed algorithm gives considerable saving in encoding time and search points in the range of 36-87%. Furthermore, despite the reduction in computational complexity, the coding efficiency (picture quality and bitrate) in the proposed method is comparable to the H.264/AVC standard software Joint Model (JM12.4).
Proceedings of the Seventh Indian Conference on Computer Vision, Graphics and Image Processing - ICVGIP '10, 2010
Video compression algorithms require decision making regarding the selection of different coding ... more Video compression algorithms require decision making regarding the selection of different coding modes. Of all the encoding elements in H.264, inter prediction is computationally most intensive and thus adds to the computational burden for the encoder. In this paper, we propose a fast inter prediction algorithm for JVT video coding standard H.264/AVC. The fast prediction algorithm is based on the edge information obtained by calculating the edge histogram parameters of the frame difference residual image. The inclusion of different modes for motion estimation is based on the direction information obtained from the edge histogram parameters. The proposed method reduces the computational complexity and time considerably by upto 63% compared to the JVT benchmark JM12.4 while maintaining similar PSNR and bit rate. Experimental results for various test sequences at different resolutions are presented to show the effectiveness of the proposed method.
TENCON 2009 - 2009 IEEE Region 10 Conference, 2009
In this paper, we propose a fast mode decision algorithm for intra and inter prediction for H.264... more In this paper, we propose a fast mode decision algorithm for intra and inter prediction for H.264/AVC video coding. Here the subband decomposition of the input video is done for the fast mode prediction. To the LL band of the subband decomposition of the video, exhaustive intra prediction is done. To the LH, HL and HH bands selective intra prediction modes are used for the intra prediction. For the inter mode decision, the motion estimation is performed for the LL band and the motion vectors obtained are used directly for the high frequency bands. The proposed method reduces the computational complexity and time considerably while maintaining similar PSNR and bit rate. Experimental results for various test sequences at different resolutions are presented to show the effectiveness of the proposed method.
TENCON 2009 - 2009 IEEE Region 10 Conference, 2009
In this paper, we propose a fast intra-prediction mode selection method for JVT video coding stan... more In this paper, we propose a fast intra-prediction mode selection method for JVT video coding standard H.264. The fast mode decision is based on the quantization parameter and the local edge information obtained by calculating the edge histogram parameters. The inclusion of the DC mode is based on the Residual Complexity factor. The proposed method reduces the computational complexity and
International Journal of Computer Applications, 2012
Lecture Notes in Electrical Engineering, 2020
H.264/AVC video coding standard outperforms former standards in terms of coding efficiency but at... more H.264/AVC video coding standard outperforms former standards in terms of coding efficiency but at the expense of higher computation complexity. Of all the encoding elements in H.264, inter prediction is computationally most intensive and thus adds to the computational burden for the encoder. In this paper, we propose a fast inter prediction algorithm for JVT video coding standard H.264/ AVC. Prior to performing the motion estimation for inter prediction, characteristics like stationarity and homogeneity of each macroblock is determined. The macroblocks correlation with neighboring macroblocks in respect of predicted motion vectors and encoding modes are studied. Weights are assigned for these parameters and the final mode is selected based upon these weights. The average video encoding time reduction in the proposed method is 70% compared to the JVT benchmark JM12.4 while maintaining similar PSNR and bit rate. Experimental results for various test sequences at different resolutions ...
A flow microcalorimeter system has been assembled and is being used in a thermodynamic study of s... more A flow microcalorimeter system has been assembled and is being used in a thermodynamic study of surfactant systems as part of the Energy Research and Development Administration's enhanced oil recovery program. Enthalpies of dilution and demicellization of sodium dodecyl sulfate have been measured over a temperature range of 20' to 35° C. This surfactant has a Iso been studied with cosurfactant and salt backgrounds. The critical micelle concentrations (cmc) have been determined and are in excel lent agreement with those in the literature. Studies below the cmc suggest the possible formation ; of a dimer. Work on alkyl sulfonates and alkylbenzene sulfonates is planned.
Biomedical Signal Processing and Control, 2021
2019 International Conference on Wireless Communications Signal Processing and Networking (WiSPNET), 2019
Sickle cell anemia (SCA) is a type of haemolytic anemia which is the most commonly inherited bloo... more Sickle cell anemia (SCA) is a type of haemolytic anemia which is the most commonly inherited blood disorder. Detection of red blood cell and sickle cell from sickle cell anemic person is a very challenging task. Besides traditional visual inspection of microscopic images, various methods have been developed which are based on image processing technique for faster and more accurate diagnosis of SCA. In this paper normal and abnormal red blood cells have been detected using Niblack’s thresholding technique from microscopic blood images of sickle cell anemic patient. The process involves preprocessing of microscopic blood smear and segmenting the preprocessed image using Niblack’s thresholding algorithm. Then using geometrical features of blood cells a metric (form factor) is calculated to classify normal red blood cells and abnormal cells.
2015 International Conference on Energy, Power and Environment: Towards Sustainable Growth (ICEPE), 2015
This paper presents wavelet transform based analysis to determine whether a fault has occurred at... more This paper presents wavelet transform based analysis to determine whether a fault has occurred at near end or far end with respect to a reference bus and thus facilitates the calculation of fault location based on the lattice diagram of the travelling wave phenomenon in transmission line. Faults in power transmission lines cause transients that travel at the speed of light and propagate along the line as travelling wave. The fault is generated in a simple two bus system within the MATLAB Simulink program. Clarke's transform has been applied to convert the fault current into their modal components. Aerial mode is only applied in the analysis. Daubechies4 wavelet transform has been applied to decompose the Aerial mode into Scale 1 and Scale 2 wavelet coefficient.
2015 International Conference on Energy, Power and Environment: Towards Sustainable Growth (ICEPE), 2015
Highlights • Detection and classification of faults are extremely essential in power system. • A ... more Highlights • Detection and classification of faults are extremely essential in power system. • A novel fault detection technique is proposed for transmission line. • Fault classification methodology is proposed using wavelet transform. • The accuracy in fault classification was improved with proposed methodology.
Communications in Computer and Information Science, 2012
H.264/AVC video coding standard outperforms former standards in terms of coding efficiency but at... more H.264/AVC video coding standard outperforms former standards in terms of coding efficiency but at the expense of higher computation complexity. Of all the encoding elements in H.264/AVC, inter prediction is computationally most intensive and thus adds to the computational burden for the encoder. In this paper, we propose a fast inter prediction algorithm for JVT video coding standard H.264/AVC. All images have certain characteristics that are inherent to them. Natural videos have many homogeneous regions. In video sequences, there are stationary regions between frames and regions with moderate to complex motion. From an in-depth analysis of the full search algorithm in which properties of each macroblock (MB) are studied in details, a method is proposed where each MB is given a weight depending upon its characteristics. The motion content and the homogeneity parameters of each MB is determined prior to the ME process. The MBs correlation with neighboring MBs in respect of predicted motion vectors (MV) and encoding modes are studied. Weights are assigned for these parameters and the final mode is selected based upon these weights. We propose a Weight Based Fast Mode Decision (WBFMD) process where we define four weights for each MB based on its motion content, homogeneity, value of the predicted MV and the encoding modes of the neighboring MBs. Smaller weights are assigned when these parameters have low values indicating a simple MB whereas larger weights are assigned when these parameters have high value indicating a more complex MB. The average video encoding time reduction in the proposed method is 70% compared to the JVT benchmark JM12.4 while maintaining similar PSNR and bit rate. Experimental results for various test sequences at different resolutions are presented to show the effectiveness of the proposed method.
Software Technology and Engineering - Proceedings of the International Conference on ICSTE 2009, 2009
Signal, Image and Video Processing, 2012
Video compression standard H.264/AVC outperforms previous standards in terms of coding efficiency... more Video compression standard H.264/AVC outperforms previous standards in terms of coding efficiency but at the cost of higher computational complexity. In H.264/AVC, the variable block size full motion estimation is the most time-consuming operation. This paper presents a method to reduce the complexity of motion estimation in two stages. The first stage exploits the similarities between frames for early SKIP mode decision for a macroblock (MB) based upon a criteria formulated on the basis of the statistics of the frame difference residues. MBs that fail to qualify for the SKIP mode in the first stage spills over to the second stage where mode decision depends upon the number of zero blocks (ZB) in the MB. The study of the full search motion estimation on different sequences show that there is a strong dependence between the number of ZBs in a MB and the likelihood of a particular mode being selected. The proposed algorithm utilizes this relationship for early mode decision for a MB. The algorithm is evaluated using a wide range of test sequences from different classes. Experimental results show that the proposed algorithm gives considerable saving in encoding time and search points in the range of 36-87%. Furthermore, despite the reduction in computational complexity, the coding efficiency (picture quality and bitrate) in the proposed method is comparable to the H.264/AVC standard software Joint Model (JM12.4).
Proceedings of the Seventh Indian Conference on Computer Vision, Graphics and Image Processing - ICVGIP '10, 2010
Video compression algorithms require decision making regarding the selection of different coding ... more Video compression algorithms require decision making regarding the selection of different coding modes. Of all the encoding elements in H.264, inter prediction is computationally most intensive and thus adds to the computational burden for the encoder. In this paper, we propose a fast inter prediction algorithm for JVT video coding standard H.264/AVC. The fast prediction algorithm is based on the edge information obtained by calculating the edge histogram parameters of the frame difference residual image. The inclusion of different modes for motion estimation is based on the direction information obtained from the edge histogram parameters. The proposed method reduces the computational complexity and time considerably by upto 63% compared to the JVT benchmark JM12.4 while maintaining similar PSNR and bit rate. Experimental results for various test sequences at different resolutions are presented to show the effectiveness of the proposed method.
TENCON 2009 - 2009 IEEE Region 10 Conference, 2009
In this paper, we propose a fast mode decision algorithm for intra and inter prediction for H.264... more In this paper, we propose a fast mode decision algorithm for intra and inter prediction for H.264/AVC video coding. Here the subband decomposition of the input video is done for the fast mode prediction. To the LL band of the subband decomposition of the video, exhaustive intra prediction is done. To the LH, HL and HH bands selective intra prediction modes are used for the intra prediction. For the inter mode decision, the motion estimation is performed for the LL band and the motion vectors obtained are used directly for the high frequency bands. The proposed method reduces the computational complexity and time considerably while maintaining similar PSNR and bit rate. Experimental results for various test sequences at different resolutions are presented to show the effectiveness of the proposed method.
TENCON 2009 - 2009 IEEE Region 10 Conference, 2009
In this paper, we propose a fast intra-prediction mode selection method for JVT video coding stan... more In this paper, we propose a fast intra-prediction mode selection method for JVT video coding standard H.264. The fast mode decision is based on the quantization parameter and the local edge information obtained by calculating the edge histogram parameters. The inclusion of the DC mode is based on the Residual Complexity factor. The proposed method reduces the computational complexity and
International Journal of Computer Applications, 2012