Aerial/sattelite image Segmentation: Not Modeling Shadows?

Dear all,
With OTB via QGIS, I’m able to generate some interesting segmentations, particularly using the Generic Region Merging tool. The input image is one 20 cms aerial Ortho Infrared Color (green, red, and near infrared bands) or a Spot6/7 multispectral satellite image (1m50 resolution). One of the limitations, however, is the modeling/segmentation of shadows.
I’ve attached a screenshot. Do you have any ideas on how to overcome this problem/skip/not modelize/segments shadows ?
Thanks so much.