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Read an Image in OpenCV ( Python, C++ )

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原文鏈接： https://www.learnopencv.com/read-an-image-in-opencv-python-cpp/

In OpenCV you can easily read in images with different file formats (JPG, PNG, TIFF etc.) using? imread . The basic usage is shown below

C++

?

Mat imread( const string& filename, int flags=IMREAD_COLOR )

Python

?

image = cv2.imread(filename, flags = cv2.IMREAD_COLOR)

The? flags ?option is used to control how the image is read. Let’s look at some common examples. In all the examples below, make sure you use the right namespace for C++ and import OpenCV for Python.
C++

?

using namespace cv;

Python

?

import cv2

Read as 8-bit / channel Color Image ( without Alpha Channel)

A vast majority of images are 8-bit per channel ( or 24-bit ) images. They can be read using default flags.

C++

?

Mat image = imread( "image.jpg" );

Python

?

image = cv2.imread( "image.jpg" )

Read as 8-bit Grayscale Image

C++

?

Mat image = imread( "image.jpg" , IMREAD_GRAYSCALE);

Python

?

image = cv2.imread( "image.jpg" , cv2.IMREAD_GRAYSCALE)

Read 16-bit / channel Color Image

Most digital SLR cameras are capable of recording images at a higher bit depth than 8-bits / channel. The raw images from these cameras can be converted to 16-bit / channel PNG or TIFF images. These 16-bit / channel images can be read using
C++

?

Mat image = imread( "image.png" , IMREAD_ANYCOLOR | IMREAD_ANYDEPTH);

Python

?

im = cv2.imread( "image.png" , cv2.IMREAD_ANYCOLOR | cv2.IMREAD_ANYDEPTH)

You may also use the flag IMREAD_UNCHANGED instead. See an example below.

Read a Transparent PNG or TIFF in OpenCV

A transparent image has four channels — 3 for color, and one for transparency. These images can be read in OpenCV using the IMREAD_UNCHANGED flag.
C++

?

Mat image = imread( "image.png" , IMREAD_UNCHANGED);

Python

?

im = cv2.imread( "image.png" , cv2.IMREAD_UNCHANGED)

NOTE :? CV_LOAD_IMAGE_COLOR, CV_LOAD_IMAGE_GRAYSCALE, CV_LOAD_IMAGE_ANYCOLOR, CV_LOAD_IMAGE_ANYDEPTH, and CV_LOAD_IMAGE_UNCHANGED will be removed in future versions of OpenCV.


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