Odoo8 support some default barcode image creation using below syntax, 

<img t-att-src="'/report/barcode/?type=%s&amp;value=%s&amp;width=%s&amp;height=%s&amp;humanreadable=%s' % (EAN13, 5412569874501, 200, 80,1)"/>

but when I passing UPCE as barcode type and 8 digits number it will not show any output. Any suggestions about UPC-E barcode image generation will be strongly appreciated.