Question

我知道我们可以设置所有像素值，并访问每个像素来设置值。假设我已经有一组像素，其值只有，我想设置为255.这是否可能，在opencv？有功能可以做到吗？对不起，如果这个问题很简单

Answer 1

查看setTo函数，该函数允许设置一些蒙版mat元素的值：

 from sys import *

tokens = []

def open_file(filename):
    data = open(filename, "r").read()
    data += "<EOF>"
    return data

def lex(filecontents):
    tok = ""
    state = 0
    isexpr = 0
    string = ""
    expr = ""
    n = ""
    filecontents = list(filecontents)
    for char in filecontents:
        tok += char
        if tok == " ":
            if state == 0:
                tok = ""
            else:
                tok = " "
        elif tok == "\n" or tok == "<EOF>":
            if expr != "" and isexpr == 1:
                #print(expr + "EXPR")
                tokens.append("EXPR:" + expr)
                expr = ""
            elif expr != "" and isexpr == 0:
                #print(expr + "NUM")
                tokens.append("NUM:" + expr)
                expr = ""
            tok = ""
        elif tok.lower() == "print":
            tokens.append("PRINT")
            tok = ""
        elif tok.isnumeric():
            expr += tok
            tok = ""
        elif tok == "+":
            isexpr = 1
            expr += tok
            tok = ""
        elif tok == "\"":
            if state == 0:
                state = 1
            elif state == 1:
                tokens.append("STRING:" + string + "\"")
                string = ""
                state = 0
                tok = ""
        elif state == 1:
            string += tok
            tok = ""
    print(tokens)
    return tokens

def parse(toks):
    i = 0
    while(i < len(toks)):
        if toks[i] + " " + toks[i+1][0:6] == "PRINT STRING" or toks[i] + " " + toks[i+1][0:3] == "PRINT NUM" or toks[i] + " " + toks[i+1][0:4] == "PRINT EXPR":
            if toks[i+1][0:6] == "STRING":
                print(toks[i+1][7:])
            elif toks[i+1][0:3] == "NUM":
                print(toks[i+1][4:])
            elif toks[i+1][0:4] == "EXPR":
                print(toks[i+1][5:])
            i+=2

def run():
    data = open_file(argv[1])
    toks = lex(data)
    parse(toks)

run()

设置Mat，opencv的特定像素值

1 个答案: