Commit 17ceb0b

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fix: Modify some expressions in the thresholding tutorial

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Original file line number	Diff line number	Diff line change
`@@ -35,7 +35,7 @@ cv2.waitKey(0)`
`35`	`35`
`36`	`36`	`- 参数1:要处理的原图,一般是灰度图`
`37`	`37`	`- 参数2:设定的阈值`
`38`		`-- 参数3:最大阈值,一般为255`
	`38`	+- 参数3:对于`THRESH_BINARY`、`THRESH_BINARY_INV`阈值方法所选用的最大阈值,一般为255
`39`	`39`	`- 参数4:阈值的方式,主要有5种,详情:[ThresholdTypes](https://docs.opencv.org/4.0.0/d7/d1b/group__imgproc__misc.html#gaa9e58d2860d4afa658ef70a9b1115576)`
`40`	`40`
`41`	`41`	`下面结合代码理解下这5种阈值方式:`
`@@ -102,7 +102,7 @@ plt.show()`
`102`	`102`	`- 参数3:小区域阈值的计算方式`
`103`	`103`	- `ADAPTIVE_THRESH_MEAN_C`:小区域内取均值
`104`	`104`	- `ADAPTIVE_THRESH_GAUSSIAN_C`:小区域内加权求和,权重是个高斯核
`105`		`-- 参数4:阈值方式(跟前面讲的那5种相同)`
	`105`	+- 参数4:阈值方法,只能使用`THRESH_BINARY`、`THRESH_BINARY_INV`,具体见前面所讲的阈值方法
`106`	`106`	`- 参数5:小区域的面积,如11就是11*11的小块`
`107`	`107`	`- 参数6:最终阈值等于小区域计算出的阈值再减去此值`
`108`	`108`

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