CN1119811A - Digital image format converter - Google Patents
Digital image format converter Download PDFInfo
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- CN1119811A CN1119811A CN 94116027 CN94116027A CN1119811A CN 1119811 A CN1119811 A CN 1119811A CN 94116027 CN94116027 CN 94116027 CN 94116027 A CN94116027 A CN 94116027A CN 1119811 A CN1119811 A CN 1119811A
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Abstract
The present invention relates to a digital image format converter used for implementing format conversion of decompressed digital image data delivered from a decompressor. It includes: an image interpolator used for implementing the on-the-fly interpolation and filtering treatment of said decompressed digital image data, and a colour space converter electrically connected to the said image interpolator used for transfering the digital image data delivered by the said image interpolator through the on-the-fly interpolation and filtering treatment from first colour space to second colour space so as to obtain an image with resolution representing original frame on the screen of a low-cost computer capable of gradually scanning.
Description
The present invention relates to a kind of conversion equipment, relate in particular to a kind of digital image format converter.
Because the rise of computer media, the audio-visual compression of digitlization (Digital Video/Audio Compression) becomes one of indispensable ring, generally speaking, the compression full dynamic image (Full Motion Video) and audio signal with high density compact disc (CompactDisc) as storing media, for the data transmission rate that meets CD and consider the program data length that it can hold, the full dynamic image of this compression is all with the resolution of SIF (Source InputFormat) form as picture, a picture is made of 352 * 240 or 352 * 288 pixels (pixel), and with Y, U, the V triad becomes the color of pixel, wherein, Y is briliancy (luminance) or brightness (brightness), represent the light and shade of a color, U, V is colourity (Chrominance) or aberration (Color difference), represent a certain primary colors composition (R in the color, G, B, RGB) deduct the briliancy of this color, wherein U represents B-Y (blue poor), and V represents R-Y (redness is poor).Promptly, the compressed digital video data that this kind is stored in the CD vertically reach horizontal sub-sampling (Subsampling) by the raw frames elder generation process of higher resolution usually, obtain the resolution of SIF form, afterwards, carry out compaction algorithms via the digital image compression rule again and get, therefore, on computer screen, present the resolution of this raw frames once more as hope, then compressed DID must be decompressed, carrying out digital image format conversion again, promptly is that Y, U, V element are vertically reached level take a sample again (Upsampling).
Figure 1 shows that a traditional digital picture decompresses and plays subsystem (subsystem), it comprises level processor 12 behind a digital image decoding device 11, the image, a picture frame memory 13, one image digitization/analog converter 14, a multiplexer 15 and a computer monitor 16; After the DID of compression is decompressed by digital image decoding device 11, after carrying out the digital image format conversion via level processor behind the image 12 and picture frame memory 13, transfer analog signal to via image digitization/analog converter 14 again, the module map image signal with carry out the screen display that multipath conversion exports computer monitor 16 to from the simulation picture signal A of VGA at multiplexer 15.
As shown in Figure 1, traditional is level processor 12 and picture frame memory 13 behind the image in order to combine digital image format conversion person, and its conversion regime is to serve as to handle basis (frame basis) with picture one by one, and its action is: receive the input picture, carry out back level processing (comprise amplification, dwindle, filtering or colour space transformation etc.), write picture buffer (framebuffer), exported by picture buffer.Because this traditional digital image format converter is to serve as to handle the basis with whole picture, therefore, this picture frame memory 13 must be class memories such as jumbo VRAM or DRAM, and the side is enough as picture buffer.Also just because of this traditional image format converting apparatus is to serve as to handle the basis with whole picture, so processing that level processor 12 need be looked after whole picture behind the image, therefore its required hardware circuit and storage space will be than with a scan line serving as handle the basis more complicated and huge, and also costliness is how for price.
Other has second kind of traditional digital image format converter, it replaces level processor 12 and picture frame memory 13 behind the image of aforementioned conventional with line buffer (Line Buffer) and simple access circuit, its decompression DID with a scan line is stored in the line buffer, provide double scan line output by line buffer again, so-called double scan line is meant two scan-line datas that have the same pixel data with this scan line that is stored in line buffer of output, because this second kind of conversion equipment directly exported two identical scan-line datas, and unmatchful each bar scan line processes, so its effect that is presented is the twice that the output picture is enlarged into compressed frames, but the resolution that on picture, does not show raw frames, cause the visual effect of the space virtual image (spatial Aliasing), the preferable image quality can't be provided.
Main purpose of the present invention is to provide a kind of digital image format converter, and it can reduce cost also can present the resolution of raw frames on screen.
The present invention is a kind of digital image format converter, it is in order to carry out format conversion to the decompression DID of decompressor output, it comprises: an image interpolation device, and it is line formula (on-the-fly) interpolation and a Filtering Processing to this decompression DID; One color space convertor is electrically connected on this image interpolation device, with the output of this image interpolation device through being that (DID of interpolation of on-the-fly) and Filtering Processing transfers second color space to by first color space to line; To finish the format conversion of this decompression DID.
Wherein this first color space comprises Y (luminance, briliancy, or brightness, brightness), three kinds of elements of U, V (chrominance, colourity, or Color difference, aberration); This second color space comprises R (red), G (green), three kinds of elements of B (indigo plant).
This image interpolation device comprises: a vertical interpolator device, with interpolation and the filtering action of carrying out this decompression DID vertical direction, export a kind of vertical interpolator DID; One horizontal interpolating device is electrically connected on this vertical interpolator device, with interpolation and the filtering action of carrying out this vertical interpolator DID horizontal direction.
This vertical interpolator device comprises: a Y element vertical interpolator device, with interpolation and the filtering action of carrying out the Y element vertical direction in this decompression DID; One U element vertical interpolator device is with interpolation and the filtering action of carrying out the U element vertical direction in this decompression DID; One V element vertical interpolator device is with interpolation and the filtering action of carrying out the V element vertical direction in this decompression digital picture data.
This Y element vertical interpolator device, U element vertical interpolator device, V element vertical interpolator device respectively comprise: a line storage (Line Memory), intersect (Interleave) access to the decompression DID of picture line; One vertical filter is electrically connected on this line storage, and it receives the picture line data of importing and exporting this line storage, and the two carries out vertical interpolator and filtering action to this; One multiplexer is electrically connected on this line storage and this vertical filter, with this horizontal interpolating device that exports to of this line storage of alternate selection and this vertical filter.
This multiplexer is when this line storage receives the picture line data, make the output of this vertical filter be sent to this horizontal interpolating device, and during this line storage does not have the picture line of reception data, the former picture line data that are stored in this line storage are output to this horizontal interpolating device.
This vertical filter is carried out linear interpolation one by one to each respective pixel data that two adjacent scanning lines are positioned at same horizontal level, thereby produces the scan line of an interpolation.
This intersection (Interleave) access is meant in the storage cycle of each address of this line storage, exports the former data that are stored in this address earlier, and the new data of restoring are in this address.
This U element vertical interpolator device and V element vertical interpolator device trip memory span are half of this Y element vertical interpolator device trip memory span.
This U element vertical interpolator device and V element vertical interpolator device trip storage access frequency are half of this Y element vertical interpolator device trip storage access frequency.
This horizontal interpolating device comprises: the horizontal interpolator of a Y element, with interpolation and the filtering action of carrying out the Y element horizontal direction in this vertical interpolator DID; The horizontal interpolator of one U element is with interpolation and the filtering action of carrying out the U element horizontal direction in this vertical interpolator DID; The horizontal interpolator of one V element is with interpolation and the filtering action of carrying out the V element horizontal direction in this vertical interpolator DID.
The horizontal interpolator of this Y element, the horizontal interpolator of U element and the horizontal interpolator of V element respectively comprise: a first order image latch, in order to pin pixel (pixel) data of this vertical interpolator device output; One second level image latch is electrically connected on this first order image latch, to the output of this first order image latch breech lock that is shifted; One horizontal filter is electrically connected on this first order image latch and this second level image latch, and the pixel data that the two latched to this is carried out filtering operation; One third level image latch is electrically connected on this horizontal filter, the pixel data that this horizontal filter the is exported output of taking a sample.
This horizontal filter produces the pixel of an interpolation between two adjacent pixels in the mode of linear interpolation.
Horizontal interpolator of this U element and the employed dot frequency of the horizontal interpolator of V element are half of the employed dot frequency of the horizontal interpolator of Y element.
The frequency of the employed sampled signal of this first and second grade image latch is half of frequency of the employed sampled signal of this third level image latch.
This decompressor and this digital image format converter are for being integrated among the same IC.
It is the digital image format conversion that decompresses of the interpolation filtering mode of line formula that apparatus of the present invention are to use, owing to carry out interpolation and Filtering Processing, so can on computer screen, present the resolution of raw frames, obtain good picture quality, because it is the processing mode of line formula that the present invention adopts, serve as to handle the basis with a scan line, again so its shared circuit is comparatively simplified, therefore apparatus of the present invention and decompressor can be integrated among a slice IC, reach cost-effective purpose.
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is conventional digital image decompressor and the schematic diagram of playing subsystem.
Fig. 2 is the block schematic diagram of digital image format converter of the present invention.
Fig. 3 is the block schematic diagram of vertical interpolator device of the present invention.
Fig. 4 is the sequential chart of vertical interpolator device of the present invention.
Fig. 5 is the scan line output schematic diagram of vertical interpolator device of the present invention.
Fig. 6 is the block schematic diagram of the horizontal interpolator of the present invention.
Fig. 7 is the sequential chart of the horizontal interpolator of the present invention.
Fig. 8 is the pixel output schematic diagram of the horizontal interpolator of the present invention.
See also Fig. 2, it has shown digital image format converter 22 for the block schematic diagram of digital image format converter of the present invention, Fig. 2, and it has comprised vertical interpolator device 22l, horizontal interpolating device 222 and color space converter 223; And vertical interpolator device 221 comprises Y element vertical interpolator device 2211, U element vertical interpolator device 2212 and V element vertical interpolator device 2213, and horizontal interpolating device 222 has comprised the horizontal interpolator 2221 of Y element, the horizontal interpolator 2222 of U element and the horizontal interpolator 2223 of V element again; Fig. 2 has also shown decompressor 21 in addition.
After the DID of compression is sent to and decompresses in the decompressor 21, deliver to again and carry out Y in the vertical interpolator device 221 respectively, U, the vertical interpolator of elements such as V and Filtering Processing, vertical interpolator DID after the vertical interpolator Filtering Processing is sent in the horizontal interpolating device 222 again and carries out Y, U, the horizontal interpolation and the Filtering Processing of three kinds of elements of V, to through DID vertical and horizontal interpolation and Filtering Processing deliver to color space (color space) transducer 223 with Y thereafter, U, the V element transfers R to, G, the B element is so finished the format conversion of decompression DID.
Be with traditional digital image format converter difference, the present invention is that the coupled computer screen scans the display mode of (progressive Scan) gradually, use one to be (on-the-fly) interpolation of line formula and filtering conversion regime as digital image format, so the required hardware circuit of digital image format converter of the present invention tradition serves as to handle that the hardware circuit of level processor 12 and picture frame memory 13 will come to such an extent that simplify behind the image on basis with whole picture, therefore, digital image format converter 22 of the present invention can be integrated among a slice IC20 with decompressor 21, as shown in Figure 2, saved the packing cost of line cost and IC.
Below the action of vertical interpolator device 221 of the present invention and horizontal interpolating device 222 done one describe in detail.See also Fig. 3, it is the circuit block diagram of Y vertical interpolator device 2211, U vertical interpolator device 2212 and V vertical interpolator device 2213, the vertical interpolator device of these three kinds of elements respectively comprises: a line storage 31, a vertical filter 32 and a multiplexer 33, line storage 31 is in order to deposit the DID of a scan line, 32 interpolation and filtering of carrying out two adjacent scanning lines data of vertical filter, 33 scan-line datas of exporting in order to alternate selection output line storage 31 and vertical filter 32 of multiplexer are to horizontal interpolating device 222.
Please consult Fig. 4 again, it has represented the action timing diagram of Y, U, V vertical interpolator device 2211,2212,2213, T when scan line of decompressor 21 inputs
DLLine storage 31 intersects (Interleave) access, so-called interleaving access is meant address former data of depositing in this address of elder generation's output in storage cycle of line storage 31, receive new data again, and as seen from Figure 3, this scan-line data is line of input memory 31 not only, also imports vertical filter 32 simultaneously, make and intersect on the output scan-line data with this line storage 31 and make interpolation and Filtering Processing, and multiplexer 33 is in T
DLSelect during this time and will deliver to horizontal interpolating device 222 through the output scanning line data after vertical filter 32 interpolations and the Filtering Processing, and not having input scan line data Ts when line storage 31 at decompressor 21,33 of multiplexers select that output is former to be stored in scan-line data in the line storage 31 to horizontal interpolating device 222.
Represented the output scanning line signal of vertical interpolator device 221 as Fig. 5, wherein, DL1-DLn is meant directly the scanning-line signal via line storage 31 outputs, and IL1-IL
(n-1)Then be scanning-line signal through vertical filter 32 interpolations and Filtering Processing.Wherein, 32 pairs of two adjacent scanning lines of vertical filter are positioned at each respective pixel data of same horizontal level and carry out linear interpolation one by one, thereby produce the scan line of an interpolation.In the scan-line data of a decompression, because the pixel data of Y element is two times of U, V two element pixel datas, so the line storage capacity of Y element vertical interpolator device is two times of line storage capacity of U, V element vertical interpolator device, and the line storage frequency of access of U, V element vertical interpolator device is half of line storage frequency of access of Y element vertical interpolator device.
Please consult Fig. 6 again, Y, U, the horizontal interpolator 2221,2222,2223 of V respectively comprise: first order pixel latch 61, second level pixel latch 62, horizontal filter 63 and third level pixel latch 64,61,62 pairs of pixel datas that vertical interpolator device 221 is imported of first and second grade pixel latch breech lock (Shifting latch) that is shifted, the data that latched by 63 pairs of these two-stage pixel latchs 61,62 of horizontal filter are carried out filtering operation again, and the output of horizontal filter 63 is done sampling output by third level pixel latch 64 again.The frequency of third level image latch 64 employed sampled signal CK3 is dot frequency (Pixel Rate), in order to the output of horizontal filter 63 is taken a sample.
See also Fig. 7, it is the horizontal interpolator 2221 of this element, 2222, the sequential chart of 2223 inner members, the frequency of first order latch 61 employed sampled signal CK1 is half of dot frequency, the frequency of second level latch 62 employed sampled signal CK2 is identical with the first order, just postpone a pixel period, both connect and carry out the displacement breech lock these, first, secondary latch 61, the data of 62 breech locks are carried out filtering operation by horizontal filter 63 again, its algorithm adopts first, secondary image latch 61, the linear interpolation of 62 pixel data, therefore filtered output is to form input pixel and alternately output of inter polated pixel, as shown in Figure 8.
Because of the horizontal resolution of compressed frames U, V element respectively is half of Y element, so the dot frequency of the horizontal interpolator of Y element is two times of dot frequency of U, the horizontal interpolator of V element.
Certainly, according to design of the present invention, those skilled in the art can also contrast and make all conversion, but they all belong within the scope of the present invention.
Claims (16)
1. a digital image format converter is carried out format conversion in order to the decompression DID that a decompressor is exported, and it is characterized in that comprising:
One image interpolation device is in order to being interpolation of line formula and Filtering Processing to this decompression DID;
One color space convertor is electrically connected on this image interpolation device, with the output of this image interpolation device through being that the DID of interpolation of line formula and Filtering Processing transfers second color space to by first color space; To finish the format conversion of this decompression DID.
2. digital image format converter as claimed in claim 1 is characterized in that described first color space comprises Y (briliancy), three kinds of elements of U, V (colourity); Described second color space comprises R (red), G (green), three kinds of elements of B (indigo plant).
3. digital image format converter as claimed in claim 1 is characterized in that described image interpolation device comprises:
One vertical interpolator device with interpolation and the filtering action of carrying out this decompression DID vertical direction, is exported a vertical interpolator DID;
One horizontal interpolating device is electrically connected on this vertical interpolator device, with interpolation and the filtering action of carrying out this vertical interpolator DID horizontal direction.
4. digital image format converter as claimed in claim 3 is characterized in that this vertical interpolator device comprises:
One Y element vertical interpolator device is with interpolation and the filtering action of carrying out the Y element vertical direction in this decompression DID;
One U element vertical interpolator device is with interpolation and the filtering action of carrying out the U element vertical direction in this decompression DID;
One V element vertical interpolator device is with interpolation and the filtering action of carrying out the V element vertical direction in this decompression DID.
5. digital image format converter as claimed in claim 4 is characterized in that described Y element vertical interpolator device, U element vertical interpolator device, V element vertical interpolator device respectively comprise:
One line storage carries out interleaving access to the decompression DID of picture line;
One vertical filter is electrically connected on this line storage, and it receives the picture line data of importing and exporting this line storage, and the two carries out vertical interpolator and filtering action to this;
One multiplexer is electrically connected on this line storage and this vertical filter, with this horizontal interpolating device that exports to of this line storage of alternate selection and this vertical filter.
6. digital image format converter as claimed in claim 5, it is characterized in that described multiplexer is when this line storage receives the picture line data, make the output of this vertical filter be sent to this horizontal interpolating device, and during this line storage does not have the picture line of reception data, the former picture line data that are stored in this line storage are output to this horizontal interpolating device.
7. digital image format converter as claimed in claim 5 is characterized in that described interleaving access is meant in the storage cycle of this each address of line storage, exports the former data that are stored in this address earlier, and the new data of restoring are in this address.
8. digital image format converter as claimed in claim 5, the line storage capacity that it is characterized in that this U element vertical interpolator device and V element vertical interpolator device is half of the line storage capacity of this Y element vertical interpolator device.
9. digital image format converter as claimed in claim 5, the line storage frequency of access that it is characterized in that this U element vertical interpolator device and V element vertical interpolator device is half of the line storage frequency of access of this Y element vertical interpolator device.
10. digital image format converter as claimed in claim 5 is characterized in that this vertical filter carries out linear interpolation one by one to each respective pixel data that two adjacent scanning lines are positioned at same horizontal level, thereby produces the scan line of an interpolation.
11. digital image format converter as claimed in claim 3 is characterized in that this horizontal interpolating device comprises:
The horizontal interpolator of one Y element is with interpolation and the filtering action of carrying out the Y element horizontal direction in this vertical interpolator DID;
The horizontal interpolator of one U element is with interpolation and the filtering action of carrying out the U element horizontal direction in this vertical interpolator DID;
The horizontal interpolator of one V element is with interpolation and the filtering action of carrying out the V element horizontal direction in this vertical interpolator DID.
12. digital image format converter as claimed in claim 11 is characterized in that the horizontal interpolator of this Y element, the horizontal interpolator of U element and the horizontal interpolator of V element respectively comprise:
One first order image latch is in order to latch the pixel information of this vertical interpolator device output;
One second level image latch is electrically connected on this first order image latch, to the output of this first order image latch breech lock that is shifted;
One horizontal filter is electrically connected on this first order image latch and this second level image latch, and the pixel data that the two latched to this is carried out filtering operation;
One third level image latch is electrically connected on this horizontal filter, the pixel data that this horizontal filter the is exported output of taking a sample.
13. digital image format converter as claimed in claim 12 is characterized in that this horizontal filter produces the pixel of an interpolation in the mode of linear interpolation between two adjacent pixels.
14. digital image format converter as claimed in claim 12 is characterized in that horizontal interpolator of U element and the employed dot frequency of the horizontal interpolator of V element are half of the employed dot frequency of the horizontal interpolator of Y element.
15. digital image format converter as claimed in claim 12, the frequency of the employed sampled signal of this first and second grade image latch are half of frequency of the employed sampled signal of this third level image latch.
16. digital image format converter as claimed in claim 1 is characterized in that this decompressor and this digital image format converter are for being integrated in among a slice IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94116027A CN1067830C (en) | 1994-09-26 | 1994-09-26 | Digital image format converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94116027A CN1067830C (en) | 1994-09-26 | 1994-09-26 | Digital image format converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1119811A true CN1119811A (en) | 1996-04-03 |
| CN1067830C CN1067830C (en) | 2001-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94116027A Expired - Lifetime CN1067830C (en) | 1994-09-26 | 1994-09-26 | Digital image format converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1067830C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101317464B (en) * | 2005-09-14 | 2010-12-08 | Rg布赖特股份有限公司 | Image enhancement and compression |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1025405C (en) * | 1990-01-09 | 1994-07-06 | Rca许可公司 | Digital interpolation circuitry |
| JP2585957B2 (en) * | 1992-08-18 | 1997-02-26 | 富士通株式会社 | Video data conversion processing device and information processing device having video data conversion device |
| CN1130649C (en) * | 1994-08-26 | 2003-12-10 | 联华电子股份有限公司 | Two dimensional conversion device and method for image recombination device |
-
1994
- 1994-09-26 CN CN94116027A patent/CN1067830C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101317464B (en) * | 2005-09-14 | 2010-12-08 | Rg布赖特股份有限公司 | Image enhancement and compression |
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| Publication number | Publication date |
|---|---|
| CN1067830C (en) | 2001-06-27 |
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