我正在制作一个需要翻转画面的视频处理项目。我尝试使用cvFlip，但似乎没有沿y轴翻转（x轴工作......）并导致分段错误。还有其他选择??
cv::Mat dst=src; //src= source image from cam
cv::flip(dst, dst, 1); //segmentation fault shown
imshow("flipped",dst);
答案 0 :(得分：14)
cv::Mat src=imload("bla.png");
cv::Mat dst; // dst must be a different Mat
cv::flip(src, dst, 1); // because you can't flip in-place (leads to segfault)
答案 1 :(得分：6)
使用cv::flip并将1作为flipcode传递。
使用示例代码查看您的编辑，您无法翻转到位。您需要一个单独的目标cv::Mat：
cv::Mat dst;
cv::flip(src, dst, 1);
imshow("flipped",dst);
答案 2 :(得分：5)
关键是要创建与@AggregateRoot
@Entity
@Table(name = "news")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class NewsAggregate extends AuditingAggregateRoot implements Serializable {
private static final Logger log = LoggerFactory.getLogger(NewsAggregate.class);
@Id
@Column(name = "news_id")
private String newsId;
@ManyToOne
@JoinColumn(name = "author_id", referencedColumnName = "id")
private UserAggregate authorId;
@Column(name = "publish_date")
private ZonedDateTime publishTime = null;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(
name = "tags_news",
joinColumns = {@JoinColumn(name = "news_id", referencedColumnName = "news_id")},
inverseJoinColumns = {@JoinColumn(name = "tag", referencedColumnName = "tag")})
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
private Set<Tags> tags = new HashSet<Tags>();
@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true)
@JoinColumn(name = "news_id", referencedColumnName = "news_id")
@Fetch(FetchMode.JOIN)
private List<NewsTranslation> newsTranslation = new ArrayList<NewsTranslation>();
public NewsAggregate(Set<Tags> tags, UserAggregate authorId) {
this.newsId = generateId(authorId.getId());
this.tags = tags;
this.authorId = authorId;
this.publishTime = ZonedDateTime.now();
}
private NewsAggregate(Builder builder) {
this.authorId = Preconditions.checkNotNull(builder.authorId);
this.publishTime = builder.publishTime;
this.tags = Preconditions.checkNotNull(builder.tags);
this.newsTranslation = Preconditions.checkNotNull(builder.newsTranslation);
}
private String generateId(long userId) {
return ZonedDateTime.now().toInstant().toEpochMilli() + "_" + userId;
}
public static NewsAggregate createNews(Set<Tags> tags, UserAggregate authorId, CreateNewsDto createNewsDto) {
NewsAggregate news = new NewsAggregate(tags, authorId);
log.info(">>>>>>>>>>>>>>>>>> news_id = "+news.getNewsId());
NewsLangId newsLangId = new NewsLangId(news.getNewsId(), "en");
NewsTranslation newsTranslation = new NewsTranslation(newsLangId, createNewsDto.getTitle(),
createNewsDto.getShortDescription(), createNewsDto.getLongDescription());
List<NewsTranslation> newsTranslations = new ArrayList<>();
newsTranslations.add(newsTranslation);
news.addTranslation(newsTranslations);
return news;
}
private void addTranslation(List<NewsTranslation> newsTranslations) {
this.newsTranslation = newsTranslations;
}
完全相同的dst：
src