[SalesForce] How to know the total how many views of knowledge article by each User

You can expose the image through a site. You only need to change the instance url by the site home page.

Also, you need to establish the article as public.

Site Profile Changes:

• Set field where image is placed as visible.

• Set Read permission to object where image is placed.

• Go to "Category Group Visibility Settings" section and set visibility to "All Categories" in the article/s group/s.

For example:

If you have this site:

https://mysite-developer-edition.cs20.force.com/home

And your original image url is:

https://c.cs20.content.force.com/servlet/rtaImage?eid=ka3m0000000XXXX&feoid=00Nm0000000XXXX&refid=0EMm0000000XXXX

Your public image would be:

https://mysite-developer-edition.cs20.force.com/home/servlet/rtaImage?eid=ka3m0000000XXXX&feoid=00Nm0000000XXXX&refid=0EMm0000000XXXX

This workarround would work with any image in a Rich Text Area.

Problem

First of all, I don't think you need to use "Account" object or any other standard object for this requirement. You should go for the custom object, which in your case is, "Page_Views__c". And it should have at least these two fields:

1. LastViewedBy (lookup to User)
2. Count (Numeric, displaying the number of times this user has visited this page)

Logic

When a user is navigating to this VF page, you should check two things:

1. If user record is not present in the pageview object, then INSERT record with user-lookup and count (1).
2. If user record is present, then UPDATE with Count = +1

VF Page

<apex:page standardController="Page_Views__c" action="{!TotalRecordUpdate}" extensions="Displaypage" >
   <apex:form id="PageCount">
      <apex:actionFunction name="updateCount" action="{!updateCount}" reRender="PageCount" />
      Current user: {! $User.UserName } <br/>
      Page Count: {!ViewCount}
   </apex:form>
</apex:page>

Controller

public class DisplayPage {   
   public Decimal ViewCount {get; set;}

    public DisplayPage(ApexPages.StandardController Controller) {
        this.ViewCount = 0;
        //TotalRecordUpdate();  // no need to call dml or dml function in constructor
    }

    public void TotalRecordUpdate(){
        Id userid = UserInfo.getUserId();
        List<Page_View__c> pageViews = [SELECT Last_Viewed_By__c, Page_view_count__c FROM Page_View__c WHERE  Last_Viewed_By__c = : userid ];
   // system.debug(AddsName_c__c);
   if (pageViews.size() > 0 ){
       // record present, use Update
       ViewCount = pageViews[0].Page_view_Count__c +1;
       pageViews[0].Page_view_count__c = ViewCount;
       Update pageViews[0];
   }
        else{
            // record not present, Insert
            Page_View__c pv = new Page_View__c();
            pv.LastViewedBy = userid;
            ViewCount = 1;
            pv.Count__c = ViewCount;

            Insert pv;
            ViewCount = 1;
        }

    }
}

P.S. I have not tested the code above, just on-the-fly, so test it please.