我正在尝试缩放图像,我的问题如下: 我真的不知道该如何实现循环以读取原始图像中的所有像素,然后在我的新数组中平均放置4个像素(在这种情况下为原始图像的75%)...第一次在这里发布我,希望我的话题得到很好的建议。
import numpy as np
import cv2
def averageScale(img, scaleSize, swSize):# Space and Radiometric Scale; swSize is the sliding window nxn where ill place the 4 pixels
#loop parameters
w, h = img.shape
lb_i = int((swSize/2))
lb_j = lb_i
ub_i = w - lb_i
ub_j = h - lb_j
#Image processing items
newImage = np.zeros((scaleSize[1], scaleSize[0]), np.float)# H x W
#print(newImage.shape)
for i in range(lb_i, ub_i, 2):
for j in range(lb_j, ub_j, 2):
pixel = mean4Pixels(img, i-lb_i, j-lb_j, swSize)
newImage[int(i/2)][int(j/2)] = pixel
return newImage
def mean4Pixels(img, index1, index2, swSize):
slidingWindow = np.zeros((swfSize, swSize), np.float)# NxN window
for i in range(0, swSize):
for j in range(0, swSize):
slidingWindow[i][j] = img[index1+i][index2+j]
averageResult = sum(slidingWindow.sum(axis=0))/(swSize*2)
return averageResult`
img = np.uint8(cv2.imread("./images/imageScaling/coverMagazine.jpg"))
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
w, h, d = img.shape
scaleSize = np.array((w*(3/4),h*(3/4)), np.uint8)
scaleSize = tuple(scaleSize)
scaledImg = averageScale(img[:,:,0], scaleSize, 2)