Chroma Test Setup for Complete Gamma Measurement on Video Signal Generators

时间： 2022-03-10 来源：CHROMA

技术问答

Displays measure the gamma value to correct the compatibility between our perception of brightness and the actual intensity of the light source. The images below show the effect of gamma correction on the same photo; the larger the gamma value, the more distinct the details in dark regions, while the display effects in bright regions decrease. Too high gamma values will reduce the image quality, so display manufacturers generally set the gamma value between 1.8 ~ 2.4.

The two graphs below plot the human perception against the brightness and grayscale signals from the display, following the gamma function L = aVγ+Lb defined by VESA in the Flat Panel Display Measurement Standard (302-5A). The brightness perception figure on the left depicts the response of the human eye to changes in brightness; the gamma 2.2 curve on the right is the curvature of the black to white curve as output by the monitor. Quantitative research has found that the human perception of brightness is a non-linear curve; we are slower at detecting brightness changes at high brightness than at low brightness. Therefore, adjustment of the gamma value makes the displayed brightness come closer to the perceived brightness by the human eye.

CHROMA's optical measurement equipment and signal generators can achieve automated testing without the need for a computer. Users can set the equipment to provide complete signal output in four standard colors (R/G/B/W) for thorough gamma measurements. The measurements can be configured as a standard gamma curve or shown as the gamma curve and value of each tested color up to 4096 (12bit) levels.

Chroma 2238 Video Pattern Generator provides 8K Super Hi-Vision (7680x4320/8192x4320) resolutions for testing, fully supporting 8K @ 60Hz resolution. Combined with Chroma 71241 color analyzer, the test setup supports a wide luminance range (0.001 ~ 6000cd/m2) and high-precision chromaticity ≤ ±0.002 (> 0.1 cd / m2) for measurement.

Users can set the output timings and patterns on the 7'' screen of CHROMA 2238 and control the Chroma 71241 color analyzer to measure the unit under test. The test functions enable free switching between a variety of test modes that, besides gamma measurement, also include chromaticity, brightness, and flicker measurement functions. The test results are directly shown through coordinates on the CIE color space diagrams. Chroma 71241 and Chroma 2238 test setup supports program editing as well as one-click retrieval of test data through a flash drive for highly improved production efficiency.

CHROMA provides complete solutions for these and other video test applications. For more details on our products, please visit Chroma's website.

发送到邮箱 |
+1 赞 0
收藏
评论 1
| 转发至：

本文由FY转载自CHROMA，原文标题为:Chroma Test Setup for Complete Gamma Measurement on Video Signal Generators，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

全部评论（1）

用户93009983 Lv4. 资深工程师 2022-03-17

好

没有更多评论了

【应用】Chroma色彩分析仪搭配视频信号产生器可推出视讯检测应用解决方案，完成Gamma量测

Chroma光学量测设备搭配视频信号产生器应用系统在不必搭配计算机的情况下达成自动化测试需求，根据使用者设定可完整提供R/G/B/W四种标准颜色的图形信号输出并完成Gamma量测，用户还可自由切换多种量测模式包含色度、亮度及闪烁量测等功能。

应用方案发布时间 : 2022-02-26

【应用】Chroma推出高阶投影机检测方案，对应高分辨率8K@60Hz检测，助力打造沉浸式虚拟世界

Chroma 2238视频信号图形产生器可搭配Chroma A223801 DisplayPort信号模块，提供全方位高阶投影机各项功能之检测应用。

应用方案发布时间 : 2023-07-22

【应用】Chroma 71241高精度通用量测探头用于测量Flicker闪烁，可精准量测电视辉度与色彩表现

Chroma 71241高精度通用量测探头，依循VESA/JEITA两大国际规范，所建立的闪烁量测方法，能准确的测量出显示器的Flicker数值，并能让使用者任意切换两种规范的量测模式来做Flicker量测。

应用方案发布时间 : 2022-09-22

Chroma 公司簡介及電力電子方案說明

型号- 62000H-S,62180H-1800S,MODEL 63600,190XX,63600,61500,62009L-30-5,62系列,63系列,63630-80-60,66系列,63610-80-20,MODEL 62000P,63640-80-80,61系列,MODEL 61500 SERIES,63600系列,62000L,636XX(功率)-XX(电压)-XX(电流),MODEL 87001,631XXA,633XXA,63630-600-15,62015L-60-6,A620034,62045L-60-7,MODEL 2238,62010L-36-7,MODEL 63600 SERIES,6310A,190XX系列,MODEL 7600A,MODEL 61500

商品及供应商介绍 - CHROMA - 2021.3.8 PDF 中文下载

Chroma 2238视频信号图形产生器提供12种高效能可替换式的信号模块，满足显示器视频、色彩、光学信号量测

Chroma 2238视频信号图形产生器为显示器的诊断专家，同时可与Chroma 71241高精度通用量测探头结合，提供客户完整、有效率的测试方案，协助提高生产效率。

厂牌及品类发布时间 : 2023-02-02

MODEL 71241 高精度通用测量侦测头

型号- 2238,2918,MODEL 71241,71241

数据手册 - CHROMA - 202107 PDF 中文下载查看更多版本

致茂电子将于Touch Taiwan展示最新显示器与AOI量测解决方案，涵盖Micro LED、Mini LED、8K等

致茂电子将于Touch Taiwan展示最新显示器与AOI量测解决方案，应用范围涵盖Micro LED、Mini LED、8K与最新显示应用等。

厂牌及品类发布时间 : 2019-08-28

MODEL 7123 DISPLAY COLOR ANALYZER

型号- A766007,A766006,MODEL 7123,A712200,A712301,A712300,A712102,A712302,A766003,A240100

数据手册 - CHROMA - 202002 PDF 英文下载

【仪器】不再为检测显示器颜色差异烦恼！Chroma推出小尺寸量测探头配备精准Delta E量测功能

CHROMA提供完整的小尺寸显示设备光学检测方案，Chroma 71242小尺寸量测探头具备弹性化的应用搭配，可于计算机、Chroma 2238视频信号图形产生器、Chroma 27014平面显示器测试器等主机上使用，精准量测穿戴装置、平板、手机、AR/VR之面板光学色彩表现。

产品发布时间 : 2023-09-27

Chroma将在2023显示周展览其最新系列的显示器和光学颜色测试解决方案，操作便利，效率高

Chroma将在今年的显示周展会上展示其最新系列的显示器和光学颜色测试解决方案。随着游戏显示器行业不断创新和改进规格，Chroma的展品将展出 A223814信号模块，这是一种先进的游戏显示器测试解决方案。

厂牌及品类发布时间 : 2023-05-25

Chroma Showcases Advanced Display and Optical Color Test Solutions at K-Display 2023

Chroma will exhibit automotive display, gaming display, and USB-C test solutions at the K-Display 2023 exhibition. The latest high-resolution and high-refresh-rate image test solutions for Mini/Micro LED and AR/VR devices will also be featured.

厂牌及品类发布时间 : 2023-08-05

【产品】可同时输出4中不同解析度与测试图形的视频信号图形产生器2238

Chroma推出的视频信号图形产生器 Model 2238，支援8K超高清解析度检测应用。且具有模组同步输出（Multi-Out）功能，带有Gigabit Ethernet 通讯介面和USB3.0接口。能够图形于触控莹幕即时显示，所见即所得。

新产品发布时间 : 2019-05-30

Chroma在Touch Taiwan 2023展示车载显示器、USB-C和游戏显示器测试解决方案

随着电动汽车市场的不断扩大，Chroma ATE针对控制面板、仪表盘、后视镜、车窗和门把手等位置的各种尺寸和分辨率的车载显示器开发了一种新的测试解决方案。在今年的 Touch Taiwan 展上，Chroma 将展示新一代车载显示测试解决方案，创新展示各种车载屏幕融入我们展台的内部空间。我们将展示 Chroma 27015 平板显示器测试仪，采用双槽设计，可同时检测两个不同尺寸的车辆显示器。它支持

厂牌及品类发布时间 : 2023-04-24

Chroma ATE Showcases Gaming Display, USB-C and In-Vehicle Display Test Solutions at Display Week 2023

In lockstep with the gaming display industry‘s constant innovation and improving specifications, Chroma‘s exhibit will feature the A223814 Signal Module, an advanced gaming monitor test solution that supports HDMI 2.1a, 10K@120Hz resolution output, Gaming-VRR, FVA, ALLM, QMS-VRR, and other test modes.

厂牌及品类发布时间 : 2023-05-26