Image processing apparatus and image processing method

• US 20070286518A1
• Filed: 05/22/2007
• Published: 12/13/2007
• Est. Priority Date: 06/08/2006
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Shimizu, Noritaka, Mitsutake, Toshikazu
• Application Number:
  US11/802,302
• Publication Number:
  US 20070286518A1
• Time in Patent Office: Days
• US Class Current: 382/256
• CPC Class Codes: H04N 19/117 Filters, e.g. for pre-processing or post-processing sub-band filter banks H04N19/635
• CPC Class Codes: H04N 19/156 Availability of hardware or computational resources, e.g. encoding based on power-saving criteria
• CPC Class Codes: H04N 19/423 characterised by memory arrangements H04N19/433 takes precedence

Abstract

An image processing apparatus includes a compressed image data memory, an image expansion unit, an expanded image data memory, a boundary image data memory, an image resizing unit, and a control unit. The control unit determines an area to be expanded by the image expansion unit based on a capacity of the expanded image data memory and a capacity of the boundary image data memory. The control unit determines a size of the area to be expanded by the image expansion unit, so that a size of image data obtained by expanding compressed image data corresponded to the area determined by the control unit is less than or equal to the capacity of the expanded image data memory, and less than or equal to the capacity of the boundary image data memory.

Claims

1. An image processing apparatus, comprising:

a compressed image data memory which stores compressed image data;

an image expansion unit which expands the compressed image data read from the compressed image data memory for each area configuring one portion of an image;

an expanded image data memory which stores image data corresponded to an area expanded by the image expansion unit;

a boundary image data memory which stores boundary image data of an area adjacent to an area corresponded to the image data stored in the expanded image data memory;

an image resizing unit which changes a size of an image of an area corresponded to the image data read from the expanded image data memory; and

a control unit which determines an area to be expanded by the image expansion unit, based on a capacity of the expanded image data memory and a capacity of the boundary image data memory,

wherein the control unit determines a size of the area to be expanded by the image expansion unit, so that a size of image data obtained by expanding compressed image data corresponded to the area determined by the control unit is less than or equal to the capacity of the expanded image data memory, and less than or equal to the capacity of the boundary image data memory.

2. The image processing apparatus according to claim 1, wherein the image resizing unit changes the size of the image of the area corresponded to the image data read from the expanded image data memory, based on the image data read from the expanded image data memory and the boundary image data read from the boundary image data memory.

3. The image processing apparatus according to claim 2, wherein the image resizing unit calculates resized image data by an interpolation calculation, based on the image data read from the expanded image data memory and the boundary image data read from the boundary image data memory.

4. An image processing apparatus, comprising:

a compressed image data memory which stores compressed image data;

an image expansion unit which expands the compressed image data read from the compressed image data memory for each area configuring one portion of an image, and having a width identical to a width of the image;

an expanded image data memory which stores the image data expanded by the image expansion unit;

an image resizing unit which changes a size of an image of an area corresponded to the image data read from the expanded image data memory; and

a control unit which determines an area to be expanded by the image expansion unit and an output address of the image expansion unit, based on a capacity of the expanded image data memory,

wherein the expanded image data memory stores boundary image data of a first area adjacent to a second area corresponded to the image data stored in the expanded image data memory; and

wherein the control unit determines a size of the area to be expanded by the image expansion unit, so that a size of image data obtained by expanding compressed image data corresponded to the area determined by the control unit is less than or equal to the capacity of the expanded image data memory.

5. The image processing apparatus according to claim 4, wherein when the image resizing unit changes a size of an image of the second area based on the boundary image data, the control unit sets the output address of the image expansion unit as an address immediately following the boundary image data.

6. The image processing apparatus according to claim 5, wherein when the image resizing unit changes the size of the image of the second area based on the boundary image data, the control unit sets an input address of the image resizing unit as an initial address of image data of the second area.

7. The image processing apparatus according to claim 4, wherein the expanded image data memory is a ring buffer.

8. An image processing method, comprising:

determining a size of an area configuring one portion of an image so that the size of the area is less than or equal to a capacity of an expanded image data memory which stores image data obtained by expanding compressed image data of a prescribed area, and is less than or equal to a capacity of a boundary image data memory which stores boundary image data of an area adjacent to an area corresponded to the image data stored in the expanded image data memory;

expanding compressed image data of the determined area;

changing a size of an image of an area corresponded to the expanded image data; and

storing boundary image data adjacent to another area of the expanded image data in the boundary image data memory.

9. An image processing method, comprising:

determining a size of an area configuring one portion of an image, and having a width identical to a width of the image, so that the size of the area is less than or equal to a capacity of an expanded image data memory which stores image data obtained by expanding compressed image data of a prescribed area;

expanding compressed image data corresponded to the determined area;

changing a size of an image of the area corresponded to the expanded image data; and

determining a next area to be expanded, and an output address to the expanded image data memory of image data obtained by expanding compressed image data of the next area based on the capacity of the expanded image data memory.