halcon提取单一颜色，根据实际情况，用不同灰度图相减。
重点内容
decompose3 (Image,R, G, B)
gen_rectangle1 (ROI_1, Row2-100, Column2-100, Row2+100, Column2+400)
reduce_domain (R, ROI_1, ImageReduced1)
reduce_domain (G, ROI_1, ImageReduced2)
reduce_domain (B, ROI_1, ImageReduced3)
sub_image (ImageReduced1, ImageReduced2, ImageSub, 1, 128) *提取出红色区域
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