【摘要】 提取Zernike矩的幅值作为字符的模式特征具有旋转不变性,但单位圆半径的选择对特征计算影响较大。本文提出一种根据字符外部边框信息计算最佳单位圆半径的归一化方法。经实验证明该方法能保证单位圆合适地把整个字符包含在内,同时由于单位圆半径不变使数字图像离散化对Zernike矩旋转不变性的影响降到最低。更多还原

【Abstract】 The character’s pattern feature extracted from Zernike moment amplitude has rotation invariance, but the choice of unit circle radius affect the feature directly. The article presents a normalization method that can obtain the best unit circle radius based on information of character’s contour. Experiments demonstrated that the radius could cover the whole character properly by this method, at same time, because of radius invariance the influence of digital image’s discretization on rotation invariance of Zernike moment was reduced to the smallest level.更多还原