function getMediaBaseUrl() {

$om = MagentoFrameworkAppObjectManager::getInstance();

$storeManager = $om->get('MagentoStoreModelStoreManagerInterface');

$currentStore = $storeManager->getStore();
return $currentStore->getBaseUrl(MagentoFrameworkUrlInterface::URL_TYPE_MEDIA);
}

echo $this->getMediaBaseUrl() .'catalog/product'. $_product->getImage();