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    • 4. 发明授权
    • Apparatus and method for processing of digital images
    • 数字图像处理装置及方法
    • US06760401B2
    • 2004-07-06
    • US10215692
    • 2002-08-09
    • Georg SchmitzTil AachPeter Maria Johannes RongenHerman Stegehuis
    • Georg SchmitzTil AachPeter Maria Johannes RongenHerman Stegehuis
    • G01N23083
    • G06T5/50G06T7/0012G06T2207/30101
    • This invention relates to an apparatus and method for improved display of small dark structures such as in particular coronary blood vessels in digital X-ray images. A live image (S) is initially subjected to multiscale decomposition in which firstly multiple uses of low pass filtering with subsequent resolution reduction (RED), and secondly resolution increases using subsequent low pass filtration (EXP), give detailed images (D1, D2, D3, D4) of different resolution. In accordance with the first variant of the method, a mask (M) representative of the uninteresting image background is subtracted from the detailed image (D4) having the lowest degree of resolution. This ensures that the subtraction will only comprise correspondingly coarse structures with dimensions greater than the expected image motion. A further improvement can be achieved by applying a motion estimation (MOT EST) and motion compensation (MOT COMP) to the mask (M) and to the detailed image (D4) of the lowest degree of resolution. The detailed images (D1-D4) may be multiplied by factors (c2) before they are combined to form the overall image (G). For this purpose, asymmetrical intensification functions are preferably used, so that negative contrast values corresponding to small dark structures can be intensified and positive contrast values can be suppressed.
    • 本发明涉及一种用于改进数字X射线图像中特别是冠状血管的小黑暗结构的显示的装置和方法。 实时图像(S)最初经受多尺度分解,其中首先多次使用低通滤波,随后进行分辨率降低(RED),其次分辨率随后的低通滤波(EXP)增加,给出详细图像(D1,D2, D3,D4)不同分辨率。 根据该方法的第一变型,从具有最低分辨率的详细图像(D4)中减去代表不感兴趣的图像背景的掩码(M)。 这确保了减法将仅包括具有大于预期图像运动的尺寸的对应粗略结构。 另外,通过将运动估计(MOT EST)和运动补偿(MOT COMP)应用于最低分辨率的掩模(M)和详细图像(D4)可以实现进一步的改进。 详细图像(D1-D4)可以在它们组合之前乘以因子(c2)以形成整体图像(G)。 为此,优选使用非对称增强功能,从而可以增强对应于小暗结构的负对比度值,并且可以抑制正对比度值。