Bad pixel patch correction in 2D image

In one CCD image (600X800), I have few patches of bad pixels (few are in irregular shapes, few are in regular one like rectangle of 8X8 pixels). For correcting these bad pixel patches, I am looking for some surface fitting function, which should have provision for excluding the defined pixel location.
 These bad pixel patches needs to be computed by fitted surface only.

ashok_kumar wrote:
HI Thoric, 
Thanks for reply,
When I convert the image in 2D array, bad patches also comes into 2D array.
of course...
and when I tried interpolation2D.vi, it considers these bad pixels for interpolation also.
I need to exclude these pixels for fitting (interpolation). How to exclude these points ?
Kindly help.
exactly, and this is where it gets complicated. So long as you know where the good and bad pixels are you can work on subsets of the 2D array that contain only one bad pixel, replacing that bad pixel with an interpolation of the surrounding good pixels. So, try working on 3x3 or 4x4 subsets that each contain only 1 bad pixel and perform the interpolation on each one at a time, putting the new interpolated result back into the original 2D array. With a knowledge of where each bad pixel is you can attack each one singularly.
Thoric (CLA, CLED, CTD and LabVIEW Champion)

Similar Messages

  • How to add bad pixels to a DNG made from a CFA sensor raw data ?

    Hello all, I'm trying to build a proper DNG file from the raw CFA image acquired directly form an industrial camera.
    As usually there are a number of bad pixels around and I would like to mark them in the DNG so they can be correctly interpolated when the image is processed.
    In the latest DNG SDK (1.4) I've only found this rather thin references:
    "Defective Pixels
    There are two ways to deal with defective pixels in DNG.
    The first is to map out (interpolate over) the defective pixels before storing the raw data in DNG.
    The second is to include a bad pixel fixing opcode in the OpcodeList1 tag."
    OK, as each program/customer/etc. seem to have its own ( best ) algorithm to interpolate the bad pixels then OpcodeList1 it is.
    But then I've got this: FixBadPixelsConstant and I'm not clear about its usage, especially BayerPhase, is the same BayerPhase that is specified as a global property of the CFA or it is something separate and what ?
    Also is there some "industry standard" value for the Constant that will make more likely the established programs to process correctly the image ?
    And this Constant value is unique per DNG or can it be more ot them added, i.e. to somehow characterize the "badness" of the pixel, like reduced sensitivity, stuck at 0/max, etc ?
    In the end if somebody can share an one-liner on how to add programatically this tag using the SDK I'll be very grateful.
    Sorry for my newebie questions and many thanks for your help.

    Hello Dear
    Look FB60 screen has two parts :
    The one in which you enter information related to vendor is Header Level, in this case you already assign Personnel No. in Vendor Master so no field is required as Personnel no. will be picked up from Vendor Master level.
    The Other is line item level is bottom half part, if you want to assign personnel no. at Expense G/L level then if you scroll right you will find a field for Personnel no. If you can't see the field check your setting at OBVV for the field status group you assign to particular Expense G/L.
    Hope you Understood
    Cheers
    IMK

  • Bad pixels in the camera sensor

    I've got an iPhone 4S, 64GB (Verizon) and noticed a few bad pixels during video playback on our 42" TV (played back via the HDMI adapter).  It's something that most people would not notice, including my wife as she watched the video with me, but I'm a long time video/photo enthusiast and imperfections like that stand out to me like a pimple on an otherwise perfect looking face.
    After several test videos and even photos, I am able to reproduce this pixel anomaly each and every time.  There are 3 pixels, just slightly to the left of the center, that show up incorrectly in kind of an obtuse triangular formation.  Two of them favor white, the third is dark.  It's not something that is noticeable on the iPhone 4S screen because not all of the pixels are shown, but on a monitor that can render *all* pixels of 1080 HD video playback they show up.
    I'm certain it's not dust as I've inspected and gently cleaned the camera window, not to mention even a small spec of dust would not show up as a single pixel (or in this case, what appears to be two pixels right on top of each other for each of the problem pixels).  The anomaly shows up when lighter colors/gradients are present in that region of the screen.  Darker colors do not reveal the bad pixels.  Just to be clear - it's NOT a screen display issue - the pixels are noticeable on our 42" TV during playback, and also on my Mac monitor and iPad screen (ONLY when zoomed in viewing on my iPad, which is possible during playback of video using the stock photo app).  The bad pixels jump around a bit because of the digital image stabilization (that should make sense to the more hard core video enthusiasts), which further supports it is a capture issue, not a video coding problem or anything like that.  The issue is either with the image sensor itself, or the hardware's processing there of.
    My question - has anyone else observed similar behavior?  If so, is there something  you're aware that can be done to correct it?  This is my second iPhone 4S, the first being a perfectly-functioning 32 GB model (which did not have this issue) that I returned in favor of a 64 GB model because I was burning through space too quickly.
    I'm probably going to have to go back and try to explain this to the good folks at the local Apple Store, and try to get a replacement unit, but I'm not looking forward to having to show video samples and point out three teeny little dots that most people won't even notice, but drive me crazy (especially after dropping $400 plus tax and a two-year commitment).  A huge selling point of my iPhone 4S was of course, its superior photo and video capabilities.  I understand they're not pro quality, but there shouldn't be any consistent pixel issues like this going on.
    Sorry for the long post, but I'd appreciate some feedback, suggestions, input.  Thanks.

    pogster wrote:
    The problem with this type of communication is what you are describing and what I think you are describing can sometimes be different so my apologiies in that regard.
    No worries.  I agree - text-only communication can be a rather clunky experience in trying to convey complex issues without any visual or (2-way live) verbal means.  I was a bit worried about being too wordy in an already wordy post and feared that it might just be ignored if it was too long.  Again - I appreciate your chiming in.  You seem very knowledgable in digital photography, which is exactly what I was hoping to find.
    Given that my description of "bad pixels" is a bit sloppy for what is really going on, I think you understand what I mean in my usage of those words.
    To answer your question, the offending pixels, or very, very small little dots of imperfections, are present in both video playback and in still photos.  After shooting several test videos against neutral and textured backgrounds to see what kind of results I'd get in the appearance of the bad pixels, I also took several stills in "burst mode" using an app called "Camera-" against a wood grain background, as the woodgrain background offered the most visible and consistent view of the blemishes.  In motion video, the dots (bad pixels) are pretty easy to see on a large display, or when zoomed in during playback on my iPad 2's screen.  In stills, it was kind of tricky to identify them, because without the persistent motion of the background, the bad pixels almost blended in as random image noise.  I was however, able to identity with certainty the same bad pixels in most of the stills.  Additionally, at the higher resolution of the stills, the offending pixels almost don't even need masking or removal with photo editing software.  Like I said - without the constant visible background motion to make them stand out as irregularities, or the ability to do a frame-by-frame analysis (which I can do easier with the video file using an app called VideoPix), the bad pixels are more difficult to identify.
    The importance in identifying the bad pixels in stills, even though they are practically not noticeable, is that it can now be determined that the bad pixels are not the result of some kind of video coding glitch, but rather present in the hardware of the device itself - either as a defective image sensor, or defective hardware that translates the data from the image sensor into the pixels utilized by the software for photos and video.
    As part of the tests I ran, I captured video with an app called KingCamera, and it, too, produced the same results.  KingCamera also has an option for "locking" of the auto white balance and brightness, loosely similar to setting those manually on a higher-end, dedicated camera.  Even locking the white balance and brightness, the pad pixels were present, so the potential for the issue being caused by an anomaly in the software's auto-settings management were put to rest.
    In regard to being able to correct the bad pixels in stills - yep, easily done.  BUT, I shouldn't need to.  In terms of correcting them during video playback, that *is* actually something I could probably work out a method of doing.  I used to dable in production videos that involved complex imaging filters, multiple composite video layers, and automated ways of identifying specific colors, contrast points, and patterns within images/video streams and altering them (such as cleaning up sloppy image mattes or locking in on visual patterns for the application of various video effects).  Again, this is something I *shouldn't* need to do.
    The still photo and video capabilities on the iPhone 4S are outstanding, in contrast to what other similar existing devices offer (arguably better than or almost as good as the best competitor offerings, depending), but the quality is not DSLR, and like I said - I'm not expecting it to be.  I do expect however, and I don't think it is unreasonable to, image rendering without persistent "bad pixels" showing - even if I am only in the 1% of people who are likely to notice such image defects.  They are, in fact, defects, and not "normal operation for a device of this caliber".
    I was hoping there might be some trick to correct them, but I kind of figured there would not be.  It seemed smart to at least reach out and see what other people may know that I might be missing.  Again, I regret terribly my poor decision to return my perfectly-functioning 32 GB iPhone 4s for the 64 GB model.  Knowing a little about the very intricate technologies that make these things seem "magical", I understand that there are dozens or even hundreds of very complex little components that are mostly stamped out on an assembly line of robot fabrication means, then assembled, at least in part, by humans in a factory who are required to pump out x number of these things in short periods of time.  I worried about the possibility of trading in my perfectly functional device for something that may be just a tad less perfect - just because of the odds.  My bad for not following my natural instincts on this one.  I just didn't want to have to constantly be managing space on my device.  I failed to think through my initial choice of the 32 GB model in regard to my trigger-happy photo/video nature.  The cumulative files are much larger on this device than I was initially expecting (because I was just too excited to get my hands on one on October 14 and failed to do enough research and calculations).  Days into owning my 32 GB 4S, I was already spending time, almost daily, re-rendering videos at 720 and 580 through iMovie, being somewhat irritated about having to replace the original videos with reduced resolution versions just to keep the videos live on my iPhone (sometimes archiving the originals on my Mac first).  Anyway - enough of my rambling.
    Thank you again for your input, pogster.  If you have any other ideas, please share.  I'm pretty sure I know what I have to do to feel happy with my investment, though.  I'm just not looking forward to complaining about 3 bad pixels to a Genius Bar employee who's probably going to look at me like I'm one of those "never happy with..." people.  Three bad pixels that I won't even be able to show ON the actual iPhone itself, but rather bring my iPad 2 and show zoomed-in playback of the video footage.
    Message was edited by: ascii-T - fixed type-o

  • Bad pixel camera

    on my iphone 5, when taking the back camera shows a small purple dot,maybe bad  pixel.what to do?

    if when you transfer the image to the computer
    the pixel issue is gon
    then it's the lcd on the phone not! the camera which have the problem
    cameras don't have pixels in the repsect that lcd screens have

  • Screen has a bad pixel

    How long does it take to get your phone back if you send it in for repairs or will they swap it out for a new one?

    They'll likely just replace your device.  That's what they did for my first one when it had a bad pixel.... and my second one when it froze during voice input during navigation or texting... and my third one when it wouldn't scroll all the way down to the end of my photo album... and my fourth one because it was an unacceptable replacement (case not aligned and nicks on the edges).  BTW the 3rd and 4th ones were "factery certified like new"... yeah right. 
    If you call them on the phone they'll just send you a "new" one with a return label for yours.
    I gotta tell you, I really like the functionality of this phone when it functions correctly but this is getting ridiculous.  Maybe I'll start a new thread with my gripes to see if I'm in this boat alone.

  • I downloaded a vector file from Shutterstock. How do I edit the text in Photoshop? If i enlarge the image- the pixels are awful and the image is distorted.

    i downloaded a vector file from Shutterstock. How do I edit the text in Photoshop? If i enlarge the image- the pixels are awful and the image is distorted.

    jessicae28493569 wrote:
    i downloaded a vector file from Shutterstock. How do I edit the text in Photoshop? If i enlarge the image- the pixels are awful and the image is distorted.
    What is the file format of the vector you downloaded?  Custom Shapes have a .PSP extension, and are placed according to this table.
    Preference filenames and locations in Photoshop CC
    They will then be loadable from the Custom Shapes drop down — click on the cog icon > Load shape > Find your downloaded vector.
    Once placed in the image, it will appear as a Shape layer, and can be edited with the Path, and Direct Selection tools (black and white arrows on the toolbar)

  • Bad pixelation on all 3 Sky +HD boxes

    I'm get bad pixelation / no picture on the same channels on all 3 boxes. Signal strengths/quality varies but the channels are 419, 426 (but 458 is OK), 428, 508, 510, 513, 514, 515, 522.Installation is under warranty. Do I need an engineer?

    Cancelled engineer . Worked out that it was growth on top of adjacent hedge that was weakening the signal and these channels were affected the most.

  • Bad pixels on iPhone when playing video

    Hi! I have just purchased the iphone and am facing a peculiar problem. When I play video in either youtube or Safari (quicktime), after a while, the video quality deteriorates, i.e. a lot of bad, discoloured pixels start appearing. And this only happens with video playback. The discolouration does not appear if I switch to viewing photos etc.
    Is this a common problem? Is it related to the iPhone overheating? Should I go to the iStore and get my phone replaced?
    Would appreciate any thoughts/answers.
    Thank you!
    jd2334

    I've had issues with stuck pixels and The Apple Store agreed for an exchange. Using your iPhone, point your Safari browser to this site to check for bad pixels: http://www.ebaspace.com/iphone-app/#_home
    That's the sure way of finding out. And if you have it, just go back to your local Apple Store and use the same website to show the person from the Genius Bar.

  • Bad pixel preview with bitmaps

    Hi,
    Is there a way to overcome the bad pixel preview me and my colleagues have in Illustrator CS5 when using bitmaps?
    In CS4 we never had such a problem, now there is for bitmaps almost no difference between the overprint preview and the pixel preview.
    In other words - noisy (like in the Photoshop noise filter)!
    That is a real problem because we use bitmaps a lot for fabric prints and T-shirts.
    Please advice

    For the same reason as the guys on this topic are complaining....
    http://forums.adobe.com/message/2786211#2786211
    There is allmost no difference now  between the overprint preview and the pixel preview when we talk about bitmaps...
    Please dont answer the same things as in the linked topic. Let me know if there will be a fix or not. That's all I want to know.
    In meanwhile I'll continue working on cs4 - because a that nice preview is crucial for our work!
    Kind regards,
    Klaas

  • Is it possible to tell me how i can make program in labview that take pixels of black and withe image and give coordinate of black or white pixels back to me.

    hello everybody
    is it possible to tell me how i can make program in labview that take pixels of black and withe image and give coordinate of black or white pixels back to me.
    Solved!
    Go to Solution.

    Here's a slightly simpler version.
    (Depending how you want to process the output, you might not need to traspose and/or reverse. Boolean to 0,1 works directly on the 2D array if needed )
    amkamyab wrote:
    it is good. i could enter 1bit image in and show it in array. now i want to take pixels coordinates. i meen i want to have (x,y) of each pixel to send it pixel coordinate to another program i wrote for steppers motor.
    Can you be a bit more specific on how the output is supposed to look like? Initially you wrote "black or white", and since all pixels are either black or white, do you want to send all pixels? In what format? In what order? Please clarify?
    LabVIEW Champion . Do more with less code and in less time .
    Attachments:
    BW-Pix.png ‏8 KB

  • I have a few bad pixels , how can i fix it?

    i just have bought my ipad 2 5 days ago and it has 1 dead or sleept pixel, what can i do?

    There really is nothing you can do yourself for bad pixels.  You need to make an appointment at your Genius Bar at your Apple Store.  They'll check it out and when they see dead pixels, they'll replace your iPad.  If you've already loaded music, pictures, mail, apps, etc., make sure you back up your iPad before going to the Apple Store.  And make sure you write down all your passwords, etc., so it's easy to set up your replacement unit.

  • Bad pixel-what does it look like

    I have two small spots on my 20" cinema display. They are irregular in size and dark. What are they?

    It is helpful to inspect for bad pixels using a test pattern program like the following:
    http://www.versiontracker.com/dyn/moreinfo/macosx/23237
    Usually bad pixels will show up better using solid primary color screens. This is because it is usually an individual sub-pixel that fails, meaning just one color will fail among the Red, Green and Blue sub-pixel that makes up every "white" pixel.
    If the spots on your screen are always dark and irregular in shape but still small, like the size of a text period symbol, then it could be some kind of contamination or particle inside the screen. Good luck.

  • Bad pixels

    Whats the maximum of bad pixels/subpixels that a 23"ACD must have in order to be replaced?

    I believe Apple's "tolerance" is five. But it may vary based on how much noise you can make. You also have a 14 day period during which you can return the product for any reason.

  • Bad Pixel in Camera

    Just got my K1 and have been going through the preloaded apps.  All was fine until I opened the camera.  There appears to be a bad pixel in the camera, near the center of the screen.  It is there regardless of whether it is set to still or video.  It appears in any picture or video taken.
    What is the repair process here?  Will the whole system just get replaced?  Can the camera just be replaced?
    Solved!
    Go to Solution.

    Chooks,
    Why not bring it in to work on Monday and well have a look at it?   If the camera has to be replaced we can set up service, but it will be good to see what you are talking about before it is repaired.
    Mark
    ThinkPads: S30, T43, X60t, X1, W700ds, IdeaPad Y710, IdeaCentre: A300, IdeaPad K1
    Mark Hopkins
    Program Manager, Lenovo Social Media (Services)
    twitter @lenovoforums
    English Community   Deutsche Community   Comunidad en Español   Русскоязычное Сообщество

  • Bad pixel or?

    I have noticed a very tiny pixel on the bottom left of my screen that almost looks like a pixel-sized 'light'. It is very distinct and appears white. Is this some kind of sensor behind the screen or a bad pixel?

    *"My laptop is about 2 months old - will Apple take it back and give me a new one?"*
    No. 1 bad pixel out of the millions on the display is considered acceptable by today's industry standards.
    If it's stuck you can try rubbing it out.

Maybe you are looking for