Media editing system with adjustable source material compression

• US 5,577,190 A
• Filed: 07/05/1994
• Issued: 11/19/1996
• Est. Priority Date: 12/13/1991
• Status: Expired due to Term

• Current Assignee: Avid Technology Incorporated
• Original Assignee: Avid Technology Incorporated
• Inventors: Peters, Eric C.
• Primary Examiner(s): Powell, Mark R.
• Assistant Examiner(s): CHAUHAN, ULKA J
• Application Number:
  US08/270,442
• Time in Patent Office: 868 Days
• Field of Search: 395/159, 395/161, 395/600, 395/162-166, 360/14.1, 360/14.2, 360/14.3, 358/209, 358/210
• US Class Current: 345/501
• CPC Class Codes: G06F 3/0219 Special purpose keyboards
• CPC Class Codes: G06F 3/0362 with detection of 1D translations or rotations of an operating part of the device, e.g. scroll wheels, sliders, knobs, rollers or belts
• CPC Class Codes: G06F 3/038 Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
• CPC Class Codes: G06F 3/0489 using dedicated keyboard keys or combinations thereof
• CPC Class Codes: G06F 5/06 for changing the speed of data flow, i.e. speed regularising or timing, e.g. delay lines, FIFO buffers; over- or underrun control therefor G06F7/78 takes precedence
• CPC Class Codes: G06Q 10/10 Office automation; Time management
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/28 by using information signals recorded by the same method as the main recording G11B27/22 takes precedence
• CPC Class Codes: G11B 27/34 Indicating arrangements indicating means incorporated in magazine or cassette G11B23/046 and G11B23/0875; indicating measured values in general G01D
• CPC Class Codes: H04N 19/115 Selection of the code volume for a coding unit prior to coding
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/126 Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
• CPC Class Codes: H04N 19/146 Data rate or code amount at the encoder output
• CPC Class Codes: H04N 19/149 by estimating the code amount by means of a model, e.g. mathematical model or statistical model
• CPC Class Codes: H04N 19/15 by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer
• CPC Class Codes: H04N 19/154 Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion use of rate-distortion criteria H04N19/147
• CPC Class Codes: H04N 19/162 User input
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/18 the unit being a set of transform coefficients
• CPC Class Codes: H04N 19/42 characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence
• CPC Class Codes: H04N 19/60 : using transform coding
• CPC Class Codes: H04N 5/85 : on discs or drums
• CPC Class Codes: H04N 5/907 : using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 5/9264 : using transform coding
• CPC Class Codes: H04N 7/24 : Systems for the transmission of television signals using pulse code modulation H04N21/00 takes precedence
• CPC Class Codes: H04N 9/8042 : involving data reduction

Abstract

A media editing system for editing source material comprising digitizing apparatus for receiving and digitizing video and audio source material, the video source material including a sequence of images, each spanning both the horizontal and vertical display axes of the video source material. The editing system also includes computing apparatus including compression apparatus responsive to the digitizing apparatus. The compression apparatus compresses the images from the video source material. The computing apparatus determines if at least one of the compressed images occupies more than a target amount of storage and provides an indication if the at least one of the compressed images does occupy more than the target amount of storage. The compression apparatus is responsive to this indication to adjust its level of compression. The computing apparatus is also for manipulating the stored source material. The editing system further comprises a mass storage responsive to the computing apparatus to receive the compressed video source material and the audio source material, and output apparatus communicating with the computing apparatus to display the manipulated source material. In another general aspect, a data buffer that compensates for differences in data rates, between a storage device and an image compression processor, and a method and apparatus for the real time indexing of frames in a video data sequence.

Claims

1. Media editing system for editing source material comprising:

digitizing apparatus for receiving and digitizing video and audio source material, the video source material including a sequence of images, each spanning both the horizontal and vertical display axes of the video source material;

computing apparatus including compression apparatus responsive to the digitizing apparatus, the compression apparatus being for compressing the images from the video source material, wherein the computing apparatus is for determining if at least one of the compressed images occupies more than a target amount of storage and providing an indication if the at least one of the compressed images does occupy more than the target amount of storage, wherein the compression apparatus is responsive to the indication to adjust its level of compression, the computing apparatus further being for manipulating the stored source material;

mass storage responsive to the computing apparatus to receive the compressed video source material and the audio source material; and

output apparatus communicating with the computing apparatus for displaying the manipulated source material.

2. The media editing system of claim 1 wherein the compression apparatus is a JPEG compression apparatus and wherein the computing apparatus is for changing quantization tables to use in the JPEG compression apparatus to adjust the level of compression by the JPEG compression apparatus and to obtain a plurality of quantization tables.

3. The media editing system of claim 1 wherein the compression apparatus is a JPEG compression apparatus and wherein the computing apparatus is for compressing and decompressing at least one of the images according to a second of the quantization tables that is a scaling of a first of the quantization tables.

4. A method of editing video source material comprising:

digitizing video and audio source material, the video source material including a sequence of images each spanning both the horizontal and vertical display axes of the video source material,

compressing at least a first of the images digitized in the step of digitizing according to a first level of compression,

determining whether at least the first image occupies more than a target amount of storage after it is compressed in the step of compressing,

continuing to compress the video source material digitized in the step of digitizing according to a second level of compression, in response to a determination that the first image occupies more than the target amount of storage in the step of determining, wherein the second level of compression is different from the first level of compression, and

decompressing the video source material compressed in the steps of compressing and continuing to compress.

5. The method of claim 4 wherein the steps of compressing, continuing to compress, and decompressing operate according to the JPEG standard.

6. The method of claim 4 wherein the step of compressing operates according to a first quantization table, and wherein the step of continuing to compress operates according to a second quantization table that is a scaling of the first quantization table.

7. The method of claim 4 wherein the step of determining whether the first image occupies more than a target amount determines whether a frame occupies more than the target amount.

8. The method of claim 4 wherein the step of determining whether the first image occupies more than a target amount determines whether a field occupies more than the target amount.

9. Video processing apparatus for use with a media editing system for manipulating video and audio source material, which system includes mass storage and an output apparatus for displaying the manipulated source material, the video processing apparatus comprising:

an input for receiving digitized video source material, the video source material including a sequence of images, each spanning both the horizontal and vertical display axes of the video source material;

computing apparatus including compression apparatus responsive to the input, the compression apparatus being for compressing the images from the video source material, wherein the computing apparatus is for determining if at least one of the compressed images occupies more than a target amount of storage and providing an indication if the at least one of the compressed images does occupy more than the target amount of storage, wherein the compression apparatus is responsive to the indication to adjust its level of compression; and

an output for providing the compressed video source material to the mass storage.

10. The video processing apparatus of claim 9 wherein the compression apparatus is a JPEG compression apparatus and wherein the computing apparatus is for changing quantization tables to use in the JPEG compression apparatus to obtain a plurality of quantization tables and adjust compression by the compression apparatus.

11. The video processing apparatus of claim 9 wherein the compression apparatus is a JPEG compression apparatus and wherein the computing apparatus is for compressing and decompressing at least one of the images according to a second quantization table that is a scaling of a first quantization table.

12. The video processing apparatus of claim 9 further including digitzing apparatus for receiving and digitizing the video and audio source material, the digitizing apparatus having an output for providing the digitized video source material to the input of the compression apparatus.

13. The video processing apparatus of claim 12 wherein the compression apparatus is a JPEG compression apparatus and wherein the computing apparatus is for changing quantization tables to use in the JPEG compression apparatus to obtain a plurality of quantization tables and adjust compression by the compression apparatus.

14. Media editing system for editing source material comprising:

digitizing apparatus for receiving and digitizing video and audio source material, the video source material including a sequence of images, each spanning both the horizontal and vertical display axes of the video source material;

computing apparatus including compression apparatus responsive to the digitizing apparatus, the compression apparatus being for compressing the images from the video source material, wherein the computing apparatus is for determining if at least one of the compressed images occupies more than a target amount of storage and providing an indication if the at least one of the compressed images does occupy more than the target amount of storage, wherein the compression apparatus is responsive to the indication to adjust its level of compression, wherein the computing apparatus is also responsive to the indication to store compression level information regarding each adjustment in the level of compression, the computing apparatus further being for manipulating the stored source material;

mass storage responsive to the computing apparatus to receive the compressed video source material, the audio source material, and the information regarding each adjustment; and

output apparatus communicating with the computing apparatus for displaying the manipulated source material.

15. The media editing system of claim 14 wherein the compression apparatus is a JPEG compression apparatus and wherein the computing apparatus is for changing quantization tables to use in the JPEG compression apparatus to adjust the level of compression by the JPEG compression apparatus and to obtain the plurality of quantization tables.

16. The media editing system of claim 14 wherein the computing apparatus is for changing quantization tables to use in the compression apparatus, and wherein the computing apparatus is for compressing and decompressing at least one of the images according to a second of the quantization tables that is a scaling of a first of the quantization tables.

17. A method of editing video source material comprising:

digitizing video and audio source material, the video source material including a sequence of images each spanning both the horizontal and vertical display axes of the video source material,

compressing at least a first of the images digitized in the step of digitizing according to a first level of compression,

determining whether at least the first image occupies more than a target amount of storage after it is compressed in the step of compressing,

continuing to compress the video source material digitized in the step of digitizing according to a second level of compression, in response to a determination that the first image occupies more than the target amount of storage in the step of determining, wherein the second level of compression is different from the first level of compression, and

decompressing the video source material, compressed in the steps of compressing and continuing to compress, according to compression level information stored in response to the step of determining.

18. The method of claim 17 wherein the steps of compressing, continuing to compress, and decompressing operate according to the JPEG standard.

19. The method of claim 18 wherein the step of compressing operates according to a first quantization table, and wherein the step of continuing to compress operates according to a second quantization table that is a scaling of the first quantization table.