The Video Electronics Standards Association (VESA) has announced the launch of a new ClearMR compliance test specification, which will provide a new quality metric for motion blur grading in digital displays and a logo for identification.
The ClearMR compatibility test specification will be applicable to existing LCD and OLED panels, TV screens, desktop monitors and embedded screens, allowing consumers to more clearly distinguish the levels of motion blur on various screens.
The new metric defined in the ClearMR standard, called Clear Motion Ratio (CMR), provides a clear value based on the ratio of clear pixels to blurred pixels, allowing consumers to easily compare the amount of motion blur across VESA-certified ClearMR displays. CMR replaces Motion Picture Response Time (MPRT) and other blur metrics because these metrics fail to accurately capture the true nature of blur.
Existing methods, such as MPRT, do not accurately reflect the nature of blur because time-based metrics alone cannot account for image enhancement and blur reduction techniques such as excessive overshoot and undershoot, which can cause artifacts or distortion and negatively impact image quality. VESA's ClearMR standard and logo program restricts the use of these enhancement techniques during testing, allowing consumers to fairly compare the motion blur quality of various VESA-certified ClearMR display products.
The VESA-certified ClearMR label includes multiple performance tiers, ranging from ClearMR 3000 to the highest ClearMR 9000. Each tier expresses the performance range of motion blur as a percentage based on the ratio of clear pixels to blurred pixels.
例如，ClearMR 7000的CMR範圍定義是清晰像素為模糊像素的65至75倍 (6500%至7500%)。每個層級在清晰度都提供視覺上得以辨識的變化，而越高的CMR數值表示越高的影像品質與更少的模糊畫面。
ClearMR certified products are tested using a high-speed digital camera. The camera captures a moving test pattern as the screen changes from frame to frame. This camera is then used with a light measurement device, such as a colorimeter, to verify the pattern's brightness. The captured images are compiled, archived, and analyzed to provide repeatable and objective CMR values.
After the products have completed their warm-up period, they are tested at room temperature using the default power-on configuration and at native screen resolution at maximum frame rate. To ensure fairness and avoid unfair comparisons with products that don't utilize blur reduction methods, backlight strobing is disabled during testing. Overshoot and undershoot are also limited during product testing to ensure overall visual performance is not compromised and to achieve specific numerical targets.
In the future, the ClearMR specification and label will also be used to measure products that support high dynamic range (HDR). However, currently, products supporting this specification must be tested in standard dynamic range (SDR) mode to obtain certification. Therefore, the Video Electronics Standards Association (VESA) is currently working on an update to ClearMR.
