首页>
外国专利>
System and method for determining a threshold for edge detection based on an undifferentiated equalized scan line signal
System and method for determining a threshold for edge detection based on an undifferentiated equalized scan line signal
展开▼
机译:用于基于未差分的均衡扫描线信号确定边缘检测阈值的系统和方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
Methods and systems better detect edges in a binary optical code, such as a bar code. One method constructs a threshold signal to be used for comparison with an equalized undifferentiated scan line signal imperfectly representing a binary optical code. The method comprises detecting peaks in the equalized undifferentiated scan line signal; determining midpoints between successive detected peaks; and generating a smooth signal based on the midpoints. The generated signal is the threshold signal. In one version of the method, the generating step comprises interpolating between successive midpoints so as to result in a signal passing through the midpoints and low-pass filtering the signal passing through the midpoints so as to result in a filtered signal, which is the threshold signal. In another version of the method, the generating step comprises performing regression using the midpoints so as to generate a signal curve that fits the midpoints according to a criterion. Software, digital, and analog techniques are described.
展开▼