{"id":556842,"date":"2024-11-05T18:16:14","date_gmt":"2024-11-05T18:16:14","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/eia-tep105-17-1990\/"},"modified":"2024-11-05T18:16:14","modified_gmt":"2024-11-05T18:16:14","slug":"eia-tep105-17-1990","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/ecia\/eia-tep105-17-1990\/","title":{"rendered":"EIA TEP105-17-1990"},"content":{"rendered":"

MTFs FOR MONOCHROME CRTs<\/strong><\/p>\n

Background<\/i><\/p>\n

In most cases, the interface between humans and machines is a
\nvisual display.<\/p>\n

The sharpness and readability of raster-scanned Cathode-Ray Tube
\n(CRT) displays conventionally has been determined by how far the
\nvemcal raster height could be reduced while still displaying
\nindividual scan lines (Shrinking Raster Line Width Measurement).
\nThis method yields a rough "order-of-magnitude" estimate of the
\nvisible raster-line capacity of a display device.<\/p>\n

As user demands for display readability increase, the
\nsubjectivity and over-simplification of this technique limits its
\npractical utility for precise engineering specifications. A more
\ndefinitive method of measuring the true beam spread is needed to
\ndescribe the complete display performance. The measurement of line
\nwidth by a scanning photometer removes a great deal of the
\nsubjectivity from this type of measurement. in this method, a
\nmeasurement is made of the light distribution across the width of a
\nsingle raster-he. This measurement reveals the true profile of
\nlight intensity across a raster-line in an objective manner. The
\nline profile, in tum, usually is designated by its full-width at
\n50% of its peak light intensity or luminance.<\/p>\n

Moreover, continual user demands for better image quality
\nthrough increased pixel density has underscored the need for more
\ndescriptive methods of assessing the total imaging capability of a
\nCRT display. A quantification of the accuracy achieved in
\nreproducing the input signal on the viewer's screen is the ultimate
\ngoal. The preferred specification to describe this performance
\ncharacteristic of a CRT display is the Modulation Transfer Function
\n(MTF).<\/p>\n

The MTF takes into account not only the raster-line width at one
\nspecific percentage of peak intensity, but also accounts for the
\nentire line profile shape. It can be shown analytically that the
\nshape of the raster-line profile as well as the beam width are
\nevaluated in the MTF. Phosphor screen spreading, reflections from
\nthe phosphor and optical coatings, as well as saturation effects of
\nthe screen also affect to the MTF.<\/p>\n

An additional advantage of the MTF measurement is that other
\nelements of the display system may be incorporated into the
\nevaluation, and thus, provide a composite MTF specification for the
\ntotal display system. The MTF usually is presented as a curve
\nrepresenting modulation transfer across the spatial frequency
\nbandpass of the display device or system.<\/p>\n

One method to evaluate the MTF is to drive a CRT grid or cathode
\nwith a sine-wave signal. Synchronized with an appropriate
\nraster-scan, typically 525 lines, bright-to-dark sine-wave bars are
\ngenerated on the display screen. Reference conditions can be
\nselected to assure full-on and full-off performance of the display.
\nThe bright and dark bars are scanned with a slit-aperture
\nphotometer such as that described in EIA Test Method 105-7.<\/p>\n

Statement of Purpose<\/i><\/p>\n

The purpose of this test method is to provide a procedure to
\ncompute the MTF of monochrome CRTs in order to quantify the
\ndiscemability and quality of displayed information. While the
\nmathematical concepts of the MTF are complex, this test method
\nprovides a software package which aiiows users to easily convert
\nspot profile data into MTF data., There is no need for mathematical
\ncalculations by the user. The software package is designed for use
\non any computer system with a standard FORTRAN-77 compiler, and a
\nsecond version of the software for an IBM-PC (or l\u00fb\u00fb%-compatibles)
\npersonal computer provides graphical presentations of the spot
\nprofile and associated MTF data.<\/p>\n","protected":false},"excerpt":{"rendered":"

MTF Test Method for Monochrome CRT Display Systems<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ECIA<\/b><\/a><\/td>\n1990<\/td>\n24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":556853,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2649],"product_tag":[],"class_list":{"0":"post-556842","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-ecia","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/556842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/556853"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=556842"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=556842"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=556842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}