Locally Adaptive Resolution (LAR) codec

Pasteau, François; Babel, Marie; Déforges, Olivier; Strauss, Clément; Bédat, Laurent

doi:10.5772/7454

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…Yet, small blocks correspond to strong depth discontinuities and errors occurring in these areas may have disastrous effect at the synthesis step. Figure 4 shows the impact of the quantization as suggested in Pasteau et al 16 (first column) at 0.06 bpp. Depth transitions are highly degraded and will result in errors in the synthesized frame (third column, crumbling artifacts around the head and around the legs of the chair).…”

Section: Rate Control In Depth Mapmentioning

confidence: 98%

“…Pasteau et al 16 suggested applying a quantization step depending on the block sizes, in the case of conventional images. Our experiments revealed that in the case of depth map compression, this was not an adequate strategy because the smaller the blocks, the coarser was the quantization (this allowed bit rate savings because small block are costly).…”

Section: Rate Control In Depth Mapmentioning

confidence: 99%

“…Thus the method is meant to preserve edges and to ensure consistent localization of color edges and depth edges. It is based on a 2D still image codec, namely LAR 16 (Locally adapted Resolution). The LAR codec is based on a quad-tree representation of the images.…”

Section: Introductionmentioning

confidence: 99%

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A content-based method for perceptually driven joint color/depth compression

2012

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Multi-view Video plus Depth (MVD) data refer to a set of conventional color video sequences and an associated set of depth video sequences, all acquired at slightly different viewpoints. This huge amount of data necessitates a reliable compression method. However, there is no standardized compression method for MVD sequences. H.264/MVC compression method, which was standardized for Multi many adaptations to MVD. However, it has been shown that MVC is We propose a novel option as for compression of MVD data. consistency. The originality of the proposed method relies on the use of the decoded color data a associated depth compression. This is meant to motivated by previous studies of artifacts occurring in synthesized views: most annoying distortions are located strong depth discontinuities and these distortions are due to misalignment of depth and color edges in decoded images. Thus the method is meant to preserve edges and to ensure consistent localization of color edges and depth edges. To ensure compatibility, colored sequences are encoded with H.264. Depth maps compression image codec, namely LAR (Locally adapted Resolution). It consists in a quad quad-tree representation contributes in the p The adopted strategy is meant to be more perceptually driven than state compared to H.264 encoding of depth images. O method, and visual quality of synthesized views is improved with the proposed approach.

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Section: Rate Control In Depth Mapmentioning

confidence: 98%

Section: Rate Control In Depth Mapmentioning

confidence: 99%

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A content-based method for perceptually driven joint color/depth compression

2012

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“…The method targets blue and red tones to control the coldness or warmth of an image. In our previous method, we adopted the YDbDr color space [19] used in JPEG 2000 [20] instead of the HSV color space. A reference area is first defined in the D b -D r plane.…”

Section: Introductionmentioning

confidence: 99%

An Extended Method for Reversible Color Tone Control Using Data Hiding

Nakaya,

Imaizumi

2024

Electronics

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This paper proposes an extended method for reversible color tone control for blue and red tones. Our previous method has an issue in that there are cases where the intensity of enhancement cannot be flexibly controlled. In contrast, the proposed method can gradually improve the intensity by increasing the correction coefficients, regardless of the image features. This is because the method defines one reference area where the correction coefficients are determined, one each for blue and red tones, while the previous method defines a common reference area for both tones. Owing to this, the method also provides independent control for blue and red tones. In our experiments, we clarify the above advantages of the method. Additionally, we also discuss the influence of the data-embedding process, which is necessary to store recovery information, on the output image quality.

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Adaptive color space model based on dominant colors for image and video compression performance improvement

Madenda

Darmayantie

2021

Computer Optics

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This paper describes the use of some color spaces in JPEG image compression algorithm and their impact in terms of image quality and compression ratio, and then proposes adaptive color space models (ACSM) to improve the performance of lossy image compression algorithm. The proposed ACSM consists of, dominant color analysis algorithm and YCoCg color space family. The YCoCg color space family is composed of three color spaces, which are YCcCr, YCpCg and YCyCb. The dominant colors analysis algorithm is developed which enables to automatically select one of the three color space models based on the suitability of the dominant colors contained in an image. The experimental results using sixty test images, which have varying colors, shapes and textures, show that the proposed adaptive color space model provides improved performance of 3 % to 10 % better than YCbCr, YDbDr, YCoCg and YCgCo-R color spaces family. In addition, the YCoCg color space family is a discrete transformation so its digital electronic implementation requires only two adders and two subtractors, both for forward and inverse conversions.

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Locally Adaptive Resolution (LAR) codec

Cited by 3 publications

References 5 publications

A content-based method for perceptually driven joint color/depth compression

A content-based method for perceptually driven joint color/depth compression

An Extended Method for Reversible Color Tone Control Using Data Hiding

Adaptive color space model based on dominant colors for image and video compression performance improvement

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