Previous tutorial: Object detection using generalized Barad and Hough transforms Next tutorial: Affine transformation Original author Ana Huamán Compatibility OpenCV >= 3.0 Goals In this tutorial you will learn how to a. Use the OpenCV function cv::remap to implement a simple remapping routine. Theory What is remapping? It is the process of extracting pixels from […]
Tag: remap
mmap underlying driver implementation (remap_pfn_range function)
Mmap underlying driver implementation myfb.c (applied for 128K space) #include <linux/init.h> #include <linux/tty.h> #include <linux/device.h> #include <linux/export.h> #include <linux/types.h> #include <linux/module.h> #include <linux/export.h> #include <linux/mm_types.h> #include <linux/mm.h> #include <linux/slab.h> #define BUFF_SIZE (32 * 4 * 1024) static char *buff; static int major; static struct class * myfb_class; static int myfb_mmap (struct file *fp, struct vm_area_struct […]
5.2.17. Dynamic mapping operation LED request_mem_region and ioremap; iounmap unmapping and release_mem_region release the requested memory
5.2.17. Dynamic mapping operation LED 5.2.17.1. How to establish dynamic mapping (1) request_mem_region, Apply (report) to the kernel for memory resources that need to be mapped. (2) ioremap, is really used to realize the mapping, pass it the physical address, and he will map and return a virtual address for you 5.2.17.2. How to destroy […]
opencv-26 image geometric transformation 04- remapping-function cv2.remap()
What is remapping? Remapping is an operation in image processing that maps pixels in an image from one location to another. Remapping can achieve image translation, rotation, scaling and perspective transformation effects. It is a pixel-based image transformation technology that can change the geometry and appearance of an image by defining a mapping relationship. In […]
opencv remap pixel remapping
The input to the remap() function is a source image and a mapping matrix. The mapping matrix contains new coordinates for each pixel, specifying the position of each pixel in the output image. Suppose the coordinates of a pixel in the original image are ( x , the y ) (x,y) (x,y), its new coordinates […]
Output comparison (OC) calculation of three important parameters of PWM and port remapping, software simulation is attached at the end
IC(input Capture): input capture CC (Capture /Compare): input capture, output comparison unit The output comparison can set the output level to 1 and set to 0 by comparing the relationship between the CNT and CCR register values, and the inversion operation is used to output a duty ratio PWM waveform of a certain frequency. Advanced […]
GD32 serial port remapping problem
Title GD32 serial port remapping problem 1. Remapping port description The following is the USART remap description of GD32F205 2. Code implementation The AF clock must be turned on to use the remapping function, as follows rcu_periph_clock_enable(RCU_AF); The following is the USART1 remap code gpio_pin_remap_config(GPIO_USART1_REMAP, ENABLE); 3. Precautions Only USART0, USART1, and USART2 call the […]
[Solved] ValueError: operands could not be broadcast together with remapped shapes Solution
I encountered this problem when re-engraving Mask R-CNN to train my own data set for testing. The test code was modified on the basis of other people’s code. At first, I thought that the dimension did not correspond well. After careful inspection, I found that there was no problem. So the problem is transferred to […]