human body segmentation

[zhly0]

This is not a issue,but a question,sorry to put it here. I want to do human body segmentation on Android phones using the frontal camera,the picture from camera,its width/height is 9/16=0.5625,does the input image's width/height ratio influence the segmentation results?Or should I resize the image to width/height =1.0?And how much training image is need to get a good segmentation result?I am new to image segmentation,and now I can get only about 1k images,Thank you very much if you can help me!