Objective c 具有屏幕截图比较的视频帧
我有一个视频处理应用程序，它使用AVFoundation.h头文件保存视频截图。使用UIImagepicker上传屏幕截图后，我想播放该特定帧的视频。为此，我认为我应该将视频的每一帧与拍摄的视频截图进行比较Objective c 具有屏幕截图比较的视频帧,objective-c,xcode,xcode7,Objective C,Xcode,Xcode7,我有一个视频处理应用程序，它使用AVFoundation.h头文件保存视频截图。使用UIImagepicker上传屏幕截图后，我想播放该特定帧的视频。为此，我认为我应该将视频的每一帧与拍摄的视频截图进行比较 如何比较两个图像（不只是相等，如果图像几乎相同，则应检测） 如何播放特定帧中的视频 请通读代码，并建议我修改要做的比较视频帧和截图。我已成功地将视频的帧提取到tableview中。但无法将图像与截图进行比较 我浏览了互联网上可用的大多数方法，但找不到任何符合我需要的方法。提前谢谢。快乐编码
- (void)viewDidLoad {
[super viewDidLoad];
_imageArray=[[NSMutableArray alloc]init];
_framesArray=[[NSMutableArray alloc]init];
// Do any additional setup after loading the view.
NSURL *url=[NSURL fileURLWithPath:@"/****Image path***/Desktop/ImageExtract/ImageExtract/The Avengers-Iron-man Vs Nuke scene.mp4"];
NSDictionary *options = @{ AVURLAssetPreferPreciseDurationAndTimingKey : @YES };
AVAsset *myAsset = [AVURLAsset URLAssetWithURL:url options:options];
self.imageGenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:myAsset];
Float64 durationSeconds = CMTimeGetSeconds([myAsset duration]);
_times = [[NSMutableArray alloc] init];
for (Float64 i = 0; i < durationSeconds; i++) // For 25 fps in 15 sec of Video
{
[_times addObject:[NSValue valueWithCMTime:CMTimeMakeWithSeconds(i, 60)]];
}
[_imageGenerator generateCGImagesAsynchronouslyForTimes:_times
completionHandler:^(CMTime requestedTime, CGImageRef image, CMTime actualTime,
AVAssetImageGeneratorResult result, NSError *error) {
NSString requestedTimeString = (NSString )
CFBridgingRelease(CMTimeCopyDescription(NULL, requestedTime));
NSString actualTimeString = (NSString )
CFBridgingRelease(CMTimeCopyDescription(NULL, actualTime));
NSLog(@"Requested: %@; actual %@", requestedTimeString, actualTimeString);
if (result == AVAssetImageGeneratorSucceeded) {
NSLog(@"image generated");
UIImage *generatedImage=[UIImage imageWithCGImage:image];
[_imageArray addObject:generatedImage];
NSString* filename = [NSString stringWithFormat:@"Documents/frame_%d.png", frameCount];
NSString* pngPath = [NSHomeDirectory() stringByAppendingPathComponent:filename];
[_framesArray addObject:filename];
[UIImagePNGRepresentation(generatedImage) writeToFile: pngPath atomically: YES];
NSLog(@"Frame name %@",filename);
NSLog(@"Time of Frame %f",CMTimeGetSeconds(requestedTime));
NSLog(@"Frames Array %@",_framesArray);
frameCount++;
}
if (result == AVAssetImageGeneratorFailed) {
NSLog(@"Failed with error: %@", [error localizedDescription]);
NSLog(@"image Array %@",_imageArray);
NSLog(@"Count %d",_imageArray.count);
_imageTable=[[UITableView alloc]init];
_imageTable.frame=CGRectMake(0, 100, 320, 400);
_imageTable.dataSource=self;
_imageTable.delegate=self;
[self.view addSubview:_imageTable];
}
if (result == AVAssetImageGeneratorCancelled) {
NSLog(@"Canceled");
}
}];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return _imageArray.count;
}
- (UITableViewCell )tableView:(UITableView )tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell...
UIImageView *uuimage=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
uuimage.image=[_imageArray objectAtIndex:indexPath.row];
[cell addSubview:uuimage];
return cell;
}
-（void）viewDidLoad{
[超级视图下载]；
_imageArray=[[NSMutableArray alloc]init]；
_framesArray=[[NSMutableArray alloc]init]；
//加载视图后执行任何其他设置。
NSURL*url=[NSURL fileURLWithPath:@/****图像路径***/Desktop/ImageExtract/ImageExtract/The复仇者钢铁侠Vs Nuke scene.mp4”]；
NSDictionary*选项=@{AVURLASSETPREVERPRECISEDURATION和TIMINGKEY:@YES}；
AVAsset*myAsset=[AVURLAsset URLAssetWithURL:url选项：选项]；
self.imageGenerator=[AVAssetImageGenerator assetimagegenerator with asset:myAsset]；
Float64 durationSeconds=CMTimeGetSeconds（[myAsset duration]）；
_times=[[NSMutableArray alloc]init]；
for（Float64 i=0；i