bitwise-not

问题 I am trying to apply mask on an image using opencv bitwise-not. I am able to achieve this result if I read both original and mask image in Greyscale mode, but it doesn't work on 3 channel images. I have read this thread OpenCV Python Error: error: (-215) (mtype == CV_8U || mtype == CV_8S) && _mask.sameSize(*psrc1) in function cv::binary_op but my problem isn't shapes of arrays or mask not being in uint8 format. import cv2 import numpy as np img = cv2.imread("Original.png") # original image,

问题 How do I write NOT Operation for the Risc-V (Assembly Language)? If there's no NOT instruction, how do you achieve the same thing? 回答1: Like MIPS and some other architectures, RISC V does not provide dedicated instructions for many things, including two-operand unary operations, as these operations can be had using their three-operand format, usually with x0 as the third operand, but sometimes constant 1 or -1 as the third operand. For convenience, the assembler will accept what are called

问题 How do I write NOT Operation for the Risc-V (Assembly Language)? If there's no NOT instruction, how do you achieve the same thing? 回答1: Like MIPS and some other architectures, RISC V does not provide dedicated instructions for many things, including two-operand unary operations, as these operations can be had using their three-operand format, usually with x0 as the third operand, but sometimes constant 1 or -1 as the third operand. For convenience, the assembler will accept what are called

问题 Why does (Not 1) evaluate as -2? I would expect it to evaluate as 0. 回答1: VBA/VBScript does not have real logical operators (AND, OR, NOT). The logical operators you see are actually bitwise operators, and that's all you get. VBA plays some games with the True and False values so this works most of the time, but occasionally you'll find a "gotcha". In this case, instead of If Not InStr() Then you have to write If InStr() <= 0 Then . Instead of If InStr() Then you have to write If InStr() > 0