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Multi-sensor fusion of infrared and electro-optic signals for high resolution night images.

Huang X, Netravali R, Man H, Lawrence V - Sensors (Basel) (2012)

Bottom Line: The framework requires four main steps: (1) inverse filter-based IR image transformation; (2) EO image edge detection; (3) registration; and (4) blending/superimposing of the obtained image pair.Simulation results show both blended and superimposed IR images, and demonstrate that blended IR images have better quality over the superimposed images.Additionally, based on the same steps, simulation result shows a blended IR image of better quality when only the original IR image is available.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical and Computer Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA. xhuang3@stevens.edu

ABSTRACT
Electro-optic (EO) image sensors exhibit the properties of high resolution and low noise level at daytime, but they do not work in dark environments. Infrared (IR) image sensors exhibit poor resolution and cannot separate objects with similar temperature. Therefore, we propose a novel framework of IR image enhancement based on the information (e.g., edge) from EO images, which improves the resolution of IR images and helps us distinguish objects at night. Our framework superimposing/blending the edges of the EO image onto the corresponding transformed IR image improves their resolution. In this framework, we adopt the theoretical point spread function (PSF) proposed by Hardie et al. for the IR image, which has the modulation transfer function (MTF) of a uniform detector array and the incoherent optical transfer function (OTF) of diffraction-limited optics. In addition, we design an inverse filter for the proposed PSF and use it for the IR image transformation. The framework requires four main steps: (1) inverse filter-based IR image transformation; (2) EO image edge detection; (3) registration; and (4) blending/superimposing of the obtained image pair. Simulation results show both blended and superimposed IR images, and demonstrate that blended IR images have better quality over the superimposed images. Additionally, based on the same steps, simulation result shows a blended IR image of better quality when only the original IR image is available.

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Related in: MedlinePlus

Two edge detection results of EO images via the Canny edge operator. (a) Original EO Image 1; (b) Detected edge of EO Image 1; (c) Original EO Image; (d) Detected edge of EO Image 2; (e) Detected edge of IR Image 2.
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f4-sensors-12-10326: Two edge detection results of EO images via the Canny edge operator. (a) Original EO Image 1; (b) Detected edge of EO Image 1; (c) Original EO Image; (d) Detected edge of EO Image 2; (e) Detected edge of IR Image 2.

Mentions: Figure 4 shows two edge detection results of EO images via the Canny edge operator, where sigma = 1, T1 = 0.04 and T2 = 0.09. Observed from the obtained results, we can find out that the edge-detected images are clean, and results cover all main edges of objects in original EO images.


Multi-sensor fusion of infrared and electro-optic signals for high resolution night images.

Huang X, Netravali R, Man H, Lawrence V - Sensors (Basel) (2012)

Two edge detection results of EO images via the Canny edge operator. (a) Original EO Image 1; (b) Detected edge of EO Image 1; (c) Original EO Image; (d) Detected edge of EO Image 2; (e) Detected edge of IR Image 2.
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Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC3472830&req=5

f4-sensors-12-10326: Two edge detection results of EO images via the Canny edge operator. (a) Original EO Image 1; (b) Detected edge of EO Image 1; (c) Original EO Image; (d) Detected edge of EO Image 2; (e) Detected edge of IR Image 2.
Mentions: Figure 4 shows two edge detection results of EO images via the Canny edge operator, where sigma = 1, T1 = 0.04 and T2 = 0.09. Observed from the obtained results, we can find out that the edge-detected images are clean, and results cover all main edges of objects in original EO images.

Bottom Line: The framework requires four main steps: (1) inverse filter-based IR image transformation; (2) EO image edge detection; (3) registration; and (4) blending/superimposing of the obtained image pair.Simulation results show both blended and superimposed IR images, and demonstrate that blended IR images have better quality over the superimposed images.Additionally, based on the same steps, simulation result shows a blended IR image of better quality when only the original IR image is available.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical and Computer Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA. xhuang3@stevens.edu

ABSTRACT
Electro-optic (EO) image sensors exhibit the properties of high resolution and low noise level at daytime, but they do not work in dark environments. Infrared (IR) image sensors exhibit poor resolution and cannot separate objects with similar temperature. Therefore, we propose a novel framework of IR image enhancement based on the information (e.g., edge) from EO images, which improves the resolution of IR images and helps us distinguish objects at night. Our framework superimposing/blending the edges of the EO image onto the corresponding transformed IR image improves their resolution. In this framework, we adopt the theoretical point spread function (PSF) proposed by Hardie et al. for the IR image, which has the modulation transfer function (MTF) of a uniform detector array and the incoherent optical transfer function (OTF) of diffraction-limited optics. In addition, we design an inverse filter for the proposed PSF and use it for the IR image transformation. The framework requires four main steps: (1) inverse filter-based IR image transformation; (2) EO image edge detection; (3) registration; and (4) blending/superimposing of the obtained image pair. Simulation results show both blended and superimposed IR images, and demonstrate that blended IR images have better quality over the superimposed images. Additionally, based on the same steps, simulation result shows a blended IR image of better quality when only the original IR image is available.

Show MeSH
Related in: MedlinePlus