GB1468741A - Production of halftone images - Google Patents
Production of halftone imagesInfo
- Publication number
- GB1468741A GB1468741A GB1320474A GB1320474A GB1468741A GB 1468741 A GB1468741 A GB 1468741A GB 1320474 A GB1320474 A GB 1320474A GB 1320474 A GB1320474 A GB 1320474A GB 1468741 A GB1468741 A GB 1468741A
- Authority
- GB
- United Kingdom
- Prior art keywords
- location
- events
- picture
- sub
- array
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/161—Applications in the field of nuclear medicine, e.g. in vivo counting
- G01T1/164—Scintigraphy
- G01T1/1641—Static instruments for imaging the distribution of radioactivity in one or two dimensions using one or several scintillating elements; Radio-isotope cameras
- G01T1/1644—Static instruments for imaging the distribution of radioactivity in one or two dimensions using one or several scintillating elements; Radio-isotope cameras using an array of optically separate scintillation elements permitting direct location of scintillations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
- G01T1/2914—Measurement of spatial distribution of radiation
- G01T1/2978—Hybrid imaging systems, e.g. using a position sensitive detector (camera) to determine the distribution in one direction and using mechanical movement of the detector or the subject in the other direction or using a camera to determine the distribution in two dimensions and using movement of the camera or the subject to increase the field of view
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- High Energy & Nuclear Physics (AREA)
- General Physics & Mathematics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Image Processing (AREA)
- Measurement Of Radiation (AREA)
- Nuclear Medicine (AREA)
Abstract
1468741 Half-tone image production BAIRD-ATOMIC Inc 25 March 1974 [9 April 1973] 13204/74 Heading H4F Halftone images are produced on a CRT screen in response to coded signals indicative of the spatial distribution of radiation (e.g. radioactive events) emanating from a body, like areas being illuminated to have different mean brightness by arranging for different numbers of like sub-regions of each like area to be illuminated with like brightness in dependence upon the mean brightness indicated by each coded signal A high resolution radio-activity distribution detection system is described in which radioactive events originating in a subject under diagnosis are detected at XY locations of an array of sensing devices i.e. photodetectors optically coupled via light guides to an XY array of scintillators associated with a multiplane focussed collimator. The detected events at each XY location are accumulated and stored in corresponding address locations in a computer, and then the number stored at each address location is normalized into a Gray scale coded signal as a function of the greatest number of detected events at any one address location. The normalized Gray coded signals are then applied to a random access memory from which they are selectively fed to a CRT monitor via a read-only memory including Gray field character generators which controls the number of dot picture elements per unit area at XY locations on the display. Thus the number of radio-active events detected at each XY location of the seintillator array are presented at corresponding XY locations on the display as a number of illuminated sub-regions constituting picture dot elements, the greatest number of detected events in one location of the array being represented by the greatest number of picture dot elements per unit area. In the embodiment described sixteen shades of gray are presented on the display, the coded signal indicative of the greatest number of events detected at an XY location being the number sixteen, and the least number being the number one. In Fig. 4 a picture area 192 which corresponds to one address location is defined by a four by four matrix 194 having sixteen like sub-regions 196, and one or more sub-regions illuminated to form dot picture elements 198 are presented at predetermined locations (as defined by the Gray field character generators) within matrix 194 for each address location as a function of the normalized Gray scale coded signal (1-16) for that address location. The height and width dimensions of each sub-region 196 and each dot picture element 198 are equal to the height dimension of a raster line. The pattern of illumination in picture areas 192 containing the same odd number of dot picture elements 198 which are immediately above or below each other are mirror images of each other. As shown the patterns 192 increase in means brightness from one to the next in the series, and in accordance with the invention there is a first set 1-7 of consecutive patterns of illumination of the series that are respectively complementary, when considered in increasing order of mean brightness, to a second set 15-9 of consecutive patterns of the series considered in decreasing order to mean brightness, the mean brightness of each pattern of the second set being greater than that of each pattern of the first set. The subject under diagnosis is located on a platform which is movable by stepping motors in XY directions so that different areas of the subject may be analysed by the stationary scintillator array.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US34899373A | 1973-04-09 | 1973-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1468741A true GB1468741A (en) | 1977-03-30 |
Family
ID=23370431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1320474A Expired GB1468741A (en) | 1973-04-09 | 1974-03-25 | Production of halftone images |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPS49131640A (en) |
DE (1) | DE2417087A1 (en) |
GB (1) | GB1468741A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2140646A (en) * | 1979-12-29 | 1984-11-28 | Canon Kk | Image reproducing equipment |
GB2402571A (en) * | 2003-05-20 | 2004-12-08 | Software 2000 Ltd | Halftone bit mask generation for reduction of contouring |
US8705131B2 (en) | 2004-10-18 | 2014-04-22 | Software Imaging Technology Limited | Bit mask generation system |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4179100A (en) * | 1977-08-01 | 1979-12-18 | University Of Pittsburgh | Radiography apparatus |
JPS61110078A (en) * | 1984-11-02 | 1986-05-28 | Toshiba Corp | Nuclear medical data processor |
JPH0774948B2 (en) * | 1992-02-17 | 1995-08-09 | 株式会社毎日放送 | Display device using binary display element |
-
1974
- 1974-03-05 JP JP49025624A patent/JPS49131640A/ja active Pending
- 1974-03-25 GB GB1320474A patent/GB1468741A/en not_active Expired
- 1974-04-08 DE DE19742417087 patent/DE2417087A1/en not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2140646A (en) * | 1979-12-29 | 1984-11-28 | Canon Kk | Image reproducing equipment |
GB2402571A (en) * | 2003-05-20 | 2004-12-08 | Software 2000 Ltd | Halftone bit mask generation for reduction of contouring |
GB2402571B (en) * | 2003-05-20 | 2006-02-15 | Software 2000 Ltd | Bit mask generation system and printer drivers and printing methods incorporating bit masks generated utilising same |
US7025515B2 (en) | 2003-05-20 | 2006-04-11 | Software 2000 Ltd. | Bit mask generation system |
US8705131B2 (en) | 2004-10-18 | 2014-04-22 | Software Imaging Technology Limited | Bit mask generation system |
Also Published As
Publication number | Publication date |
---|---|
JPS49131640A (en) | 1974-12-17 |
DE2417087A1 (en) | 1974-10-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |