圆柱体与球面展开摄影系统——精密电动旋转·积分球均匀无影照明·多波段光谱·三维曲面痕迹无畸变平面展开高精度成像与比对平台（枪弹痕迹检验/工具痕迹鉴定/曲面物证固定分析核心装备）

 

圆柱体与球面展开摄影系统——精密电动旋转·积分球均匀无影照明·多波段光谱·三维曲面痕迹无畸变平面展开高精度成像与比对平台（枪弹痕迹检验/工具痕迹鉴定/曲面物证固定分析核心装备）

〖重要合规前置声明〗 本产品为国家管制类刑事技术检验鉴定专用特种装备，仅面向具备法定鉴定资质与刑事技术检验许可的各级公安机关刑事技术部门、人民检察院技术部门、司法鉴定机构及授权刑事技术实验室定向研发、生产与供应，严禁向任何个人、无资质企业及非授权单位销售或提供。本设备的购置、配备、使用与管理，必须严格遵守《中华人民共和国刑事诉讼法》《司法鉴定程序通则》《公安机关涉案枪支弹药性能鉴定工作规定》及国家关于刑事技术装备管理、枪弹痕迹检验的相关法律法规与行业技术标准，必须由经过专业培训、取得相应枪弹痕迹检验或工具痕迹检验岗位资质的人员规范操作，严禁无资质单位和个人违规购置、使用、转让本装备，严禁因违规操作导致检材表面痕迹损毁、变形或原始特征灭失，严禁将本设备用于法定痕迹检验鉴定之外的任何用途。

产品概述

圆柱体与球面展开摄影系统——精密电动旋转·积分球均匀无影照明·多波段光谱·三维曲面痕迹无畸变平面展开高精度成像与比对平台（亦称圆柱体与球面展开摄影系统、曲面痕迹展开成像仪）是一款专为刑事科学技术领域设计的特种曲面痕迹高精度成像与展开装备，属于公安刑事技术枪弹痕迹检验、工具痕迹鉴定及各类曲面物证固定分析领域的核心光学检验平台。该产品旨在彻底解决对弹壳、弹头、圆柱形工具、管状物及球形客体等曲面载体上遗留的膛线痕迹、击针孔、抛壳挺痕、拉壳钩痕、剪切线条痕迹及擦划痕迹进行无变形、完整化、高清晰度光学记录与比对的业界长期难题。系统通过集成精密电动旋转台（旋转误差<0.002°）、高分辨率CCD逐帧采集、积分球漫反射均匀照明、八波段可调光谱光源及专业图像展开拼接软件，将三维曲面上的环周分布痕迹精确、无几何畸变地“展开”为一幅连续的二维平面图像，完美适配枪弹痕迹同一认定中的弹壳底面及柱面痕迹自动化展开比对、工具痕迹检验中的圆柱体断头线条痕迹完整记录、各类曲面客体上微量擦划痕迹及附着物的固定提取等专业鉴定场景。生成的标准化展开图像可直接输入专业枪弹痕迹比对系统或工具痕迹比对软件进行自动化特征匹配，从根本上解决了传统分段拍摄拼接因光照不均、旋转定位不准导致接缝错位或几何失真、以及金属高反光表面因定向照明产生亮斑干扰痕迹细节观察等严重影响鉴定结论科学性的实战痛点，能够为枪弹痕迹检验鉴定人及工具痕迹鉴定人提供“旋转精度亚角秒级、曲面展开零畸变、积分球照明无影均匀、多波段光谱反差增强”的专业级曲面痕迹数字化成像与标准化输出能力，是进行枪弹痕迹同一认定、工具痕迹检验及各类曲面物证鉴定不可替代的核心专业装备。

技术原理

该系统基于“多角度序列平行光摄影—数字化图像配准与无缝拼接”的核心技术原理，并通过积分球漫反射照明与软件化精密运动控制实现全流程自动化。在机械运动控制层，系统内置高精度电动旋转台，其旋转精度误差<0.002°，转速在45至90秒/转范围内可调。操作者将圆柱体或球面检材通过专用夹具（枪弹夹持口径涵盖6mm、7.62mm、9mm、18mm等多种规格，另有通用工痕检材夹具）精确对中固定于旋转台上，在专用控制软件界面输入检材直径、所需展开角度（0-360°可任意设定）等参数后，系统即自动规划旋转步长与拍摄序列。

在图像采集层，固定位置的300万像素CCD相机（分辨率2048×1536）配合0.7×–4.5×连续变倍物镜，在130mm工作距离下对检材表面进行连续或等间隔的序列拍摄，每帧图像覆盖曲面的一段局部区域。相机支持平行、垂直、斜向三种摄影光路配置，可根据检材形态与痕迹分布灵活选择最佳拍摄姿态。

在光照控制层，系统采用积分球漫反射照明技术与八波段可调LED光源（紫外365nm、蓝430nm、绿510nm、红600nm及其组合光、白光）协同工作。积分球内壁的高反射率漫射涂层使光线在球体内经多次反射后从各个方向均匀投射至检材表面，彻底消除金属等高反光客体因定向照明产生的局部高光亮斑与光带，确保每一帧序列图像的光照条件完全一致。多波段光谱选择功能使鉴定人可根据痕迹物质的光学特性——如金属划痕对蓝光的吸收增强、微量附着物在紫外下的荧光反应、潜血痕迹对特定波段的吸收差异——灵活选择最佳照明波段，最大化增强痕迹与基底之间的视觉反差。

在数字图像处理层，专用展开控制与图像处理软件通过USB2.0通讯接口实时控制旋转台运动与相机拍摄同步。获取的序列图像经软件自动进行边缘对齐、透视校正与无缝拼接融合，根据预设的圆柱体直径与展开角度参数，将多帧局部曲面图像精确重建为一幅完整的、无几何畸变的二维平面展开图。展开图完整保留了原始痕迹的线条流向、形态特征及相互位置关系，可直接输入专业枪弹痕迹比对系统或工具痕迹比对软件进行自动化特征匹配与同一认定分析。

核心功能与合规实战价值

积分球均匀照明与无影成像技术，为金属高反光曲面痕迹检验提供理想的光学环境
系统采用积分球漫反射照明技术，光线在球体内经多次反射后从360°全方位均匀投射至检材表面，形成无方向性的纯粹漫射光环境。该照明方式彻底消除了传统定向光源照射金属弹壳、镀镍工具表面等高反光客体时产生的局部高光亮斑与明暗光带——这些光斑往往恰好掩盖击针孔底部的细微形态特征、抛壳挺痕的边缘轮廓或擦划线条的起始点等关键鉴定细节。在积分球均匀光照下，金属表面痕迹的每一处微观起伏、每一条线条纹路的走向均以一致的灰阶层次清晰呈现，确保序列拍摄的各帧图像光照条件完全一致，为后续图像拼接与比对分析提供了高质量、可重复的光学基础，满足枪弹痕迹同一认定技术规范对痕迹图像采集光照均匀性与可重复性的严格要求。

亚角秒级精密电动旋转与软件化全自动展开控制，实现曲面痕迹的高精度无畸变平面化
系统内置高精度电动旋转台，旋转精度误差<0.002°，旋转速度可在45至90秒/转范围内精确调节。操作者仅需在专用控制软件界面输入检材直径、所需展开角度（0-360°可任意设定）等参数，系统即自动规划旋转步长、同步控制相机逐帧拍摄并通过图像配准算法完成序列图像的自动对齐、校正与无缝拼接，最终输出一幅连续的、无几何畸变的二维平面展开图。该“一键式”全自动展开成像流程将传统依赖操作者经验的手动分段拍摄与暗室拼接工艺彻底标准化，展开图的重复性与客观性不再受个体操作差异影响，完全契合司法鉴定对检验方法可重复性与结果客观性的核心要求。展开图可作为枪弹痕迹同一认定或工具痕迹线条接合比对的标准化数字图像输入，与样本弹壳展开图或工具实验样本进行自动化特征匹配，鉴定结论的科学性得到可视化、可量化的客观数据有力支撑。

八波段可调光谱照明与多角度摄影光路，满足多类型痕迹与客体的差异化显现需求
系统配备八波段LED光源（紫外365nm、蓝430nm、绿510nm、红600nm及其组合光、白光），各波段亮度与聚光角度均可独立调节。鉴定人可根据不同的痕迹物质与基底组合选择最优照明波段——紫外光可激发微量生物附着物的固有荧光，蓝光可增强金属表面擦划线条的暗场对比度，绿光可提升红铜弹壳上痕迹的细节辨识度，白光则满足常规反射光观察与彩色记录需求。系统同时支持平行、垂直、斜向三种摄影光路配置，主机具备升降70mm、水平移动70mm、水平旋转0-90°、倾斜0-90°的多维度机械调节能力，配合高度400mm的立柱与250mm粗调行程，可灵活适应从微型弹壳到较长圆柱形工具等各类检材的拍摄定位需求。

专用夹具系统与多规格兼容性，保障各类曲面检材的稳固精确对中与无损固定
系统提供多种口径的枪弹专用夹具（涵盖6mm、7.62mm、9mm、18mm等常见弹壳口径）及通用工痕检材夹具，确保不同规格的弹壳、弹头、圆柱形工具断头及管状物证在旋转台上精确对中并稳固夹持，旋转过程中不会发生偏心摆动或松动。夹具与检材的接触面经过柔化处理，在保证固定可靠性的同时不对检材表面痕迹造成任何附加划伤或压迫变形，完整体现了物证检验“无损优先、保全原貌”的法定原则。

合规应用场景

枪弹痕迹的自动化展开与同一认定比对场景
在涉枪案件的枪弹痕迹检验中，鉴定人将射击后提取的弹壳通过专用夹具固定于旋转台上，使用本系统对弹壳圆柱面上的击针孔、抛壳挺痕、拉壳钩痕及弹膛后切痕等环周分布痕迹进行360°全周展开成像。积分球均匀照明确保金属弹壳表面无高光干扰，旋转台高精度运转保证展开图无接缝错位。生成的标准化展开图可直接输入专业枪弹痕迹比对系统，与样本弹壳展开图进行自动化特征匹配与线条接合比对，为认定或排除发射枪支提供客观、量化、可重复检验的核心图像证据。鉴定程序完全符合《公安机关涉案枪支弹药性能鉴定工作规定》及枪弹痕迹检验技术规范的要求。

圆柱形工具痕迹的展开检验与同一认定场景
在盗窃、破坏等案件的钳剪工具痕迹检验中，鉴定人使用本系统对电缆圆柱断头、锁柱断头、钢筋断端等圆柱形客体上的剪切线条痕迹进行全周或指定角度展开摄影。展开图完整呈现了线条痕迹的分布规律、流向特征及个体细微形态，消除了传统分段拍摄因光照不一致、接图误差导致的线条错位或漏检风险。展开后的痕迹图像可与嫌疑工具制作的实验样本展开图在同一比对软件中进行线条接合比对，为工具同一认定提供标准化、可量化的图像证据支撑。

各类曲面客体上微量痕迹与附着物的固定与提取场景
对于瓶盖螺纹、管状容器表面、弧形工具刃面等非标准曲面客体上遗留的潜在指纹、微量擦划痕迹、油漆转移附着物或生物斑迹，鉴定人使用本系统的多波段光谱照明与多角度摄影功能，选择最佳激发/吸收波段增强痕迹与基底的光学反差，通过展开摄影完整记录曲面上的痕迹分布全貌。该无损光学固定方式为后续指纹显现、DNA提取或理化检验预留了完整的原始检材，完全符合痕迹物证检验“光学优先、无损优先”的标准作业顺序。

核心技术参数

展开与控制系统方面，采用软件控制方式，通过USB2.0通讯接口实现旋转台与相机的全自动联动。电动旋转台支持360°旋转，旋转误差<0.002°，转速45-90秒/转可调。展平角度0-360°可任意设定。成像与摄影系统方面，摄影方式支持平行、垂直、斜向三种配置。物镜为0.7×–4.5×连续变倍，工作距离130mm。摄像头为300万像素CCD，分辨率2048×1536。检测范围方面，圆柱面可检测外径3–80mm、内径50–78mm、高度1–100mm的检材；球面可检测直径40–120mm的检材。照明系统方面，配备八波段LED光源（紫外365nm、蓝430nm、绿510nm、红600nm及其组合光、白光），照明方式包括积分球环状漫反射照明、LED内照明及多向可调照明。机械调节方面，主机具备升降70mm、水平70mm、水平旋转0-90°、倾斜0-90°的调节能力；立柱高度400mm，粗调行程250mm。专用夹具方面，枪弹夹持口径涵盖6mm、7.62mm、9mm、18mm等多种规格，另配备通用工痕检材夹具。软件方面，配备专业图像处理与展开控制软件。

合规实战应用案例

某市公安刑事科学技术研究所在受理一起涉枪故意伤害案件的枪弹痕迹鉴定时，需对现场提取的7.62mm口径弹壳与嫌疑人处扣押的疑似发射枪支制作的样本弹壳进行同一认定。鉴定人将现场弹壳通过专用夹具固定于圆柱体与球面展开摄影系统的旋转台上，在软件界面输入弹壳直径与360°全周展开参数后，系统自动完成旋转序列拍摄与无缝拼接，生成一幅连续清晰的弹壳圆柱面展开图，弹壳上的击针孔底部形态、抛壳挺痕的线条纹理及弹膛后切痕的排列特征均清晰无畸变呈现。样本弹壳随后以相同参数完成展开成像，两张展开图被同步导入专业枪弹比对系统进行特征自动匹配与人工复核。经比对，鉴定人认定两枚弹壳上的抛壳挺痕线条接合良好、击针孔形态特征吻合，出具了认定同一的枪弹痕迹鉴定意见书，鉴定结论在法庭质证中被采信。

某省司法鉴定中心工具痕迹检验室在办理一起系列盗窃电缆案件的鉴定时，检验人员使用本系统对从案发现场提取的被剪断电缆圆柱形铜芯断头进行展开摄影。检验人员选择蓝光波段照明以增强铜芯表面剪切线条的暗场对比度，设置360°全周展开参数后系统自动完成成像，生成的展开图完整呈现了铜芯断头表面剪切线条的连续分布与个体走向特征。检验人员随后使用同一系统对嫌疑人处起获的液压断线钳制作的实验样本铜芯进行相同参数展开成像，将现场检材与实验样本的展开图进行线条接合比对，成功认定现场电缆系由该液压断线钳剪切形成。本案中曲面展开摄影系统所提供的高精度、全周连续线条图像为工具痕迹同一认定提供了不可替代的技术支撑。

厂家信息：北京毕思特联合科技有限公司
网址：https://www.bestlh.com
地址：北京市亦庄开发区经海六路一号院尖子班 C9 独栋
电话：010-56526048

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〖Important Compliance Precaution〗 This product is a state-controlled specialized equipment for criminal technical forensic examination and identification, which is solely developed, produced and supplied to authorized entities such as criminal technical departments of public security organs, technical departments of people's procuratorates, forensic identification institutions, and authorized criminal technical laboratories with statutory identification qualifications and criminal technical examination permits. Any sale or supply to individuals, non-qualified enterprises and unauthorized units is strictly prohibited. The procurement, deployment, use and management of this equipment must strictly comply with the Criminal Procedure Law of the People's Republic of China, the General Rules for Judicial Authentication Procedures, the Provisions on the Performance Appraisal of Firearms and Ammunition Involved in Cases by Public Security Organs, and national laws, regulations and industrial technical standards regarding criminal technical equipment management and firearm trace examination. Operation must be carried out exclusively by professionally trained personnel holding corresponding firearm trace examination or tool mark examination post qualifications. Unauthorized units and individuals are strictly forbidden from purchasing, using or transferring this equipment. Any surface trace damage, deformation, or loss of original characteristics of the evidence caused by improper operation, as well as any use of this equipment for purposes other than statutory forensic trace examination and identification, is strictly prohibited.

Product Overview

The Cylindrical & Spherical Surface Unwrapping Photography System — Precision Motorized Rotation, Integrating Sphere Uniform Shadowless Illumination, Multi-Band Spectrum, 3D Curved Surface Trace Distortion-Free Planar Unwrapping High-Precision Imaging & Comparison Platform (also referred to as the Cylindrical & Spherical Surface Unwrapping Photography System or Curved Surface Trace Unwrapping Imager) is a specialized high-precision curved surface trace imaging and unwrapping device designed specifically for the field of criminal technical science. It constitutes a core optical examination platform in the fields of criminal technical firearm trace examination, tool mark identification, and the preservation and analysis of various curved surface evidence. This product is purpose-built to thoroughly resolve the long-standing industry challenge of performing non-deformation, complete, high-definition optical recording and comparison of traces left on curved surface carriers such as cartridge cases, bullets, cylindrical tools, tubular objects, and spherical objects—including rifling marks, firing pin impressions, ejector marks, extractor marks, shear striation traces, and scratch marks. Through the integration of a precision motorized rotary stage (rotation error <0.002°), high-resolution CCD frame-by-frame acquisition, integrating sphere diffuse reflection uniform illumination, an eight-band adjustable spectral light source, and professional image unwrapping and stitching software, the system accurately and without geometric distortion "unwraps" the circumferentially distributed traces on a three-dimensional curved surface into a single continuous two-dimensional planar image. It perfectly adapts to professional forensic examination scenarios such as the automated unwrapping and comparison of cartridge case base and cylindrical surface traces in firearm identification, the complete recording of cylindrical fracture striation traces in tool mark examination, and the preservation and extraction of trace scratch marks and adhering materials on various curved surface objects. The generated standardized unwrapped image can be directly imported into professional firearm trace comparison systems or tool mark comparison software for automated feature matching. This fundamentally resolves operational pain points that seriously affect the scientific validity of identification conclusions, such as seam misalignment or geometric distortion in traditional segmented photography and stitching due to uneven illumination and inaccurate rotational positioning, and bright spot interference on highly reflective metal surfaces caused by directional lighting that obscures the observation of trace details. It provides firearm trace examiners and tool mark examiners with "sub-arcsecond rotary precision, zero-distortion curved surface unwrapping, shadowless uniform illumination from an integrating sphere, and multi-band spectral contrast enhancement" professional-grade curved surface trace digital imaging and standardized output capability. It is an irreplaceable core piece of professional equipment for conducting firearm trace identification, tool mark examination, and the identification of various curved surface evidence.

Technical Principle

This system is based on the core technical principle of "multi-angle sequential parallel light photography—digital image registration and seamless stitching," achieving full-process automation through integrating sphere diffuse reflection illumination and software-controlled precision motion control. At the mechanical motion control layer, the system features a built-in high-precision motorized rotary stage with a rotational accuracy error of <0.002° and adjustable rotational speed ranging from 45 to 90 seconds per revolution. The operator precisely centers and secures the cylindrical or spherical evidence on the rotary stage using dedicated fixtures (cartridge case clamping diameters include various specifications such as 6mm, 7.62mm, 9mm, and 18mm, along with universal tool mark evidence fixtures). After entering parameters such as the evidence diameter and the desired unwrapping angle (freely settable from 0-360°) into the dedicated control software interface, the system automatically plans the rotation step size and shooting sequence.

At the image acquisition layer, a fixed-position 3-megapixel CCD camera (resolution 2048×1536), equipped with a 0.7×–4.5× continuously variable magnification objective lens, performs continuous or equally spaced sequential photography of the evidence surface at a working distance of 130mm, with each frame covering a localized section of the curved surface. The camera supports three photographic optical path configurations—parallel, perpendicular, and oblique—allowing flexible selection of the optimal shooting posture based on the evidence shape and trace distribution.

At the illumination control layer, the system employs integrating sphere diffuse reflection illumination technology working in synergy with an eight-band adjustable LED light source (ultraviolet 365nm, blue 430nm, green 510nm, red 600nm, their combined light, and white light). The high-reflectivity diffuse coating on the inner wall of the integrating sphere causes the light to be uniformly projected onto the evidence surface from all directions after multiple internal reflections, completely eliminating localized high-brightness spots and bright bands on highly reflective objects such as metal surfaces caused by directional illumination, ensuring that the illumination conditions for each frame of the sequential images are perfectly consistent. The multi-band spectral selection function allows the forensic examiner to flexibly select the optimal illumination wavelength based on the optical characteristics of the trace material—such as the enhanced absorption of blue light by metal scratches, the fluorescence reaction of trace adhering materials under ultraviolet light, and the absorption differences of latent blood traces for specific wavebands—maximally enhancing the visual contrast between the trace and the substrate.

At the digital image processing layer, the dedicated unwrapping control and image processing software controls the rotary stage motion and camera shooting synchronously in real time via a USB2.0 communication interface. The acquired sequential images are automatically subjected to edge alignment, perspective correction, and seamless stitching and fusion by the software. Based on the preset cylinder diameter and unwrapping angle parameters, multiple frames of partial curved surface images are precisely reconstructed into a single complete, geometrically distortion-free, two-dimensional planar unwrapped image. The unwrapped image completely preserves the line flow, morphological characteristics, and mutual positional relationships of the original traces and can be directly imported into professional firearm trace comparison systems or tool mark comparison software for automated feature matching and identification analysis.

Core Functions and Compliance Operational Value

Integrating Sphere Uniform Illumination and Shadowless Imaging Technology, Providing an Ideal Optical Environment for the Examination of Traces on Highly Reflective Metal Curved Surfaces
The system employs integrating sphere diffuse reflection illumination technology. Light is uniformly projected onto the evidence surface from all 360° directions after multiple reflections within the sphere, creating a purely diffused, non-directional light environment. This illumination method completely eliminates the localized high-brightness spots and light and dark bands that occur when traditional directional light sources irradiate highly reflective objects such as metal cartridge cases and nickel-plated tool surfaces—spots that often precisely obscure critical identification details such as the fine morphological features at the base of the firing pin impression, the edge contour of the ejector mark, or the starting point of scratch lines. Under the uniform illumination of the integrating sphere, every microscopic undulation and the orientation of every striation on the metal surface trace is clearly presented with a consistent grayscale level, ensuring that the illumination conditions for each frame of the sequential images are perfectly consistent. This provides a high-quality, repeatable optical foundation for subsequent image stitching and comparison analysis, meeting the stringent requirements of firearm trace identification technical standards for illumination uniformity and repeatability in trace image acquisition.

Sub-Arcsecond Precision Motorized Rotation and Software-Controlled Fully Automated Unwrapping, Achieving High-Precision, Distortion-Free Planarization of Curved Surface Traces
The system is equipped with a built-in high-precision motorized rotary stage with a rotational accuracy error of <0.002° and an adjustable rotational speed range of 45 to 90 seconds per revolution. The operator only needs to enter parameters such as the evidence diameter and the desired unwrapping angle (freely settable from 0-360°) into the dedicated control software interface. The system then automatically plans the rotation step size, synchronously controls the camera to capture frames one by one, and completes the automatic alignment, correction, and seamless stitching of the sequential images using image registration algorithms, ultimately outputting a continuous, geometrically distortion-free two-dimensional planar unwrapped image. This "one-click" fully automated unwrapping imaging process completely standardizes the traditional manual segmented photography and darkroom stitching techniques that previously relied on operator experience. The repeatability and objectivity of the unwrapped image are no longer affected by individual operational differences, perfectly meeting the core requirements of forensic identification for the repeatability of examination methods and the objectivity of results. The unwrapped image can serve as a standardized digital image input for firearm trace identification or tool mark striation matching comparison. Automated feature matching with sample cartridge case unwrapped images or tool test samples can be performed, with the scientific validity of the identification conclusion powerfully supported by visual, quantifiable objective data.

Eight-Band Adjustable Spectral Illumination and Multi-Angle Photographic Optical Paths, Meeting the Differentiated Visualization Needs of Multiple Trace Types and Objects
The system is equipped with an eight-band LED light source (ultraviolet 365nm, blue 430nm, green 510nm, red 600nm, their combined light, and white light), with the brightness and focusing angle of each band being independently adjustable. The forensic examiner can select the optimal illumination band based on different trace material and substrate combinations—ultraviolet light can excite the intrinsic fluorescence of trace biological residues, blue light can enhance the dark field contrast of scratch lines on metal surfaces, green light can improve the detail visibility of traces on red copper cartridge cases, and white light meets the needs of conventional reflected light observation and color recording. The system simultaneously supports three photographic optical path configurations—parallel, perpendicular, and oblique. The main unit possesses multi-dimensional mechanical adjustment capabilities, including 70mm vertical lift, 70mm horizontal movement, 0-90° horizontal rotation, and 0-90° tilt. Combined with a column height of 400mm and 250mm coarse adjustment travel, this allows flexible adaptation to the photographic positioning requirements of various types of evidence, from miniature cartridge cases to longer cylindrical tools.

Dedicated Fixture System and Multi-Specification Compatibility, Ensuring Stable, Precise Centering and Non-Destructive Fixation of Various Curved Surface Evidence
The system provides dedicated cartridge case fixtures of multiple calibers (covering common cartridge case calibers such as 6mm, 7.62mm, 9mm, and 18mm) and universal tool mark evidence fixtures. This ensures that cartridge cases, bullets, cylindrical tool fractures, and tubular evidence of different specifications are precisely centered and securely clamped on the rotary stage, without eccentric wobble or loosening during rotation. The contact surfaces between the fixtures and the evidence are softened to ensure that no additional scratching or compression deformation is caused to the surface traces of the evidence while maintaining reliable fixation, fully embodying the statutory principle of "non-destructive priority, preserving the original appearance" in physical evidence examination.

Compliant Application Scenarios

Automated Unwrapping and Identification Comparison Scenario for Firearm Traces
In the firearm trace examination of cases involving firearms, the forensic examiner secures the cartridge case collected after firing onto the rotary stage using a dedicated fixture. This system is used to perform 360° full-circumference unwrapping imaging of the circumferentially distributed traces on the cylindrical surface of the cartridge case, such as the firing pin impression, ejector mark, extractor mark, and breech face marks. The integrating sphere uniform illumination ensures that the metal cartridge case surface is free from high-intensity light interference, and the high-precision operation of the rotary stage ensures that the unwrapped image is free from seam misalignment. The generated standardized unwrapped image can be directly imported into a professional firearm trace comparison system for automated feature matching and striation matching comparison with the unwrapped image of a sample cartridge case. This provides objective, quantitative, and repeatably verifiable core image evidence for identifying or excluding the firing firearm. The identification procedure fully complies with the Provisions on the Performance Appraisal of Firearms and Ammunition Involved in Cases by Public Security Organs and the technical standards for firearm trace examination.

Unwrapping Examination and Identification Scenario for Cylindrical Tool Marks
In the examination of shear tool marks in cases of theft and sabotage, the forensic examiner uses this system to perform full-circumference or designated-angle unwrapping photography of the shear striation traces on cylindrical objects such as sheared cable cylindrical fracture surfaces, lock cylinder fractures, and rebar fracture ends. The unwrapped image completely presents the distribution patterns, flow characteristics, and individual fine morphological details of the striation traces, eliminating the risks of line misalignment or missed detection caused by inconsistent illumination and image stitching errors in traditional segmented photography. The unwrapped trace image can be compared against the unwrapped image of a test sample created by the suspected tool in the same comparison software for line matching comparison, providing standardized and quantifiable image evidence support for tool mark identification.

Preservation and Extraction Scenario for Trace Evidence and Adhering Materials on Various Curved Surface Objects
For bottle cap threads, tubular container surfaces, curved tool blades, and other non-standard curved surface objects bearing latent fingerprints, trace scratch marks, transferred paint residues, or biological stains, the forensic examiner uses the system's multi-band spectral illumination and multi-angle photography functions to select the optimal excitation/absorption band to enhance the optical contrast between the trace and the substrate. Through unwrapping photography, the complete distribution of traces on the curved surface is fully documented. This non-destructive optical preservation method preserves the complete original evidence for subsequent fingerprint development, DNA extraction, or physicochemical examination, fully complying with the standard operational sequence of "optical priority, non-destructive priority" in trace evidence examination.

Core Technical Parameters

Regarding the unwrapping and control system, a software-controlled method is adopted, achieving fully automated linkage between the rotary stage and the camera via a USB2.0 communication interface. The motorized rotary stage supports 360° rotation with a rotation error of <0.002° and an adjustable rotation speed of 45-90 seconds per revolution. The unwrapping angle can be freely set from 0-360°. In terms of the imaging and photography system, the photography method supports three configurations: parallel, perpendicular, and oblique. The objective lens is a 0.7×–4.5× continuous zoom, with a working distance of 130mm. The camera is a 3-megapixel CCD with a resolution of 2048×1536. For the detection range, the system can examine cylindrical surfaces with an outer diameter of 3–80mm, an inner diameter of 50–78mm, and a height of 1–100mm; spherical surfaces with a diameter of 40–120mm can also be examined. The illumination system is equipped with an eight-band LED light source (ultraviolet 365nm, blue 430nm, green 510nm, red 600nm, their combined light, and white light). Illumination methods include integrating sphere ring-shaped diffuse illumination, LED internal illumination, and multi-directional adjustable illumination. For mechanical adjustment, the main unit has an adjustment range of 70mm vertical lift, 70mm horizontal movement, 0-90° horizontal rotation, and 0-90° tilt. The column has a height of 400mm and a coarse adjustment travel of 250mm. Dedicated fixtures include cartridge case clamping diameters covering multiple specifications such as 6mm, 7.62mm, 9mm, and 18mm, with an additional universal tool mark evidence fixture provided. The system is equipped with professional image processing and unwrapping control software.

Compliant Field Application Cases

When accepting a firearm trace identification case involving a suspected intentional injury with a firearm, a municipal criminal technical science research institute needed to perform an identification comparison between a 7.62mm caliber cartridge case collected from the scene and a sample cartridge case fired from a suspected firearm seized from the suspect. The forensic examiner secured the scene cartridge case onto the rotary stage of the Cylindrical & Spherical Surface Unwrapping Photography System using a dedicated fixture. After entering the cartridge case diameter and 360° full-circumference unwrapping parameters into the software interface, the system automatically completed the rotational sequential photography and seamless stitching, generating a continuous and clear unwrapped image of the cylindrical surface of the cartridge case. The morphology of the base of the firing pin impression, the striation texture of the ejector mark, and the arrangement characteristics of the breech face marks on the cartridge case were all clearly and distortion-free presented. The sample cartridge case was subsequently subjected to unwrapping imaging using the same parameters. The two unwrapped images were synchronously imported into a professional firearm comparison system for automated feature matching and manual review. Upon comparison, the examiner determined that the ejector mark striations on the two cartridge cases matched well and the morphological features of the firing pin impressions were consistent. An expert opinion confirming identity was issued, and the identification conclusion was admitted during court cross-examination.

In handling a case concerning a series of cable thefts, the tool mark examination laboratory of a provincial judicial identification center used this system to perform unwrapping photography on the cylindrical copper core fracture surface of a sheared cable collected from the crime scene. The examiner selected the blue light band for illumination to enhance the dark field contrast of the shear striations on the copper core surface. After setting the 360° full-circumference unwrapping parameters, the system automatically completed the imaging, and the generated unwrapped image fully presented the continuous distribution and individual directional characteristics of the shear striations on the surface of the copper core fracture. The examiner then used the same system to perform unwrapping imaging with the same parameters on a test sample copper core cut by a hydraulic cable cutter seized from the suspect. A line-matching comparison was conducted between the unwrapped images of the scene evidence and the test sample, successfully identifying that the scene cable had been cut by that specific hydraulic cable cutter. In this case, the high-precision, full-circumference continuous striation images provided by the curved surface unwrapping photography system served as irreplaceable technical support for the tool mark identification.

Manufacturer Information: Beijing Best United Technology Co., Ltd.
Website: https://www.bestlh.com
Address: Building C9, Jianziban, No.1 Courtyard, Jinghai Sixth Road, Yizhuang Development Zone, Beijing
Tel: 010-56526048