Source: http://www.google.com/patents/US5898794?dq=inventor:%22Arthur+R.+Hair%22&ei=VAy0Tsa4NYTl0QGQiqWiBA
Timestamp: 2016-07-28 19:25:43
Document Index: 502838611

Matched Legal Cases: ['art 24', 'art 24', 'art 25', 'art 26', 'art 30', 'art 21', 'art 21', 'art 21', 'art 30', 'art 22', 'art 30', 'art 30', 'art 21', 'art 21', 'art 21', 'art 21', 'art 30', 'art 21', 'art 21', 'art 22', 'art 30', 'art 22', 'art 23', 'art 30', 'art 23', 'art 23', 'art 23', 'art 30', 'art 30', 'art 21', 'art 21', 'art 24', 'art 21']

Patent US5898794 - Image compression method and image processing system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsDisclosed is an image processing system including an image input unit, an extraction unit, a plurality of compression process parts and a selection unit to compress a 1-frame image down to a less amount of color information. The image input unit takes in a plurality of frame images per frame. The extraction...http://www.google.com/patents/US5898794?utm_source=gb-gplus-sharePatent US5898794 - Image compression method and image processing systemAdvanced Patent SearchPublication numberUS5898794 APublication typeGrantApplication numberUS 08/878,201Publication dateApr 27, 1999Filing dateJun 18, 1997Priority dateNov 2, 1992Fee statusLapsedPublication number08878201, 878201, US 5898794 A, US 5898794A, US-A-5898794, US5898794 A, US5898794AInventorsSatoshi Sonohara, Shigeki Furuta, Hitoshi Matsumoto, Motoyuki MoritaOriginal AssigneeFujitsu LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (28), Non-Patent Citations (8), Referenced by (9), Classifications (12), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetImage compression method and image processing system
US 5898794 AAbstract
Disclosed is an image processing system including an image input unit, an extraction unit, a plurality of compression process parts and a selection unit to compress a 1-frame image down to a less amount of color information. The image input unit takes in a plurality of frame images per frame. The extraction unit extracts each of the taken-in frame images per unit area of a designated size. The plurality of compression process parts effects compression processes different from each other with respect to pels contained in each unit area. The selection unit selects one compression process part from the plurality of compression process parts for compressing the unit area of the designated size.
1. An image compression method of compressing a 1-frame image consisting of a plurality of pels each having color data of red, green and blue down to less color data quantity, said method comprising:inputting said 1-frame image included in a plurality of frame images; setting a designated size for subdividing said 1-frame image; extracting from said 1-frame image unit areas of said designated size; effecting compression processes which differ from each other with respect to pels contained in each unit area; selecting one compression process from said compression processes for compressing said unit areas of said designated size, having a compression rate of said color data quantity higher than other of said compression processes; and instructing said setting of said designated size to designate a smaller size to lower said compression rate if said compression processes can not be performed at all for said unit areas of said designated size, wherein said compression processes include monochrome processing by converting all colors of said pels contained in each unit area within said 1-frame image into a unit area representative color, in-frame reference processing by converting an original color of each pel contained in non-reference unit areas within said 1-frame image into an in-frame reference color of a corresponding pel contained in an in-frame unit area within said 1-frame image, and inter-frame reference processing by converting the original color of each pel contained in each unit area within said 1-frame image into an inter-frame reference color of a corresponding pel contained in an inter-frame unit area within another of said frame images. 2. The image compression method as set forth in claim 1, wherein said selection step is to perform said selecting process for said each unit area extracted in said extraction step.
3. The image compression method as set forth in claim 1, further comprising:a first comparing step of comparing colors of corresponding pels with each other in each unit area and one of said in-frame and inter-frame unit areas; and a second comparing step of comparing said unit area representative color with a predetermined color reference value. 4. The image compression method as set forth in claim 3, wherein at least one of said in-frame and inter-frame reference processing steps are used if a color difference between said corresponding pels in each unit area and the one of said in-frame unit and inter-frame unit areas falls within a predetermined value in said first comparing step.
6. The image compression method as set forth in claim 1,wherein said plurality of compression processes further include a multi-color unit area processing equally subdividing each unit area containing said plurality of pels into equally subdivided unit areas and converting said equally subdivided unit areas to assume different colors, and a monochrome decode processing unequally subdividing each unit area containing said plurality of pels into unequally subdivided unit areas and converting said unequally subdivided unit areas to assume one color, and wherein said selecting preferentially selects the one compression process exhibiting the image compression rate higher than other of said compression processes from said compression processes including said multi-color unit area processing and said monochrome decode processing. 7. The image compression method as set forth in claim 1, wherein said plurality of compression processing steps further include a first subsampling step of deleting said pels at a fixed interval among said pels of said unit area and a second subsampling step of extracting a subdivided unit area with no sharp color variation of said pel from said unit area and deleting some of said pels of said subdivided unit area, and said selection step is to preferentially select said step exhibiting a higher image compression rate from said steps including said first and second subsampling steps with respect to said unit area.
8. An image processing system for compressing a 1-frame image consisting of a plurality of pels each having color data of red, green and blue down to less color data quantity, comprising:an image input unit for inputting frame images, including said 1-frame image; an extraction unit for setting a designated size for subdividing said 1-frame image and for extracting from said 1-frame image unit areas of said designated size; a compression processing unit for effecting compression processes which differ from each other with respect to pels contained in each unit area; a selection unit for selecting one compression process from said compression processes for compressing said unit areas of said designated size, having a compression rate of said color data quantity higher than other of said compression processes; and an area change instruction unit for instructing said extraction unit to change said designated size to a smaller size to lower said compression rate if said compression processes can not be performed at all for said unit areas of said designated size, and wherein said compression processes include monochrome processing by converting all colors of said pels contained in each unit area within said 1-frame image into a unit area representative color, in-frame reference processing by converting an original color of each pel contained in non-reference unit areas within said 1-frame image into an in-frame reference color of a corresponding pel contained in an in-frame unit area within said 1-frame image, and inter-frame reference processing by converting the original color of each pel contained in each unit area within said 1-frame image into an inter-frame reference color of a corresponding pel contained in an inter-frame unit area within another of said frame images. 9. The image processing system as set forth in claim 8, wherein said selection unit selects each unit area extracted by said extraction unit.
10. The image processing system as set forth in claim 8, further comprising:a first comparing unit for comparing colors of corresponding pels with each other in each unit area and said in-frame and inter-frame unit areas; and a second comparing unit for comparing said unit area representative color with a predetermined color reference value. 11. The image processing system as set forth in claim 10, wherein at least one of said in-frame and inter-frame reference processing are used if a color difference between said corresponding pels in each unit area and said in-frame and inter-frame unit areas, respectively, falls within a predetermined value.
13. The image processing system as set forth in claim 8,wherein said plurality of compression processes further includemulti-color unit area processing equally subdividing each unit area containing said plurality of pels into equally subdivided unit areas and for converting said equally subdivided unit areas to assume different colors, and monochrome decode processing unequally subdividing each unit area containing said plurality of pels into unequally subdivided unit areas and for converting said unequally subdivided unit areas to assume one color, and wherein said selecting unit preferentially selects the one compression process exhibiting the image compression rate higher than other of said compression processes from said compression processes including said multi-color unit area processing and said monochrome decode processing. 14. The image processing system as set forth in claim 8,wherein said plurality of compression processes further include a first subsampling process for deleting said pels at a fixed interval among said pels of each unit area and a second subsampling process for extracting a subdivided unit area with no sharp color variation of said pels in each unit area and for deleting some of said pels of said subdivided unit area, and wherein said selection unit preferentially selects said one compression process exhibiting a higher image compression rate from said compression processes, including said first and second subsampling processes, with respect to each unit area. 15. An image compression method of compressing a 1-frame image consisting of a plurality of pels each having color data of red, green and blue down to less color data quantity, said method comprising:inputting said 1-frame image included in a plurality of frame images; extracting from said 1-frame image unit areas of a designated size; effecting compression processes which differ from each other with respect to pels contained in each unit area; and selecting one compression process of said compression processes for compressing said unit areas of said designated size, wherein said processes include monochrome processing by converting all colors of said pels contained in each unit area within said 1-frame image into a unit area representative color, in-frame reference processing by converting an original color of each pel contained in non-reference unit areas within said 1-frame image into an in-frame reference color of a corresponding pel contained in an in-frame unit area within said 1-frame image, and inter-frame reference processing by converting the original color of each pel contained in each unit area within said 1-frame image into an inter-frame reference color of a corresponding pel contained in an inter-frame unit area within another of said frame images. 16. A method of compressing image data representing frames of pels by reducing colors used by the pels, comprising:selecting a unit area size for processing unit areas in each frame; selecting a compression process having highest compression from amonga monochrome process of converting a color of each pel contained in each unit area within a current frame into a unit area representative color when the color of each pel in the unit area differs from the unit area representative color by no more than a first reference value, an in-frame reference process of converting a non-reference color of each pel contained in non-reference unit areas within the current frame into an in-frame reference color of a corresponding pel contained in an in-frame reference unit area within the current frame when the non-reference color and the in-frame reference color differ by no more than a second reference value, and an inter-frame reference process of converting the non-reference color of each pel contained in each unit area within all non-reference frames into an inter-frame reference color of a corresponding pel contained in an inter-frame reference unit area within a reference frame when the non-reference color and the inter-frame reference color differ by no more than a third reference value; repeating said selecting of the unit area size and the compression process using a smaller unit area when none of the monochrome, in-frame reference and inter-frame reference processes can be performed; and processing each unit area of the current frame using the unit area size selected and the compression process selected. 17. A storage medium storing a computer program for a computer to compress a 1-frame image consisting of a plurality of pels each having color data of red, green and blue down to less color data quantity, comprising:an input segment to input the 1-frame image included in a plurality of frame images; a size setting segment to set a designated size for subdividing the 1-frame image; an extraction segment to extract from the 1-frame image unit areas of the designated size; at least one compression segment to perform compression processes which differ from each other with respect to pels contained in each unit area, the compression processes includingmonochrome processing to convert all colors of the pels contained in each unit area within the 1-frame image into a unit area representative color, in-frame reference processing to convert an original color of each pel contained in non-reference unit areas within the 1-frame image into an in-frame reference color of a corresponding pel contained in an in-frame unit area within the 1-frame image, and inter-frame reference processing to convert the original color of each pel contained in each unit area within the 1-frame image into an inter-frame reference color of a corresponding pel contained in an inter-frame unit area within another of the frame images; a selection segment to select one compression process from the compression processes to compress the unit areas of the designated size, having a compression rate of the color data quantity higher than other of the compression processes; and a size reduction segment to designate a smaller size to lower the compression rate if the compression processes cannot be performed at all for the unit areas of the designated size. 18. A storage medium storing a computer program for a computer to compress a 1-frame image consisting of a plurality of pels each having color data of red, green and blue down to less color data quantity, comprising:an input segment to input the 1-frame image included in a plurality of frame images; an extraction segment to extract from the 1-frame image unit areas of a designated size; at least one compression segment to perform compression processes which differ from each other with respect to pels contained in each unit area, the compression processes includingmonochrome processing to convert all colors of the pels contained in each unit area within the 1-frame image into a unit area representative color, in-frame reference processing to convert an original color of each pel contained in non-reference unit areas within the 1-frame image into an in-frame reference color of a corresponding pel contained in an in-frame unit area within the 1-frame image, and inter-frame reference processing to convert the original color of each pel contained in each unit area within the 1-frame image into an inter-frame reference color of a corresponding pel contained in an inter-frame unit area within another of the frame images; and a selection segment to select one compression process of the compression processes to compress the unit areas of the designated size. 19. A storage medium storing a computer program for a computer to compress image data representing frames of pels by reducing colors used by the pels, comprising:a size selection segment to select a unit area size for processing unit areas in each frame; a process selection segment to select a compression process having highest compression from amonga monochrome process of converting a color of each pel contained in each unit area within a current frame into a unit area representative color when the color of each pel in the unit area differs from the unit area representative color by no more than a first reference value, an in-frame reference process of converting a non-reference color of each pel contained in non-reference unit areas within the current frame into an in-frame reference color of a corresponding pel contained in an in-frame reference unit area within the current frame when the non-reference color and the in-frame reference color differ by no more than a second reference value, and an inter-frame reference process of converting the non-reference color of each pel contained in each unit area within all non-reference frames into an inter-frame reference color of a corresponding pel contained in an inter-frame reference unit area within a reference frame when the non-reference color and the inter-frame reference color differ by no more than a third reference value; a resizing segment to repeat execution of said size and process selection segments using a smaller unit area when none of the monochrome, in-frame reference and inter-frame reference processes can be performed; and a process segment to process each unit area of the current frame using the unit area size selected and the compression process selected. Description
It is a primary object of the present invention, which has been devised in view of the points described above, to provide an image compression method and an image processing system for reducing an amount of color data of a 1-frame image.
FIG. 2 (a) is a view showing example of 8 pels�8 pels of a unit area;
FIG. 2 (b) is a view showing example of 8 pels�4 pels of a unit area;
FIG. 2 (c) is a view showing example of 4 pels�8 pels of a unit area;
FIG. 2 (d) is a view showing example of 4 pels�4 pels of a unit area;
FIG. 2 (e) is a view showing example of 4 pels�2 pels of a unit area;
FIG. 5 (a) is a view showing example of the reference unit area defined by 8 pels�8 pels;
FIG. 5 (b) is a view showing example of the nonreference unit area defined by 8 pels�8 pels;
An area size setting unit 17 and an area extraction unit 18 are connected to this image memory 15. The area size setting unit 17 sets size of a unit area to subdivide one of the plurality of frame images stored in the image memory 15 into a plurality of unit areas. The image takes, for instance, sizes of 8 pels�8 pels, 4 pels�4 pels, etc.
The area extraction unit 18 extracts each of the unit areas set from the image memory 15 by size set by the area setting unit 17. FIG. 2 shows examples of the pels in the extracted unit areas. The unit areas to be extracted are 8 pels�8 pels (FIG. 2(a)), 8 pels�4 pels (FIG. 2(b)), 4 pels�8 pels (FIG. 2(c)), 4 pels�4 pels (FIG. 2(d)) and 4 pels�2 pels (FIG. 2(e)).
<Construction of the Compression Process Unit 20>
The possible-to-take unit areas are, e.g., 8 pels�8 pels, 8 pels�4 pels, 4 pels�8 pels, 4 pels�4 pels and 4 pels�2 pels. All the colors are converted into one representative color.
FIG. 3 is an explanatory view showing the monochrome compression process. In an example shown in FIG. 3, the representative color is acquired in the following manner. A certain unit area is set to 8 pels�8 pels, wherein one pel is set to 2 bytes. In rectangular coordinates shown in FIG. 3, 5 bits (0-31) are provided on an R-axis, 5 bits are given to a G-axis, 5 bits are also given to a B-axis, and 1 bit is added, whereby one pel becomes 2 bytes. 8 pels�8 pels undergo mapping on the coordinates. The unit area is, as depicted in FIG. 3, divided equally into two segments by a central value of the longest axis of a spread of distribution in an RGB space. Further, the divided unit areas are subdivided equally into four segments of unit areas by a central value of the longest axis of the spread of distribution. The representative color is acquired by further repeating the subdivision process.
That is, a certain unit area is expressed in the same color as that in other unit areas within the same frame. Herein, the possible-to-take unit areas are, e.g., 8 pels�8 pels, 8 pels�4 pels, 4 pels�8 pels, 4 pels�4 pels and 4 pels�2 pels.
FIG. 5 shows one example of the in-frame reference compression. FIG. 5(a) illustrates the reference unit area 61 defined by 8 pels�8 pels. FIG. 5(b) illustrates the non-reference unit area 63a defined by 8 pels�8 pels. Herein, when comparing RGB of the pels in the two unit areas 61, 63, pels P11, P22, P44, P55, P77, P88 are the same. Pels P33, P66 are slightly different but fall within the reference value. The color of the non-reference unit area 63a is therefore managed in the same color as that of the reference unit area 61.
A monochrome decoding process part 24 subdivides the unit area extracted by the unit area extraction unit 18 and including a plurality of pels into a plurality of monochrome unit areas. FIG. 8 is an explanatory view showing a monochrome decode compression. In this example, the monochrome decoding process part 24 subdivides the unit area defined by 8 pels�8 pels into three segments of (4�4) unit areas and four segments of (2�2) unit areas. Each of seven subdivided unit areas is expressed in monochrome. If a partial color variation is conspicuous in the (8�8) unit area, this portion is subdivided into segments of (2�2) unit areas. This subdivision is intended for an expression in more colors.
A 4-color unit area process part 25 expresses the unit area defined by 4 pels�4 pels in four colors. FIG. 9 is an explanatory view showing a 4-color unit area compression.
A 8-color unit area process part 26 expresses the (8�4) unit area in eight colors. FIG. 10 is an explanatory view showing a 8-color unit area division compression.
monochrome 8 pels�8 pels, inter-frame reference 8 pels�8 pels, in-frame reference 8 pels�8 pels
monochrome 8 pels�4 pels, monochrome 4 pels�8 pels, inter-frame reference 8 pels�4 pels, inter-frame
reference 4 pels�8 pels, in-frame reference 8 pels�4 pels, in-frame reference 4 pels�8 pels
monochrome 4 pels�4 pels, inter-frame reference 4 pels�4 pels, in-frame reference 4 pels�4 pels
monochrome 4 pels�2 pels, inter-frame reference 4 pels�2 pels, in-frame reference 4 pels�2 pels
4-color 4 pels�4 pels
8-color 8 pels�8 pels
At the first onset, the compression process selection part 30a selects the monochrome process part 21. The area size setting unit 17 sets, e.g., 8 pels�8 pels as a size of the unit area to be extracted by the image extraction unit 18. Judged subsequently is whether or not the monochrome process part 21 is capable of expressing all the pels of the relevant unit area in one color (step 201). If the unit area defined by 8 pels�8 pels can be expressed in one color, the compression rate is set to 1/128. Then, the process of the relevant unit area is finished.
Next, if the monochrome process part 21 is incapable of expressing the (8�8) unit area in one color, the selection unit 30 judges whether that unit area is in the reference frame or not (step 202). If in the reference frame, the compression process selection part 30a selects the in-frame reference process part 22.
The compression rate is set to 1/128 in the actions from steps 201 through 204. If incapable of compressing the relevant unit area by the actions thereof, the area size change instruction part 30b instructs the area size setting unit 17 to change the size of the unit area to a size of 8 pels�4 pels.
The (8�4) unit area is therefore extracted as done in the extraction process of step 102 shown in FIG. 13. Next, the compression process selection part 30a chooses the monochrome process part 21. Judged is whether or not the monochrome process part 21 is capable of compressing the (8�4) unit area (step 205). If this monochrome process part 21 can compress the relevant unit area, this unit area is compressed down to the monochrome. The process of the relevant unit area is thus finished.
Whereas if this monochrome process part 21 can not compress the relevant unit area, the area size change instruction part 30b instructs the area size setting unit 17 to change the size of the relevant unit area to a (4�8) size. There is then judged whether or not the monochrome process part 21 is capable of compressing the (4�8) unit area (step 206). If this monochrome process part 21 is capable of compressing the relevant unit area, this unit area is compressed down to the monochrome. The process of the relevant unit area is thus ended.
If the in-frame reference process part 22 can not compress the relevant unit area, the area size change instruction part 30b gives an instruction to change the unit area to the (4�8) size. Judged is whether or not the in-frame reference process part 22 is capable of compressing a color of each pel of the relevant are down to a color of each pel of other unit areas within the same frame (step 209).
Whereas if the inter-frame reference process part 23 is incapable of compressing the relevant unit area, the area size change instruction part 30b works to change the unit area to the (4�8) size. Judged is whether or not the inter-frame reference process part 23 is capable of compressing a color of each pel of the relevant unit area down to a color of each pel of other unit areas within other frames (step 211). If the inter-frame reference process part 23 is capable of compressing the relevant unit area, this unit area is compressed. The process of the unit ares comes to an end. Whereas if the inter-frame reference process part 23 is incapable of compressing the relevant unit area, the action proceeds to step 211.
The compression rate is set to 1/64 in the actions of steps 205 through 211. If the relevant area can not be compressed by the actions thereof, the area size change instruction part 30b instructs the area size setting unit 17 to change the unit area to a (4�4) size. Hence, the unit area of 4 pels�4 pels is extracted in step 102 shown in FIG. 13. Next, the compression process selection part 30a selects the monochrome process part 21. Whether the monochrome process part 21 is capable of compressing the (4�4) unit area is judged (step 212).
Hereinafter, similarly if the (4�4) unit area can be compressed by any of the in-frame reference process (step 214) and the inter-frame reference process (step 215), the process is finished. The compression rate is set to 1/32 in the actions of steps 212 through 215.
Whereas if the process part 24 can not compress the relevant unit area, the unit area is changed to a (4�2) size. Whether the monochrome process part 21 is capable of compressing the relevant unit area or not is judged (step 217). If capable of compressing this unit area, the process comes to an end.
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2010REMIMaintenance fee reminder mailedApr 27, 2011LAPSLapse for failure to pay maintenance feesJun 14, 2011FPExpired due to failure to pay maintenance feeEffective date: 20110427RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services