Distortion Correction with Lookup Table

Hello,
I am trying to run an image through lookup tables in order to correct some distortion.
I have two 2D lookup tables "LUTsXnew.raw" and "LUTsYnew.raw" which locate the new (x,y) coordinates that i want to move the pixel intensities from original image "writing_final_D.raw" into the corrected image.
However, Labview takes too much time (12 seconds), if you have some experience with arrays and images can you please have a look at my code and tell me what i am doing wrong?
I am running the same algorithm in C on the same pc and it takes less than 1second.
Thanks,
CK
PS: I am attaching the VI plus the required raw images
Please ignore the resulting image, i just care about speed for the moment
Attachments:
images1.zip ‏287 KB
distortion correction_set pixel1.vi ‏81 KB

CK,
I cannot run your VI because Vision is not supported on my platform. So my comments are general rather than specific.
1. Your while loops can be replaced with for loops because you know the number of iterations in advance.
2. If you transpose the arrays before entering the loops, you can use autoindexing rather than using Index array in the inner loop.
3. If you only update the inner and outer iteration count indicators every 100 iterations you will not have displays that are meaningless to the user using up processor time. Eliminate them completely for the fastest performance.
4. Avoid coercion inside the loops. The IMAQ Set Pixel Value function has coercion dots on three inputs. Doing explicit conversions outside the loops may be faster.
5. The Tick Count functions should be in frames of their own to assure accurate timing.
6. Local variables are not needed and are generally slower than wires.
Lynn
Attachments:
distortion correction_set pixel1.2.vi ‏69 KB

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How does CRC 16 with lookup table work?

I have been try to get CRC16 with a lookup table to work but it does not match the CRC for a device I am trying to simulate. I have attached the code any help would be great.
Attachments:
Binary to Hex String.vi ‏37 KB

You can't just say you need a CRC-16. There are way too many parameters involved: Polynomial, Initial CRC, Data Inversion.
When it comes to a CRC with a lookup table, it uses precalculated results based on a specific CRC implementation. If you don't know which implementation it uses, it isn't really usable.
What instrument are you trying to simulate? What is the exact CRC implementation does it use?
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Problem with lookup-table and single quotes

SOA Suite 10.1.3.3. I have an ESB project with an XSLT map that uses orcl:lookup-table to translate values. I use this instead of lookup-dvm because I want non-IT users to manage the mappings without having access to the ESB Console.
According to the doco:-
G.1.79 lookup-table
orcl:lookup-table(table, inputColumn, key, outputColumn, datasource)
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The problem I'm having is that it seems if "key" contains a single quote (i.e an apostrophe), then lookup-table fails to find the corresponding value - even though the value in table.inputColumn also contains the single quote.
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<xsl:variable name="incoming">
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Thanks in advance...
Regards,
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Ok - the above was on the right track but wasn't 100% because it can't handle more than 1 single quote (apostrophe) in the input to lookup-table.
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This goes at the top of your XSLT map file...

<xsl:template name="replace-string">
<xsl:param name="text"/>
<xsl:param name="from"/>
<xsl:param name="to"/>
<xsl:choose>
<xsl:when test="contains($text, $from)">
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     <xsl:variable name="after" select="substring-after($text, $from)"/>
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<xsl:with-param name="text" select="$after"/>
<xsl:with-param name="from" select="$from"/>
<xsl:with-param name="to" select="$to"/>
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</xsl:when>
<xsl:when test="$text=''">NULL</xsl:when>
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<xsl:value-of select="$text"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
Then you call it from within the XSLT map as follows:-

<xsl:variable name="incoming">
<xsl:call-template name="replace-string">
<xsl:with-param name="text" select="inp1:myinputfield"/>
<xsl:with-param name="from">'</xsl:with-param>
<xsl:with-param name="to" select="'&apos;&apos;'"/>
</xsl:call-template>
</xsl:variable>
<xsl:variable name="dvm-text">
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<xsl:choose>
<xsl:when test="$dvm-text=''">
<xsl:value-of select="inp1:myinputfield"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$dvm-text"/>
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</xsl:choose>
Much Thanks to everyone who shares information and methods on the Internet!
Cheers,
Greg

How to create formula with lookup table

Hi, I would like to convert formula in the below to labview format, any idea how this could be done easiest way?
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br, Jani
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Solved!
Go to Solution.

Hello janijt,
You can definitely use formula node for it. What you would do is to create a constant array for the lookup table.
Here's an implementation in MathScript Node
Andy Chang
National Instruments
LabVIEW Control Design and Simulation

Lookup Table and Target Table are the same

Hi All,
I have a requirement in which I have to lookup the target table and based on the records in it, I need to load a new record into the target table.
Being very specific,
Suppose I have a key column which when changes I want to generate a new id and then insert this new value.
The target table record structure looks like this
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1 'A' 'NAME2'
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regards
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Hello, AP
You underestimate the power of single mapping :) If you could tolerate using additional stage table (with is definitly recomended in case your table from example will account a lot of rows).
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Source ----------------------------------------------------- >| Join2 | ---- > Target 2
|------------------------ >|Join 1| --> Lookup table -->|
Target Dedup >|
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Serhit

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M

Mark,
In the future you might consider creating test cases for us to work with. Something similar to the following where sample data is created for each table as the union all of multiple select statementsselect 'INIT_ASSESS' lookup_type
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select 'SPEC_STA', null from dual;Then we can either take your select statements and make them the source of a CTAS (create table as) statementcreate table lookup as
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), RFS as (
select 'INIT_ASSESS' rfs_category
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from dual union all
select 'JOB_REF', 1 from dual union all
select 'JOB_REF', 1 from dual union all
select 'SPEC_STA', null from dual
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from lookup
join (select rfs_category
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    on rfs_category = lookup_type;Edited by: Sentinel on Nov 17, 2008 3:38 PM

MDM Data model design for Main table visa vis lookup table

Hi ,
I would like to know whether the legal entities or Address table which are common for all MDM main tables like Customer ,Vendor,Material,Business Partner etc can also become a main table when their attributes are around 30-40 range.
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Thanks in advance for any idea or feasibility comments.
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Hi, Deepak
>>> - How can I populate the data in the lookup table at the same time when I am populating the main table ? I have only the XML's that correspond to the main table . I don't have seperate data for the lookup tables .
I don't think you can populate both main table and all fields of lookup tables at the same time, i.e. using same map. You can consider 2 options to upload all information you have:
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1) In case you have material master repository delivered by SAP and you use XML files which structure corresponds to SAP predelivered XSD schemas then you can use these maps undoubtedly.
2) If your repository is based on SAP predelivered, but you changed it ,you should adjust these maps due to differences in repository structure and XML files structure.
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Regards,
Vadim Kalabin

Clarity/shadows + distortion correction = terrible artefacts in high contrast areas

common example (clarity and shadows +100):
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with distortion correction
Raw file: nycz.info/temp/castle.dng

The adhoc fix I'm using for images where it's causing problems is to paint out the problem areas with a localised adjustment brush with a very large hit of negative clarity. As most of the problem areas have been pretty small it's an easy fix, but I'd like to see the issue addressed before the final comes out as close examination has shown it up on quite a few images (reflective mike against black stage background, pier edges against a bright but cloudy sky, tree branches against the sky). I've also now set my default to having lens profile distortion off and only using it where I need it.
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Best way to do a lookup with multiple tables

Hello,
I am looking for an example or how to do a lookup through ESB XSL transformation. What I am wanting to accomplish is something like below:
I am reading in a flat file and then want to use a field in that file to do a lookup in multiple tables.
i.e.
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I know that there is the lookup-table function but didnt know if that would work with this scenario. Any suggestions are appreciated.
Thanks,
Jason
Edited by: Colby J on Oct 21, 2008 11:13 AM

Hello,
I am looking for an example or how to do a lookup through ESB XSL transformation. What I am wanting to accomplish is something like below:
I am reading in a flat file and then want to use a field in that file to do a lookup in multiple tables.
i.e.
Select c.customer_name
from customers c, order_lines ol, order_headers oh
where ol.customer_id = c.customer_id
and ol.header_id = oh.header_id
and oh.order_number = p_order_num;
I know that there is the lookup-table function but didnt know if that would work with this scenario. Any suggestions are appreciated.
Thanks,
Jason
Edited by: Colby J on Oct 21, 2008 11:13 AM

Is Mapping Lookup table possible with IDOC to FIle scenario

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Ok.... I might be repeating something.... but someone
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AarokBomB wrote:
> Is there only certain ways that you can load up CLUT
files into different
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Linda Rathgeber [PVII] **Adobe Community Expert-Fireworks**
http://www.projectseven.com
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news://forums.projectseven.com/fireworks/
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Design Aid Kits:
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Attachments:
Block DIagram.jpg ‏146 KB
Current-Matrix.png ‏27 KB
Dummy-Matrix.png ‏12 KB

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How to fill Lookup table run time with desired values in project server 2010.

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Avinash kumar | Blog:http://avigr8.wordpress.com | If you found this post helpful, please “Vote as Helpful”. If it answered your question, please “Mark as Answer”.

How can i creat CRC 32 CHECK WITH THE lookup table as attached.

how can i creat CRC 32 CHECK WITH THE lookup table.attached
i creat one,but not match the result number C++ version
result number C++ version:
FE 00 18 02 40 1E 65 43 00 03 E8        CRC32=>78 1F E9 06
FE 01 18 02 40 1E 65 43 00 03 E8        CRC32=>F8 8F 49 61
FE 02 18 02 40 1E 65 43 00 03 E8        CRC32=>7D FF B4 7F

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