[英]How to resize output images in python?
嗨,我在python中运行此blurdetection代码(来源: https ://www.pyimagesearch.com/2015/09/07/blur-detection-with-opencv/)
# import the necessary packages
from imutils import paths
import argparse
import cv2
def variance_of_laplacian(image):
# compute the Laplacian of the image and then return the focus
# measure, which is simply the variance of the Laplacian
return cv2.Laplacian(image, cv2.CV_64F).var()
# loop over the input images
for imagePath in paths.list_images("images/"):
# load the image, convert it to grayscale, and compute the
# focus measure of the image using the Variance of Laplacian
# method
image = cv2.imread(imagePath)
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
fm = variance_of_laplacian(gray)
text = "Not Blurry"
# if the focus measure is less than the supplied threshold,
# then the image should be considered "blurry"
if fm < 100:
text = "Blurry"
# show the image
cv2.putText(image, "{}: {:.2f}".format(text, fm), (10, 30),
cv2.FONT_HERSHEY_SIMPLEX, 0.8, (0, 0, 255), 3)
cv2.imshow("Image", image)
print("{}: {:.2f}".format(text, fm))
key = cv2.waitKey(0)
2173 x 3161输入文件输入图像
这是输出显示输出图像图像正在放大并且没有显示完整。
在源代码中,他们使用450 x 600 px的输入图像: 源代码中的输入 ,这是输出: 源代码中的输出
我认为图像的像素会影响输出。 那么,如何获得与所有图像一样的输出,如源代码中的输出? 我是否需要调整输入图像的大小? 如何? 但如果我这样做,恐怕会影响他模糊的结果
摘录自文档 。
在一种特殊情况下,您已经可以创建一个窗口并稍后将图像加载到该窗口。 在这种情况下,您可以指定窗口是否可调整大小。 这是通过函数cv2.namedWindow()完成的。 默认情况下,该标志为cv2.WINDOW_AUTOSIZE 。 但是,如果将flag指定为cv2.WINDOW_NORMAL ,则可以调整窗口大小。 当图像尺寸过大并将跟踪栏添加到窗口时,这将很有帮助。
我只使用了放置在问题中的代码,但是添加了cv2.namedWindow("Image", cv2.WINDOW_NORMAL)
如注释中所述。
# import the necessary packages
from imutils import paths
import argparse
import cv2
def variance_of_laplacian(image):
# compute the Laplacian of the image and then return the focus
# measure, which is simply the variance of the Laplacian
return cv2.Laplacian(image, cv2.CV_64F).var()
# loop over the input images
for imagePath in paths.list_images("images/"):
# load the image, convert it to grayscale, and compute the
# focus measure of the image using the Variance of Laplacian
# method
image = cv2.imread(imagePath)
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
fm = variance_of_laplacian(gray)
text = "Not Blurry"
# if the focus measure is less than the supplied threshold,
# then the image should be considered "blurry"
if fm < 100:
text = "Blurry"
# show the image
cv2.putText(image, "{}: {:.2f}".format(text, fm), (10, 30),
cv2.FONT_HERSHEY_SIMPLEX, 0.8, (0, 0, 255), 3)
cv2.namedWindow("Image", cv2.WINDOW_NORMAL) #---- Added THIS line
cv2.imshow("Image", image)
print("{}: {:.2f}".format(text, fm))
key = cv2.waitKey(0)
如果您想使用与示例相同的分辨率,则可以使用cv2.resize()
https://docs.opencv.org/2.4/modules/imgproc/doc/geometric_transformations.html#调整大小方法或(如果要保持x / y坐标的比例)使用https://www.pyimagesearch.com/2015/02/02/just-open-sourced-personal-imutils中提供的imutils类-package-系列-opencv便利功能/
您仍然必须决定是否要先进行大小调整。 灰度或调整大小顺序无关紧要。
您可以添加的命令: resized_image = cv2.resize(image, (450, 600))
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