实现BMP图像处理类 class BMPmanager,需要实现构造和析构,图像读入初始化 ,实现反色方法Inverse()(红绿反色) ,实现黑白化方法bw()(超过128为白色,低于128为黑色)
时间: 2024-03-22 13:42:39 浏览: 74
以下是一个简单的 BMP 图像处理类 `BMPmanager` 的实现,包括构造和析构、图像读入初始化、反色方法 `Inverse()` 和黑白化方法 `bw()`:
```c++
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
#pragma pack(push, 1)
struct BMPHeader {
char signature[2];
unsigned int fileSize;
unsigned short reserved1;
unsigned short reserved2;
unsigned int dataOffset;
};
struct DIBHeader {
unsigned int headerSize;
int width;
int height;
unsigned short colorPlaneCount;
unsigned short bitsPerPixel;
unsigned int compressionMethod;
unsigned int imageSize;
int horizontalResolution;
int verticalResolution;
unsigned int colorCount;
unsigned int importantColorCount;
};
#pragma pack(pop)
class BMPmanager {
public:
BMPmanager(const char* filename) {
file.open(filename, ios::in | ios::binary);
if (!file) {
cerr << "Could not open file: " << filename << endl;
return;
}
file.read(reinterpret_cast<char*>(&bmpHeader), sizeof(bmpHeader));
file.read(reinterpret_cast<char*>(&dibHeader), sizeof(dibHeader));
if (dibHeader.bitsPerPixel != 24) {
cerr << "Only 24-bit BMP files are supported." << endl;
return;
}
pixelData.resize(dibHeader.imageSize);
file.seekg(bmpHeader.dataOffset, ios::beg);
file.read(pixelData.data(), pixelData.size());
file.close();
}
~BMPmanager() {
// Do any necessary cleanup here...
}
void Inverse() {
for (int i = 0; i < pixelData.size(); i += 3) {
// Invert red and green components
pixelData[i] = 255 - pixelData[i];
pixelData[i+1] = 255 - pixelData[i+1];
// Leave blue component unchanged
}
}
void bw() {
for (int i = 0; i < pixelData.size(); i += 3) {
// Convert to grayscale
int gray = (pixelData[i] + pixelData[i+1] + pixelData[i+2]) / 3;
// Set all components to either black or white
if (gray > 128) {
pixelData[i] = 255;
pixelData[i+1] = 255;
pixelData[i+2] = 255;
} else {
pixelData[i] = 0;
pixelData[i+1] = 0;
pixelData[i+2] = 0;
}
}
}
private:
BMPHeader bmpHeader;
DIBHeader dibHeader;
vector<char> pixelData;
ifstream file;
};
int main() {
BMPmanager bmp("example.bmp");
if (!bmp.pixelData.empty()) {
bmp.Inverse();
bmp.bw();
// Do something with the modified pixel data here...
}
return 0;
}
```
该代码实现了一个简单的 BMP 图像处理类 `BMPmanager`,其中包含了构造和析构方法、图像读入初始化、反色方法 `Inverse()` 和黑白化方法 `bw()`。在 `main` 函数中,你可以创建 `BMPmanager` 对象,并使用它的方法对图像进行处理。注意,在使用 `BMPmanager` 对象之前,需要检查 `pixelData` 是否为空,以确保文件已经成功读入。
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