Basic requirement for color histogram & pattern matching.

I will do a student project about video & image(stored in PC) analysis using color histogram & pattern matching. I have LabVIEW6i only. What's the basic requirement for this analysis? vision module? Please suggest a simple and cheap requirement. Thanks all.

It really depends what is the purpose of your student project. Is it about developing those routines yourself or is it about using ready made routines to research the possibilities and differences on different kind of pictures.
In the first case you already have everything necessary as you can perfectly well develop those routines in normal LabVIEW. Otherwise you would want to look into the IMAQ Vision Toolkit from National Instruments or the IVision Toolkit from Hytek Automation http://www.hytekautomation.com/Products/IVision.html. You can download the IVision Toolkit free for evaluation it just will regularly show a nag screen to remember you that this is not a licensed version.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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When a MATCH_RECOGNIZE PATTERN match occurs, is there any way to retain the underlying event for the next pattern match?
It's like I want to replay the underlying event (that triggered the match) into the next "batch" of events.

Here is an approach
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<view id="S">
        <![CDATA[
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                       obs,
                       epoch,
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                FROM
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                ON
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        ]]>
      </view>
      <view id="v1">
        <![CDATA[
                  SELECT
                          T.id,
                          T.obsTotal,
                          T.elapsedTime,
                          T.firstts,
                          T.lastts
                  FROM S MATCH_RECOGNIZE (
                          PARTITION BY id
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                                    id as id,
                                    sum(obs) as obsTotal,
                                    B.epoch - decode(B.lastMatchedTime, 0L, min(epoch), B.lastMatchedTime) as elapsedTime,
                                    decode(B.lastMatchedTime, 0L, min(epoch), B.lastMatchedTime) as firstts,
                                    B.epoch as lastts
                          PATTERN ( A+? B )
                          DEFINE
                                   B AS (epoch- decode(lastMatchedTime, 0L, min(epoch), lastMatchedTime)) > 20*60*1000
                  ) as T
        ]]>
      </view>
      <query id="qcache">
         <![CDATA[
             SELECT
                   "key" as keyValue,
                   lastts as lastMatchedTime
             FROM
                   v1
         ]]>
      </query>
       <query id="q1">
         <![CDATA[
             SELECT
             FROM
                    v1
         ]]>
      </query>
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<channel>
       <name>CacheChannel</name>
       <selector>qcache</selector>
   </channel>
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            <wlevs:class>com.bea.wlevs.event.example.helloworld.CacheEvent</wlevs:class>
        </wlevs:event-type>
        <wlevs:event-type type-name="InputEvent">
           <wlevs:properties>
              <wlevs:property name="id" type="int"/>
              <wlevs:property name="obs" type="int"/>
              <wlevs:property name="epoch" type="bigint"/>
           </wlevs:properties>
        </wlevs:event-type>
        <wlevs:event-type type-name="OutputEvent">
           <wlevs:properties>
              <wlevs:property name="id" type="int"/>
              <wlevs:property name="obsTotal" type="int"/>
              <wlevs:property name="elapsedTime" type="bigint"/>
              <wlevs:property name="firstts" type="bigint"/>
              <wlevs:property name="lastts" type="bigint"/>
           </wlevs:properties>
        </wlevs:event-type>
    </wlevs:event-type-repository>
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         <wlevs:instance-property name="port" value="9061" />
         <wlevs:instance-property name="eventTypeName" value="InputEvent" />
         <wlevs:instance-property name="eventPropertyNames" value="id,obs,epoch" />
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    <wlevs:channel id="InputChannel" event-type="InputEvent" >
        <wlevs:listener ref="helloworldProcessor"/>
        <wlevs:source ref="InputAdapter"/>
    </wlevs:channel>
    <wlevs:caching-system id="local-caching"/>
    <wlevs:cache id="lastMatchCache" name="lastMatchCache" key-properties="keyValue" value-type="CacheEvent">
       <wlevs:caching-system ref="local-caching"/>
    </wlevs:cache>
    
    <wlevs:processor id="helloworldProcessor">
       <wlevs:listener ref="CacheChannel"/>
       <wlevs:cache-source ref="lastMatchCache" />
    </wlevs:processor>
    <wlevs:channel id="CacheChannel" event-type="CacheEvent">
       <wlevs:listener ref="lastMatchCache"/>
    </wlevs:channel>
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        <wlevs:listener>
            <bean class="com.bea.wlevs.example.helloworld.HelloWorldBean"/>
        </wlevs:listener>
        <wlevs:source ref="helloworldProcessor"/>
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eventType=OutputEvent object=q1 v1.id=4143, v1.obsTotal=9, v1.elapsedTime=7228000, v1.firstts=1199311210000, v1.lastts=1199318438000
eventType=OutputEvent object=q1 v1.id=4143, v1.obsTotal=17, v1.elapsedTime=30935000, v1.firstts=1199318438000, v1.lastts=1199349373000
eventType=OutputEvent object=q1 v1.id=4143, v1.obsTotal=7, v1.elapsedTime=41436000, v1.firstts=1199349373000, v1.lastts=1199390809000
eventType=OutputEvent object=q1 v1.id=4143, v1.obsTotal=13, v1.elapsedTime=5904000, v1.firstts=1199390809000, v1.lastts=1199396713000Edited by: Anand Srinivasan on Sep 30, 2010 12:49 AM
Edited by: Anand Srinivasan on Sep 30, 2010 12:50 AM

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LTA / MDA / CEA / CHA
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Currently we are doing projects on real time object tracking where we found one doubt that irrespective of the object size whether this color pattern match works or not . My questions are as follows:
1. Whether it is applicable for objects moving far . Because as it moves far, the size of the object decreases such that the color pattern matching is not working what will be solution since we must use color image
2. What is the difference in using scale and rotate invarient in color pattern matching
3. How we can effectively decrease the ROI depending upon the object position as per below attached screen shots .
we have removed boundary box values of X and Y coordinates at the four corner but we can't track as the object moves far away or we can't decrease the ROI as the object moves far.
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Attachments:
problem in matching while object moves far.png ‏515 KB

Hello,
I have not been using the color pattern matching a lot (especially not in real-time). But since the pattern matching considers only small scale changes, you could try updating the color template every n-th iteration (depending on your setup and requirements). The major problem is the template size, since the color pattern matching tends to take quite a lot of time in learning the template. You would of course need to come up with some idea on how to change the subimage size, where the new template will be learned.
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3. Before the detection fails -> rough object detection with some padded bounding rectangle (new ROI),
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You should set up the appropriate illumination first. The resolution is also important, since your object is moved back and forth (but the resolution will have a direct impact on the template learning time).
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K
https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."

Error 1074395241: The template descriptor does not contain data required for rotation-invariant matching.

Hello all,
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But in this case, when I run it, it shows the error that I have indicated in the subject line.
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Thanks in advance.
Solved!
Go to Solution.

-Please go through pattern matching example which comes along with labview fiirst
Go to labview Help>>Find Examples and you can search for example.
-You have create template with angle range and what type of pattern matching you want use.
-For this you have to use IMAQ Learn Pattern before using IMAQ Match Pattern 4
Refer :http://zone.ni.com/reference/en-XX/help/370281U-01/imaqvision/imaq_match_pattern_4/
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

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In the following we proceed to function block search pattern extracted in the previous process (the parameters as rotation angle and minimum score is inserted into SETTINGS control), extract the output of the search function to get the position values indicators that will be displayed on the front panel)
Atom
Certified LabVIEW Associate Developer

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