halcon学习之阈值算子threshold operators

图像预处理少不了阈值分割，去除不需要的图片特征，增强图片的目标特征，halcon有一系列操作算子。啃纯英的说明书，真是

auto_threshold	Segment an image using thresholds determined from its histogram.
binary_threshold	Segment an image using binary thresholding. 二值化
char_threshold	Perform a threshold segmentation for extracting characters. 区分字符（有光暗阴影）
check_difference	Compare two images pixel by pixel. 一个一个像素比较两张图片
dual_threshold	Threshold operator for signed images.
dyn_threshold	Segment an image using a local threshold.
fast_threshold	Fast thresholding of images using global thresholds.
histo_to_thresh	Determine gray value thresholds from a histogram. 灰度直方图
local_threshold	Segment an image using local thresholding.
threshold	Segment an image using global threshold.
threshold_sub_pix	Extract level crossings from an image with subpixel accuracy.
var_threshold	Threshold an image by local mean and standard deviation analysis.
zero_crossing	Extract zero crossings from an image.
zero_crossing_sub_pix	Extract zero crossings from an image with subpixel accuracy.

 

 

 

 

对于不同的图片，有不同的效果