公开(公告)号：US6078680A

公开(公告)日：2000-06-20

申请号：US900191

申请日：1997-07-25

申请人： Hiroyuki Yoshida ,  Shigehiko Katsuragawa ,  Yali Amit ,  Kunio Doi

发明人： Hiroyuki Yoshida ,  Shigehiko Katsuragawa ,  Yali Amit ,  Kunio Doi

IPC分类号： G06K9/64 ,  G06T7/00 ,  G06K9/00

CPC分类号： G06K9/6206 ,  G06T7/0012

摘要： A method and apparatus for discrimination of nodules and false positives in digital chest radiographs, using a wavelet snake technique. The wavelet snake is a deformable contour designed to identify the boundary of a relatively round object. The shape of the snake is determined by a set of wavelet coefficients in a certain range of scales. Portions of the boundary of a nodule are first extracted using a multiscale edge representation. The multiscale edges are then fitted by a gradient descent procedure which deforms the shape of a wavelet snake by changing its wavelet coefficients. The degree of overlap between the fitted snake and the multiscale edges is calculated and used as a fit quality indicator for discrimination of nodules and false detections.

摘要翻译： 使用小波蛇技术在数字胸片中鉴别结节和假阳性的方法和装置。 小波蛇是一种可变形轮廓，用于识别相对圆形物体的边界。 蛇的形状由一定范围的小波系数确定。 首先使用多尺度边缘表示提取结节边界的部分。 然后通过梯度下降过程来拟合多尺度边缘，该过程通过改变其小波系数来变形小波蛇的形状。 计算拟合蛇和多尺度边缘之间的重叠程度，并将其用作辨别结节和假检测的拟合质量指标。