摘要 :
Natural three-dimensional images can be produced by displaying a large number of directional images with directional rays. Directional images are orthographic projections of a three-dimensional object and are displayed with nearly...
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Natural three-dimensional images can be produced by displaying a large number of directional images with directional rays. Directional images are orthographic projections of a three-dimensional object and are displayed with nearly parallel rays. We have already constructed 64-directional, 72-directional, and 128-directional natural three-dimensional displays whose angle sampling pitches of horizontal ray direction are 0.34°, 0,38°, and 0.25°, respectively. In this study we constructed a rotating camera system to capture 360° three-dimensional information of an actual object. An object is located at the center of rotation and a camera mounted at the end of an arm is rotated around an object. A large number of images are captured from different horizontal directions with a small rotation angle interval. Because captured images are perspective projections of an object, directional images are generated by interpolating the captured images. The 360° directional image consists of 1,059, 947, and 1,565 directional images corresponding to the three different displays. When the number of captured images is about ～ 4,000, the directional images can be generated without the image interpolation so that correct directional images are obtained. The degradation of the generated 360° directional image depending on the number of captured images is evaluated. The results show that the PSNR is higher than 35 dB when more than 400 images are captured. With the 360° directional image, the three-dimensional images can be interactively rotated on the three-dimensional display. The data sizes of the 360° directional images are 233 MB, 347 MB, and 344 MB, respectively. Because the directional images for adjacent horizontal directions are very similar, 360° directional image can be compressed using the conventional movie compression algorithms. We used H.264 CODEC and achieved the compression ratio 1.5 % with PSNR > 35 dB.
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摘要 :
Natural three-dimensional images can be produced by displaying a large number of directional images with directional rays. Directional images are orthographic projections of a three-dimensional object and are displayed with nearly...
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Natural three-dimensional images can be produced by displaying a large number of directional images with directional rays. Directional images are orthographic projections of a three-dimensional object and are displayed with nearly parallel rays. We have already constructed 64-directional, 72-directional, and 128-directional natural three-dimensional displays whose angle sampling pitches of horizontal ray direction are 0.34°, 0,38°, and 0.25°, respectively. In this study we constructed a rotating camera system to capture 360° three-dimensional information of an actual object. An object is located at the center of rotation and a camera mounted at the end of an arm is rotated around an object. A large number of images are captured from different horizontal directions with a small rotation angle interval. Because captured images are perspective projections of an object, directional images are generated by interpolating the captured images. The 360° directional image consists of 1,059, 947, and 1,565 directional images corresponding to the three different displays. When the number of captured images is about ～ 4,000, the directional images can be generated without the image interpolation so that correct directional images are obtained. The degradation of the generated 360° directional image depending on the number of captured images is evaluated. The results show that the PSNR is higher than 35 dB when more than 400 images are captured. With the 360° directional image, the three-dimensional images can be interactively rotated on the three-dimensional display. The data sizes of the 360° directional images are 233 MB, 347 MB, and 344 MB, respectively. Because the directional images for adjacent horizontal directions are very similar, 360° directional image can be compressed using the conventional movie compression algorithms. We used H.264 CODEC and achieved the compression ratio 1.5 % with PSNR > 35 dB.
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摘要 :
Natural three-dimensional images can be produced by displaying a large number of directional images with directional rays. Directional images are orthographic projections of a three-dimensional object and are displayed with nearly...
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Natural three-dimensional images can be produced by displaying a large number of directional images with directional rays. Directional images are orthographic projections of a three-dimensional object and are displayed with nearly parallel rays. We have already constructed 64-directional, 72-directional, and 128-directional natural three-dimensional displays whose angle sampling pitches of horizontal ray direction are 0.34? 0,38? and 0.25? respectively. In this study we constructed a rotating camera system to capture 360?three-dimensional information of an actual object. An object is located at the center of rotation and a camera mounted at the end of an arm is rotated around an object. A large number of images are captured from different horizontal directions with a small rotation angle interval. Because captured images are perspective projections of an object, directional images are generated by interpolating the captured images. The 360?directional image consists of 1,059, 947, and 1,565 directional images corresponding to the three different displays. When the number of captured images is about ~ 4,000, the directional images can be generated without the image interpolation so that correct directional images are obtained. The degradation of the generated 360?directional image depending on the number of captured images is evaluated. The results show that the PSNR is higher than 35 dB when more than 400 images are captured. With the 360?directional image, the three-dimensional images can be interactively rotated on the three-dimensional display. The data sizes of the 360?directional images are 233 MB, 347 MB, and 344 MB, respectively. Because the directional images for adjacent horizontal directions are very similar, 360?directional image can be compressed using the conventional movie compression algorithms. We used H.264 CODEC and achieved the compression ratio 1.5 % with PSNR > 35 dB.
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A new type of computational three-dimensional (3D) reconstruction in the condition of low light level has been proposed using a planar catadioptric method based on the principle of computational photon counting integral imaging te...
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A new type of computational three-dimensional (3D) reconstruction in the condition of low light level has been proposed using a planar catadioptric method based on the principle of computational photon counting integral imaging technique. Only one camera and one shot are employed for photon counting integral imaging, rather than multiple sensors or dynamic movement in previous works. A 3D planar catadioptric photon counting method has been demonstrated under photon staved condition while the 3D scenes can be successfully reconstructed.
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A new 3D display technique which does not require wearing 3D glasses and also provides natural 3D images is presented. The measurements of ocular functions and the developments of a 3D camera and a 3D interactive image processor ...
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A new 3D display technique which does not require wearing 3D glasses and also provides natural 3D images is presented. The measurements of ocular functions and the developments of a 3D camera and a 3D interactive image processor are also presented.
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We describe several optoelectronic methods based in digital holography for recognition of three-dimensional (3D) images. The phase and amplitude of a Fresnel diffraction pattern of a 3D reference object is measured with digital ho...
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We describe several optoelectronic methods based in digital holography for recognition of three-dimensional (3D) images. The phase and amplitude of a Fresnel diffraction pattern of a 3D reference object is measured with digital holography. This complex information is compared with that coming from a similar digital hologram of a 3D input scene using correlation techniques. In this way, the method allows us to detect the presence of the 3D reference object in the 3D input scene with high discrimination. Pattern recognition techniques that are shift-variant or shift-invariant along the optical axis are described. In the later case it is possible to detect the 3D position of the reference in the input scene with high accuracy. Using the information contained in the digital holograms it is also possible to measure small 3D orientation changes of a 3D object. Experimental results are presented.
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摘要 :
We describe several optoelectronic methods based in digital holography for recognition of three-dimensional (3D) images. The phase and amplitude of a Fresnel diffraction pattern of a 3D reference object is measured with digital ho...
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We describe several optoelectronic methods based in digital holography for recognition of three-dimensional (3D) images. The phase and amplitude of a Fresnel diffraction pattern of a 3D reference object is measured with digital holography. This complex information is compared with that coming from a similar digital hologram of a 3D input scene using correlation techniques. In this way, the method allows us to detect the presence of the 3D reference object in the 3D input scene with high discrimination. Pattern recognition techniques that are shift-variant or shift-invariant along the optical axis are described. In the later case it is possible to detect the 3D position of the reference in the input scene with high accuracy. Using the information contained in the digital holograms it is also possible to measure small 3D orientation changes of a 3D object. Experimental results are presented.
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In this paper, we propose a visual quality enhancement of 3D reconstruction algorithm in integral imaging. Conventional integral imaging has a critical problem that attenuates the visual quality of 3D objects when low-resolution e...
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In this paper, we propose a visual quality enhancement of 3D reconstruction algorithm in integral imaging. Conventional integral imaging has a critical problem that attenuates the visual quality of 3D objects when low-resolution elemental images are used. Although, PERT is one of the solutions, the size of 3D scenes is different from optical reconstruction since it is not considering space between back-projected pixels on reconstruction planes. Therefore, we consider this space and use convolution operator. Especially, convolution operator can be designed by considering aperture shapes. To support our proposed method, we carry out optical experiment and computer simulations.
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In this paper, we propose a visual quality enhancement of 3D reconstruction algorithm in integral imaging. Conventional integral imaging has a critical problem that attenuates the visual quality of 3D objects when low-resolution e...
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In this paper, we propose a visual quality enhancement of 3D reconstruction algorithm in integral imaging. Conventional integral imaging has a critical problem that attenuates the visual quality of 3D objects when low-resolution elemental images are used. Although, PERT is one of the solutions, the size of 3D scenes is different from optical reconstruction since it is not considering space between back-projected pixels on reconstruction planes. Therefore, we consider this space and use convolution operator. Especially, convolution operator can be designed by considering aperture shapes. To support our proposed method, we carry out optical experiment and computer simulations.
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Conventional integral imaging systems utilize lenslet arrays with fixed focal lengths and aperture sizes. In this paper, we propose a time-multiplexed integral imaging method to enhance both the depth of focus and the resolution o...
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Conventional integral imaging systems utilize lenslet arrays with fixed focal lengths and aperture sizes. In this paper, we propose a time-multiplexed integral imaging method to enhance both the depth of focus and the resolution of a three-dimensional image by displaying it using an array of lenslets with different focal lengths and aperture sizes. The non-uniform lenslet parameters (focal lengths and aperture sizes) for our method are calculated. Our theoretical analysis indicates that significant improvements in both depth of focus and resolution can be obtained using the proposed technique. To the best of our knowledge, this is a first report on developing integral imaging systems using lenslets with non-uniform focal lengths and aperture sizes.
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