Uncertainty of digital image correlation under video compression and DSP optimization

Xiaowen Li; Xinqiao Tang; Yinuo Xu; Wei Sun; Zhenning Chen

doi:10.1364/AO.511691

Applied Optics
Vol. 63,
Issue 9,
pp. 2340-2351
(2024)
•https://doi.org/10.1364/AO.511691

Uncertainty of digital image correlation under video compression and DSP optimization

Xiaowen Li, Xinqiao Tang, Yinuo Xu, Wei Sun, and Zhenning Chen

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Xiaowen Li, Xinqiao Tang, Yinuo Xu, Wei Sun, and Zhenning Chen, "Uncertainty of digital image correlation under video compression and DSP optimization," Appl. Opt. 63, 2340-2351 (2024)

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Abstract

The storage and transmission of videos at high spatial resolution remain a great challenge in image-based optical techniques. The uncertainty of digital image correlation (DIC) was assessed following speckle video compression under High Efficiency Video Coding (HEVC/H.265). First, the evaluation criterion for the DIC accuracy affected by compression was provided. The stability of H.265 video compression in DIC was studied considering different compressed frames under different target quantization parameters (QPs) and compression ratios (CRs). The deformation uncertainty of the DIC itself as affected by H.265 video compression was further investigated through uniform translation and non-uniform sinusoidal deformation performance. Moreover, the optimized digital speckle pattern (DSP) was re-evaluated considering video compression-induced uncertainty. DSPs with parameters of different diameters and randomness were compressed using various QPs and CRs. In addition, DSP evaluation was performed under both translation and non-homogeneous deformation conditions. The feasibility of the re-optimized DSP under H.265 video compression was validated using a defective bending beam, and DSP videos with a speckle size of 8 pixels reached a high CR within an acceptable margin of error.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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	1001 Speckle Patterns					10,001 Speckle Patterns
QP	$C_{r}$	${\bar{E}}_{u} / p i x e l$	$η^{'} / p i x e l$	$\bar{E_{e}} / μ ε$	$ξ^{'} / μ ε$	$C_{r}$	${\bar{E}}_{u} / p i x e l$	$η^{'} / p i x e l$	$\bar{E_{e}} / μ ε$	$ξ^{'} / μ ε$
22	2.77	0.01926	0.00196	5.58	3.91	2.78	0.01940	0.00431	11.30	15.21
35	39.03	0.02315	0.01733	269.49	64.95	39.86	0.02322	0.01771	263.83	63.18
51	1214.53	0.06990	0.04091	1039.35	268.54	1470.69	0.07097	0.04603	1036.55	276.83

	CR		${\bar{E}}_{u} / p i x e l$		${\bar{E}}_{e} / µ ε$		Time/s
QP	HM	FFmpeg	HM	FFmpeg	HM	FFmpeg	HM	FFmpeg
22	6.93	1.49	0.0004	0.0004	0.4383	0.3714	6303.93	5.00
35	156.25	23.41	0.0141	0.0050	2.3041	3.2368	1231.46	1.13
51	2072.37	597.55	0.0317	0.0458	17.1824	13.8858	798.79	0.35

	1001 Speckle Patterns					10,001 Speckle Patterns
QP	$C_{r}$	${\bar{E}}_{u} / p i x e l$	$η^{'} / p i x e l$	$\bar{E_{e}} / μ ε$	$ξ^{'} / μ ε$	$C_{r}$	${\bar{E}}_{u} / p i x e l$	$η^{'} / p i x e l$	$\bar{E_{e}} / μ ε$	$ξ^{'} / μ ε$
22	2.77	0.01926	0.00196	5.58	3.91	2.78	0.01940	0.00431	11.30	15.21
35	39.03	0.02315	0.01733	269.49	64.95	39.86	0.02322	0.01771	263.83	63.18
51	1214.53	0.06990	0.04091	1039.35	268.54	1470.69	0.07097	0.04603	1036.55	276.83

	CR		${\bar{E}}_{u} / p i x e l$		${\bar{E}}_{e} / µ ε$		Time/s
QP	HM	FFmpeg	HM	FFmpeg	HM	FFmpeg	HM	FFmpeg
22	6.93	1.49	0.0004	0.0004	0.4383	0.3714	6303.93	5.00
35	156.25	23.41	0.0141	0.0050	2.3041	3.2368	1231.46	1.13
51	2072.37	597.55	0.0317	0.0458	17.1824	13.8858	798.79	0.35

Abstract

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Applied Optics