【opencv.js】访问单个像素
2021-03-18 22:23
标签：java ann open c++ target opencv mat arp canvas JavaScript 写法类似于 C++ 写法。 相关内容详细介绍请移步官网：【https://docs.opencv.org/3.3.1/de/d06/tutorial_js_basic_ops.html】 at 方法 ptr 方法 【opencv.js】访问单个像素 标签：java ann open c++ target opencv mat arp canvas 原文地址：https://www.cnblogs.com/bjxqmy/p/12764716.html
Mat Type
At Manipulation
CV_8U
ucharAt
CV_8S
charAt
CV_16U
ushortAt
CV_16S
shortAt
CV_32S
intAt
CV_32F
floatAt
CV_64F
doubleAt
//访问（3，4）位置上的像素
let row = 3, col = 4;
let src = cv.imread("canvasInput");
let R = src.ucharAt(row, col * src.channels());
let G = src.ucharAt(row, col * src.channels() + 1);
let B = src.ucharAt(row, col * src.channels() + 2);
let A = src.ucharAt(row, col * src.channels() + 3);
Mat Type
Ptr Manipulation
JavaScript Typed Array
CV_8U
ucharPtr
Uint8Array
CV_8S
charPtr
Int8Array
CV_16U
ushortPtr
Uint16Array
CV_16S
shortPtr
Int16Array
CV_32S
intPtr
Int32Array
CV_32F
floatPtr
Float32Array
CV_64F
doublePtr
Float64Array
//访问（3，4）位置上的像素
let row = 3, col = 4;
let src = cv.imread("canvasInput");
let pixel = src.ucharPtr(row, col);
let R = pixel[0];
let G = pixel[1];
let B = pixel[2];
let A = pixel[3];
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