Tag: dsa

Comparative analysis of napi_threadsafe_function and napi_async_work

Foreword From the perspective of usage and official introduction, napi_threadsafe_function and napi_async_work seem to be two completely different things, but from the source code analysis of their implementation principles, there is a great degree of overlap. Even the usage scenarios overlap. Before reading The specific usage and function of uv_async_send, uv_async_init, and uv_queue_work. The specific […]

Mobile Terminal [Android & iOS] Compression ECDSA PublicKey

Mobile version [Android & amp; iOS] Compressed ECDSA PublicKey Android iOS Use the security capabilities provided by Android KeyStore and iOS’s Secure Enclave to use P-256 to sign API requests and then verify them on the server side. However, it was found that neither iOS nor Android provides a convenient way to obtain the 33-bytes […]

GEE joint multi-source time series remote sensing data download: taking Landsat-8 and Sentinel-2 as examples (including identification and deletion of cloud-free abnormal images)

Directory 1. Significance of joint multi-source remote sensing images 1. Improving information quality 2. Rich data content 3. Reduce data noise 2. Implementation of GEE 1. Selection of research area and download year 2. Define the numerical conversion function 3. Define the image cloud removal function 4. Screen the Landsat-8 data needed for research Supplement: […]

[Java] ES256 (ECDSA256) algorithm generates Json Web Token (JWT) and verifies it

For detailed information about JWT, please refer to the official website: jwt.io. At the same time, you can quickly verify whether the JWT we generated is correct. Introducing JWT dependencies <dependency> <groupId>com.auth0</groupId> <artifactId>java-jwt</artifactId> <version>4.4.0</version> </dependency> Generate local key pair (public/private key) If it has been generated locally, skip this step. The generated key is only […]

[gridsample] How does the horizon support the gridsample operator?

Article directory 1. Function analysis of grid_sample operator 1.1 Theoretical introduction 1.2 Code Analysis 1.2.1 x,y value range [-1,1] 1.2.2 The value range of x and y exceeds [-1,1] 2. Use the grid_sample operator to build a network 3. Take PTQ for model conversion and compilation 4. Use QAT for model conversion and compilation The […]

From ECDSA to Schnorr to BLS

Introduction Rationale ECC is essentially implemented using the theoretical unsolvability of the discrete logarithm problem. That is, G is a point on EC, then knowing x*G, it is not feasible to solve x under the current computer architecture. Whether it is ECDSA, Schnorr or BLS, it is essentially to hide information by making the discrete […]

R: Use the STARFM algorithm to fuse MODIS and Landsat remote sensing images and perform Gaussian smoothing

Author: CSDN @ _Yakult_ This article will introduce the R language code that uses the STARFM (Spatial and Temporal Adaptive Reflectance Fusion Model) method to fuse MODIS (Moderate Resolution Imaging Spectroradiometer) and Landsat remote sensing images, and perform Gaussian smoothing processing. This code is used in conjunction with the Google Earth Engne (GEE) platform code. […]

Use Arcgis to register, crop and export landsat7 and landsat8

1. Install ArcGIS10.8 and configure the compiler in pycharm 1. Install ArcGIS, there are many tutorials on the Internet, you can search by yourself 2. Configure the compilation environment in pycharm (1) First, make sure that python2.7 has been installed when installing ArcGIS, and find the folder. My installation path is the default: C:\Python27\ArcGIS10.8 (2) […]

Interpretation of torch’s DistributedSampler

Usually used in conjunction with distributed DDP, it is used as the sampler of dataloader. As the name implies, the data collector determines which data the dataloder selects in the current batch. DistributedSampler is used to divide and sample the data set in distributed training Datasets are considered to be of constant size, and any […]