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basics png

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`@@ -1,3 +1,5 @@`
	`1`	`+![basics](OpenCV-axis-basics.png "basics")`
	`2`	`+`
`1`	`3`
`2`	`4`	`关于图像坐标系与行列宽高的对应关系大致如下:`
`3`	`5`	`- row == height == Point.y`

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`@@ -35,6 +35,7 @@`
`35`	`35`	`print('bgr:',b,g,r)`
`36`	`36`
`37`	`37`	`#先行后列`
	`38`	`+#img[y:y+height,x:width]`
`38`	`39`	`img[100:100 + logo.shape[0], 300:300 + logo.shape[1]] = logo[:, :, 0:3]# 两张图片的shape不一样`
`39`	`40`	`# img[10:10+logo.shape[0],30:30+logo.shape[1],:]=logo[:,:,0:3]`
`40`	`41`	`img[300:300 + logo.shape[1], 100:100 + logo.shape[0]] = butterfly[:, :, 0:3]`

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