gray_diff = cv2.absdiff(lastframe, gray) gray_diff = cv2.threshold(gray_diff, 30, 1, cv2.THRESH_BINARY)[1] 什么意思
时间: 2024-06-04 13:10:46 浏览: 7
这段代码是进行帧间差分,计算上一帧和当前帧的差异,并将差异值二值化为0或1。具体解释如下:
- cv2.absdiff(lastframe, gray):计算上一帧(lastframe)和当前帧(gray)的差异。返回的是两幅图像的像素值差的绝对值。
- cv2.threshold(gray_diff, 30, 1, cv2.THRESH_BINARY)[1]:将差异值二值化为0或1。如果像素值小于30,则将其设置为0,否则设置为1。返回的是二值化后的图像。
相关问题
解释这段代码的作用 def get_diff_img(self, original_img_path, beautify_img_path, diff_img_path): """ :return: * """ original_img = cv2.imread(original_img_path) beautify_img = cv2.imread(beautify_img_path) difference = cv2.absdiff(original_img, beautify_img) Conv_hsv_Gray = cv2.cvtColor(difference, cv2.COLOR_BGR2GRAY) max_thresh = 50 threshs = list(range(0, max_thresh, int(max_thresh / 10))) colors = ['f1ea09', 'efd60a', 'edc20b', 'eaae0d', 'e89a0e', 'e6850f', 'e47110', 'e15d12', 'df4913', 'dd3514'] diff_image = np.zeros(original_img.shape, dtype=np.uint8) for idx, thresh in enumerate(threshs): ret, mask = cv2.threshold(Conv_hsv_Gray, thresh, 255, cv2.THRESH_BINARY_INV) color = colors[idx] diff_image[mask != 255] = np.array(list(int(color[i:i + 2], 16) for i in (0, 2, 4))) diff_image = cv2.cvtColor(diff_image, cv2.COLOR_RGBA2BGRA) cv2.imwrite(diff_img_path, diff_image)
这段代码主要实现了比较两张图片的不同之处,并生成一张差异图。具体来说,它读取了两张图片的路径,使用OpenCV库的函数cv2.imread()读取这两张图片,接着使用cv2.absdiff()计算出两张图片的差异,将结果转换为灰度图像并存储在Conv_hsv_Gray中。然后,它定义了一个阈值列表threshs和一个颜色列表colors,用于根据不同的阈值给差异图像上色。接着,它将差异图像初始化为0,并使用循环迭代不同的阈值,并使用cv2.threshold()函数将灰度图像二值化,生成一个掩膜(mask),然后将颜色应用于掩膜区域,最后将结果存储在diff_image中。最后,它将diff_image转换为BGRA格式并将其写入指定的差异图像路径。
import cv2 # 定义阈值(相似度百分比) threshold = 90 # 加载存储在闪存中的视频码流 flash_video = cv2.VideoCapture('path/to/flash_video.mp4') # 加载接收到的视频码流 received_video = cv2.VideoCapture('path/to/received_video.mp4') # 检查视频是否成功打开 if not flash_video.isOpened() or not received_video.isOpened(): print("无法打开视频文件") exit() frame_count = min(flash_video.get(cv2.CAP_PROP_FRAME_COUNT), received_video.get(cv2.CAP_PROP_FRAME_COUNT)) match_count = 0 for i in range(int(frame_count)): # 从闪存视频和接收到的视频中读取帧 ret_flash, frame_flash = flash_video.read() ret_received, frame_received = received_video.read() if not ret_flash or not ret_received: print("视频读取错误") break # 将帧转换为灰度图像进行比较 gray_flash = cv2.cvtColor(frame_flash, cv2.COLOR_BGR2GRAY) gray_received = cv2.cvtColor(frame_received, cv2.COLOR_BGR2GRAY) # 使用均方差计算帧之间的相似度 mse = ((gray_flash - gray_received) ** 2).mean() # 计算相似度百分比 similarity = (1 - mse / 255) * 100 # 判断帧是否相似 if similarity >= threshold: match_count += 1 # 计算相似度百分比 match_percentage = match_count / frame_count * 100 # 判断是否通过 if match_percentage >= threshold: print("通过") else: print("失败") # 释放资源 flash_video.release() received_video.release() 请将这段程序用C语言实现
以下是将上述Python代码转换为C语言的示例实现:
```c
#include <stdio.h>
#include <stdlib.h>
#include <opencv2/opencv.hpp>
#define THRESHOLD 90.0
int main() {
cv::VideoCapture flashVideo("path/to/flash_video.mp4");
cv::VideoCapture receivedVideo("path/to/received_video.mp4");
if (!flashVideo.isOpened() || !receivedVideo.isOpened()) {
printf("无法打开视频文件\n");
return -1;
}
double frameCount = std::min(flashVideo.get(cv::CAP_PROP_FRAME_COUNT), receivedVideo.get(cv::CAP_PROP_FRAME_COUNT));
int matchCount = 0;
for (int i = 0; i < frameCount; i++) {
cv::Mat frameFlash, frameReceived;
bool retFlash = flashVideo.read(frameFlash);
bool retReceived = receivedVideo.read(frameReceived);
if (!retFlash || !retReceived) {
printf("视频读取错误\n");
break;
}
cv::Mat grayFlash, grayReceived;
cv::cvtColor(frameFlash, grayFlash, cv::COLOR_BGR2GRAY);
cv::cvtColor(frameReceived, grayReceived, cv::COLOR_BGR2GRAY);
cv::Mat diff;
cv::absdiff(grayFlash, grayReceived, diff);
cv::Scalar mse = cv::mean(diff.mul(diff));
double similarity = (1.0 - mse.val[0] / 255.0) * 100.0;
if (similarity >= THRESHOLD) {
matchCount++;
}
}
double matchPercentage = matchCount / frameCount * 100.0;
if (matchPercentage >= THRESHOLD) {
printf("通过\n");
} else {
printf("失败\n");
}
flashVideo.release();
receivedVideo.release();
return 0;
}
```
请确保已经安装了OpenCV库,并根据你的环境进行必要的配置和链接。此示例代码将使用OpenCV库进行视频读取、图像处理和比较,实现了与Python代码相同的功能。如果需要进一步优化和适配,你可以根据自己的需求进行修改。希望对你有所帮助!