Smartphones that include compact camera modules (CCM) are the most popular imaging devices in the world. Their small size necessitates advanced sensor & lens technology and precise manufacturing.

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Quality Standards

The v1 of the IEEE Camera Phone Image Quality standard, defines seven test areas for objective quality analysis. By using viewing conditions to relating subjective human perception to objective quality metrics, this standard provides a set of metrics that strongly correlate with perceived image quality.

Important Test Items

Part of the challenge of mobile device image quality evaluation is to test at macro distance, which necessitates a high precision test chart, and to test the cameras at long-range within the limited space of a factory environment.

Image Stabilization is a feature that is available on high-end mobile devices which can improve sharpness and low light performance by compensating for the motion of the photographer.

Manufacturing Testing

We work with test-equipment makers who can provide turnkey solutions that include our chart and software components. Our paper: “Managing supply chain image quality” outlines many of the challenges that come along with high volume manufacturing.

Compact Camera Module

The most popular form of camera, a compact camera module (CCM) contains lens and sensor integrated into a housing with a flex cable connection that is installed inside a mobile device such as a smartphone or tablet.

These come in fixed focus and autofocusvarieties.  Typically the rear facing camera (RFC) has autofocus, while the front-facing camera (FFC) is often fixed focus.

As these devices come in very small form factors, the quality of the components and precision of the manufacturing is critical to their ability to achieve acceptable image quality.  Testing at macro distance and long-range is necessary to ensure that the optomechanical design has been properly produced.