Image encoding device and method

• US 20070053430A1
• Filed: 11/08/2006
• Published: 03/08/2007
• Est. Priority Date: 06/18/2004
• Status: Abandoned Application

• Current Assignee: Fujitsu Microelectronics Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Limited
• Inventors: Otsuka, Tatsushi, Tahira, Takahiko
• Application Number:
  US11/594,081
• Publication Number:
  US 20070053430A1
• Time in Patent Office: Days
• US Class Current: 375/240.40
• CPC Class Codes: H04N 19/102 characterised by the element, parameter or selection affected or controlled by the adaptive coding
• CPC Class Codes: H04N 19/127 Prioritisation of hardware or computational resources
• 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 19/17 the unit being an image region, e.g. an object
• CPC Class Codes: H04N 19/174 the region being a slice, e.g. a line of blocks or a group of blocks
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

An image encoding device for encoding the image data of one screen composed of a plurality of image slices that each correspond to pixels in horizontal arrays on the screen, comprising: a slice data selection unit for selecting the image data of a plurality of slices constituting the one screen in a specified slice order; and an encoded slice data output unit for outputting the data of the plurality of selected and encoded image slices to the outside in an order corresponding to the specified order but in a slice order different from the specified order.

Claims

1. An image encoding device for encoding the image data of one screen composed of a plurality of image slices that each correspond to pixels in horizontal arrays on the screen, comprising:

a slice data selection unit for selecting the image data of a plurality of slices constituting the one screen in a specified slice order; and

an encoded slice data output unit for outputting the data of the plurality of selected and encoded image slices to the outside in an order corresponding to the specified order but in a slice order different from the specified order.

2. The image encoding device according to claim 1, further comprising:

a selection order instruction unit for specifying the selection order of the image slice data according to an externally given mode signal.

3. The image encoding device according to claim 2, wherein

the selection order instruction unit specifies the selection order in such a way that the image slice data at the center of a screen can be selected first and then priority can be given to image data of slices close to the slice at the center.

4. The image encoding device according to claim 1, further comprising

a selection order instruction unit for analyzing input image data, detecting an area likely to be focused on in the input image data and specifying a selection order for the image slice data in such a way that image data of a slice in the area being focused on may be first selected and then priority may be given to slices close to the area being focused on.

5. The image encoding device according to claim 4, wherein the selection order instruction unit detects a plurality of areas likely to be focused on as the area being focused on and specifies the selection order for an alternate encoding of image data among a plurality of surrounding areas around the plurality of areas being focused on, including each of the plurality of areas being focused on in such a way that, for one of the plurality of surrounding areas, image slice data corresponding to the area being focused on may be placed first in the order and priority may be given to image data of slices close to the area being focused on.

6. The image encoding device according to claim 4 or 5, wherein

the selection order instruction unit can detect areas that are the color of the human body, areas that contain a mobile object image, or areas that contain many pieces of image data with a low/intermediate spatial frequency light as the area being focused on.

7. An image multi-encoding system provided with two image encoding devices in which one screen is divided into an upper area and a lower area and each of the two image encoding devices encodes image data in one of the two areas, wherein

each of the two image encoding devices selects image slice data in a direction the reversal of each other, starting with a slice that is on the boundary of and included in both of the two divided areas, and encodes the image data.

8. An image encoding method for encoding the image data of one screen that is composed of a plurality of slices corresponding to horizontal arrays of pixels on the screen, comprising:

selecting the image data of a plurality of slices constituting the one screen in a specified slice order; and

outputting the plurality of selected and encoded image slice data to the outside in an order corresponding to the specified order but in a slice order different from the specified order.

9. A computer-readable portable storage medium on which is recorded a program for enabling a computer to encode the image data of one screen that is composed of a plurality of slices corresponding to pixels in horizontal arrays on the screen, comprising:

selecting the image data of a plurality of slices constituting the one screen in a specified slice order; and

outputting the plurality of selected and encoded image slice data externally in an order corresponding to the specified order but in a slice order different from the specified order.

10. An image encoding device for encoding the image data of one screen composed of a plurality of slices corresponding to pixels in horizontal arrays on the screen, comprising:

a selection unit for selecting a slice with a large amount of encoded data from the plurality of slices as a slice to process with a higher priority than a slice with a small amount of encoded data; and

an encoding unit for encoding image data in the slice selection order.