PictBridge(DPS) Overview

1. PictBridge(DPS) Overview
Bear Lin
2009/04/28

2. Outline
Terminology
Introduction
Architectural Framework
Job Flow Example
Main Efforts to Implement PictBridge

3. Terminology
DPS(Digital Photo Solutions for Image Device)
DSC(Digital Still Image Camera)
PTP(Picture Transfer Protocol)
XML(Extensible Markup Language)
DPOF(Digital Print Order Format)

4. Introduction
CIPA DC-001-2003: Digital Photo Solutions(DPS) for
Imaging Devices, Standard of CIPA(Cameras & Imaging
Products Association).
“PictBridge” is a promotion name of DPS standard.
Main Site:
http://www.cipa.jp/pictbridge/index_e.html

5. Introduction(cont.)
PictBridge is a smart way to enable direct printing from
any PictBridge compliant DSC to any PictBridge
compliant printer, regardless of the manufacturer.

6. Introduction(cont.)
PictBridge v.s. DPOF:
DPOF 是一個開放的標準，它支援以下一些列印輸出設置：
選擇哪些照片要列印輸出、
每張照片列印的份數、
列印索引圖片、
圖像旋轉、
用戶資訊（姓名、地址等等）、
圖像資訊（標題、說明）等等。
不過，由於數碼相機和輸出設備的差異性問題，以及一些成本控制的因素，導致目前 DPOF 的
應用還只基於一個比較基本的階段，很多高級的功能無法廣泛普及。
比如，目前數碼相機直接連接印表機的功能雖然可以實現，但是卻存在嚴重的相容性問題，即
只能同一個品牌的數碼相機和印表機才能實現直聯列印的功能。
因此， 現在 DPOF 逐漸在淡出人們的視線，一個全新的、真正跨品牌的、廣泛的標準——
PictBridge 正逐漸取代 DPOF。
http://baike.baidu.com/view/65011.htm
http://www.casio.com.tw/qv/dpof/index.html
http://www.digital.idv.tw/DIGITAL/Classroom/MROH-CLASS/oh89/index-89.htm

7. Architectural Framework
The DSC is USB Still Image Capture Class “Device”,
and the printer works as a USB “Host”.
USB Device USB I/F USB Host

8. Architectural Framework(cont.)
DPS architecture is based on Client-Server model.
The DSC and the printer must support the Picture
Transfer Protocol(PTP) and the USB.

9. Architectural Framework(cont.)
DPS actions = a request phase + a response phase, both
request/response are well formed XML.
DPS has two kinds of actions: DPS operations and DPS
events.
DPS operation: a transaction initiated by the DPS client
and completed by the DPS server.
DPS event: a notification from a DPS server to the DPS
client. It is initiated when a state change occurs in the
server.

10. Architectural Framework(cont.)
DPS Action Results: For every DPS Action request, a
DPS Action result shall be returned along with the DPS
Action response.

11. Architectural Framework(cont.)
DPS’s actions and events are based on PTP.
Each action or event is a sequence of PTP commands.
PTP contains details of Operation, Response, Event and
ObjectFormat codes required by the Printer and DSC.

12. Architectural Framework(cont.)
DPS Print Service Actions:

13. Architectural Framework(cont.)
DPS Storage Service Actions:

14. Job Flow Example

15. Job Flow Example(cont.)
DPS Operation XML script example:

16. Job Flow Example(cont.)
DPS Operation XML script example:

17. Job Flow Example(cont.)
DPS Event XML script example:

18. Main Efforts to Implement PictBridge
Implement DPS over the USB physical layer with the Still
Image Capture Device Class PTP protocol.
XML parsers are required because DPS actions will be
passed over PTP/USB in their original XML format.