Enhanced method of multilayer compression of PDF (image) files using OCR systems
View Patent ↗In one embodiment, the invention discloses, a method for processing a document image. The method comprises segmenting the document image into a picture component and a non-picture component; compressing the non-picture component; and saving the uncompressed picture component and the compressed non-picture component in memory so that the document image may be recomposed to form a recomposed image based on the uncompressed picture component and the compressed non-picture component.
1. A method for processing a document image, the method comprising:
segmenting the document image into a picture component and a non-picture component;
from the non-picture component, constructing a background layer, a chromatic layer and a monochrome mask for the non-picture component, wherein the chromatic layer is constructed by substituting a spatially corresponding rectangle for each character in the non-picture component;
compressing the non-picture component; and
saving the uncompressed picture component and the compressed non-picture component in memory so that the document image forms a recomposed image based on the uncompressed picture component and the compressed non-picture component.
2. The method of claim 1 , wherein the method further comprises identifying one or more blocks in the non-picture component after segmenting the document image into the picture component and the non-picture component, wherein the background layer comprises a background color for each block in the non-picture component.
3. The method of claim 1 , wherein the monochrome mask acts as a switch to control when a pixel in the recomposed image would be rendered based on the background and chromatic layers.
4. The method of claim 1 , wherein segmenting the document image into the picture component comprises identifying each picture in the document image based on one or more chromaticity changes.
5. The method of claim 4 , wherein said identifying is performed automatically.
6. The method of claim 4 , wherein said identifying is performed manually.
7. The method of claim 1 , wherein the spatially corresponding rectangle for each character in the non-picture component is created with a same color as found in the respective character.
8. The method of claim 1 , wherein the characters of the non-picture component of the document image are constructed in the chromatic layer.
9. A system comprising:
a processor; and
a memory coupled to the processor, the memory storing instructions which when executed by the processor cause the system to perform a method for processing an image document, the method comprising:
segmenting the document image into a picture component and a non-picture component;
from the non picture component constructing a background layer, a chromatic layer and a monochrome mask for the non-picture component, wherein the chromatic layer is constructed by substituting a spatially corresponding rectangle for each character in the non-picture component;
compressing the non-picture component; and
saving the uncompressed picture component and the compressed non-picture component in memory so that the document image forms a recomposed on the uncompressed picture component and the compressed non-picture component.
10. The system of claim 9 , wherein the method further comprises identifying one or more blocks in the non-picture component after segmenting the document image into the picture component and the non-picture component, wherein the background layer comprises a background color for each block in the non-picture component.
11. The system of claim you 10 , wherein the monochrome mask acts as a switch to control when a pixel in the recomposed image would be rendered based on the background and chromatic layers.
12. The system of claim 9 , wherein segmenting the document image into the picture component comprises identifying each picture in the document image based on one or more chromaticity changes.
13. The system of claim 9 , wherein the spatially corresponding rectangle for each character in the non-picture component is created with a same color as found in the respective character.
14. A non-transitory computer-readable medium having stored thereon a sequence of instructions which when executed by a computer, cause the computer to perform a method for processing a document image, the method comprising:
segmenting the document image into a picture component and a non-picture component;
from the non-picture component, constructing a background layer, a chromatic layer and a monochrome mask for the non-picture component, wherein the chromatic layer is constructed by substituting a spatially corresponding rectangle for each character in the non-picture component;
compressing the non-picture component; and
saving the uncompressed picture component and the compressed non-picture component in memory so that the document image forms a recomposed image based on the uncompressed picture component and the compressed non-picture component.
15. The non-transitory computer-readable medium of claim 14 , wherein the background layer comprises a background color for each block in the non-picture component.
16. The non-transitory computer-readable medium of claim 14 , wherein the monochrome mask acts as a switch to control when a pixel in the recomposed image would be rendered based on the background and chromatic layers.
17. The non-transitory computer-readable medium of claim 14 , segmenting the document image into the picture component comprises identifying each picture in the document image based on one or more chromaticity changes.
18. The non-transitory computer-readable medium of claim 14 , wherein the spatially corresponding rectangle for each character in the non-picture component is created with a same color as found in the respective character.