In my project I am using the following syntax in my app.component.html:
<img src="/assets/img/1.jpg" alt="image">
or
<img src="http://mruanova.com/img/1.jpg" alt="image">
use [src] as a template expression when you are binding a property using interpolation:
<img [src]="imagePath" />
is the same as:
<img src={{imagePath}} />