🍺🍺哈喽，大家好丫，你们的小郭子又来啦

🌞今天我们继续聊一聊【如何利用Python将普通视频变成动漫视频】，

话不多说，直接上干货，嘻嘻嘻 ~

1. 安装onnxruntime库

2. 运行模型

3.实现动漫效果

4. 视频帧读取与视频帧写入

1. 安装onnxruntime库

pip install onnxruntime

如果想要用GPU加速，可以安装GPU版本的onnxruntime:

pip install onnxruntime-gpu

2. 运行模型

先导入onnxruntime库，创建InferenceSession对象，调用run函数。如下所示

import onnxruntime as rt 
sess = rt.InferenceSession(MODEL_PATH)
inp_name = sess.get_inputs()[0].name
out = sess.run(None, {inp_name: inp_image})

3.实现动漫效果


import cv2
import numpy as np
import onnxruntime as rt 

# MODEL = "models/anime_1.onnx"
MODEL = "models/anime_2.onnx"

sess = rt.InferenceSession(MODEL)
inp_name = sess.get_inputs()[0].name


def infer(rgb):
    rgb = np.expand_dims(rgb, 0)
    rgb = rgb *  2.0 / 255.0 - 1 
    rgb =  rgb.astype(np.float32) 
    out = sess.run(None, {inp_name: rgb})
    out = out[0][0]
    out = (out+1)/2*255
    out = np.clip(out, 0, 255).astype(np.uint8)
    return out

def preprocess(rgb):
    pad_w = 0
    pad_h = 0
    h,w,__ = rgb.shape
    N = 2**3
    if h%N!=0:
        pad_h=(h//N+1)*N-h
    if w%2!=0:
        pad_w=(w//N+1)*N-w
    # print(pad_w, pad_h, w, h)
    rgb = np.pad(rgb, ((0,pad_h),(0, pad_w),(0,0)), "reflect")
    return rgb, pad_w, pad_h

其中, preprocess函数确保输入图像的宽高是8的整数倍

4. 视频帧读取与视频帧写入

使用Opencv库，提取视频中每一帧并调用回调函数将视频帧回传。在将图片转视频过程中，通过定义VideoWriter类型变量WRITE确保唯一性。具体实现代码如下：

import cv2
from tqdm import tqdm
python学习交流Q群：770699889 ###

WRITER = None
def write_frame(frame, out_path, fps=30):
    global WRITER
    if WRITER is None:
        size = frame.shape[0:2][::-1]
        WRITER = cv2.VideoWriter(
            out_path,
            cv2.VideoWriter_fourcc(*'mp4v'),  # 编码器
            fps,
            size)
    WRITER.write(frame)

def extract_frames(video_path, callback):
    video = cv2.VideoCapture(video_path)
    num_frames = int(video.get(cv2.CAP_PROP_FRAME_COUNT))
    for _ in tqdm(range(num_frames)):
        _, frame = video.read()
        if frame is not None:
            callback(frame)
        else:
            break

好啦，今天的分享到这里就结束啦 ~

觉得我分享的文章不错的话，可以关注一下哦，嘻嘻嘻