ISO 17215-1:2014 道路車両—カメラ用ビデオ通信インターフェース（VCIC）—パート1：一般情報とユースケースの定義 | ページ 2

3.1 用語と定義

この文書の目的上、次の用語と定義が適用されます。

Foreword

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The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment.

ISO 17215 consists of the following parts, under the general title Road vehicles — Video communication interface for cameras (VCIC):

• Part 1: General information and use case definition
• Part 2: Service discovery and control
• Part 3: Camera message dictionary
• Part 4: Implementation of communication requirements

Introduction

Driver assistance systems are more and more common in road vehicles. From the beginning, cameras were part of this trend. Analogue cameras were used in the beginning, because of lower complexity of the first systems. With increasing demand for more advanced functionality, digital image processing has been introduced. So-called one box design cameras (combining a digital image sensor and a processing unit) appeared in the vehicles.

Currently, the market demands such systems with multiple functions. Even different viewing directions are in use. It seems to be common sense that six up to 12 cameras in a single vehicle will be seen in the next future. Out of this and the limitation in size, power consumption, etc. it will lead to designs where the cameras are separated from the processing unit. Therefore, a high performance digital interface between camera and processing unit is necessary.

This International Standard has been established in order to define the use cases, the communication protocol, and the physical layer requirements of a video communication interface for cameras which covers the needs of driver assistance applications.

The video communication interface for cameras

• incorporates the needs of the whole life cycle of an automotive grade digital camera,
• utilizes existing standards to define a long-term stable state-of-art video communication interface for cameras usable for operating and diagnosis purpose,
• can be easily adapted to new physical data link layers including wired and wireless connections by using existing adaption layers, and
• is compatible with AUTOSAR.

This part of ISO 17215 is related to the general information and use case definition. This is a general overview document which is not related to the OSI model.

To achieve this, it is based on the Open Systems Interconnection (OSI) basic reference model specified in ISO/IEC 7498-1 and ISO/IEC 10731 which structures communication systems into seven layers. When mapped on this model, the protocol and physical layer requirements specified by this International Standard, in accordance with Table 1, are broken into following layers:

• application (layer 7), specified in ISO 17215-3;
• presentation layer (layer 6), specified in ISO 17215-2;
• session layer (layer 5), specified in ISO 17215-2;
• transport protocol (layer 4), specified in ISO 17215-4, ISO 13400-2;
• network layer (layer 3), specified in ISO 17215-4, ISO 13400-2;
• data link layer (layer 2), specified in ISO 17215-4, ISO 13400-3;
• physical layer (layer 1), specified in ISO 17215-4, ISO 13400-3.

ISO 17215-1 has been established in order to define the use cases for vehicle communication systems implemented on a video communication interface for cameras; it is an overall document not related to the OSI model.

ISO 17215-3 covers the application layer implementation of the video communication interface for cameras; it includes the API.

ISO 17215-2 covers the presentation layer implementation of the video communication interface for cameras.

ISO 17215-4, being the common standard for the OSI layers 1 to 4 for video communication interface for cameras, complements ISO 13400-2 and ISO 13400-3 and adds the requirement for video transmission over Ethernet.

ISO 17215-2 and ISO 17215-3 (OSI layers 5 to 7) services have been defined to be independent of the ISO 17215-4 (OSI layers 1 to 4) implementation. Therefore, ISO 17215-4 could be replaced by other future communication standards.

1 Scope

This International Standard describes the general use cases and communication scenarios, for a video communication interface for cameras used in video-based driver assistant systems.

This part of ISO 17215 gives an overview of the structure and the partitioning of this International Standard and shows the relation between the different parts (see Figure 1).

This part of ISO 17215 serves as communication infrastructure for driver assistant applications that could be

• presenting video images to the driver,
• presenting warnings to the driver (e.g. using an HMI), or
• interacting with the vehicle (e.g. emergency breaking).

The terminology defined in this part of ISO 17215 is common for all video communication interfaces for cameras communication systems and is used throughout all parts of this International Standard.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms, definitions, and abbreviated terms

3.2 Abbreviated terms