Opencv存图读图
【摘要】
目录
一,存储图像
1,存储 imwrite
2,编码格式
3,图片位深
二,读取图像
1,读取 imread
2,读取类型 ImreadModes
一,存储图像
1,存储 imwrite
imwrite("D:/im2.jpg", image2);
第三个参数缺省了。
2,编码格式
jpg是有损压缩,png...
目录
一,存储图像
1,存储 imwrite
imwrite("D:/im2.jpg", image2);
第三个参数缺省了。
2,编码格式
jpg是有损压缩,png是无损压缩,如果对图片要求很高的,还是用png好一点。
3,图片位深
32F类型的图片,像这样存下来之后会变成8U的,读取之后也是8U的,
即使再转换成32F的,也可能和原图有差异。
二,读取图像
1,读取 imread
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string path = "D:/im2.jpg";
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Mat image = imread(path, IMREAD_UNCHANGED);
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if (!image.data) {
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cout << "imread fail\n";
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return;
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}
第二个参数是ImreadModes类型的枚举,表示读取的通道数
返回的是一个Mat类型的对象。
成员data是uchar的指针,如果读取失败那么指针为空
2,读取类型 ImreadModes
ImreadModes的源代码:
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enum ImreadModes {
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IMREAD_UNCHANGED = -1, //!< If set, return the loaded image as is (with alpha channel, otherwise it gets cropped). Ignore EXIF orientation.
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IMREAD_GRAYSCALE = 0, //!< If set, always convert image to the single channel grayscale image (codec internal conversion).
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IMREAD_COLOR = 1, //!< If set, always convert image to the 3 channel BGR color image.
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IMREAD_ANYDEPTH = 2, //!< If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.
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IMREAD_ANYCOLOR = 4, //!< If set, the image is read in any possible color format.
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IMREAD_LOAD_GDAL = 8, //!< If set, use the gdal driver for loading the image.
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IMREAD_REDUCED_GRAYSCALE_2 = 16, //!< If set, always convert image to the single channel grayscale image and the image size reduced 1/2.
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IMREAD_REDUCED_COLOR_2 = 17, //!< If set, always convert image to the 3 channel BGR color image and the image size reduced 1/2.
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IMREAD_REDUCED_GRAYSCALE_4 = 32, //!< If set, always convert image to the single channel grayscale image and the image size reduced 1/4.
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IMREAD_REDUCED_COLOR_4 = 33, //!< If set, always convert image to the 3 channel BGR color image and the image size reduced 1/4.
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IMREAD_REDUCED_GRAYSCALE_8 = 64, //!< If set, always convert image to the single channel grayscale image and the image size reduced 1/8.
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IMREAD_REDUCED_COLOR_8 = 65, //!< If set, always convert image to the 3 channel BGR color image and the image size reduced 1/8.
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IMREAD_IGNORE_ORIENTATION = 128 //!< If set, do not rotate the image according to EXIF's orientation flag.
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};
-1 IMREAD_UNCHANGED 表示按照图片本身的通道数
0 IMREAD_GRAYSCALE 表示灰度图像,即单通道
1 IMREAD_COLOR 表示按照3通道
文章来源: blog.csdn.net,作者:csuzhucong,版权归原作者所有,如需转载,请联系作者。
原文链接:blog.csdn.net/nameofcsdn/article/details/122966084
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