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Questions tagged [opencv]

OpenCV (Open Source Computer Vision Library) is an open source computer vision and machine learning software library.

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How do I convert Digital Number (DN) to reflectance in order to analyze NDVI

I'm working with a mapir nir + red camera meaning that its blue band captures nir light and its red captures red normally. I understand that NDVI is calculated using reflectance values. My question ...
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1answer
25 views

How do I visualize NDVI values?

Currently, I have the NDVI values, and I transformed it from [-1, 1] to [0, 255]. Now my question is how do I visualize either of these value? My first thought is to make a color map similar to the ...
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1answer
37 views

Importing cv2 on Python 2.7 gives error [closed]

When importing cv2 on Python 2.7 I got this error: Traceback (most recent call last): File "<pyshell#1>", line 1, in <module> import cv2 ImportError: DLL load failed: The specified ...
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582 views

Get information about current coordinates and rgb values in openCV window

I have started to learn OpenCV python library for remote sensing data processing. And when I open window by: cv2.imshow I can't know x,y coordinate and RGB values in current mouse position. How to ...
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39 views

Registration of stereo pairs?

I am trying to generate DSM and orthorectify the satellite images by myself without using any photogrammetry software. However, primary products are not aligned and I could not register them to ...
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1answer
125 views

Seeking Open Source implementation of Majority Filter?

I am performing postprocessing on Landsat GeoTIFF images and want to use the Majority Filter as mentioned in the book on Image Analysis, Classification and Change Detection in Remote Sensing and ...
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0answers
199 views

Raster alignment

I have a problem with raster aligning. Given: Two rasters that need to be aligned. Rasters a little bit shifted, scaled and rotated. Two arrays of matched keypoints. Transformation is wrong, so ...
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2answers
2k views

How to save numpy array as single band image?

I'm working on MODIS NDVI composite data (single band). I converted the image to a numpy array and performed filtering operations. When i'm saving the new numpy array as an image I get a 3 band image ...
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0answers
380 views

How to loop the kernel for covering all pixels from a raster in 5x5 convolution window by using OpenCV? [closed]

Here, I have python code which is helping me in selecting 5 by 5 window from upper left corner of a raster (.tif). I want a process to automate through entire image in 5 by 5 convolution window. ...
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0answers
219 views

reading 13 bands (Sentinel 2A) .tif image in cv::Mat (opencv C++)

I want to read 13 bands of a .tif image in separate cv::Mat objects for processing. I have tried reading it with opencv imread() function but it fails to load it. Also, I have used libtiff but I am ...
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2answers
1k views

Detecting overlapping blobs in image?

I have read the following two posts related to my question; however, my problem is slightly different and I'm having a hard time solving it. Finding if two polygons Intersect in python? Getting ...
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1answer
704 views

GDAL, python: How to create a GDAL dataset object from a numpy array

I am working on a program that uses both OpenCV and GDAL to perform different tasks. OpenCV stores its images as numpy arrays. I would like to be able to go directly from this numpy array to a dataset ...