2019-01-04 01:31:34 -0600 | asked a question | Link error with opencv 4.01 on os x Link error with opencv 4.01 on os x Hi everybody, since opencv 4 I have a link issue with my program on os x. Do you hav |
2018-03-21 16:07:07 -0600 | commented question | Homography transformation + scale Works great, many thanks. |
2018-03-21 04:39:54 -0600 | commented question | Homography transformation + scale Oh gosh. This is exactly the same question. I'm so confused. Thank you, I will make some tests and will give you feedbac |
2018-03-21 03:55:47 -0600 | asked a question | Homography transformation + scale Homography transformation + scale I have a transformation between 2 images. I've computed the homography matrix. Applyin |
2017-12-07 05:30:43 -0600 | commented answer | Get a 2D gaussian kernel for deconvolution So easy. Sorry for this dummy question :). And of course, thank you for your answer. |
2017-12-07 05:30:07 -0600 | marked best answer | Get a 2D gaussian kernel for deconvolution Hello, I am trying to apply the Lucy-Richardson deconvolution algorithm with the following code: I get the psf mat with The problem is that this kernel is a 1D kernel but I would like to apply a 2D one. I believe I could apply the kernel two times (in X direction and Y direction) to get the result I want. But how I can do it ? |
2017-12-07 04:46:13 -0600 | asked a question | Get a 2D gaussian kernel for deconvolution Get a 2D gaussian kernel for deconvolution Hello, I am trying to apply the Lucy-Richardson deconvolution algorithm with |
2017-10-19 03:49:52 -0600 | commented answer | Trying to remove artefact with interpolation Oh fine. Thank you |
2017-10-18 09:34:27 -0600 | commented answer | Trying to remove artefact with interpolation @LBerger: Have you seen my last message ? Sadly I did not manage to run your code. |
2017-09-20 09:50:05 -0600 | commented answer | Trying to remove artefact with interpolation @LBerger: Sorry for the huge delay. I tried to compile your code but too many errors. See errors: http://hpics.li/5e9888 |
2017-09-20 09:45:35 -0600 | commented answer | Trying to remove artefact with interpolation Sorry for the huge delay. I tried to compile your code but too many errors. See errors: http://hpics.li/5e98888 |
2017-09-20 09:43:25 -0600 | commented answer | Trying to remove artefact with interpolation Sorry for the huge delay. I tried to compile your code but too many errors. |
2017-09-12 02:35:28 -0600 | commented answer | Trying to remove artefact with interpolation The clamping mechanism acts by limiting the high-pass component of the interpolation filter selectively to fix the under |
2017-09-08 07:35:51 -0600 | commented answer | Trying to remove artefact with interpolation Sorry I haven't much more information. It is very nice for trying to help me. I know another algorithm (noHalo, used in |
2017-09-08 03:47:11 -0600 | commented answer | Trying to remove artefact with interpolation I have no skills for writing my own interpolation algorithm. In fact I would like to write something like that: https:// |
2017-09-08 03:40:32 -0600 | commented answer | Trying to remove artefact with interpolation I have no skills for writing my own. In fact I would like something like that: https://pixinsight.com/doc/tools/StarAlig |
2017-09-06 09:27:03 -0600 | commented answer | Trying to remove artefact with interpolation Something wrong. For example the Median absolute deviation of the images you sent became 0. It is very strange. Some sig |
2017-09-06 09:00:52 -0600 | commented answer | Trying to remove artefact with interpolation And if you remove the super sampling you will see artifact. By the way if in the resize you also use Lanczoz you should |
2017-09-06 08:44:06 -0600 | commented answer | Trying to remove artefact with interpolation You're right. The thing I would like to do is playing with a parameter to adjust this effect. |
2017-09-04 08:03:07 -0600 | commented answer | Trying to remove artefact with interpolation Hummmm. there's something wrong in the dynamic of the image you sent me I can't explain. |
2017-09-03 14:09:27 -0600 | commented answer | Trying to remove artefact with interpolation Yes you're right, but I'm using cfitsio library in C. When you have BITPIX = 16, BSCALE = 1 and BZERO = 32768, you can l |
2017-09-03 14:07:42 -0600 | commented answer | Trying to remove artefact with interpolation Yes you're right, but I'm using cfitsio library in C. When you have BITPIX = 16, BSCALE = 1 and BZERO = 32768, you can l |
2017-09-03 11:23:01 -0600 | commented answer | Trying to remove artefact with interpolation In fact: #define USHORT_IMG 20 /* 16-bit unsigned integers, equivalent to / / BITPIX = 16 |
2017-09-02 17:14:20 -0600 | commented answer | Trying to remove artefact with interpolation The only difference I see is that you work with short data (CV_16SC1), not ushort. What if you use ushort ? |
2017-09-01 15:04:13 -0600 | commented question | Trying to remove artefact with interpolation Homography Matrix: -0.99974 -0.00299 +4002.14396, +0.00239 -0.99964 +2673.06210, -0.00000 -0.00000 |
2017-09-01 15:03:13 -0600 | commented question | Trying to remove artefact with interpolation The image is here: https://www.dropbox.com/s/gmb182d6u5nxduy/pp_sel_00000.fit?dl=0. I use the following function: warpPe |
2017-09-01 15:02:44 -0600 | commented question | Trying to remove artefact with interpolation The image is here: https://www.dropbox.com/s/gmb182d6u5nxduy/pp_sel_00000.fit?dl=0. I use the following function: warpPe |
2017-09-01 08:56:34 -0600 | commented question | Trying to remove artefact with interpolation The problem is that on linear images, typical undershoot artifacts are composed of one or a few very dark pixels around |
2017-09-01 08:48:09 -0600 | commented question | Trying to remove artefact with interpolation The problem is that on linear images, typical undershoot artifacts are composed of one or a few very dark pixels around |
2017-09-01 08:48:02 -0600 | commented question | Trying to remove artefact with interpolation The probleme is that on linear images, typical undershoot artifacts are composed of one or a few very dark pixels around |
2017-09-01 03:17:36 -0600 | commented question | Trying to remove artefact with interpolation Oh no. Sorry. Changes are not really visible. |
2017-09-01 03:14:40 -0600 | commented question | Trying to remove artefact with interpolation It looks like artifacts are almost gone like that !!! |
2017-09-01 02:47:09 -0600 | commented question | Trying to remove artefact with interpolation Yes and to convert back to 16U: out.convertTo(out, CV_16UC3, 65535.0); ? |
2017-09-01 02:26:22 -0600 | commented question | Trying to remove artefact with interpolation Could it be as simple that this solution ? Ok I have to find a way to convert data. Thank you. |
2017-09-01 02:10:31 -0600 | commented answer | Trying to remove artefact with interpolation The problem with using cubic in the warpPerspective call is that result is too blurred. |
2017-08-31 14:26:26 -0600 | edited question | Trying to remove artefact with interpolation Trying to remove artefact with interpolation Hello everyone, I'm posting here my question because I have some issues wit |
2017-08-31 04:21:34 -0600 | asked a question | Trying to remove artefact with interpolation Trying to remove artefact with interpolation Hello everyone, I'm posting here my question because I have some issues wit |
2017-08-31 00:21:33 -0600 | marked best answer | Apply quadratic function to an image Hello. I have a quadratic function I would like to apply to my image. The transformation has the following form:
For a linear transformation:
it was easy because I could use WarpAffine by putting the coefficients in a 3x2 matrix. Moreother, is it easy to get the value of rotation angle and scale ? Again, with the linear transformation, rotation angle is easily computed with atan2(B, C). Scale is (sqrt(BB + CC) and shifts are A and D. |
2017-08-29 04:20:50 -0600 | commented answer | Apply quadratic function to an image Oh gosh .... I have to find the the way to compute the inverse formula. Thank you. |
2017-08-28 15:16:44 -0600 | commented answer | Apply quadratic function to an image Thank you for your answers. But I'm afraid that is a too easy approach. Indeed, I think I would need interpolation algor |
2017-08-28 09:08:26 -0600 | asked a question | Apply quadratic function to an image Apply quadratic function to an image Hello. I have a quadratic function I would like to apply to my image. The transfor |
2017-08-25 09:26:38 -0600 | commented answer | What's the best way to use findHomography I could yes. But not very often |
2017-08-25 08:21:05 -0600 | commented answer | What's the best way to use findHomography Yes I do have rotation, and sometimes distorsions. So I guess the solution is to use triangle (at least) similarity algorithm before giving list to findHomography. |
2017-08-25 08:09:37 -0600 | commented answer | What's the best way to use findHomography @LBerger In fact I search stars in reference image, then I search stars in the second image. I have two lists. I sort these lists by brightness of stars. But, of course, the order in the two lists can change a bit. Then a stars can be detected in an image while not in the other, etc .... So I want to compare the n reference stars to the other and compute the homography matrix in order to apply the transformation matrix to the second image. At the end, you can stack both. |
2017-08-25 07:55:11 -0600 | commented answer | What's the best way to use findHomography C++ version has also double ransacReprojThreshold as parameter. By default this is 3. I've already tested with 1 or 0.1 with no sucess. So your last sentence means that ordering points is necessary ? So for now I do not know how I can do and my question is: if I order the 10 best points for example, what is the use of RANSAC algorithm ??? There will be no outliers. |
2017-08-25 07:35:06 -0600 | commented answer | What's the best way to use findHomography These keypoints are stars in astronomical images. So I use my own algorithm. It is working well as I can circle all detected stars. |