opencv 4.9.0 不支持的文件格式错误

Question

在下面的代码中遇到此错误

def train_classifier(self):
        data_dir = "Photo_data"
        path = [os.path.join(data_dir, file) for file in os.listdir(data_dir)]

        faces = []
        ids = []

        for image in path:
            img = Image.open(image).convert('L')  #Gray scale image
            image_np = np.array(img, 'uint8')
            id = int(os.path.split(image)[1].split('.')[1])

            faces.append(image_np)
            ids.append(id)
            cv2.imshow("Training", image_np)
            cv2.waitKey(1) == 13
        ids = np.array(ids)

        # Train the classifier and save
        clf = cv2.face.LBPHFaceRecognizer_create()
        clf.train(faces, ids)
        clf.write("classifier.xml")
        cv2.destroyAllWindows()
        messagebox.showinfo("Result", "Training Photo sample Completed!!")

错误：

cv2.error: OpenCV(4.9.0) /io/opencv_contrib/modules/face/src/lbph_faces.cpp:362: 
error: (-210:Unsupported format or combination of formats) 
Empty training data was given. You'll need more than one sample 
to learn a model. in function 'train'

尝试卸载 opencv-python 然后使用 pip 安装 opencv-contrib-python

Answer 1

您的文件可能已损坏，但目录中可能有非图像文件。

添加此行：

for image in path:
    print(f"about to open {image}")  # <<<<<<
    img = Image.open(image).convert('L')  #Gray scale image

或者直接进行类似的事情

for image in path:
    if not image.endswith(('.jpg', '.gif', '.png')):
        next

筛选出您不期望的文件。