7.4L: <i>Late‐News Paper:</i> Reduction of Memory Capacity in Feedforward Driving by Image Compression

Someya, Jun; Yasugi, Masaki; Okuda, Noritaka; Kimura, Tomohiro; Yoshida, Masayuki; Gofuku, Eishi

doi:10.1889/1.1830886

Cited by 14 publications

(6 citation statements)

References 4 publications

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“…It is desired to reduce the cost of the system by compressing the data stored in the DRAM as in [6] and [7]. The errors in the decompressed image cause the errors in the amount of overdriving correction and have an effect on the reduction of motion blur.…”

Section: Fig 2 Block Diagram Of Overdrivementioning

confidence: 99%

A Hybrid Image Coding in Overdriving for Motion Blur Reduction in LCD

Wang¹,

Min²,

Chong³

2007

Entertainment Computing – ICEC 2007

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Abstract.Overdriving technique enlarges the desired change of the pixel value，the error in general compression methods is enlarged at the same time. Therefore ， we propose a novel Adaptive Quantization Coding (AQC) to reduce the error in compression for overdriving technique reducing motion blur. Considering hardware implementation, we develop a hybrid image coding which uses color transform first, and then uses AQC to compress luminance data as well as Block Truncation Coding (BTC) to compress chrominance data. The simulation results shown that the average PSNR was improved 5.676dB as compared with the result of BTC, and the average SD of error was reduced 50.2% than that in the BTC. The proposed algorithm is implemented with the verilog HDL and synthesized with the synopsys design compiler using 0.13μm Samsung Library.

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Section: Fig 2 Block Diagram Of Overdrivementioning

confidence: 99%

A Hybrid Image Coding in Overdriving for Motion Blur Reduction in LCD

Wang¹,

Min²,

Chong³

2007

Entertainment Computing – ICEC 2007

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“…However, since 2000, interest and research in the overdrive ͑OD͒ technology have tremendously increased. [10][11][12][13][14][15][16][17] Recent efforts have been focusing on how to reduce hardware cost to implement overdrive technology. [17][18][19][20][21][22] A conventional OD technology has bottlenecks to implement it in products.…”

Section: Introductionmentioning

confidence: 99%

New overdrive technology for liquid-crystal displays with a simple architecture

et al. 2010

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We propose a new technique to extract overdrive ͑OD͒ values that are indispensable to improve response characteristics of liquidcrystal displays. We show the relation among an OD value ͑D OD ͒, a previous frame data ͑D PF ͒, and a current frame data ͑D CF ͒ can be expressed very well by a third-order polynomial. To make the implementation of the OD technology to be simple, we propose to create a base line that is expressed by the third-order equation and to linearly shift it according to D PF . Our proposed method does not need the large size lookup tables ͑LUTs͒, whereas the conventional OD technology requests huge LUTs. Thus, our method can be easily implemented by very small circuits, which enables a low-cost solution. Only six measurements in our method are sufficient to obtain OD values of all the transition, whereas the conventional one wants 256 measurements. We investigate the best position of the base line and show how small the deviation from optimum values is. We prove that the proposed OD technology enables a low-cost implementation, high productivity, and high performance.

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“…Compression feed forward driving (cFFD), which is our second-generation overdrive technique, has already been developed [9][10][11]. This cFFD realized maintenance of performance and cost reduction through reducing the frame memory required by overdrive by means of the image compression technique.…”

Section: Introductionmentioning

confidence: 99%

“…Among others, we have been intensively considering a method of reducing the frame memory required by overdrive after the development of feed forward driving (FFD), which is our firstgeneration overdrive [1]. Compression feed forward driving (cFFD), which is our second-generation overdrive technique, has already been developed [9][10][11]. This cFFD realized maintenance of performance and cost reduction through reducing the frame memory required by overdrive by means of the image compression technique.…”

Section: Introductionmentioning

confidence: 99%

LP‐13: Late‐News Poster: A Study of Motion Adaptive CODEC Feedforward Driving without SDRAM

Someya

Okuda

2004

Symp Digest of Tech Papers

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Authors have been engaged in the development of a feed forward driving technique, as part of the overdrive technique to improve the response time of liquid crystal displays. They have developed, in particular, a compression feed forward driving system in which an image compression technique was applied, focusing on a method of reducing the frame memory necessary for the signal processing of overdrives. Further, they are now studying motion adaptive CODEC feed forward driving that reduces the amount of overdrive errors by adding a motion-adaptive process to the image decoding section in cFFD. This paper discusses macFFD that does not use SDRAM as the overdrive for entry model LCD TVs. Setting the image compression ratio to 1/10 or so will enable the fabrication of frame memory for overdrive for SDTV using SRAM. IntroductionImprovement of the performance of the display of motion pictures has been recently requested for liquid-crystal (LC) panels, in addition to the viewing angle, brightness, contrast and the gamut of color reproduction. This demand has been accelerated by users' comparisons of motion picture display performance between LC panels and conventional display devices, or CRTs, and is also driven by the fully-grown market of LC TVs.In recent years, a number of techniques have been reported for improving the performance of displaying motion pictures, such as the overdrive technique to improve the response time of LC display units, black insertion, blinking and back light to improve hold type problems, and so on [1-4].On the other hand, some new measurement methods to quantify blurs in motion pictures displayed on LC panels have been also discussed. It is said that motion blurs on LC panels are attributable to the long response time of LCs and the temporal summation by hold type displays. The study of a new definition of response time and a new method of evaluation has been promoted because the conventionally used definition of LC response time cannot properly express such performance factors of displaying motion pictures [5][6][7][8].Among others, we have been intensively considering a method of reducing the frame memory required by overdrive after the development of feed forward driving (FFD), which is our firstgeneration overdrive [1]. Compression feed forward driving (cFFD), which is our second-generation overdrive technique, has already been developed [9][10][11]. This cFFD realized maintenance of performance and cost reduction through reducing the frame memory required by overdrive by means of the image compression technique.Further, we have started the study of motion adaptive codec FFD (macFFD), in which a motion-adaptive processing unit is added to the image decoding section of cFFD, as the third-generation FFD. The use of the motion-adaptive processing function in the image decoding section enables us to restrain the occurrence of unnecessary acceleration data in still pictures, which is one of features of cFFD, and at the same time, to reduce acceleration data errors in motion pictures [12].In th...

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7.4L: Late‐News Paper: Reduction of Memory Capacity in Feedforward Driving by Image Compression

Abstract: The algorithm to reduce the memory capacity in FFD (Feedforward Driving) is discussed. FFD improves the motion video on LCD. The application of image compression technology achieves approximately one tenthorder reduction of memory capacity.

Cited by 14 publications

References 4 publications

A Hybrid Image Coding in Overdriving for Motion Blur Reduction in LCD

A Hybrid Image Coding in Overdriving for Motion Blur Reduction in LCD

New overdrive technology for liquid-crystal displays with a simple architecture

LP‐13: Late‐News Poster: A Study of Motion Adaptive CODEC Feedforward Driving without SDRAM

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