| US 7,515,757 B2 | ||
| Method for managing storage space in a storage medium of a digital terminal for data storage according to a prioritized pixel transfer method | ||
| Gerd Mossakowski, Ahlen (Germany) | ||
| Assigned to T-Mobile Deutschland GmbH, Bern (Germany) | ||
| Appl. No. 10/520,134 PCT Filed Jul. 01, 2003, PCT No. PCT/DE03/02181 § 371(c)(1), (2), (4) Date Nov. 09, 2005, PCT Pub. No. WO2004/006186, PCT Pub. Date Jan. 15, 2004. |
||
| Claims priority of application No. 102 29 706 (DE), filed on Jul. 02, 2002. | ||
| Prior Publication US 2006/0161686 A1, Jul. 20, 2006 | ||
| Int. Cl. G06K 9/36 (2006.01) | ||
| U.S. Cl. 382—232 [375/240.01; 709/247] | 20 Claims |
| 1. A method for managing storage space in a storage medium of digital terminal equipment for data storage of images according
to a prioritized pixel transmission method, wherein each image is stored in a data file that consists of an array of individual
image pixels, wherein each pixel has a pixel value that describes the color or brightness information of the pixel, the method
comprising the following steps:
a. determining a priority value for each pixel of the array by calculating a pixel difference value based on the given pixel
value of the pixel in relation to the pixel values of a previously selected group of neighboring pixels, the priority values
indicating the relative importance of the respective pixels to the image;
b. grouping the pixels that are used for calculating the priority value into a pixel group;
c. sorting pixel groups of the image array based on their priority values;
d. saving multiple data files with pixel groups sorted by priority (P1, P2, . . . , Pn) on the storage medium;
e. selecting a lower priority threshold value (Pu) and an upper priority threshold value (Po), wherein the priority threshold
values indirectly indicate how much information content of a file is stored on the storage medium, the lower priority threshold
means that a greater number of pixel groups are available for reconstruction of the image, and the upper priority threshold
means that a fewer number of pixel groups are available for reconstruction of the image;
f. storing files in the form of their pixel groups having priority values between the highest priority (P1) and a priority corresponding to the selected lower priority threshold value (Pu) until the available storage space of the
storage medium has been filled;
g. increasing the lower priority threshold value (Pu) by one priority level;
h. deleting pixel groups with a lower priority than that of the current priority threshold value (Pu) on the storage medium
when additional storage space is needed on the storage medium to create freed storage space; and
i. using the freed storage space in the storage medium for storing further data.
|