Image processing device for displaying an image on a display
View Patent ↗A compression format identifying unit identifies the compression format of image data stored in a main memory. A transfer function determining unit determines a transfer function in accordance with the compression format of a tile image thus identified. A convolution operation unit subjects a modification request signal and the transfer function thus determined to convolution operation so as to generate a modification direction signal. A read ahead processor reads a tile image from the main memory using the modification request signal, decodes the image, and writes the decoded image in a buffer memory. A display image processor generates a display image using the modification direction signal.
1. An image processing device for displaying an image on a display, comprising:
a storage device operative to store image data including at least one compressed tile image for each of different resolutions;
an identifying unit operative to identify the compression format of the image data stored in the storage device;
a transfer function determining unit operative to determine a transfer function in accordance with the compression format of the tile image thus identified;
an acknowledging unit operative to acknowledge a modification request signal requesting modification of a display image displayed on the display;
a convolution operation unit operative to subject the modification request signal and the transfer function thus determined to convolution operation so as to generate a modification direction signal;
a read ahead processor operative to read a tile image from the storage device using the modification request signal and decode the image thus read; and
a display image processor operative to generate a display image using the modification direction signal.
2. The image processing device according to claim 1 , further comprising:
a maximum speed setting unit operative to set a maximum value of a speed with which to modify a display image in accordance with the identified compression format of the image data.
3. The image processing device according to claim 2 , wherein
the maximum speed setting unit ensures that the maximum value of the speed in the direction reducing a display image is smaller than the maximum value of the speed in the direction enlarging.
4. The image processing device according to claim 1 , wherein
the transfer function determining unit determines a transfer function based on attribution information of the tile image.
5. The image processing device according to claim 1 , wherein
the storage device stores a plurality of sets of image data defined in different coordinate systems, and
when the display image processor switches a tile image used to generate a display image to a tile image in the image data defined in another coordinate system, the convolution operation unit converts a modification request signal before switching into a modification request signal addressing the image data in said another coordinate system so as to generate a modification direction signal using the modification request signal obtained by the conversion.
6. An apparatus, comprising:
a micro-processing system executing a computer program, which causes the system to perform actions, comprising:
identifying a compression format of image data stored in a storage device and including at least one tile image for each of different resolutions;
determining a transfer function in accordance with the compression format of the tile image thus identified;
acknowledging a modification request signal requesting modification of a display image displayed on the display;
subjecting the modification request signal and the transfer function thus determined to convolution operation so as to generate a modification direction signal;
reading a tile image from the storage device using the modification request signal and decode the image thus read; and
generating a display image using the modification direction signal.
7. A non-transitory, computer readable recording medium encoded with a program, comprising:
a module operative to identify a compression format of image data stored in a storage device and including at least one tile image for each of different resolutions;
a module operative to determine a transfer function in accordance with the compression format of the tile image thus identified;
a module operative to acknowledge a modification request signal requesting modification of a display image displayed on the display;
a module operative to subject the modification request signal and the transfer function thus determined to convolution operation so as to generate a modification direction signal;
a module operative to read a tile image from the storage device using the modification request signal and decode the image thus read; and
a display image processor operative to generate a display image using the modification direction signal.