function img_gray=imgray(img,a) if size(img,3) == 3什么意思
时间: 2024-06-02 15:08:48 浏览: 17
这段代码首先定义了一个函数`imgray`,传入参数为`img`和`a`。其中`img`是一个图像,`a`是一个可选的参数,用来指定灰度化的方式。函数的返回值是一个灰度化后的图像`img_gray`。
`if size(img,3) == 3`是条件语句,判断图像`img`的第三个维度是否为3,即判断图像是否为彩色图像。如果是彩色图像(第三个维度为3),则执行下面的代码块,否则不执行。
相关问题
img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
This code converts a color image (img) into a grayscale image (img_gray) using the OpenCV function cv2.cvtColor(). The function takes two arguments: the input image (img) and the color conversion code (cv2.COLOR_BGR2GRAY) that specifies the type of conversion to be applied. In this case, the code converts the image from the BGR color space (which is the default color space used by OpenCV) to the grayscale color space. The resulting image (img_gray) will have only one channel (i.e., a single intensity value per pixel) instead of three channels (i.e., red, green, and blue intensities per pixel) in the original image.
img = imread('image.jpg'); img_gray = rgb2gray(img); [m, n] = size(img_gray); mask = ones(3, 3) / 9;
filtered_image = conv2(double(img_gray), mask, 'same');
This code snippet reads in an image "image.jpg", converts it to grayscale, and then creates a 3x3 averaging mask. The conv2 function is then used to convolve the image with the mask to perform a 2D spatial filtering operation, resulting in a filtered_image. The 'same' argument in the conv2 function ensures that the output image is the same size as the input image.
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