Method for reconstructing flame CT (computed tomography) images with adaptive section sizes
A CT image, self-adaptive technology, applied in image data processing, 2D image generation, 3D modeling, etc., to reduce the effect of light bands, improve reconstruction speed, and simplify dimensions
Inactive Publication Date: 2014-08-06
TIANJIN UNIV
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[0005] Under certain hardware conditions, in order to reduce the influence of the slice light band and improve the reconstruction speed of the two-dimensional slice, it can only be improved from the perspective of the algorithm.
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[0022] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0023] Such as Figure 4 As shown in the algorithm flow, the specific method of the flow is as follows:
[0024] (1) Extract the foreground image
[0025] For the captured flame projection image, firstly, preprocessing is carried out to eliminate the noise caused by environmental factors. Since the noise is usually random, Gaussian smoothing filter is used to remove the noise. For an RGB flame image, we usually reconstruct the red, green and blue channels of RGB respectively, and then synthesize the slices generated by the three channels. In order to facilitate the statement of the algorithm, we assume that the RGB image is converted to grayscale first, and the converted grayscale image is used for reconstruction. Taking advantage of the large difference between the flame foreground image and the background image, an adaptive global thre...
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The invention discloses a method for reconstructing flame CT (computed tomography) images with adaptive section sizes. The method comprises the following steps of (1) extracting a foreground image; (2) establishing a ray linear equation and calculating the weight of a section unit; and (3) generating a section. By using the method, the actual range of flame on two-dimensional sections can be determined according to a projection image of the flame, effective surface elements of the sections on a reconstructed flame object are adaptively selected, so that CT reconstruction speed is increased, and influences on light bands are reduced; the method actually plays an important role in three-dimensional reconstruction of flame of which the geometrical shape is continuously changed in the aspects of the space and the time, for example, the shapes of the flames of a candle or a burner are different on space height, and the flame is outwards expanded and diffused along with time when an internal combustion engine is ignited; by using the method, the dimension of a linear system of equations is simplified, and the reconstruction speed is increased; and the effective surface elements are limited by extracting the foreground, the influences on the light bands are reduced, and the reconstruction quality of the two-dimensional sections is improved.
Description
technical field [0001] The invention relates to the field of three-dimensional reconstruction of images, in particular to the three-dimensional reconstruction of internal field distribution of flames in the field of flame combustion. Background technique [0002] At present, more and more technicians have begun to use computer tomography technology to conduct three-dimensional reconstruction research on transparent or translucent objects such as flames, and use several synchronous CCD cameras to capture the target object from several different angles. Projected images in all directions, and then use these projected images to reconstruct the three-dimensional field distribution inside the target object using an appropriate mathematical optimization method. The schematic diagram of the experimental device is as follows: figure 1 shown. This has a similar principle to the medical computed tomography (Computed Tomography, CT). Medical CT is based on the use of X-ray and other ...
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Inventor 张淑芳张聪李瑞张金丽
Owner TIANJIN UNIV