期刊
MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING
卷 33, 期 1, 页码 121-142出版社
SPRINGER
DOI: 10.1007/s11045-021-00794-9
关键词
Depth from focus; Focus measure; Depth estimation
资金
- JSPS (Japan Society for the Promotion of Science) KAKENHI, Japan [JP18K11351]
The study proposes a depth estimation method using approximate calculation and pixel-wise processing, which reduces memory usage, improves processing speed, and enhances depth estimation accuracy.
Depth-from-focus methods can estimate the depth from a set of images taken with different focus settings. We recently proposed a method that uses the relationship of the ratio between the luminance value of a target pixel and the mean value of the neighboring pixels. This relationship has a Poisson distribution. Despite its good performance, the method requires a large amount of memory and computation time because it needs to store focus measurement values for each depth and each window radius on a pixel-wise basis, and filtering to compute the mean value, which is performed twice, makes the relationship among neighboring pixels too strong to parallelize the pixel-wise processing. In this paper, we propose an approximate calculation method that can give almost the same results with a single time filtering operation and enables pixel-wise parallelization. This pixel-wise processing does not require the aforementioned focus measure values to be stored, which reduces the amount of memory. Additionally, utilizing the pixel-wise processing, we propose a method of determining the process window size that can improve noise tolerance and in depth estimation in texture-less regions. Through experiments, we show that our new method can better estimate depth values in a much shorter time.
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