Improved universal chroma 4:2:2 subsampling for color filter array video coding in HEVC

Chung, Kuo–Liang; Huang, Yong-Huai; Lin, Chien-Hsiung

doi:10.1007/s11760-017-1055-1

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…This approach reduced the formation of interpolation artifacts and colored spots, but still this method failed to control the computational cost. Chung et al 27 modeled chroma 4:2:2 subsampling system to compress CFA video. Here, the luma modification method was applied to enhance the efficiency of the reconstructed CFA video.…”

Section: Motivationmentioning

confidence: 99%

“…The difficulties of the existing video demosaicing techniques are detailed below: The demosaicing model, named optimizing code is developed in Reference 24. This approach failed to overcome the optimization problem such that the performance decreased. The subsampling model was introduced in Reference 27 for compressing CFA images. Generally, the subsampling approach does not have adequate quality assistance, particularly in a low QP state.…”

Section: Motivationmentioning

confidence: 99%

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Enhancement of video demosaicing techniques using optimization algorithm

Alphonse

Sylam

2023

Concurrency and Computation

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Demosaicing and denoising are the most significant steps in the imaging process for both images and videos. The correlation noise corrupts the image quality, such that an accurate interpretation of the image is avoided. Thus, demosaicing is utilized to restructure the full-color image from imperfect color samples. In this article, cat shuffled shepherd optimization-based local polynomial approximation and intersection of confidence intervals (Cat SSO-based LPA-ICI) approach is developed for video demosaicing. The LPA-ICI model is employed for frame demosaicing in which the second-order polynomial interpolation filter coefficients are produced using the devised optimization algorithm, named cat SSO technique. Similarly, generative adversarial network classifier is also applied for frame demosaicing. In addition, initialization and flow estimation is performed for the demosaicing process. Besides, spatio temporal demosaicing model is utilized in order to get a noise-free sequence. However, the developed cat SSO technique is newly devised by the incorporation of the shuffled shepherd optimization algorithm and cat swarm optimization technique. The created video demosaicing model outperformed with peak signal-to-noise ratio, root mean square error, and second derivative-like measure of enhancement values of 56.85 dB, 0.46, and 60.62, respectively.

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Section: Motivationmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Enhancement of video demosaicing techniques using optimization algorithm

Alphonse

Sylam

2023

Concurrency and Computation

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“…For example, based on the locations of R and B in the CFA image, the subsampled U and V were computed for YUV420 or YUV422 in [11]. The results for YUV422 were improved in [12] by examining all the possibilities for the Bayer format for H.264, and investigated in [13] for HEVC, the high efficient video coding. For YUV420, the work in [5] designed a chroma subsampling method producing U and V based on the pixel locations of R and B.…”

Section: Introductionmentioning

confidence: 99%

Low-Complexity Chroma Subsampling Using Optimal Lines of Subproblems of Pixel Distortion

Lin

Jiang

2022

IEEE Trans. Circuits Syst. Video Technol.

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Video compression is an important procedure for digital applications. A commonly used format for inputs to video coders is YUV420, which is a subsampled result from YUV444, that is transformed and demosaicked from a color filter array (CFA) format. The process of chroma subsampling is a crucial step for the reconstructed image quality. A state-ofthe-art method utilizes the solution of a prior method to compute the starting point, and devises a search method to improve the results. However, the search method does not consider the optimality condition of the problem, and the overall computational complexity is high because of the execution of the prior method for the starting point. In the proposed work, the cost function of the optimization problem is analyzed and decomposed into 4 subchannels based on the CFA format. The optimal line of each subterm is studied in 3dimensional space. The problem is then mathematically reduced to a 3-subchannel problem. Based on the combinations of the optimal lines, a triangle search area is formed and proved to contain the optimal solution. And because the derived triangle search area is small on average, the search for the optimal value can be considerably fast. Experimental results demonstrate that the proposed approach can produce reconstructed images with qualities that are exactly the same as those generated using the state-of-the-art method. Relative to the state-of-the-art method, the proposed approach can reduce the time complexity by 84.08%-84.91%, and reduce the number of search points by 40.24%-85.25%, for the image datasets Kodak and IMAX with different demosaicking methods.

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Critical Review of External Recorders in Film and Television Production

Singh

Pattanayak

2023

2023 International Conference on Computational Intelligence and Knowledge Economy (ICCIKE)

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Improved universal chroma 4:2:2 subsampling for color filter array video coding in HEVC

Cited by 6 publications

References 9 publications

Enhancement of video demosaicing techniques using optimization algorithm

Enhancement of video demosaicing techniques using optimization algorithm

Low-Complexity Chroma Subsampling Using Optimal Lines of Subproblems of Pixel Distortion

Critical Review of External Recorders in Film and Television Production

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