tif格式real类型图片与16位PNG图片的转化（编码/解码）

将real类型图片编码成PNG的图片：

其原理在于以一定的编码方式，将real类型的实际高度信息转为16位的PNG图，同时，在最后一行将图片的编码方式存储下来，解码时先将编码方式读取，再将PNG格式深度图转为real类型的图片。

dev_clear_window ()
dev_open_window (0, 0, 545, 400, 'black', WindowHandle)

*定义编码格式
X_SCALE:=1
X_OFFSET:=0
Y_SCALE:=1
Y_OFFSET:=0
Z_SCALE:=3000
Z_OFFSET:=[]
read_image (Image, '/12-03-15-34-58-155.tif')
get_image_size (Image, Width, Height)
*获取图像上最低点和最高点
threshold (Image, Region, -999999, 999999)
min_max_gray (Region, Image, 0, Z_MIN, Z_MAX, Range)
Z_OFFSET:=Z_MIN*Z_SCALE
*将图像转为16位图像
gen_image_const (Image1, 'real', Width, Height)
gen_image_proto (Image1, ImageCleared, Z_MIN)
sub_image (Image, ImageCleared, ImageSub, Z_SCALE, 0)
convert_image_type (ImageSub, Image2, 'uint2')
*将两张图象融合
gen_image_const (Image3, 'uint2', Width, Height+1)
gen_rectangle1(Rectangle, 0, 0, Height-1, Width-1)
get_region_points (Rectangle, Rows, Columns)
get_grayval_interpolated (Image2, Rows, Columns, 'bilinear', Grayval)

*存储编码方式
set_grayval (Image3, Rows, Columns, Grayval)
set_grayval (Image3, 1600, 0, X_OFFSET)
set_grayval (Image3, 1600, 3, X_SCALE)
set_grayval (Image3, 1600, 7, Y_OFFSET)
set_grayval (Image3, 1600, 11, Y_SCALE)
set_grayval (Image3, 1600, 15, Z_OFFSET)
set_grayval (Image3, 1600, 19, Z_SCALE)
write_image (Image3, 'png', 0, 'E:/Halcon程度代码/test.png')

PNG转real类型：

dev_clear_window ()
dev_open_window (0, 0, 545, 400, 'black', WindowHandle)
read_image (Test, 'E:/Halcon程度代码/test.png')
get_image_size (Test, Width, Height)
X_OFFSET:=[]
X_SCALE:=[]
Y_OFFSET:=[]
Y_SCALE:=[]
Z_OFFSET:=[]
Z_SCALE:=[]

*读取编码信息
get_grayval (Test, Height-1, 0, X_OFFSET)
get_grayval (Test, Height-1, 3, X_SCALE)
get_grayval (Test, Height-1, 7, Y_OFFSET)
get_grayval (Test, Height-1, 11, Y_SCALE)
get_grayval (Test, Height-1, 15, Z_OFFSET)
get_grayval (Test, Height-1, 19, Z_SCALE)
Z_MIN:=1.0*Z_OFFSET/Z_SCALE
crop_part (Test, ImagePart, 0, 0, Width, Height-1)
get_image_size (ImagePart, Width1, Height1)
gen_rectangle1 (Rectangle, 0, 0, Height1-1, Width1-1)
get_region_points (Rectangle, Rows, Columns)
get_grayval_interpolated (ImagePart, Rows, Columns, 'bilinear', Grayval)
Grayval1:=Grayval/Z_SCALE+Z_MIN
gen_image_const (Image, 'real', Width1, Height1)
set_grayval (Image, Rows, Columns, Grayval1)