基于内容的图像检索，即CBIR(Content-based image retrieval)，是计算机视觉领域中关注大规模数字图像内容检索的研究分支。典型的CBIR系统，允许用户输入一张图片，以查找具有相同或相似内容的其他图片。而传统的图像检索是基于文本的，即通过图片的名称、文字信息和索引关系来实现查询功能。
本文是Wiki上统计的当前主要的基于内容的图像检索系统。
商业图像搜索引擎：
| 名称 | 描述 | 外部图像查询 | 元数据查询 | 索引的大小 ( 估计值, Millions of Images) | 组织 | 协议 (Open/Closed) |
|---|---|---|---|---|---|---|
| Elastic Vision | Smart image searcher with content-based clustering in a visual network. | No | No | Private Company | Closed | |
| Google Image Search | Google's CBIR system, note: does not work on all images | Yes | Yes | Public Company | Closed | |
| Baidu Image Search | Baidu's CBIR system | Yes | Yes | 1000M | Public Company | Closed |
| ID My Pill | Automatic prescription pill identification (CBIR) | Yes | No | Private Company | Open (via API) | |
| Imense Image Search Portal | CBIR search engine, by Imense. | No | Yes | 3M | Private Company | Closed |
| Imprezzeo Image Search | CBIR search engine, by Imprezzeo. | No | Yes | Private Company | Closed | |
| Visual Image Search | CBIR search engine, by pixolution | Yes | No | 10M | Private Company | Closed |
| Incogna Image Search | CBIR search engine, by Incogna Inc. | No | Yes | 100M | Private Company | Closed |
| Like.com | Shopping & fashion based CBIR engine | No | Yes | 1M | Private Company | Closed |
| Chic Engine | Visual fashion search engine (CBIR) | Yes | No | Private Company | Closed | |
| MiPai similarity search engine | Online similarity search engine | Yes | Yes | 100M | Individual | Closed |
| Piximilar | Demo engine, developed by Idee Inc. | No | No | 3M | Private Company1 | Closed |
| Empora | Product comparison & shopping using CBIR for product images. Previously known as Pixsta | No | Yes | 0.5M | Private Company | Closed |
| Shopachu | Shopping & fashion CBIR engine, by Incogna Inc. | No | Yes | 1M | Private Company | Closed |
| TinEye | CBIR site for finding variations of web images, by Idee Inc. | Yes | No | 1800M | Private Company | Closed |
| Tiltomo | CBIR system using Flickr photos | No | Yes | Private Company | Closed | |
| eBay Image Search | Image Search for eBay Fashion | No | Yes | 20M | Public Company | Closed |
| Visual Recognition Factory | Visual Recognition Factory | Yes | Yes | Private Company | Closed | |
| IMMENSELAB | CBIR search engine by KBKGROUP. | Yes | No | 10M | Private Company | Closed |
| Macroglossa Visual Search | CBIR visual search engine | Yes | No | Private Company | Closed |
研究项目（有一部分是开源的）：
|
名称 |
外部图像查询 |
元数据查询 |
索引大小 (估计值, Millions of Images) |
组织 |
协议 (Open/Closed) |
|
Yes |
Yes |
15M |
University |
Closed |
|
|
Yes |
Yes |
University |
Closed |
||
|
Yes |
No |
0.225M |
University |
Open |
|
|
Yes |
No |
University |
GPL |
||
|
Yes |
No |
Desktop-based |
University |
||
|
No |
No |
University |
Open |
||
|
Yes |
No |
Desktop-based |
GNU |
||
|
Yes |
Yes |
free-beta limited to 4k images |
Private Company |
Closed |
|
|
Yes |
No |
Desktop-based |
Individual |
Closed |
|
|
Yes |
No |
Individual |
|||
|
Yes |
Yes |
University |
Closed |
||
|
Yes |
No |
Desktop-based |
Research Institute |
Closed |
|
|
Yes |
Yes |
University |
GPL |
||
|
Yes |
Yes |
106M |
Research Institute |
Closed |
|
|
No |
No |
106M |
Research Institute |
Open |
|
|
Yes |
No |
Desktop-based |
University |
Closed |
|
|
Yes |
Yes |
130M |
University |
Closed |
|
|
No |
No |
12M |
University |
Closed |
|
|
Yes |
No |
Desktop-based |
Private company |
Closed |
|
|
Yes |
No |
Private Company / University |
Closed |
||
|
No |
No |
University |
Closed |
||
|
No |
No |
University |
Closed |
||
|
Yes |
No |
0.002M |
University |
Closed |
|
|
No |
Yes |
Institute |
Closed |
||
|
Yes |
Yes |
2.221M |
University |
Closed |
|
|
Yes |
No |
University |
Closed |
||
|
Yes |
No |
University |
Closed |
||
|
SHIATSU |
Yes |
Yes |
University |
Closed |
用过其中的LIRE和Caliph & Emir，还是比较好用的