Halcon-使用图像金字塔将NCC模型与缩小图像匹配的仿射变换

问题描述

嗨，我遇到了NCC模型匹配的仿射变换问题（NumLevel 4，因为我的图像很大）。

我创建了按比例缩小图像金字塔（GenGausspyramid）的NCC模型然后在缩小图像中找到NCC模型。

有人知道如何将找到的模型区域仿射转移回原始图像（NumLevel 1）？

解决方法

我给你做了一个小演示。核心是编写逆仿射变换的地方。

代码在这里

* test image with the pattern (circle)
gen_image_const (EmptyImage,'byte',640,480)
OriginalRow :=240
OriginalColumn  := 400
OriginalRadius := 8
gen_circle (Circle,OriginalRow,OriginalColumn,OriginalRadius)
gen_circle_contour_xld (CircleXLD,OriginalRadius,6.28318,'positive',0.1)
paint_xld (CircleXLD,EmptyImage,OriginalTestImage,255)

dev_display (OriginalTestImage)
dev_set_draw ('margin')
dev_set_color ('blue')
dev_display (CircleXLD)
stop()

* creation of pyramid image
Scale := 0.5
gen_gauss_pyramid (OriginalTestImage,ImagePyramid,'weighted',Scale)

LevelIndex := 4
select_obj (ImagePyramid,Level,LevelIndex )

* ideal found circle
LevelScale := pow(Scale,LevelIndex-1)
hom_mat2d_identity (HomMat2DIdentity)
hom_mat2d_translate (HomMat2DIdentity,OriginalRow*LevelScale -OriginalRow,OriginalColumn*LevelScale - OriginalColumn,HomMat2DTranslate)
hom_mat2d_scale (HomMat2DTranslate,LevelScale,OriginalRow*LevelScale+0.5,OriginalColumn*LevelScale+0.5,HomMat2DScale)
affine_trans_contour_xld (CircleXLD,IdealFoundCircleXLD,HomMat2DScale)

* simulation of searching in the 4th level
threshold_sub_pix (Level,Border,128)
area_center_xld (Border,Area,FoundRow,FoundColumn,_)
FoundRadius:= sqrt(Area/3.14)
gen_circle_contour_xld (FoundCircleXLD,FoundRadius,0.1)

dev_display (Level)
dev_set_draw ('margin')
dev_set_color ('green')
dev_display (IdealFoundCircleXLD)
dev_set_color ('red')
dev_display (FoundCircleXLD)
stop()

* reverse affine transformation
ReverseLevelScale := pow(1/Scale,FoundRow*ReverseLevelScale -FoundRow,FoundColumn*ReverseLevelScale - FoundColumn,ReverseLevelScale,FoundRow*ReverseLevelScale+0.5,FoundColumn*ReverseLevelScale+0.5,HomMat2DScale)

affine_trans_contour_xld (IdealFoundCircleXLD,ReverseIdealFoundCircleXLD,HomMat2DScale)
affine_trans_contour_xld (FoundCircleXLD,ReverseFoundCircleXLD,HomMat2DScale)

dev_display (OriginalTestImage)
dev_set_draw ('margin')
dev_set_color ('blue')
dev_display (CircleXLD)
dev_set_color ('green')
dev_display (ReverseIdealFoundCircleXLD)
dev_set_color ('red')
dev_display (ReverseFoundCircleXLD)
stop()

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