cvSaveImage用法

最新推荐文章于 2021-02-23 06:52:28 发布

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本文详细介绍了cvSaveImage函数的使用方法及其参数设置，包括如何指定不同的图像格式和质量参数来保存图片。

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cvSaveImage用法

int cvSaveImage	(
const char * 	filename, 	// 文件名称
const CvArr * 	image,		// 保存图像
const int * 	params = 0 	// 保存格式参数
)

CVAPI(int) cvSaveImage(
const char* filename,const CvArr* image,

const int* params CV_DEFAULT(0) );

其中保存格式参数取值范围如下：

enum
{
    CV_IMWRITE_JPEG_QUALITY =1,
    CV_IMWRITE_JPEG_PROGRESSIVE =2,
    CV_IMWRITE_JPEG_OPTIMIZE =3,
    CV_IMWRITE_JPEG_RST_INTERVAL =4,
    CV_IMWRITE_JPEG_LUMA_QUALITY =5,
    CV_IMWRITE_JPEG_CHROMA_QUALITY =6,
    CV_IMWRITE_PNG_COMPRESSION =16,
    CV_IMWRITE_PNG_STRATEGY =17,
    CV_IMWRITE_PNG_BILEVEL =18,
    CV_IMWRITE_PNG_STRATEGY_DEFAULT =0,
    CV_IMWRITE_PNG_STRATEGY_FILTERED =1,
    CV_IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY =2,
    CV_IMWRITE_PNG_STRATEGY_RLE =3,
    CV_IMWRITE_PNG_STRATEGY_FIXED =4,
    CV_IMWRITE_PXM_BINARY =32,
    CV_IMWRITE_WEBP_QUALITY =64,
    CV_IMWRITE_PAM_TUPLETYPE = 128,
    CV_IMWRITE_PAM_FORMAT_NULL = 0,
    CV_IMWRITE_PAM_FORMAT_BLACKANDWHITE = 1,
    CV_IMWRITE_PAM_FORMAT_GRAYSCALE = 2,
    CV_IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA = 3,
    CV_IMWRITE_PAM_FORMAT_RGB = 4,
    CV_IMWRITE_PAM_FORMAT_RGB_ALPHA = 5,
};

例程如下：

// 设置保存格式
INT lv_nParamsArray[3];
memset(lv_nParamsArray, 0, sizeof(lv_nParamsArray));
// JPG压缩格式
lv_nParamsArray[0] = CV_IMWRITE_JPEG_QUALITY;
lv_nParamsArray[1] = 100;		// 无压缩存图
lv_nParamsArray[2] = 0;
// 保存图像
cvSaveImage(lv_strFileName, m_IplImageNow, lv_nParamsArray);