Rate–distortion optimization of multi-exposure image coding for high dynamic range image coding

Chiang, Jui-Chiu; Shih, Wen-Hsien; Deng, Jhih-You

doi:10.1016/j.image.2021.116238

Cited by 2 publications

(13 citation statements)

References 45 publications

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“…The LDR images are referred to as "View 0" (𝑉 0 ), "View 1" (𝑉 1 ), and "View 2" (𝑉 2 ) on the basis of the coding order in the proposed architecture. In [54], a change in coding order between the under-exposed and over-exposed images did not affect coding performance because nonbase view uses only the base view as reference.…”

Section: B Proposed Multi-exposure Image Coding Schemementioning

confidence: 99%

“…In this study, we attempted to achieve high-efficiency multi-exposure LDR image encoding to generate a high-quality HDR image in the decoder. In our previous study [54], multi-exposure LDR images were coded using a multi-view coding scheme in which each LDR image is treated as a view and the redundancy between views is used after intensity conversion between the views. The main task in [54] was to redefine the distortion in the RDO process.…”

Section: ) Two-layer Hdr Image Codingmentioning

confidence: 99%

“…In our previous study [54], multi-exposure LDR images were coded using a multi-view coding scheme in which each LDR image is treated as a view and the redundancy between views is used after intensity conversion between the views. The main task in [54] was to redefine the distortion in the RDO process. In the RDO process adopted in [54], both the distortion in the current block and MEF block was used to define the distortion.…”

Section: ) Two-layer Hdr Image Codingmentioning

confidence: 99%

“…The main task in [54] was to redefine the distortion in the RDO process. In the RDO process adopted in [54], both the distortion in the current block and MEF block was used to define the distortion. However, an MEF image is a contrast-enhanced LDR image, and the distortion in an MEF image does not completely reflect the quality of a reconstructed HDR image.…”

Section: ) Two-layer Hdr Image Codingmentioning

confidence: 99%

“…The efficiency of multi-exposure image coding depends on how well the correlation among the images is explored. As in our previous study [54], this study used an MV-HEVC [55] scheme, and each LDR image was treated as a view. The use of this conventional 8-bit codec for HDR image coding is practical because it does not require conversion from the floatingpoint format to the integer format where the PQ operation is employed in general HDR image coding.…”

Section: Proposed Frameworkmentioning

confidence: 99%

See 4 more Smart Citations

Multi-Exposure Image Compression Considering Rate-Distortion Optimization in Rendered High Dynamic Range Image

Chiang

Shang²,

Qiu

2023

IEEE Open J. Signal Process.

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High-dynamic range (HDR) images, which provide realistic visual perception, have attracted considerable attention in various applications. A simple method for obtaining HDR images is to fuse multiple low-dynamic range (LDR) images captured under varying exposures. We proposed a method of efficiently encoding multi-exposure images using multi-view High Efficiency Video Coding (MV-HEVC) along with intensity mapping function (IMF) to create high-quality HDR images. The inter-view prediction in MV-HEVC eliminates redundancy between multi-exposure images. To achieve high-efficiency MV-HEVC-based multi-exposure image coding, two modifications to the rate-distortion optimization (RDO) process performed during encoding were proposed. First, the distortion in the rendered HDR image is used to replace the original distortion, which depends on the LDR image. Second, to balance distortion and rate in RDO, a new Lagrange multiplier is derived from the derivative of the new distortion with respect to the rate. A model of the distortion in the HDR domain was constructed and expressed as a function of the distortion in the LDR domain. The proposed scheme utilizes the conventional 8-bit codec to compress multi-exposure LDR images and generate an HDR image in the decoder. The experimental results indicate that the proposed technique outperforms HDR image coding schemes in which HEVC Range Extension and JPEG-XT coding standards are used.

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Section: B Proposed Multi-exposure Image Coding Schemementioning

confidence: 99%

Section: ) Two-layer Hdr Image Codingmentioning

confidence: 99%

Section: ) Two-layer Hdr Image Codingmentioning

confidence: 99%

Section: ) Two-layer Hdr Image Codingmentioning

confidence: 99%

Section: Proposed Frameworkmentioning

confidence: 99%

See 3 more Smart Citations

Multi-Exposure Image Compression Considering Rate-Distortion Optimization in Rendered High Dynamic Range Image

Chiang

Shang²,

Qiu

2023

IEEE Open J. Signal Process.

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Application of Visual Communication Technology in Image Enhancement and Optimization of Human Machine Interaction Interface

2024

Proceedings of the 3rd International Conference on Internet Technology and Educational Informatization, ITEI 2023, November 24–

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To address the technical issues in the design process of traditional humancomputer interaction systems, a human-computer interaction system design based on visual communication technology is implemented. Firstly, for the skin color detection method in color space, a neural network color filter based on fuzzy patterns is created based on the BP neural network model based on the threshold changes of different lighting conditions. The filter designed in this paper has a fast learning speed and can be used in vast lighting conditions and complex environments. Moreover, the humancomputer interaction system has been meticulously crafted to align seamlessly with users' accustomed practices. Leveraging the EC5-1719CLDNA embedded star as its hardware foundation, the system integrates a compact projection unit and a radiation control system. On the software front, a paperless office interaction engine has been developed, making optimal use of the robust computational capabilities offered by multithreading and the selected hardware platform. Subsequently, rigorous testing was conducted, affirming that the system not only meets but surpasses the specified operational demands.

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Rate–distortion optimization of multi-exposure image coding for high dynamic range image coding

Cited by 2 publications

References 45 publications

Multi-Exposure Image Compression Considering Rate-Distortion Optimization in Rendered High Dynamic Range Image

Multi-Exposure Image Compression Considering Rate-Distortion Optimization in Rendered High Dynamic Range Image

Application of Visual Communication Technology in Image Enhancement and Optimization of Human Machine Interaction Interface

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