中文说明：
gabor滤波器应用由高斯函数调制的正弦函数。它在图像处理中具有轮廓（或笔划）检测功能。这个插件有一个参数：波长（以像素为单位）和方向（以度为单位）。他也用信封。
English Description：
Gabor filter applies sine function modulated by Gaussian function. It has the function of contour (or stroke) detection in image processing. The plug-in has one parameter: wavelength (in pixels) and direction (in degrees). He also uses envelopes