初步完成第四题

test/2024,9,23/homework.py

@@ -1,17 +1,32 @@
 import cv2 as cv
+import numpy as np
 
 # 1
 img=cv.imread("sample.jpg",cv.IMREAD_GRAYSCALE)
+img2=cv.imread('sample.jpg',cv.IMREAD_GRAYSCALE)
 # 2
 def draw_circle(event,x,y,flags,param):
     if event==cv.EVENT_LBUTTONDOWN:
         cv.circle(img,(x,y),10,0,-1)
-#3
-cv.namedWindow('modify_sample')
-cv.setMouseCallback('modify_sample',draw_circle)
 #4
 alpha=0.3
 beta=80
+def updateAlpha(x):
+    global alpha,img,img2
+    alpha=cv.getTrackbarPos('Alpha','image')
+    alpha=alpha*0.01
+    img=np.uint8(np.clip((alpha*img2+beta),0,255))
+def updateBeta(x):
+    global beta,img,img2
+    beta=cv.getTrackbarPos('Beta','image')
+    img=np.uint8(np.clip((alpha*img2+beta),0,255))
+#3
+cv.namedWindow('modify_sample')
+cv.createTrackbar('Alpha','image',0,300,updateAlpha)
+cv.createTrackbar('Beta','image',0,255,updateBeta)
+cv.setTrackbarPos('Alpha','image',100)
+cv.setTrackbarPos('Beta','image',10)
+cv.setMouseCallback('modify_sample',draw_circle)
 while(1):
     cv.imshow('modify_sample',img)
     pressedKey=cv.waitKey(5)