Example of signals with a filter anti-aliasing

Similar Questions

• Filter low pass analog (anti-aliasing filter) external to the NI USB 6251 housing

  Hello everyone!

  -I m trying to acquire an analog signal of tension (high frequency content) using a connected to an edge NI USB-6251 BNC-2110. I learned in this Labview Forum that NI USB-6251 has no analog low-pass filter programmable (or anti-aliasing filter), so that I can't help but jitter when scanning my signals. For my application, the cutoff frequency of the analog low-pass filter must be equal to 100 kHz or MORE (maximum of 500 kHz). A possible solution to solve my problem, would be to work with an external analog low-pass filter before you scan the voltage signal. Based on this I'd like to know:

  (1) national Instruments develops analog external filters? I need a filter which also has one output, analog, so that I could send also the low-pass analog filter filtered signal to my NI USB-6251 box to scan correctly it!

  (2) what model of external low pass filter would be compatible with the NI USB-6251 housing?

  Any help would be much appreciated!

  Best regards!

  Hello

  all high resolution of the M series (628 x) cards are equipped with a filter low pass which can be enabled or disabled programmatically. For the anti-aliasing filter feature, examine the boards of National Instruments DSA (dynamic signals Acquisition) acoustic and vibration measurement
  currently the NOR 9221, 9225, 9227, 9229, 9233, 9234, 9235, 9236, 9239 and 9237 C Series modules feature anti-aliasing filters. These modules are intended for the high accuracy measures for which anti-aliasing filters are a necessity.

  Houssam Kassri

  OR Germany

• The anti-aliasing filter selection

  Deal Sir

  I want to choose the anti-aliasing filter. I data collection in real time of current through NI Mseries 6281 DAQ probe. My sampling rate is 8 kHz and Total number of samples 40 k. What is the value of the frequency, should I choose for the anti-aliasing filter?

  Deep eyes

  Automata

  Yes. That should be fine.

  Lynn

• Why my text have jagged edges (even with anti-aliasing on smooth)?

  I put anti-aliasing on smooth, 100% zoom, and it always looks terrible. Not use the fake bold or italic. I tried "reset character" and he looks even worse. Tried also all other anti-aliasing options. Honestly, I can't think of anything else.

  It's may be the police good "cheap", but I've included someone of another image using the same exact font and it seems. What is going on? I've never had this problem before. The only thing I can think is that I have just started using photoshop on my Macbook, do Mac ttf files not read correctly? Any help would be appreciated.

  With the help of CS6 and MacBook Air.

  vs the two png at 72 dpi.

  Solved. In case someone had the same problem, it's because I was typing under a layer of levels rather than above it.

• Which past now and not days ago = > publication of text captions with anti-aliasing off the coast looking for really bad.

  I reported the bellows of text and I'd like to know if it happens to someone else.

  Concise problem statement:

  When you publish buttons with text or text with antialiasing off the coast, the result is very bad.

  Last project I cancelled 2 months ago and it seems good. But when I did a few changes yesterday and I published it again all the buttons and links that they looked very bad.

  I tried with different computers, where they have installed captivate and I have reproduced the bug how I show below and in any place of same problem.

  I can't show the client the changes because the evil look textfields.

  I tried to reinstall all the options, Captivate and install older versions of flash and nothing plugin, everything looks the same. Probably a windows update may cause the problem, I don't know.

  
  Steps to reproduce the bug:
  1. black background or dark color
  2. create the button and select Properties
  3. Select the text color color yellow or clear, size of large font (24-30) and transparent background
  4 publish

  Results: no text no embattled arround White halo, eat as the text. The part of the text is a bit fuzzy.

  Resemble the translucent color part of the text to produce somehow anti-aliasing is white in color.
  
  Expected results: the net image as html on browser text.

  Hi again

  Well, it give a try.

  Minimize all applications that you can see the desktop.

  Right click on the desktop, then select Properties.

  Click the appearance tab.

  Click on the effects button.

  You see an option called use the following method to smooth edges of screen fonts?

  If so, disable the option and click OK.

  Report back if you still have this option and, if so, if you erase it helps.

  See you soon... Rick

  Useful and practical links Captivate wish form/Bug report form Certified Adobe Captivate training SorcerStone blog Captivate eBooks

• cRIO thanks the Module NI 9237 bridge in the Interface of scanning and Anti-Aliasing

  Hello

  I have questions about the use of a Module NI 9237 bridge with CRIO and its use in Scan Interface mode. The manual speaks the data rate of the module, and a (n) parameter that can be set to adjust (to a minimum of 1613 Hz) which in turn puts across the module built in anti-aliasing filters. It seems (but not explicitly stated) that this data rate setting is available FPGA programming mode.

  Our application is currently running in mode Scan Interface, so my question is what is 'throughput' module (and therefore anti-aliasing filters) mode Scan Interface? And, if we have the analysis period the value 10msec (100 Hz), y at - it no filtering of the anti-aliasiing of software provided automatically by scanning interface itself related to the period of scanning? Or all the anti-aliasing extra something that we must build within ourselves? I looked at the example provided with Scan Interface and there is nothing more.

  I don't understand about anti-aliasing, just need to clarify what is happening for this specific module mode Scan Interface.

  Thank you

  Andy

  Hi Andy,.

  I had to have a quick sleep on this night to get my facts right, hope that the delay was too long!

  The minimum data listed in the 1613 samples/s are due to a forumla that uses the internal time base that is fairly well explained on page 20 of the Manual. The sweep period did not affect the rate of data, or to activate the anti-aliasing filter. My previous post was wrong in that sense, apologies!

  This page helps explain mode of scanning pretty well too, but the best way to explain it is that even if the frequency of the module can be attached to 1613 samples/s or higher, the compactRIO will collect only 1,000 of these samples a second, or in your case if you are using a rate of 10ms loop, 100 of these samples of 1613. The anti-aliasing cut will be based on 1613 x 0.45 as you said and so will be 725Hz (not based on the rate of loop as I mentioned incorrectly)

  In this case with these modules it is probably a good idea not to use a period of scanning slower than 1 msec for the reason you said - if you're worried about oversampling you can always you decimate readings in the software afterwards to take each readings from 1 to 10 (this page explains how do with an eerily similar situation!)

• Problem with animation line flicker/aliasing

  Hi I was wondering if anyone had any suggestions on trying to get this smoother animation and a little crisper.

  I know that the quality will be slightly less good in a gif format.

  https://S3.amazonaws.com/uploads.hipchat.com/115279/3089179/b6GFClDGSBHAucu/lines.gif

  Thank you

  Let me give you a few basics. These are things that are not considered by almost everyone that starts working in the video, especially those who come from a print or web design background. Photographers are also victims of a flaw in their knowledge which is understandable because they have never had to deal with things like this before. Here are the facts.

  First Point:
  Video (and everything that comes from digital displays) are always arranged on a grid of pixels. No exception. You can never put a line width of single pixel on this grid of pixels and do appear as a single pixel line, unless it lines up perfectly. Nothing that is not precisely aligned to the pixel grid is interpreted. It is called Anti-aliasing. This means that if your 1-pixel thick line is to halfway between grid display will be the average of the values in this row and you end up with a broad line of two pixels on the screen with each line taking half the value of the color of the original line. In other words if you are not precisely aligned on the grid of your 1-pixel wide black line becomes a 2px wide gray line.

  Second Point:
  Video is composed of images that reading at a particular rate. Your screen also has a refresh rate. Display rate standard in countries that have 60 Hz electricity usually have a refresh rate standard 60 Hz or multiples of a whole number of this rate divider. In countries where electricity is 50 Hz (Europe), the refresh rate is usually 50 Hz. The video frame rate for video in NTSC countries (most of the world) are normalized to 29.97 FPS (there's a reason associated with the problem of broadcasting TV signals in color, but I won't go into that right now). The Standard in PAL countries video frame rate is 25 fps. When you choose a frame rate for your video project which is not the frequency of standard images for your area, you may rate for your video come into conflict with the cadence of your screen. This can cause perfectly smooth motion judder and there is nothing you can do about it, except change the refresh rate of your screen or lift it up with a new high refresh rate capable display or change the frame rate of your video.

  Third Point:

  The average human eye and brain have a property called retinal retention. These effects how we perceive motion. No matter what you do, most people perceive incorrectly flexible movement across their field of vision. Most of the time the brain tries to iron out things and your eyes automatically try and follow this movement. This effect is well understood by the great directors when they block shots and the great directors of photography when they put cameras if your eye is directed to the part of the frame where they want that to get you to understand the history.

  Fourth Point:
  There is a strobe effect that applies to all the movements. For example, if you watch an old movie on TV western, you will sometimes see the wheels of the car rotate backwards. Smart of an airplane propeller video phone can show you that strange Sword-shaped blades turn slowly or even backwards. It's the interaction between pace and movement. The only way to create videos that shows the movement correctly and in the right direction is to match the query of the cadence.

  Fifth Point:
  Work around the fine lines, turning it into a thicker lines is to disable interpolation. You can do in After Effects by selecting quality draft. With quality lit project, you will always have a thick black line of single pixel. This solves a problem, but worse the other. The problem of the stroboscopic effect. To make your single pixel with black line SOUPLESE you must match the query of the line to the frame rate. You move 1 pixel by image or 2 pixels per image or 3 pixels per image or 4. You cannot move to 1.4 or 2.8 pixels per image. It won't wok, it would never work.

  Sixth Point:
  Even if you perfectly fit the pixel grid movement, you can still run on the retinal retention problem and frame rates. Every Director of professional photography with a value of his day rate knows that there are critical speeds of Pan - speeds during which you can not move the camera in a scene and offer a scene that doesn't pan and look terrible. Jerking can be so bad that it gives people headaches and worse. The frequency of images the more cautious, be with the camera. When the video cameras of 24 frames per second were introduced a whole bunch of people came back with horrible images. Shots that run at 29.97 work at 24. Cadence, retention of the retina, strobe effect and your brain combined with no fixed focal point for your eyes to focus on and track combine to fault up to the shooting and of the query.

  The solution:
  When you want to animate a thin line, you're better off at 29.97 frames per second that anything slower. 30 is OK if you go never broadcast or DVD to watch on a TV. You can use an expression to control the movement, so that your line moves exactly an even number of pixels per image. If your design requires that go you faster you must hide the problem with motion blur. If you want to lighten in and clear it of movement then you must hide the problem of aliasing with motion blur. Smooth long moves must be exactly to an even number of pixels per image. You have more options of speed at a higher speed. Even at a higher speed, you will encounter the problem of the sixth Point.

  The evidence:
  Any problem of smoothing by giving you the discount gray lines load the rendering of your lines animated in AE and step as part of an animation at the same time. Baring any cache image and to make the issues I bet that your animation will run without difficulty from one image to the other. It is only when the video plays back at speed that your eyes and your brain will tell you that the movement is uneven.

  Certain standards:
  Go to a cinema and watch the end titles. It takes about 7 or 8 seconds (depending on the height of the frame) for securities to roll from the bottom of the screen upwards. The second seven rule is pretty standard. With 29.97 FPS 1 video per image pixel, 2 pixels per image and 4 pixels per image work well enough for most applications. When you find a speed frame rate works for your video, it's the frame size and it is write it down. Use it again and again.

  This is an expression that works at the speed of the animation and allows blur to apply to your image. You can do the movement meet the markers if you want to start and stop. I have a bunch of preset animations that I use all the time for that style of animation.

  Bottom-up:

  t = time;

  en = t/thisComp.frameDuration;

  x = value [0];

  s = 4; Speed in pixels per image must be an integer

  y = value [1] - (fr * s);

  [x, y]

  Left to right:

  t = time;

  en = t/thisComp.frameDuration;

  y = value [1];

  s = 4; Speed in pixels per image must be an integer

  x = value [1] - (fr * s);

  [x, y]

  If you wish to reverse the direction, you can add a sign less in the final table or apply the term of anchor instead of position. These expressions take the initial starting position of the layer as a starting point. Both are moving to 4 pixels per image. To start and stop the movement, the simplest method is to split the layer, add the expression, let the layer move, then divide the layer again and delete the expression. If you are handy with expressions, you can bind the movement to layer markers, and then just move the markers for start and stop, or even reverse the direction of a single layer.

  If you don't want to mess with all those unbreakable rules then jack up motion blur and uses a higher cadence with thicker lines and hidden defects. There are no other solutions.

• Anti-Aliasing feature in graph does not always, but inexplicably...

  I noticed a strange bug of Aliasing in the graphical indicator in my labview 2014

  I have attached a file that has two supposedly identical graphics but on my PC (windows 7, i-3 dual core, 8 GB Ram) charts two different display modes.

  The one labeled "aliasing problem" is jagged when anti-aliasing is turned on and when is broken. The other table behaves as I expect and I'm used to.

  (1) - does anyone see this difference as I do?

  (2) can someone explain the reason for this phenomenon?

  much obliged for any comment

  Thank you

  I see the same thing:

  

  There seems to be a bug specifically with the graph of scan (with the line). Power off the line, updates work fine. Also, turning aliasing seems then redraw the map with the correct folding (you can see that at Midway through the data on the first plot). You could try periodically calling the method "Force redraw' to see if that makes aliasing to update. It seems also set when you stop the VI.

  Weird bug since it is only on one of the graphics.

  (Also... What is with all the local variables and signalling of the value? (And the weird to leave timeout?)

• anti-aliasing using the 9233

  
  

  Hi Jeff,

  The first thing that you should start with is a guide to the delta sigma converter:

  It is the ADC that is used on the 9233. The delta sigma converter has a built-in inherent anti-aliasing filter. If you look at the dynamic features section of 9233 operating manual it will show you some of the features of this filter. The filter is a digital and the bandwidth and the stopband are calculated according to the sampling rate, you specify the 9233. If you give a sampling frequency of 50 kHz,-3 dB attenuation point bandwidth will be 50 k * 0.45 = 22.5 kHz. If all the components below 22.5 kHz will be kept completely and everything above that will be alleviated. This ensures that you will get no aliasing.

  If you apply a 20 kHz filter after that you'll still good data because the threshold for the anti-aliasing filter is greater than the maximum sampling frequency (50 kHz).

  Please let me know if this clarifies this question a little better.

• CC of the Illustrator's anti-aliasing to white (?) on the edge of the exported TIFF

  Example of how to reproduce the problem is quite simple:
  On project empty to create rectangle in any color (let's make it green).
  Export to TIFF with any anti-aliasing option turned on.
  Exported TIFF gets extreme right and bottom line lighter pixel, because it would be anti-aliasing on the edge with something white.

  How can I get rid of this and make these same two lines at the top and to the left (no lighter color). I need to sample for tile seamless and the only way to be, I found for a moment is 'manual' correction of these two lines in any bitmap image editor.

  Same problem is with JPG and PSD export. Export WMF gets white line at the bottom (not lighter green, but white). Export BMP rectangle gives solid green without lighter lines, because I want it to be.
  As I do a tile seamless for printing on fabrics, I need to format PSD or TIFF with ICC profile. Of course my tile is not as simple as the clear green rectangle, but it's easier to reproduce the problem I found.

  Try another resolution, as a multiple of 72; 288 ppi.

  300 / 72 = 4, 166666666666666666

  Is not a round number, causing anti-aliasing.

• How to disable anti-aliasing when layer resizing

  [PhotoShop Elements for Mac Version 6.0]

  Hello

  I want to resize a layer for example the orange ball:

  

  But if I resize the layer of the ball and confirm the resizing automatically apply a smoothing that is not desired in my case:

  

  How can I stop this?

  Thank you very much!

  Also if you have other layers that you want to resize, you can go ahead and free transform allows you to resize your object.

  Then go to filter > Pixelize > facet to remove the anti-aliasing. You may need to run the filter facet several times to completely eliminate anti-aliasing.

• Bug in CS5 render anti-aliased text in "save for web".

  Looks like there is a bit of a bug when using 'save for web and devices' with light weights of type in CS5 for Mac. Although the slim type looks good while working in Illustrator, as soon as you enter the "Save for web" dialog, it gets seriously distorted. It seems that this issue has been present at least since CS4. It happens not in Photoshop. It seems particularly bad for light text on dark background.

  Some people may say ' of course, Illustrator is not really intended for work intensive bitmap. However, with features like "look pixelated" and 'hold on to the pixels', Illustrator is (usually) become a very effective way for web design, and personally I prefer it to Photoshop. It is also clear that Adobe intends it to be used in this way. In order to make anti-aliasing bug is certainly a problem. Just surprised that they don't have not address it when CS5 is born.

  I have implemented some images on http://www.thesheep.co.uk/2011/06/24/illustrator-save-for-web-anti-aliasing-problems/ example to illustrate the problem.

  Are there any smart workaround for this? It's a bit annoying to have to hover over stuff in PS before exporting, but maybe that's what I have to do. I hope that Adobe will address this soon.

  In save for web go to the "Image size" tab and select type optimized menu. It takes the smoothing parameter that you selected in the character Panel.

  Get better when you do it like that?

• Static text not anti-aliasing in CS3/AS3

  I imported Helvetica Roman 55 (FTT) in my library, point 14 and called it f-Body Text *. I have all three types of text boxes: static, dynamic, and input. The font size varies from 18 to 14 (most is 14). Anti aliasing is set to "readability." Everything is perfect in the authoring environment. At time of execution that the dynamic and input text seems perfect, but all static text is put in correspondence of the bits.
  
  I tried to adjust the custom anti-alias and used extreme smoothing, text is blurred, as expected in the environment, but bit mapped in the SWF creation.
  
  I tried Arial instead of Helvetica, same results.
  
  I tried to change the static text to dynamic and integrated the characters required only, this has solved the problem and may be a possible work around.
  
  Anyone know what is happening?
  

  Applied CD

  > Must refer to as much as I know all the static text
  > the symbol of the police.

  The problem is only the dynamic text fields support the outlines of fonts embedded.
  If my hunch is that your static text fields are doing the best they can with
  they are given. Note, for example, that the character button incorporation
  (in the property inspector) goes away when you change a text field to
  public static.

  > I? ve already taken the lead and change all my static text
  > dynamic, integrating specific glyphs required, deactivation
  > the? selectable? and by setting the multiline property
  > as required.

  Yes, that would do, but try to change a return to the static and point
  He the real police rather than the symbol of the police. Static text fields
  stir in automatically, and it is much easier to maintain in this respect.

  David Stiller
  Adobe Community Expert
  Dev blog, http://www.quip.net/blog/
  "Luck is the residue of good design."

• Ugly anti aliasing in Fireworks CS3

  Fireworks has a bad method for the creation of anti-aliasing.
  
  Two problems:
  -only 4 colors to paint the outline of the object
  -extra pixels on the sharp edge
  
  The image of these two problems
  
  How to fix these now, and if they would be resolved in a future well?
  

  OK...

  I put 'Pix' in a script font, which is the worst thing you can do. I've made two copies. One in 25 pt and other PT 100, which is 4 times bigger. The 25 pt chain is 20 pixels high and the pt 100 chain is 80 pixels high. I exported the image, reduced to 1/4 of its size and it added in the original comparison image.

  Here are two screenshots, one to 300% and the other to 100%.
  test alias fonts at 300%
  Police alias test to 100%
  The reduced graph is shown with a drop shadow. As you can see, the smaller version of the 100 PT string is aligned exactly with guidelines for 25pt chain. It is also a better reproduction of the characters of fonts.

  (Note that I would never use this font at that size).

  As long as you reduce by the same factor that raise you, your math will work out.

  Here's another example, I found in my Photobucket account when I saved these examples for you: double and half Arial text

• I can isolate a bookmark with the filter, but how 'find' a bookmark in the hierarchy of the ShowAllBookmarks window?

  I want to find a bookmark to its location in the hierarchy of bookmarks, but all I can do with the filter is isolate a bookmark [s]; or by using the filter bar bookmarks, or in the ShowAllBookmarks window. For example, I know I have bookmarked some, but I want to move it into a new "folder" and rename it, perhaps; for this I need to be able to * see * in the hierarchy, as in the Mac Finder, when the filter turns into a file, and then "Show Original" to "Open the enclosing folder."

  Watch these extensions:

  • Show Parent Folder: https://addons.mozilla.org/firefox/addon/show-parent-folder/
  • Go Parent Folder: https://addons.mozilla.org/firefox/addon/go-parent-folder/