Local 'Paging' to Enable Better Image Zoom Capability on a Non-Programmable Terminal
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Amell, SJ: AUTHOR [+6]
An image-capable Non-Programmable Terminal (NPT) provides local '+' and '-' pushbuttons to enable local paging of a decompressed and scaled image.
Local 'Paging' to Enable Better Image Zoom Capability on
image-capable Non-Programmable Terminal (NPT) provides local
'+' and '-' pushbuttons to enable local paging of a decompressed and
An NPT decompresses
and scales a received image or fax into
video Random Access Memory (RAM). The video RAM image/fax data is
presented on the NPT display screen. When the user wishes to view a
large image or fax at a higher scale to see detail, the complete
decompressed and scaled image/fax could exceed the size of the video
When the host
application specifies an image/fax scaling
percentage which exceeds the size of the video RAM, the NPT can add
one or more '+' or '-' local pushbuttons, as needed beside the scroll
bar(s). The NPT would only decompress and scale a portion of the
image/fax data into the video RAM. When a scale up request is
received from the host application, the NPT can maintain the user's
viewing location within the image/fax. If this results in image/data
'above' what is currently in video RAM, a '-' local pushbutton is
added above the vertical scroll bar (the vertical scroll bar size is
automatically reduced by one character position). Similarly, if this
results in image/fax data 'below' what is currently in the video RAM,
a '+' local pushbutton is added below the vertical scroll bar (again
the scroll bar size is automatically reduced). The horizontal scroll
bar works similarly.
roughly shows normal viewing of an image with both
vertical and horizontal scroll bars required.
o IIII is image data
o The vertical scroll bar is shown on the right from the A to the
o The horizontal scroll bar is shown below from the < to the >.
o The NPT has "scroll bar characters" which provide the appearance
personal computer (PC)-like graphic user interface (GUI)
and horizontal scroll bars.
roughly shows the result when the user scales up until a
'+' local pushbutton is required -- the user is viewing the first
portion of the image data.
o The + is a loca...