Stack Overflow
Stack Overflow

Questions tagged [bilinear-interpolation]

89 questions
0
votes
1 answer

Why Do Standard Image Resampling Techniques limit the number of sampled pixels?

I'm referring mainly to Bilinear and Bicubic resampling techniques. Both of these methods involve sampling 4 and 16 pixels respectively, the former being the 2x2 of pixels closest to the new pixel, and the latter being the 4x4 closest to it. Why do…
J. Doe
  • 127
  • 9
0
votes
1 answer

Running C Bilinear Interpolation

I came across this, the C version of Bilinear interpolation. I can't figure out how to run it. I have an image called image_1.jpeg that I want to use... It looks you just need to call scale(), but how exactly do you write the main() method to do…
user5494880
0
votes
0 answers

How can I make an array of data from an arbitrary vector over 2d gridded data?

I have a gridded data set of latitude longitude and overtop of each of those points I have a temperature creating a contour map. Over top of this gridded data set I have multiple vectors that point in different directions over this contour map. What…
Sarah Dodamead
  • 1
0
votes
1 answer

Bilinear interpolation using multiprocessing and sharedmem

I wanted to perform bilinear interpolation on a very large image(>20Mb). The conventional code takes very long time. I tried making it multiprocessing but in the results, only the last column of pixels seems to appear. Sorry if this is a noob…
Chinchan4
  • 1
  • 2
0
votes
0 answers

Code optimization of Bilinear interpolation

I have implemented bilinear interpolation algorithm according to the MATLAB example: https://se.mathworks.com/matlabcentral/fileexchange/10772-fast-2-dimensional-interpolation; https://en.wikipedia.org/wiki/Bilinear_interpolation - Unit square…
AndriusS
  • 35
  • 1
0
votes
1 answer

Interpolate pixel rectangle that are out of image in OpenCV

I am recently reading the code of cv::getRectSubPix in OpenCV, which involves dealing rectangles out of image. Concretely, I am stuck on function adjustRect that is used to reshape the out-of-bounds rectangular window. According to the code of…
Finley
  • 795
  • 1
  • 8
  • 26
0
votes
0 answers

Rotation using Bilinear Interpolation Backward Mapping Calculation?

I just started learning Image processing. Could someone help me explain this Step3 how to calculate these column? i really don't understand it. So please explain it simply as possible. Rotation formula -> forward and backward mapping Flowchart…
Mafiaz
  • 1
  • 1
0
votes
1 answer

Bilinear interpolation for irregular grid to fill data gaps

I would like to perform a bilinear interpolation for a irregular grid of height data. The sketch roughly shows my grid an some example x,y pairs.I only have the beige data points and want to interpolate everything in between. Interpolation My y's…
Aldi Kasse 2
  • 143
  • 1
  • 13
0
votes
1 answer

Does FFMPEG apply a blur filter after scaling?

So I am implementing my own version of bilinear scaling and comparing results with FFMPEG and ImageMagick. These tools create a scaled version of my image but it seems the results are not obtained only by applying the interpolation operations, it…
Pedro Pereira
  • 312
  • 5
  • 21
0
votes
1 answer

Indirect bilinear interpolation from a table

Reference Table I want to interpolate values two voltage signals using this table and convert them into corresponding temperature values. It isn't a direct bilinear interpolation I want to perform. for example: T1: 1.721 V T2: 4.025 V Step 1:…
hegdep
  • 596
  • 1
  • 6
  • 16
0
votes
1 answer

Bilinear interpolation in Swift

I am currently working on implementing spectrogram and the input to it are output from FFT. The results which I am getting is very pixelated. To make the output more smooth, I need to implement bilinear interpolation. Is there any library or API…
Chui
  • 3
  • 1
  • 4
0
votes
2 answers

Faster Method for Multiple Bilinear Interpolation?

I am writing a program in C++ to reconstruct a 3D object from a set of projected 2D images, the most computation-intensive part of which involves magnifying and shifting each image via bilinear interpolation. I currently have a pair of functions for…
KPM
  • 331
  • 1
  • 13
0
votes
0 answers

Deconvolution layer FCN initialization - loss drops too fast

I'm training a small (10M weights on 12K images) FCN (see e.g. Long et al, 2015). The architecture is the following (it starts with FCN8s fc7 layer):…
Alex
  • 944
  • 4
  • 15
  • 28
0
votes
1 answer

Bilinear Interpolation - OSRM Rastersource

I've got a question about bilinear interpolation in the OSRM-Project. I understand the "normal" bilinear interpolation. Here the picture from Wikipedia, what is insane: Now I'm trying to understand the bilinear interpolation which is used in the…
Daniel Christoph
  • 309
  • 3
  • 11
0
votes
1 answer

How to use bilinear interpolation on resizing image when enlarge the original image to n times, where n is not integer

I recently learnt bilinear interpolation, according to the description in Wiki, I feel that bilinear interpolation can only be used in integer-factored enlarging, for example, given 4x4 resolution image, by bilinear interpolation, it can only…
Feng Qinping
  • 39
  • 7
1 2 3 4
5
6