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Adaptive color calibration based one-shot structured light system.

Zhou Y, Zhao D, Yu Y, Yuan J, Du S - Sensors (Basel) (2012)

Bottom Line: In one-shot color structured light systems, the color of stripe patterns are typically distorted with respect to color crosstalk, ambient light and the albedo of the scanned objects, leading to mismatch in the correspondence of color stripes between the projected and captured images.The adaptive color calibration, according to the relative albedo in RGB channels, can improve the accuracy of labeling stripe by alleviating the effect of albedo and ambient light while decoding the color.Furthermore, the Discrete Trend Transform in the M channel makes the color calibration an effective method for detecting weak stripes due to the uneven surfaces or reflectance characteristics of the scanned objects.

View Article: PubMed Central - PubMed

Affiliation: School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, Jiangsu, China. nackzhou@nju.edu.cn

ABSTRACT
In one-shot color structured light systems, the color of stripe patterns are typically distorted with respect to color crosstalk, ambient light and the albedo of the scanned objects, leading to mismatch in the correspondence of color stripes between the projected and captured images. In this paper, an adaptive color calibration and Discrete Trend Transform algorithm are presented to achieve high-resolution 3D reconstructions. The adaptive color calibration, according to the relative albedo in RGB channels, can improve the accuracy of labeling stripe by alleviating the effect of albedo and ambient light while decoding the color. Furthermore, the Discrete Trend Transform in the M channel makes the color calibration an effective method for detecting weak stripes due to the uneven surfaces or reflectance characteristics of the scanned objects. With this approach, the presented system is suitable for scanning moving objects and generating high-resolution 3D reconstructions without the need of dark laboratory environments.

No MeSH data available.


Related in: MedlinePlus

The cut-out of generated stripe patterns.
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f1-sensors-12-10947: The cut-out of generated stripe patterns.

Mentions: We use a modified De Bruijn sequence as the arrangement of color stripes to design the projected patterns. Suppose that D(k, n) denotes a k-array, n-order De Bruijn sequence; then, the element would be E = {0, 1, 2, 3, 4, 5}. Each element is assigned a color with a distance of 60° in hue value, as listed in Table 1. We consider that a neighbor stripe should differ by at least two channels in (R, G, B). With this constraint, only three nodes are allowed to follow one certain node. For element 0, the possible next following node should only be 1, 2 or 3. In this manner, a De Bruijn sequence with a length of 162 is generated. Figure 1 is the cut-out of the generated stripe patterns.


Adaptive color calibration based one-shot structured light system.

Zhou Y, Zhao D, Yu Y, Yuan J, Du S - Sensors (Basel) (2012)

The cut-out of generated stripe patterns.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472868&req=5

f1-sensors-12-10947: The cut-out of generated stripe patterns.
Mentions: We use a modified De Bruijn sequence as the arrangement of color stripes to design the projected patterns. Suppose that D(k, n) denotes a k-array, n-order De Bruijn sequence; then, the element would be E = {0, 1, 2, 3, 4, 5}. Each element is assigned a color with a distance of 60° in hue value, as listed in Table 1. We consider that a neighbor stripe should differ by at least two channels in (R, G, B). With this constraint, only three nodes are allowed to follow one certain node. For element 0, the possible next following node should only be 1, 2 or 3. In this manner, a De Bruijn sequence with a length of 162 is generated. Figure 1 is the cut-out of the generated stripe patterns.

Bottom Line: In one-shot color structured light systems, the color of stripe patterns are typically distorted with respect to color crosstalk, ambient light and the albedo of the scanned objects, leading to mismatch in the correspondence of color stripes between the projected and captured images.The adaptive color calibration, according to the relative albedo in RGB channels, can improve the accuracy of labeling stripe by alleviating the effect of albedo and ambient light while decoding the color.Furthermore, the Discrete Trend Transform in the M channel makes the color calibration an effective method for detecting weak stripes due to the uneven surfaces or reflectance characteristics of the scanned objects.

View Article: PubMed Central - PubMed

Affiliation: School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, Jiangsu, China. nackzhou@nju.edu.cn

ABSTRACT
In one-shot color structured light systems, the color of stripe patterns are typically distorted with respect to color crosstalk, ambient light and the albedo of the scanned objects, leading to mismatch in the correspondence of color stripes between the projected and captured images. In this paper, an adaptive color calibration and Discrete Trend Transform algorithm are presented to achieve high-resolution 3D reconstructions. The adaptive color calibration, according to the relative albedo in RGB channels, can improve the accuracy of labeling stripe by alleviating the effect of albedo and ambient light while decoding the color. Furthermore, the Discrete Trend Transform in the M channel makes the color calibration an effective method for detecting weak stripes due to the uneven surfaces or reflectance characteristics of the scanned objects. With this approach, the presented system is suitable for scanning moving objects and generating high-resolution 3D reconstructions without the need of dark laboratory environments.

No MeSH data available.


Related in: MedlinePlus