<PAGE>

                                                                   EXHIBIT 10.10

                         REGISTRATION RIGHTS AGREEMENT

THIS REGISTRATION RIGHTS AGREEMENT, dated as of the 28th day of July, 2000,
between Euston Investments Holdings Limited ("Holder"), and FOCUS Enhancements,
Inc., a corporation incorporated under the laws of the State of Delaware (the
"Company").

     WHEREAS, simultaneously with the execution and delivery of this
Agreement, pursuant to a Private Equity Line of Credit Agreement dated the date
hereof (the "Purchase Agreement") the Holder has committed to purchase up to
$5,000,000 of the Company's Common Stock (terms not defined herein shall have
the meanings ascribed to them in the Purchase Agreement); and

     WHEREAS, the Company desires to grant to the Holder the registration
rights set forth herein with respect to the Put Shares and the Blackout Shares
issuable upon exercise of the Company's  Put rights from time to time and the
Warrant Shares (hereinafter referred to as the "Put Shares" or "Stock" or
"Securities" of the Company).

     NOW, THEREFORE, the parties hereto mutually agree as follows:

     Section 1.  Registrable Securities.  As used herein the term "Registrable
                 ----------------------
Security" means the Securities until (i) all Put Shares and Warrant Shares have
been disposed of pursuant to the Registration Statement, (ii) all Put Shares and
Warrant Shares have been sold under circumstances under which all of the
applicable conditions of Rule 144 (or any similar provision then in force) under
the Securities Act ("Rule 144") are met, (iii) all Put Shares and Warrant Shares
have been otherwise transferred to persons who may trade such Securities without
restriction under the Securities Act, and the Company has delivered a new
certificate or other evidence of ownership for such Put Shares and Warrant
Shares not bearing a restrictive legend or (iv) such time as, in the opinion of
counsel to the Company, all Put Shares and Warrant Shares may be sold without
any time, volume or manner limitations pursuant to Rule 144(k) (or any similar
provision then in effect) under the Securities Act. The term "Registrable
Securities" means any and/or all of the securities falling within the foregoing
definition of a "Registrable Security."  In the event of any merger,
reorganization, consolidation, recapitalization or other change in corporate
structure affecting the Common Stock, such adjustment shall be deemed to be made
in the definition of "Registrable Security" as is appropriate in order to
prevent any dilution or enlargement of the rights granted pursuant to this
Agreement.

     Section 2. Restrictions on Transfer. The Holder acknowledges and
                ------------------------
understands that in the absence of an effective Registration Statement
authorizing the resale of the Securities as provided herein, the Securities are
"restricted securities" as defined in Rule 144 promulgated under the Act. The
Holder understands that no disposition or transfer of the Securities may be made
by Holder in the absence of (i) an opinion of counsel to the Holder, in form and
substance reasonably satisfactory to the Company, that such transfer may be made
without registration under the Securities Act or (ii) such registration.
<PAGE>

     With a view to making available to the Holder the benefits of Rule 144
under the Securities Act or any other similar rule or regulation of the
Commission that may at any time permit the Holder to sell securities of the
Company to the public without registration ("Rule 144"), the Company agrees to:

             (a) comply with the provisions of paragraph (c)(1) of Rule 144; and

             (b) file with the Commission in a timely manner all reports and
other documents required to be filed by the Company pursuant to Section 13 or
15(d) under the Exchange Act; and, if at any time it is not required to file
such reports but in the past had been required to or did file such reports, it
will, upon the request of any Holder, make available other information as
required by, and so long as necessary to permit sales of, its Registrable
Securities pursuant to Rule 144.

     Section 3.  Registration Rights With Respect to the Securities.
                 --------------------------------------------------

             (a) The Company agrees that it will prepare and file with the
Securities and Exchange Commission ("Commission"), within fifteen (15) days
after the date hereof, a registration statement (on Form S-1, S-3, or other
appropriate form of registration statement) under the Securities Act (the
"Registration Statement"), at the sole expense of the Company (except as
provided in Section 3(c) hereof), so as to permit a public offering and resale
of the Securities under the Act by Holder.

             The Company shall use its best efforts to cause the Registration
Statement to become effective within ninety (90) days from the date hereof, or,
if earlier, within five (5) days of SEC clearance to request acceleration of
effectiveness. If the Registration Statement is not declared effective by
September 30, 2000, this Agreement and the Purchase Agreement shall terminate.
The number of shares designated in the Registration Statement to be registered
shall be such number of shares as the Company reasonably expects to issue
pursuant to this Agreement (including the Warrant Shares and the Blackout
Shares) and shall include appropriate language regarding reliance upon Rule 416
to the extent permitted by the Commission.  The Company will notify Holder of
the effectiveness of the Registration Statement within one Trading Day of such
event.

             (b) The Company will maintain the Registration Statement or post-
effective amendment filed under this Section 3 hereof effective under the
Securities Act until the earlier of (i) the date that none of the Securities are
or may become issued and outstanding, (ii) the date that all of the Securities
have been sold pursuant to the Registration Statement, (iii) the date the
holders thereof receive an opinion of counsel to the Company, which counsel
shall be reasonably acceptable to the Holder, that the Securities may be sold
under the provisions of Rule 144 without limitation as to volume, (iv) all
Securities have been otherwise transferred to persons who may trade such shares
without restriction under the Securities Act, and the Company has delivered a
new certificate or other evidence of ownership for such securities not bearing a
restrictive legend, or (v) all Securities may be sold without any time, volume
or manner limitations pursuant to Rule 144(k) or any similar provision then in
effect under the Securities Act in the opinion of counsel to the Company, which
counsel shall be reasonably acceptable to the Holder (the "Effectiveness
Period").

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<PAGE>

             (c) All fees, disbursements and out-of-pocket expenses and costs
incurred by the Company in connection with the preparation and filing of the
Registration Statement under subparagraph 3(a) and in complying with applicable
securities and Blue Sky laws (including, without limitation, all attorneys' fees
of the Company) shall be borne by the Company. The Holder shall bear the cost of
underwriting and/or brokerage discounts, fees and commissions, if any,
applicable to the Securities being registered and the fees and expenses of its
counsel. The Holder and its counsel shall have a reasonable period, not to
exceed ten (10) Trading Days, to review the proposed Registration Statement or
any amendment thereto, prior to filing with the Commission, and the Company
shall provide each Holder with copies of any comment letters received from the
Commission with respect thereto within two (2) Trading Days of receipt thereof.
The Company shall make reasonably available for inspection by Holder, any
underwriter participating in any disposition pursuant to the Registration
Statement, and any attorney, accountant or other agent retained by such Holder
or any such underwriter all relevant financial and other records, pertinent
corporate documents and properties of the Company and its subsidiaries, and
cause the Company's officers, directors and employees to supply all information
reasonably requested by such Holder or any such underwriter, attorney,
accountant or agent in connection with the Registration Statement, in each case,
as is customary for similar due diligence examinations; provided, however, that
                                                        --------  -------
all records, information and documents that are designated in writing by the
Company, in good faith, as confidential, proprietary or containing any material
non-public information shall be kept confidential by such Holder and any such
underwriter, attorney, accountant or agent (pursuant to an appropriate
confidentiality agreement in the case of any such Holder or agent), unless such
disclosure is made pursuant to judicial process in a court proceeding (after
first giving the Company an opportunity promptly to seek a protective order or
otherwise limit the scope of the information sought to be disclosed) or is
required by law, or such records, information or documents become available to
the public generally or through a third party not in violation of an
accompanying obligation of confidentiality; and provided further that, if the
                                                -------- -------
foregoing inspection and information gathering would otherwise disrupt the
Company's conduct of its business, such inspection and information gathering
shall, to the maximum extent possible, be coordinated on behalf of the Holder
and the other parties entitled thereto by one firm of counsel designed by and on
behalf of the majority in interest of Holder and other parties. The Company
shall qualify any of the securities for sale in such states as such Holder
reasonably designates and shall furnish indemnification in the manner provided
in Section 6 hereof. However, the Company shall not be required to qualify in
any state which will require an escrow or other restriction relating to the
Company and/or the sellers, or which will require the Company to qualify to do
business in such state or require the Company to file therein any general
consent to service of process. The Company at its expense will supply the Holder
with copies of the Registration Statement and the prospectus included therein
and other related documents in such quantities as may be reasonably requested by
the Holder.

             (d) The Company shall not be required by this Section 3 to include
a Holder's Securities in any Registration Statement which is to be filed if, in
the opinion of counsel for both the Holder and the Company (or, should they not
agree, in the opinion of another counsel experienced in securities law matters
acceptable to counsel for the Holder and the Company) the proposed offering or
other transfer as to which such registration is requested is exempt from
applicable federal and state securities laws and would result in all purchasers
or transferees

                                       3
<PAGE>

obtaining securities which are not "restricted securities", as defined in Rule
144 under the Securities Act.

             (e) No provision contained herein shall preclude the Company from
selling securities pursuant to any Registration Statement in which it is
required to include Securities pursuant to this Section 3.

             (f) If at any time or from time to time after the effective date of
the Registration Statement, the Company notifies the Holder in writing of the
existence of a Potential Material Event (as defined in Section 3(g) below), the
Holder shall not offer or sell any Securities or engage in any other transaction
involving or relating to Securities, from the time of the giving of notice with
respect to a Potential Material Event until such Holder receives written notice
from the Company that such Potential Material Event either has been disclosed to
the public or no longer constitutes a Potential Material Event; provided,
                                                                ---------
however, that if the Company so suspends the right to such holders of Securities
--------
for more than thirty (30) days in the aggregate during any twelve month period,
during the periods the Registration Statement is required to be in effect such
excess periods shall be a Registration Default, and shall entitle the Investor
to receive Blackout Shares as provided in the Purchase Agreement. If a Potential
Material Event shall occur prior to the date the Registration Statement is
filed, then the Company's obligation to file the Registration Statement shall be
delayed without penalty for not more than thirty (30) days. The Company must
give Holder notice in writing at least two (2) Trading Days prior to the first
day of the blackout period, if lawful to do so.

             (g) "Potential Material Event" means any of the following: (a) the
possession by the Company of material information that is not ripe for
disclosure in a registration statement, as determined in good faith by the Chief
Executive Officer or the Board of Directors of the Company or that disclosure of
such information in the Registration Statement would be detrimental to the
business and affairs of the Company; or (b) any material engagement or activity
by the Company which would, in the good faith determination of the Chief
Executive Officer or the Board of Directors of the Company, be adversely
affected by disclosure in a registration statement at such time, which
determination shall be accompanied by a good faith determination by the Chief
Executive Officer or the Board of Directors of the Company that the Registration
Statement would be materially misleading absent the inclusion of such
information.

     Section 4. Cooperation with Company. Holder will cooperate with the Company
                ------------------------
in all respects in connection with this Agreement, including timely supplying
all information reasonably requested by the Company (which shall include all
information regarding the Holder and proposed manner of sale of the Registrable
Securities required to be disclosed in the Registration Statement) and executing
and returning all documents reasonably requested in connection with the
registration and sale of the Registrable Securities and entering into and
performing its obligations under any underwriting agreement, if the offering is
an underwritten offering, in usual and customary form, with the managing
underwriter or underwriters of such underwritten offering. The Holder consents
to be named as a statutory underwriter in the Registration Statement.

     Section 5. Registration Procedures. If and whenever the Company is required
                -----------------------
by any of the provisions of this Agreement to effect the registration of any of
the Registrable

                                       4
<PAGE>

Securities under the Act, the Company shall (except as otherwise provided in
this Agreement), as expeditiously as possible, subject to the Holder's
assistance and cooperation as reasonably required:

             (a) (i) prepare and file with the Commission such amendments and
supplements to the Registration Statement and the prospectus used in connection
therewith as may be necessary to keep such registration statement effective and
to comply with the provisions of the Act with respect to the sale or other
disposition of all securities covered by such registration statement whenever
the Holder of such Registrable Securities shall desire to sell or otherwise
dispose of the same (including prospectus supplements with respect to the sales
of securities from time to time in connection with a registration statement
pursuant to Rule 415 promulgated under the Act) and (ii) take all lawful action
such that each of (A) the Registration Statement and any amendment thereto does
not, when it becomes effective, contain an untrue statement of a material fact
or omit to state a material fact required to be stated therein or necessary to
make the statements therein, not misleading and (B) the Prospectus forming part
of the Registration Statement, and any amendment or supplement thereto, does not
at any time during the Registration Period include an untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading.

             (b) (i) prior to the filing with the Commission of any Registration
Statement (including any amendments thereto) and the distribution or delivery of
any prospectus (including any supplements thereto), provide draft copies thereof
to the Holders and reflect in such documents all such comments as the Holders
(and their counsel) reasonably may propose and (ii) furnish to each Holder such
numbers of copies of a prospectus including a preliminary prospectus or any
amendment or supplement to any prospectus, as applicable, in conformity with the
requirements of the Act, and such other documents, as such Holder may reasonably
request in order to facilitate the public sale or other disposition of the
securities owned by such Holder;

             (c) register and qualify the Registrable Securities covered by the
Registration Statement under such other securities or blue sky laws of such
jurisdictions as the Holder shall reasonably request (subject to the limitations
set forth in Section 3(d) above), and do any and all other acts and things which
may be necessary or advisable to enable each Holder to consummate the public
sale or other disposition in such jurisdiction of the securities owned by such
Holder, except that the Company shall not for any such purpose be required to
qualify to do business as a foreign corporation in any jurisdiction wherein it
is not so qualified or to file therein any general consent to service of
process;

             (d) list such Registrable Securities on the Primary Market, and any
other exchange on which the Common Stock of the Company is then listed, if the
listing of such Registrable Securities is then permitted under the rules of such
exchange or Nasdaq;

             (e) notify each Holder at any time when a prospectus relating
thereto covered by the Registration Statement is required to be delivered under
the Act, of the happening of any event of which it has knowledge as a result of
which the prospectus included in the Registration Statement, as then in effect,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not

                                       5
<PAGE>

misleading in the light of the circumstances then existing, and the Company
shall prepare and file a curative amendment under Section 5(a) as quickly as
commercially possible;

             (f) as promptly as practicable after becoming aware of such event,
notify Holder (or, in the event of an underwritten offering, the managing
underwriters) of the issuance by the Commission or any state authority of any
stop order or other suspension of the effectiveness of the Registration
Statement at the earliest possible time and take all lawful action to effect the
withdrawal, recession or removal of such stop order or other suspension;

             (g) cooperate with the Holder to facilitate the timely preparation
and delivery of certificates for the Registrable Securities to be offered
pursuant to the Registration Statement and enable such certificates for the
Registrable Securities to be in such denominations or amounts, as the case may
be, as the Holder reasonably may request and registered in such names as the
Holder may request; and, within three Trading Days after a Registration
Statement which includes Registrable Securities is declared effective by the
Commission, deliver and cause legal counsel selected by the Company to deliver
to the transfer agent for the Registrable Securities (with copies to the Holder)
an appropriate instruction and, to the extent necessary, an opinion of such
counsel;

             (h) take all such other lawful actions reasonably necessary to
expedite and facilitate the disposition by the Holder of its Registrable
Securities in accordance with the intended methods therefor provided in the
prospectus which are customary for issuers to perform under the circumstances;

             (i) in the event of an underwritten offering, promptly include or
incorporate in a Prospectus supplement or post-effective amendment to the
Registration Statement such information as the managers reasonably agree should
be included therein and to which the Company does not reasonably object and make
all required filings of such Prospectus supplement or post-effective amendment
as soon as practicable after it is notified of the matters to be included or
incorporated in such Prospectus supplement or post-effective amendment; and

             (j)  maintain a transfer agent and registrar for its Common Stock.

     Section 6.  Indemnification.
                 ---------------

             (a) The Company agrees to indemnify and hold harmless the Holder
and each person, if any, who controls the Holder within the meaning of the
Securities Act ("Distributing Holder") against any losses, claims, damages or
liabilities, joint or several (which shall, for all purposes of this Agreement,
include, but not be limited to, all reasonable costs of defense and
investigation and all reasonable attorneys' fees), to which the Distributing
Holder may become subject, under the Securities Act or otherwise, insofar as
such losses, claims, damages or liabilities (or actions in respect thereof)
arise out of or are based upon any untrue statement or alleged untrue statement
of any material fact contained in the Registration Statement, or any related
preliminary prospectus, final prospectus or amendment or supplement thereto, or
arise out of or are based upon the omission or alleged omission to state therein
a material fact required to be stated therein or necessary to make the
statements therein not misleading; provided, however, that the Company will not
be liable in any such case to the extent that any such loss, claim,

                                       6
<PAGE>

damage or liability arises out of or is based upon an untrue statement or
alleged untrue statement or omission or alleged omission made in the
Registration Statement, preliminary prospectus, final prospectus or amendment or
supplement thereto in reliance upon, and in conformity with, written information
furnished to the Company by the Distributing Holder, specifically for use in the
preparation thereof. This Section 6(a) shall not inure to the benefit of any
Distributing Holder with respect to any person asserting such loss, claim,
damage or liability who purchased the Registrable Securities which are the
subject thereof if the Distributing Holder failed to send or give (in violation
of the Securities Act or the rules and regulations promulgated thereunder) a
copy of the prospectus contained in such Registration Statement to such person
at or prior to the written confirmation to such person of the sale of such
Registrable Securities, where the Distributing Holder was obligated to do so
under the Securities Act or the rules and regulations promulgated thereunder.
This indemnity agreement will be in addition to any liability which the Company
may otherwise have.

             (b) Each Distributing Holder agrees that it will indemnify and hold
harmless the Company, and each officer, director of the Company or person, if
any, who controls the Company within the meaning of the Securities Act, against
any losses, claims, damages or liabilities (which shall, for all purposes of
this Agreement, include, but not be limited to, all reasonable costs of defense
and investigation and all reasonable attorneys' fees) to which the Company or
any such officer, director or controlling person may become subject under the
Securities Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact contained in
the Registration Statement, or any related preliminary prospectus, final
prospectus or amendment or supplement thereto, or arise out of or are based upon
the omission or the alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
but in each case only to the extent that such untrue statement or alleged untrue
statement or omission or alleged omission was made in the Registration
Statement, preliminary prospectus, final prospectus or amendment or supplement
thereto in reliance upon, and in conformity with, written information furnished
to the Company by such Distributing Holder, specifically for use in the
preparation thereof. This indemnity agreement will be in addition to any
liability which the Distributing Holder may otherwise have. Notwithstanding
anything to the contrary herein, the Distributing Investor shall not be liable
under this Section 6(b) for any amount in excess of the net proceeds to such
Distributing Investor as a result of the sale of Registrable Securities pursuant
to the Registration Statement.

             (c) Promptly after receipt by an indemnified party under this
Section 6 of notice of the commencement of any action, such indemnified party
will, if a claim in respect thereof is to be made against the indemnifying party
under this Section 6, notify the indemnifying party of the commencement thereof;
but the omission so to notify the indemnifying party will not relieve the
indemnifying party from any liability which it may have to any indemnified party
except to the extent of actual prejudice demonstrated by the indemnifying party.
In case any such action is brought against any indemnified party, and it
notifies the indemnifying party of the commencement thereof, the indemnifying
party will be entitled to participate in, and, to the extent that it may wish,
jointly with any other indemnifying party similarly notified, assume the defense
thereof, subject to the provisions herein stated and after notice from the
indemnifying party to such indemnified party of its election so to assume the

                                       7
<PAGE>

defense thereof, the indemnifying party will not be liable to such indemnified
party under this Section 6 for any legal or other expenses subsequently incurred
by such indemnified party in connection with the defense thereof other than
reasonable costs of investigation, unless the indemnifying party shall not
pursue the action to its final conclusion. The indemnified party shall have the
right to employ separate counsel in any such action and to participate in the
defense thereof, but the fees and expenses of such counsel shall not be at the
expense of the indemnifying party if the indemnifying party has assumed the
defense of the action with counsel reasonably satisfactory to the indemnified
party; provided that if the indemnified party is the Distributing Holder, the
fees and expenses of such counsel shall be at the expense of the indemnifying
party if (i) the employment of such counsel has been specifically authorized in
writing by the indemnifying party, or (ii) the named parties to any such action
(including any impleaded parties) include both the Distributing Holder and the
indemnifying party and the Distributing Holder shall have been advised by such
counsel that there may be one or more legal defenses available to the
indemnifying party different from or in conflict with any legal defenses which
may be available to the Distributing Holder (in which case the indemnifying
party shall not have the right to assume the defense of such action on behalf of
the Distributing Holder, it being understood, however, that the indemnifying
party shall, in connection with any one such action or separate but
substantially similar or related actions in the same jurisdiction arising out of
the same general allegations or circumstances, be liable only for the reasonable
fees and expenses of one separate firm of attorneys for the Distributing Holder,
which firm shall be designated in writing by the Distributing Holder). No
settlement of any action against an indemnified party shall be made without the
prior written consent of the indemnified party, which consent shall not be
unreasonably withheld.

     All fees and expenses of the indemnified party (including reasonable costs
of defense and investigation in a manner not inconsistent with this Section and
all reasonable attorneys' fees and expenses) shall be paid to the indemnified
party, as incurred, within ten (10) Trading Days of written notice thereof to
the indemnifying party (regardless of whether it is ultimately determined that
an indemnified party is not entitled to indemnification hereunder; provided,
that the indemnifying party may require such indemnified party to undertake to
reimburse all such fees and expenses to the extent it is finally judicially
determined that such indemnified party is not entitled to indemnification
hereunder).

     Section 7.  Contribution.  In order to provide for just and equitable
                 ------------
contribution under the Securities Act in any case in which (i) the indemnified
party makes a claim for indemnification pursuant to Section 6 hereof but is
judicially determined (by the entry of a final judgment or decree by a court of
competent jurisdiction and the expiration of time to appeal or the denial of the
last right of appeal) that such indemnification may not be enforced in such case
notwithstanding the fact that the express provisions of Section 6 hereof provide
for indemnification in such case, or (ii) contribution under the Securities Act
may be required on the part of any indemnified party, then the Company and the
applicable Distributing Holder shall contribute to the aggregate losses, claims,
damages or liabilities to which they may be subject (which shall, for all
purposes of this Agreement, include, but not be limited to, all reasonable costs
of defense and investigation and all reasonable attorneys' fees), in either such
case (after contribution from others) on the basis of relative fault as well as
any other relevant equitable considerations.  The relative fault shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged

                                       8
<PAGE>

omission to state a material fact relates to information supplied by the Company
on the one hand or the applicable Distributing Holder on the other hand, and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such statement or omission. The Company and the Distributing
Holder agree that it would not be just and equitable if contribution pursuant to
this Section 7 were determined by pro rata allocation or by any other method of
allocation which does not take account of the equitable considerations referred
to in this Section 7. The amount paid or payable by an indemnified party as a
result of the losses, claims, damages or liabilities (or actions in respect
thereof) referred to above in this Section 7 shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any such action or claim. No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Securities Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation.

Notwithstanding any other provision of this Section 7, in no event shall any (i)
Holder be required to undertake liability to any person under this Section 7 for
any amounts in excess of the dollar amount of the net proceeds to be received by
such Holder from the sale of such Holder's Registrable Securities (after
deducting any fees, discounts and commissions applicable thereto) pursuant to
any Registration Statement under which such Registrable Securities are to be
registered under the Securities Act and (ii) underwriter be required to
undertake liability to any person hereunder for any amounts in excess of the
aggregate discount, commission or other compensation payable to such underwriter
with respect to the Registrable Securities underwritten by it and distributed
pursuant to the Registration Statement.

     Section 8. Notices. All notices, demands, requests, consents, approvals,
                -------
and other communications required or permitted hereunder shall be in writing
and, unless otherwise specified herein, shall be (i) personally served, (ii)
deposited in the mail, registered or certified, return receipt requested,
postage prepaid, (iii) delivered by reputable air courier service with charges
prepaid, or (iv) transmitted by hand delivery, telegram, or facsimile, addressed
as set forth below or to such other address as such party shall have specified
most recently by written notice. Any notice or other communication required or
permitted to be given hereunder shall be deemed effective (a) upon hand delivery
or delivery by facsimile, with accurate confirmation generated by the
transmitting facsimile machine, at the address or number designated below (if
delivered on a business day during normal business hours where such notice is to
be received), or the first business day following such delivery (if delivered
other than on a business day during normal business hours where such notice is
to be received) or (b) on the second business day following the date of mailing
by reputable courier service, fully prepaid, addressed to such address, or upon
actual receipt of such mailing, whichever shall first occur. The addresses for
such communications shall be:

     If to the Company:
                                    FOCUS Enhancements, Inc.
                                    600 Research Drive
                                    Wilmington, MA 01887
                                    Attention: Christopher Ricci
                                    Telephone: (978) 988-5888
                                    Fax:  (978) 661-0160

                                       9
<PAGE>

     If to the Investor:            Euston Investments Holdings Limited
                                    c/o Dr. Batliner & Partners
                                    Aeulestrasse 74
                                    FI-9490, Vaduz, Liechtenstein
                                    Telephone: 011-
                                    Fax: 011-

     with a copy to:                Epstein Becker & Green, P.C.
     (shall not constitute notice)  250 Park Avenue.
                                    New York, New York  10177
                                    Attention Joseph A. Smith, Esq.
                                    Telephone: (212) 351-4500
                                    Fax: (212) 661-0989

Either party hereto may from time to time change its address or facsimile number
for notices under this Section 8 by giving at least ten (10) days' prior written
notice of such changed address or facsimile number to the other party hereto.

     Section 9. Assignment. Neither this Agreement nor any rights of the Holder
                ----------
or the Company hereunder may be assigned by either party to any other person.
Notwithstanding the foregoing, (a) the provisions of this Agreement shall inure
to the benefit of, and be enforceable by, any transferee of any of the Common
Stock purchased by the Investor pursuant to the Purchase Agreement, and (b) upon
the prior written consent of the Company, which consent shall not be
unreasonably withheld or delayed in the case of an assignment to an affiliate of
the Holder, the Holder's interest in this Agreement may be assigned at any time,
in whole or in part, to any other person or entity (including any affiliate of
the Holder) who agrees to be bound hereby.

     Section 10. Additional Covenants of the Company. The Company agrees that at
                 -----------------------------------
such time as it meets all the requirements for the use of Securities Act
Registration Statement on Form S-3 it shall file all reports and information
required to be filed by it with the Commission in a timely manner and take all
such other action so as to maintain such eligibility for the use of such form.

     Section 11. Counterparts/Facsimile. This Agreement may be executed in two
                 ----------------------
or more counterparts, each of which shall constitute an original, but all of
which, when together shall constitute but one and the same instrument, and shall
become effective when one or more counterparts have been signed by each party
hereto and delivered to the other party. In lieu of the original, a facsimile
transmission or copy of the original shall be as effective and enforceable as
the original.

     Section 12. Remedies. The remedies provided in this Agreement are
                 --------
cumulative and not exclusive of any remedies provided by law. If any term,
provision, covenant or

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<PAGE>

restriction of this Agreement is held by a court of competent jurisdiction to be
invalid, illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their best efforts to find and employ an alternative means to
achieve the same or substantially the same result as that contemplated by such
term, provision, covenant or restriction. It is hereby stipulated and declared
to be the intention of the parties that they would have executed the remaining
terms, provisions, covenants and restrictions without including any of such that
may be hereafter declared invalid, illegal, void or unenforceable.

     Section 13. Conflicting Agreements. The Company shall not enter into any
                 ----------------------
agreement with respect to its securities that is inconsistent with the rights
granted to the holders of Registrable Securities in this Agreement or otherwise
prevents the Company from complying with all of its obligations hereunder.

     Section 14. Headings. The headings in this Agreement are for reference
                 --------
purposes only and shall not affect in any way the meaning or interpretation of
this Agreement.

     Section 15. Governing Law, Arbitration. This Agreement shall be governed by
                 --------------------------
and construed in accordance with the laws of the State of New York applicable to
contracts made in New York by persons domiciled in New York City and without
regard to its principles of conflicts of laws. Any dispute under this Agreement
shall be submitted to arbitration under the American Arbitration Association
(the "AAA") in New York City, New York, and shall be finally and conclusively
determined by the decision of a board of arbitration consisting of three (3)
members (hereinafter referred to as the "Board of Arbitration") selected as
according to the rules governing the AAA. The Board of Arbitration shall meet on
consecutive business days in New York City, New York, and shall reach and render
a decision in writing (concurred in by a majority of the members of the Board of
Arbitration) with respect to the amount, if any, which the losing party is
required to pay to the other party in respect of a claim filed. In connection
with rendering its decisions, the Board of Arbitration shall adopt and follow
the laws of the State of New York. To the extent practical, decisions of the
Board of Arbitration shall be rendered no more than thirty (30) calendar days
following commencement of proceedings with respect thereto. The Board of
Arbitration shall cause its written decision to be delivered to all parties
involved in the dispute. The Board of Arbitration shall be authorized and is
directed to enter a default judgment against any party refusing to participate
in the arbitration proceeding with thirty days of any deadline for such
participation. Any decision made by the Board of Arbitration (either prior to or
after the expiration of such thirty (30) calendar day period) shall be final,
binding and conclusive on the parties to the dispute, and entitled to be
enforced to the fullest extent permitted by law and entered in any court of
competent jurisdiction. The prevailing party shall be awarded its costs,
including attorneys' fees, from the non-prevailing party as part of the
arbitration award. Any party shall have the right to seek injunctive relief from
any court of competent jurisdiction in any case where such relief is available.
The prevailing party in such injunctive action shall be awarded its costs,
including attorney's fees, from the non-prevailing party.

     Section 16. Severability.  If any provision of this Agreement shall for any
                 ------------
reason be held invalid or unenforceable, such invalidity or unenforceablity
shall not affect any other provision hereof and this Agreement shall be
construed as if such invalid or unenforceable provision had never been contained
herein. Terms not otherwise defined herein shall be defined in accordance with
the Agreement.

                                       11
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Registration
Rights Agreement to be duly executed, on this     day of July, 2000.
                                              ---

                              FOCUS ENHANCEMENTS, INC.


                              By:
                                 -------------------------------------
                                 Brett A. Moyer,
                                 Executive Vice President  &
                                 Chief Operating Officer


                              EUSTON INVESTMENTS HOLDINGS LIMITED


                              By:
                                 -------------------------------------
                                 Han Gassner, Director

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