Selective document image data compression technique
- 29 Cameo Way, San Francisco, CA 94131
- 1674 Cordoba St., #4, Livermore, CA 94550
A method of storing information from filled-in form-documents comprises extracting the unique user information in the foreground from the document form information in the background. The contrast of the pixels is enhanced by a gamma correction on an image array, and then the color value of each of pixel is enhanced. The color pixels lying on edges of an image are converted to black and an adjacent pixel is converted to white. The distance between black pixels and other pixels in the array is determined, and a filled-edge array of pixels is created. User information is then converted to a two-color format by creating a first two-color image of the scanned image by converting all pixels darker than a threshold color value to black. All the pixels that are lighter than the threshold color value to white. Then a second two-color image of the filled-edge file is generated by converting all pixels darker than a second threshold value to black and all pixels lighter than the second threshold color value to white. The first two-color image and the second two-color image are then combined and filtered to smooth the edges of the image. The image may be compressed with a unique Huffman coding table for that image. The image file is also decimated to create a decimated-image file which can later be interpolated back to produce a reconstructed image file using a bilinear interpolation kernel.--(235 words)
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- Fu, Chi-Yung (29 Cameo Way, San Francisco, CA 94131);Petrich, Loren I. (1674 Cordoba St., #4, Livermore, CA 94550)
- Patent Number(s):
- US 5754697
- OSTI ID:
- 871566
- Country of Publication:
- United States
- Language:
- English
Similar Records
Image compression technique
Image compression technique
Related Subjects
235
adjacent
array
background
bilinear
black
coding
color
color value
combined
compressed
compression
compression technique
comprises
contrast
converted
converting
correction
create
created
creating
darker
data
data compression
decimated
decimated-image
determined
distance
document
edge array
edges
enhanced
extracting
file
filled-edge
filled-in
filtered
foreground
form
form-documents
format
gamma
generated
huffman
image
image array
image data
information
interpolated
interpolation
kernel
lighter
lying
method
pixel
pixels
produce
reconstructed
reconstructed image
scanned
scanned image
selective
smooth
storing
storing information
table
technique
threshold
threshold value
two-color
unique
user
user information
value
white
words