7 18 :013Approvd for pub5c re,•m; dietbuton uimtahd. United States Army Aeromedical Research LaboratoryFort Rucker, Alabama 36362-0577 Oualified reauestersQualified requesters may obtain copies from the Defense Technical Information Center (DTIC), Cameron Station, Alexandria, Virginia 22314. Orders will be expedited if placed through the librarian or other person designated to request documents from DTIC. Chanae of addressOrganizations receiving reports from the U.S. Army Aeromedical Research Laboratory on automatic mailing lists should confirm correct address when corresponding about laboratory reports. DispositionDestroy this document when it is no longer needed. Do not return it to the originator.The views, opinions, and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position policy, or decision, unless so designated by other official dowumentation.Citation of trade names in this report does not constitute an official Department of the Army endorsement or approval of the use of such commercial items. Reviewed 23I 02 I ABSTRACT (Continue on reverse if necessay and identify by block number)The current practice of basing the performance of cathode ray tube (CRT) displays on static image quality figures-of-merit fails to provide a valid assessment of a display's ability to reproduce real-world scenes where there is relative motion within the scene or between the sensor and scene.Techniques which provide assessment of a display's capability to reproduce spatial information in a dynamic environment are needed. One technique based on response to sinusoidal counterphase modulation is presented. ABSTRACTThe current practice of basing the performance of cathode ray tube (CRT) displays solely on static image quality figures-of-merit fails to provide a valid assessment of a display's ability to reproduce real-world scenes where there is relative motion within the scene or between the sensor and scene. Techniques which provide assessment of a display's capability to reproduce spatial information in a dynamic environment are needed. One technique based on response to sinusoidal counterphase modulation is presented.
Qualified requesters Qualified requesters may obtain copies from the Defense Technical Information Center (DTIC), Cameron Station, Alexandria, Virginia 223 14. Orders will be expedited if placed through the librarian or other person designated to request documents from DTIC. Change of address Organizations receiving reports from the U.S. Army Aeromedical Research Laboratory on automatic mailing lists should confirm correct address when corresponding about laboratory reports. Disposition Destroy this document when it is no longer needed. Do not return it to the originator. Disclaimer The views, opinions, and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy, or decision, unless so designated by other official documentation. Citation of trade names in this report does not constitute an official Department of the Army endorsement or approval of the use of such commercial items. Unclassified REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 la REPORT SECURITY CLASSIFICATION 1 b RESTRICTIVE MARKINGS Unclassified 2a SECURITY CLASSIFICATION AUTHORITY 3. DISTRIBUTION / AVAILABILITY OF REPORT Approved for public release, distribution 2b DECLASSIFICATION I DOWNGRADING SCHEDULE unlimited 4 PERFORMING ORGANIZATION REPORT NUMBER(S) 5 MONITORING ORGANIZATION REPORT NUMBER(S) USAARL Report No. 99-18 6a NAME OF PERFORMING ORGANIZATION U.S. Army Aeromedical Research Laboratory 6c ADDRESS (City. Stale, and ZIP Code) P.O. Box 620577 Fort Rucker, AL 36362-0577 6a. NAME OF FUNDING /SPONSORING ORGANIZATION 6c ADDRESS (City, Slate. and Z/P Code) 11. TITLE (Include Security Classification) 6b OFFICE SYMBOL 7a NAME OF MONITORING ORGANIZATION
Because of limitations in the size of the field-of-view (FOV) available in helmet mounted displays (HMD) using the full overlap display mode, where the entire FOV is binocular, partial binocular overlap displays, which can be convergent or divergent, have been proposed. One consequence of this is a perceptual effect known as tuning, which is a subjective darkening in the monocular regions of the FOV, which can in some cases cause fragmentation of the FOV into three regions. A concern is the possible effect on target identification in the monocular regions, particularly in areas affected by luning. We review data we have collected in our binocular vision lab on the effect of display mode on these aspects of visual perception.
The evaluation of helmet-mounted displays (HMDs) consists of optical, photometric, photographic and system performance tests that involve proper positioning and alignment of measuring tools with respect to the HMD. Evaluations are generally time consuming and involve days of meticulous testing. To shorten the time required to evaluate an HMD, we have developed a laboratory system where the positioning and alignment requirements for each test are accomplished in one step. Further, the system allows for the interchange of measuring instruments so that proper alignment is achieved as soon as the measuring instrument is mounted. In practice, the system has shortened the time required to evaluate an HMD by about 60%. The system allows for ease of position anywhere within the HMD's field-of-view (FOV). A key characteristic of the system is that the entrance pupil of the evaluation system is collocated with the HMD's exit pupil.
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