模糊和散射对闪光照相边界检测的影响

张绚; 刘军; 危才华; 张小琳; 刘进

doi:10.11884/HPLPB201830.170239

模糊和散射对闪光照相边界检测的影响

doi: 10.11884/HPLPB201830.170239

中国工程物理研究院流体物理研究所, 四川绵阳 621900

基金项目:

国防基金项目 TB0405

国家自然科学基金项目 11304295

详细信息

作者简介:
张绚(1984-), 男，硕士，主要从事闪光照相研究；realcheung@163.com

中图分类号: OR814.3;O434.1
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- 文章访问数: 1320
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- 被引次数: 0
出版历程
- 收稿日期: 2017-04-26
- 修回日期: 2017-08-15
- 刊出日期: 2018-03-15

Effects of blur and scattering on boundary detection of flash radiography

Institute of Fluid Physics, CAEP, P.O.Box 919-105, Mianyang 621900, China

摘要

摘要: 借助蒙特卡罗方法模拟闪光照相过程，研究了模糊和散射因素对边界检测的影响。结果表明：模糊与边界退化量的变化关系依赖于相邻飞层的材料、密度和尺寸；相同客体结构下，模糊越大，边界退化量也越大；客体结构不同，相同模糊下的边界退化量也不同；散直比越大，散射对边界检测结果的影响也越大，当散直比大于50时，散射引起的边界检测误差超过1个像素。
- 闪光照相 /
- 蒙特卡罗方法 /
- 图像退化 /
- 边界检测 /
- 模糊 /
- 散射
Abstract: Owing to the effect of non-ideal factors in the imaging process, X-ray photographic image quality is degraded, resulting in a shift of image boundary position relative to that of the object. In this paper, the Monte Carlo method is used to simulate the flash photography process, and the influence of fuzzy and scattering on the boundary detection is studied. The result shows that the relationship between the blur size and the boundary deviation is dependent on the material, density and size of adjacent layers; under the same object structure, the larger the blur, the greater the boundary deviation; when the object structure is different, the boundary deviation is also different with the same blur size. The greater the ratio of scatter to direct, the greater the effect of scattering on the boundary detection results. When the ratio is greater than 50, the boundary detection error caused by scattering is more than one pixel.
- flash radiography /
- Monte Carlo method /
- image degradation /
- boundary detection /
- fuzzy /
- scattering

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图 1 模糊引起边界退化

Figure 1. Boundary deviation due to blur

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图 2 边界退化量与模糊量关系

Figure 2. Boundary deviation with blur size

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图 3 不同材料的边界退化量与模糊之间关系

Figure 3. Relationship between deviation and blur size with different materials

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图 4 密度变化对边界退化量影响

Figure 4. Influence of density variation on boundary deviation

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图 5 客体尺寸对边界退化影响

Figure 5. Influence of object size on boundary deviation

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图 6 三种闪光照相系统布局示意图

Figure 6. Layout of three flash photography systems

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图 7 MC模拟结果

Figure 7. Simulation results with MC method

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表 1 采用case 1照相布局散直比为9.3下散射对边界检测结果影响

Table 1. Scatter influencing edge detection with case 1 and ratio of scatter to direct is 9.3

	direct image/mm	total image including scattering/mm	absolute error /mm
boundaryⅠ	11.235	11.336	0.101
boundaryⅡ	43.962	43.988	0.026
boundaryⅢ	64.026	64.027	0.001

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表 2 采用case 1照相布局散直比为37.9下散射对边界检测结果影响

Table 2. Scatter influencing edge detection with case 1 and ratio of scatter to direct is 37.9

	direct image/mm	total image including scattering/mm	absolute error /mm
boundaryⅠ	11.201	11.224	0.023
boundaryⅡ	43.958	44.040	0.082
boundaryⅢ	64.061	64.065	0.004

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表 3 采用case 1照相布局散直比为58.3下散射对边界检测结果影响

Table 3. Scatter influencing edge detection with case 1 and ratio of scatter to direct is 58.3

	direct image/mm	total image including scattering/mm	absolute error /mm
boundaryⅠ	11.124	11.413	0.289
boundaryⅡ	43.948	44.064	0.116
boundaryⅢ	64.055	64.061	0.006

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表 4 采用case 1照相布局散直比为101下散射对边界检测结果影响

Table 4. Scatter influencing edge detection with case 1 and ratio of scatter to direct is 101

	direct image/mm	total image including scattering/mm	absolute error /mm
boundary Ⅰ	11.288	10.414	-0.874
boundary Ⅱ	43.946	44.149	0.203
boundary Ⅲ	64.048	64.061	0.013

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表 5 采用case 2照相布局散直比为1.6下直穿图像与含散射图像边界结果比较

Table 5. Results of scatter influencing edge detection with case 2 and ratio of scatter to direct is 1.6

	direct image/mm	total image including scattering/mm	absolute error/mm
boundary Ⅰ	6.150	6.150	0
boundary Ⅱ	21.478	21.479	0.001
boundary Ⅲ	31.539	31.539	0

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表 6 采用case 2照相布局散直比为15.9下散射对边界检测结果影响

Table 6. Results of scatter influencing edge detection with case 2 and ratio of scatter to direct is 15.9

	direct image/mm	total image including scattering/mm	absolute error /mm
boundary Ⅰ	6.150	6.152	0.002
boundary Ⅱ	21.474	21.482	0.008
boundary Ⅲ	31.539	31.541	0.002

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表 7 采用case 2照相布局散直比为23.6下散射对边界检测结果影响

Table 7. Results of scatter influencing edge detection with case 2 and ratio of scatter to direct is 23.6

	direct image/mm	total image including scattering/mm	absolute error /mm
boundary Ⅰ	6.151	6.150	-0.001
boundary Ⅱ	21.477	21.477	0
boundary Ⅲ	31.538	31.538	0

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表 8 采用case 2照相布局散直比为35.1下散射对边界检测结果影响

Table 8. Results of scatter influencing edge detection with case 2 and ratio of scatter to direct is 35.1

	direct image/mm	total image including scattering/mm	absolute error /mm
boundary Ⅰ	6.147	6.150	0.003
boundary Ⅱ	21.478	21.522	0.044
boundary Ⅲ	31.548	31.556	0.008

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表 9 case 3情况下直穿图像与含散射图像边界结果比较

Table 9. Results of scatter influencing edge detection with case 3 and ratio of scatter to direct is 6.7

	direct image/mm	total image including scattering/mm	absolute error /mm
boundary Ⅰ	11.201	11.189	-0.012
boundary Ⅱ	44.057	44.057	0
boundary Ⅲ	64.231	64.231	0

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