Comments (5)
https://docs.opencv.org/3.1.0/d3/d63/classcv_1_1Mat.html#a5fafc033e089143062fd31015b5d0f40
Pointer to the user data. Matrix constructors that take data and step parameters do not allocate matrix data. Instead, they just initialize the matrix header that points to the specified data, which means that no data is copied. This operation is very efficient and can be used to process external data using OpenCV functions. The external data is not automatically deallocated, so you should take care of it.
from matft.
Matft/Sources/Matft/library/vDSP.swift
Line 1415 in 7bd5406
bitspercomponent
= 32 means float?
If so, this is more efficient
According to core graphics supposed pixel formats, it only supports RGB with float format on iOS not Gray on iOS
ref: CGContext
from matft.
I think CGContext documents implies passing data pointer will not be freed (= not copied )
data: A pointer to the destination in memory where the drawing is to be rendered. The size of this memory block should be at least (bytesPerRow*height) bytes.
Pass NULL if you want this function to allocate memory for the bitmap. This frees you from managing your own memory, which reduces memory leak issues.
from matft.
Ref: Float CGContext
https://stackoverflow.com/questions/55433107/how-to-normalize-pixel-values-of-an-uiimage-in-swift
from matft.
The difference between Planar and interleaved image link
Planar: Column contiguous
Interleaved: Row contiguous
https://developer.apple.com/documentation/accelerate/optimizing_image-processing_performance
from matft.
Related Issues (20)
- Boolean Indexing is slow HOT 10
- Other Cubic spline Interpolation
- not found np.unique() HOT 1
- Wrong Shape after "ufuncReduce add" HOT 5
- Matft.math.pow is not working as expected HOT 1
- Add @inline
- Complex support HOT 9
- Refactoring pointer HOT 3
- Adding demo for image processing HOT 3
- Support for atan2 HOT 3
- Feature Request: Numpy Dot HOT 1
- Multidimensional MfArray with different length Arrays in axis 1 HOT 2
- Copy On Write implementation HOT 2
- Subscript bug using `Matft.arange()` HOT 4
- Numpy FFT implementation? HOT 11
- Support MLMultiArray HOT 1
- [Bug] Invalid access on some complex operation
- How to contribute - have some small numpy / scipy vDSP implementations HOT 1
- How to get the content of the MfArray? HOT 3
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from matft.