diff --git a/basic/views.py b/basic/views.py
index 75f30f4..e176604 100644
--- a/basic/views.py
+++ b/basic/views.py
@@ -965,6 +965,50 @@ def process_median_sort(img):
     return output
 
 
+def process_high_choice(img, limit):
+    output = np.zeros(img.shape, np.uint8)
+    for i in range(img.shape[0]):
+        for j in range(img.shape[1]):
+            if img[i][j] > limit:
+                output[i][j] = img[i][j]
+            else:
+                output[i][j] = 0
+    return output
+
+
+def process_low_choice(img, limit):
+    output = np.zeros(img.shape, np.uint8)
+    for i in range(img.shape[0]):
+        for j in range(img.shape[1]):
+            if img[i][j] < limit:
+                output[i][j] = img[i][j]
+            else:
+                output[i][j] = 0
+    return output
+
+
+def process_pass_choice(img, min, max):
+    output = np.zeros(img.shape, np.uint8)
+    for i in range(img.shape[0]):
+        for j in range(img.shape[1]):
+            if min < img[i][j] < max:
+                output[i][j] = img[i][j]
+            else:
+                output[i][j] = 255
+    return output
+
+
+def process_stop_choice(img, min, max):
+    output = np.zeros(img.shape, np.uint8)
+    for i in range(img.shape[0]):
+        for j in range(img.shape[1]):
+            if min < img[i][j] < max:
+                output[i][j] = 0
+            else:
+                output[i][j] = img[i][j]
+    return output
+
+
 @csrf_exempt
 def filtration(request):
     if request.method == 'POST':
@@ -987,6 +1031,21 @@ def filtration(request):
                 img = process_median_sort(img)
             elif detail_type == 'min':
                 img = process_min_sort(img)
+        elif op == 'choice':
+            if detail_type == 'low':
+                limit = para.get('limit', 20)
+                img = process_low_choice(img, limit)
+            elif detail_type == 'high':
+                limit = para.get('limit', 200)
+                img = process_high_choice(img, limit)
+            elif detail_type == 'pass':
+                min_r = para.get('min', 20)
+                max_r = para.get('max', 200)
+                img = process_pass_choice(img, min_r, max_r)
+            elif detail_type == 'stop':
+                min_r = para.get('min', 20)
+                max_r = para.get('max', 200)
+                img = process_stop_choice(img, min_r, max_r)
         filename = getImageName() + DEFAULT_FORMAT
         cv2.imwrite(PREFIX + filename, img)
         return HttpResponse(filename)