Affine transform in PIL Python

I have problems with the im.transform method in PIL python library. I thought I figured out the logic of parameters, A to F, however, the resulting image gets rotated in the wrong direction and...

Given two points and two vectors, find point of intersection

Possible Duplicate: How do you detect where two line segments intersect? Given two points a and b plus two vectors v and u I want to find a third point c, which is the point of intersection in...

Rotate image and crop out black borders

My application: I am trying to rotate an image (using OpenCV and Python) At the moment I have developed the below code which rotates an input image, padding it with black borders, giving me A....

Is it possible to directly apply an affine transformation matrix to a Mayavi ImageActor object?

I'm using Mayavi to render some imaging data that consists of multiple 2D planes within a 3D volume, the position, orientation, and scale of which are defined by 4x4 rigid body affine...

Given Three Points Compute Affine Transformation

I have two images and found three similar 2D points using a sift. I need to compute the affine transformation between the images. Unfortunately, I missed lecture and the information out there is a...

Named Mutex with await

Hence I can't use thread-affine locks with async - how can I guard my resources when running multiple processes? For example I've two processes that use a Task below: public async Task<bool>...

Javascript fuzzy search that makes sense

I'm looking for a fuzzy search JavaScript library to filter an array. I've tried using fuzzyset.js and fuse.js, but the results are terrible (there are demos you can try on the linked...

iOS UIPanGestureRecognizer: adjust sensitivity?

My question: Is there a way to adjust the "sensitivity" of UIPanGestureRecognizer so that it turns on 'sooner', i.e. after moving a fewer number of 'pixels'? I have a simple app with a...

How to do transforms on a CALayer?

Before writing this question, I've had experience with Affine transforms for views read the Transforms documentation in the Quartz 2D Programming Guide seen this detailed CALayer...

Data augmentation techniques for general datasets?

I am working in a machine learning problem and want to build neural network based classifiers on it in matlab. One problem is that the data is given in the form of features and number of samples...

Inverting a real-valued index grid

OpenCV's remap() uses a real-valued index grid to sample a grid of values from an image using bilinear interpolation, and returns the grid of samples as a new image. To be precise, let: A = an...

Reference to non-existent field handles matlab

function pushbutton1_Callback(hObject, eventdata, handles) % hObject handle to pushbutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure...

Rotate Image in Affine Transformation

I am having trouble correctly rotating an image in an affine transformation. Currently the below below is what i'm using: rotation_matrix = np.array([[np.cos(rotation_angle), ...

How to modify orientation of mgh/dicom/nifti file using nibabel

I have a hard time, figuring out a proper affine transformation for 3 different views i.e. coronal, axial and saggital, each having separate issues like below: 1: Axial color map get overlapped...

Affine Transform in TensorFlow 2.0

How to code Affine Transform in TensorFlow 2.0 that can work for digital images? I've tried tf.keras.preprocessing.image.apply_affine_transform from TensorFlow 1.14 but TensorFlow 2.0 has no such...

Mapping sets of points with affine transformation

There are 2 sets of points: The points are in separate pandas dataframes (python 3), stored as the points in rows and the values of the x and y positions in columns: Centroid X µm Centroid Y...

OpenCV copy irregular contour region to another image after contour rotation

I am working with an image with distorted/rotated texts. I need to rotate these text blobs back to the horizontal level (0 degrees) before I can run OCR on them. I managed to fix the rotation...

Bounding hyperparameter optimization with Tensorflow bijector chain in GPflow 2.0

While doing GP regression in GPflow 2.0, I want to set hard bounds on lengthscale (i.e. limiting lengthscale optimization range). Following this thread...

Extracting Intermediate layer outputs of a CNN in PyTorch

I am using a Resnet18 model. ResNet( (conv1): Conv2d(3, 64, kernel_size=(7, 7), stride=(2, 2), padding=(3, 3), bias=False) (bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True,...

How to strip a pretrained network and add some layers to it using pytorch lightning?

I am trying to use transfer learning for an image segmentation task, and my plan is to use the first few layers of a pretrained model (VGG16 for example) as an encoder and then will add my own...

Why don't I have to declare that x is reusable/duplicable with affine semantics and function types?

I was told that Rust has a semantics in affine logic -- so one has deletion/weakening but not duplication/contraction. The following compiles: fn throw_away<A, B>(x: A, _y: B) -> A { ...

Image Warping with a Polynomial Transformation

Outline I'm trying to warp an image (of a spectral peak in a time series, but this is not important) by generating a polynomial based on some 'centroid' data that is associated with the image (the...

Train a custom Mask RCNN with different image sizes in Google Colab. Unfortunately i can't get it running

currently I'm trying to train a Matterport Mask R-CNN with custom classes and a custom dataset on Colab. I followed this tutorial:...

What is the correct way to reproject a raster from a CRS to another using Python?

I have a raster of Land Cover data (specifically this one /eodata/auxdata/S2GLC/2017/S2GLC_T32TMS_2017 in https://finder.creodias.eu) that uses 'epsg:32632' as CRS. I want to reproject this raster...

The cause of uncontrolled camera movement in a mode 7 affine transformation?

I am trying to implement a mode 7 effect with C and SDL2. Eventually, I hope to be able to do cool effects, like change the height and field of view. But for now, I just want to get something...

remove black dashed lines from image stitching

I am stitching multiple images. While stitching two images it is showing dashed black line in between stitching like below. Has anyone knows about this how I can remove or get rid of this black...

Reading .h5 file is extremely slow

My data is stored in .h5 format. I use a data generator to fit the model and it is extremely slow. A snippet of my code is provided below. def open_data_file(filename, readwrite="r"): return...

Get "absolute" CSS transformation matrix

I am implementing a set of custom elements that will be used like this: <om-root> ... <om-node id="node1"> ... <om-node id="node2"> ... </om-node> ... </om-node> ...

how make panoramic view of serie of pictures using python, opencv, orb descriptors and ransac from opencv

i need to make a panoramic view from serie of pictures (3 pictures). After that i created orb, detected and computed keypoints and descriptors for the three picture, i matched the most likely...

How to bend / crook a Flutter widget? (non-affine widget render transform)

Let's say you have some flutter widget, for example, a TabBar. It is rendered in a rectangular box. I need it to be rendered in an arc so that the text and the underline follow part of a circle...