METHOD AND SYSTEM FOR DETERMINING OPTIMAL EXPOSURE OF STRUCTURED LIGHT BASED 3D CAMERA
First Claim
1. A method for determining an optimal exposure of a structured light based three dimensional (3D) camera system including a projecting means for illuminating a predetermined pattern on a target object, an image capturing means for capturing an image of the target object with the pattern projected, and a processing means for reconstructing 3D data based on the captured image, wherein the method automatically determines an optimal exposure level of the structured light based 3D camera system through analyzing the captured image of the target object.
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Abstract
Provided are a method and system for determining an optimal exposure of a structured light based 3D camera. The system includes a projecting means for illuminating a predetermined pattern on a target object, an image capturing means for capturing an image of the target object with the pattern projected, and a processing means for reconstructing 3D data for the target object by identifying the pattern of the captured images from the image capturing means. The system automatically determines an optimal exposure of the structured light based 3D camera system through analyzing the captured image of the target object.
50 Citations
11 Claims
- 1. A method for determining an optimal exposure of a structured light based three dimensional (3D) camera system including a projecting means for illuminating a predetermined pattern on a target object, an image capturing means for capturing an image of the target object with the pattern projected, and a processing means for reconstructing 3D data based on the captured image, wherein the method automatically determines an optimal exposure level of the structured light based 3D camera system through analyzing the captured image of the target object.
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8. A system for determining an optimal exposure of a structured light based three dimensional (3D) camera system, comprising:
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a projecting means for illuminating a predetermined pattern on a target object; an image capturing means for capturing an image of the target object with the pattern projected; and a processing means for calculating 3D data for the target object by identifying the pattern of the captured images from the image capturing means, wherein the processing means sequentially performs operation including the steps of; a) obtaining an image of a target object with a predetermined pattern projected thereon, which is illuminated from a projecting means, and an image of the target object without a predetermined pattern projected thereon; b) dividing an intensity of a corresponding pixel into red intensity, green intensity, and blue intensity of three channels (R, G, B) for one same pixel at each of the captured images, and generating a characteristic curve for each of the three channels for showing the intensity of a pixel for each channel according to variation of exposure levels; c) estimating intensity I of the corresponding pixel according to variation of exposure levels using the generated characteristic curves, and calculating an intensity difference Δ
I or a brightness ratio SNR between the image of the target object with the predetermined pattern projected and the image of the target object without the predetermined pattern for the corresponding pixel using the estimated intensity;d) collecting brightness data about intensity differences Δ
I or brightness ratios SNR according to variation of exposure levels for all pixels by repeating the steps b) and c) for all pixels of each image;e) discriminating pixels with spread phenomenon (saturation) occurred or the pixels without the predetermined pattern projected when the projecting means projects the predetermined pattern from the collected brightness data and excluding the brightness data of the discriminated pixels; and f) calculating the number of pixels having an intensity difference Δ
I and a brightness ratio SNR exceeding a predetermined threshold Δ
Ith or SNRth at every exposure levels using the brightness data filtered at the step e) and deciding an exposure level having a largest calculated number of pixels as an optimal exposure level. - View Dependent Claims (9, 10)
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11. A method for generating a characteristic curve of a structured light based three dimensional (3D) camera system including a projecting means for illuminating a predetermined pattern on a target object, an image capturing means for capturing an image of the target object with the pattern projected, and a processing means for reconstructing 3D data using the captured image, the method comprising the steps of:
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a) capturing an image of a target image with a predetermined pattern projected thereon from the projecting means and another image of the target object without the predetermined pattern projected thereon; b) calculating proportional factors kR, kG, and kB by applying an exposure applied for capturing the images in the step a) and red intensity, green intensity, and blue intensity of a red channel, a green channel, and a blue channel measured for one same pixel in each of the captured images to an equation;
IR=kR*E, IG=kG*E, IB=kB*E, where IR, IG, and IB denote the intensities in R, G, and B channels, kR, kG, and kB denote a proportional factor, and E denotes an exposure;c) calculating intensities of a corresponding pixel for input exposures by applying various exposures to the equation; d) generating a graph by corresponding the calculated intensities to the input exposures using the data obtained in the step c).
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Specification