如何从 python 中的逻辑语句中避免此弃用警告？

Question

我正在使用 Basler 相机开发 4 的 GUI。在我的程序中，我面临两个导致 GUI 无法正确运行的问题。然而，主要目标是根据相机索引保存 4 张图像。我被告知要使用多线程技术来开发GUI，这些就是我遇到的问题。这些是代码：

def LiveThread(strIdx):
        CamIdx = int(strIdx)

        try:
            panel[CamIdx] = None
            image[CamIdx] = []
            # Start Grabbing
            camera[CamIdx].StartGrabbing(pylon.GrabStrategy_LatestImageOnly)
            print("Cam",CamIdx,': Start Grabbing')
            
            iterator = 0

            while bLiveThraed[CamIdx]:
                grabResult = camera[CamIdx].RetrieveResult(5000, pylon.TimeoutHandling_ThrowException)

                if grabResult.GrabSucceeded():
                    image[CamIdx] = converter[CamIdx].Convert(grabResult) # Access the openCV image data
                    image[CamIdx] = image[CamIdx].GetArray() # change them to an array for easy access

                    if(image[CamIdx] != []):
                        image[CamIdx] = cv2.cvtColor(image[CamIdx], cv2.COLOR_BGR2RGB)
                        image[CamIdx] = cv2.resize(image[CamIdx], (345,270))
                        image[CamIdx] = ImageTk.PhotoImage(image = Image.fromarray(image[CamIdx]))

                        if panel[CamIdx] is None:
                            panel[CamIdx] = tk.Label(image=image[CamIdx])
                            panel[CamIdx].image = image[CamIdx]
                            panel[CamIdx].pack(side="left")
                            panel[CamIdx].place(x=(345*CamIdx)+(20*CamIdx)+20, y=100)
                            
                            panel[CamIdx] = tk.Label(image=image[CamIdx])
                            panel[CamIdx].image = image[CamIdx]
                            panel[CamIdx].pack(side="bottom")
                            panel[CamIdx].place(x=(345*CamIdx)+(20*CamIdx)+20, y=400)
                            #cv2.imwrite('./trial/camera'+str(CamIdx)+str(iterator)+'.jpg', image[CamIdx])
                            #iterator +=1
                        else:
                            panel[CamIdx].configure(image=image[CamIdx])
                            panel[CamIdx].image = image[CamIdx]
                        
                else:
                    print("Error: ", grabResult.ErrorCode)
        
                grabResult.Release()

        except genicam.GenericException as e:
            # Error handling
            print("An exception occurred.", e.GetDescription())

弃用警告如下图所示

在执行cv2.imwrite('./trial/camera'+str(CamIdx)+str(iterator)+'.jpg', image[CamIdx])后保存对应于其相机索引的每张图像如camera00、camera10、camera20、camera30的问题。产生的错误如下图所示。

生成的 GUI 如下图所示。

Answer 1

在下面的代码中，最后一行从opencv图像分配image[CamIdx]成为cv2不能写下的ImageTk.PhotoImage。在分配 image[CamIdx] = ImageTk.PhotoImage(image = Image.fromarray(image[CamIdx])).

之前考虑将 image[CamIdx] 存储到另一个变量

if(image[CamIdx] != []):
                        image[CamIdx] = cv2.cvtColor(image[CamIdx], cv2.COLOR_BGR2RGB)
                        image[CamIdx] = cv2.resize(image[CamIdx], (345,270))
                        image[CamIdx] = ImageTk.PhotoImage(image = Image.fromarray(image[CamIdx]))

到

save_img = None
if(image[CamIdx] != []):
                        image[CamIdx] = cv2.cvtColor(image[CamIdx], cv2.COLOR_BGR2RGB)
                        image[CamIdx] = cv2.resize(image[CamIdx], (345,270))
                        save_img = image[CamIdx]
                        image[CamIdx] = ImageTk.PhotoImage(image = Image.fromarray(image[CamIdx]))
cv2.imwrite('img.jpg',save_img)

对于弃用警告，以防 OP 想要检查 None 图片，正如 Christoph Rackwitz 在评论中指出的那样：don't use [] as a sentinel. use None. test with is None, not equality comparison.

如何从 python 中的逻辑语句中避免此弃用警告？

How to avoid this deprecation warning from a logical statement in python?

python

opencv

numpy

tkinter

basler