SULLIVAN & WORCESTER LLP
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       (202) 775-8190                                       (212) 486-8200
    FAX NO. 202-293-2275                                 FAX NO. 212-758-2151




                                                              April 2, 1998





FOCUS Enhancements, Inc.
142 North Road
Sudbury, Massachusetts 01776

Gentlemen:

         We are familiar with the  Registration  Statement on Form S-3 (the "S-3
Registration  Statement")  to which this  opinion is an exhibit,  to be filed by
FOCUS  Enhancements,  Inc., a Delaware  corporation  (the  "Company"),  with the
Securities and Exchange Commission under the Securities Act of 1933, as amended.
The S-3  Registration  Statement  relates to the  proposed  public  offering  by
certain  securityholders  of the  Company of a total of  1,441,224  shares  (the
"Shares")  of the  Company's  Common  Stock,  $.01 par value per share  ("Common
Stock"), consisting of: (i) 1,092,150 shares issued to JNC Opportunity Fund Ltd.
(the  "Investor")  in  connection  with a private  placement  in March 1998 (the
"March 98  Offering");  (iii) 327,645  shares  issuable to the Investor upon the
exercise of warrants (the "Investor Warrants") issued to the Investor;  and (iv)
21,429  shares  issuable  upon the exercise of warrants  issued to the placement
agent and its designee (the "Broker  Warrants"  and,  together with the Investor
Warrants, the "Warrants") in connection with the March 98 Offering.

         We have  acted  as  counsel  to the  Company  in  connection  with  the
preparation of the S-3 Registration  Statement,  and we have examined and relied
on  the  originals  or  copies,   certified  or  otherwise   identified  to  our
satisfaction  of all such  corporate  records  of the  Company  and  such  other
instruments   and  other   certificates  of  public   officials,   officers  and
representatives  of the  Company and such other  persons,  and we have made such
investigations of law, as we have deemed  appropriate as a basis for the opinion
expressed below. In making such examination,  we have assumed the genuineness of
all signatures,  the legal capacity of natural persons,  the authenticity of all
documents submitted to us as originals and the conformity to the originals of





FOCUS Enhancements, Inc.
April 2, 1998
Page 2


all documents  submitted to us as copies,  which facts we have not independently
verified. As to various facts material to the opinions set forth herein, we have
relied without  independent  verification  upon certificates of public officials
and upon facts certified to us by officers of the Company. We express no opinion
herein as to any laws other  than the  General  Corporation  Law of the State of
Delaware.

         Based upon the  foregoing,  we are of the opinion  that the Company has
corporate  power adequate for the issuance of the Shares  issuable in the manner
set forth in the S-3  Registration  Statement  and  offered  pursuant to the S-3
Registration  Statement.  The Shares issuable upon the exercise of the Warrants,
assuming  conversion or exercise on the date hereof (the "Relevant Shares") have
been duly  authorized  and  reserved  for  issuance.  Upon the  exercise  of the
Warrants into Shares and delivery of such Shares in accordance with the terms of
the Warrants,  the Relevant Shares so issued will be validly issued,  fully paid
and non-assessable.

         We hereby  consent to the  filing of this  opinion as an exhibit to the
S-3 Registration Statement.

                                              Very truly yours,


                                              /s/  SULLIVAN & WORCESTER LLP
                                              SULLIVAN & WORCESTER LLP