Image data transmitting apparatus and method of controlling same

• US 7,013,041 B2
• Filed: 06/06/2002
• Issued: 03/14/2006
• Est. Priority Date: 06/25/2001
• Status: Expired due to Fees

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Miyamoto, Takashi
• Primary Examiner(s): Mancuso, Joseph
• Assistant Examiner(s): SHERALI, ISHRAT I
• Application Number:
  US10/162,686
• Publication Number:
  US 20020196971A1
• Time in Patent Office: 1,377 Days
• Field of Search: 382162-163, 382/166, 382/167, 382/305, 382/239, 382232-233, 382/237, 382/168, 358/1.9, 358/3.23, 358/518, 358/520, 358/523, 358/537, 358 115- 116, 345589-593, 345597-605, 455/412.1, 455/566, 455/550.1, 455/414, 4555561-5563, 715/764, 709/247, 709/216
• US Class Current: 382/166
• CPC Class Codes: G06T 9/005 Statistical coding, e.g. Huffman, run length coding

Abstract

The amount of data in an image file transmitted to a cellular telephone is reduced. To achieve this, the colors of pixels constituting an image represented by image data are specified by a color palette table. Color palettes representing colors that do not appear in the image are deleted from the color palette table. Since the amount of data in the color palette table contained in the image file is reduced, so is the amount of image data in the image file.

Claims

1. An image data transmitting apparatus comprising:

a calculation device for calculating frequency of appearance of the colors of pixels constituting an image represented by image data to be transmitted to an electronic device;

a deletion device for deleting, from a color palette table that includes a plurality of color palettes specifying colors of pixels constituting an image represented by image data, a color palette that corresponds to the color of a pixel whose frequency of appearance calculated by said calculation device is less than a threshold value;

a transmitting device for transmitting the color palette table, from which the color palette has been deleted, and the corresponding image data to the electronic device in a form associated with each other;

a determination device for determining whether the amount of data of the color palette table, from which the color palette has been deleted by said deletion device, and of the corresponding image data is greater than a receivable capacity of the electronic device; and

a compression device for compressing said corresponding image data in response to a determination by said determination device to the effect that the amount of data is greater than the receivable capacity.

2. A method of controlling an image data transmitting apparatus, comprising the steps of:

calculating frequency of appearance of the colors of pixels constituting an image represented by image data to transmitted to an electronic device;

deleting, from a color palette table that includes a plurality of color palettes specifying colors of pixels constituting an image represented by image data, a color palette that corresponds to the color of a pixel for which the calculated frequency of appearance is less than a threshold value;

transmitting the color palette table, from which the color palette has been deleted, and the corresponding image data to the electronic device in a form associated with each other;

determining whether the amount of data of the color palette table, from which the color palette has been deleted by said deletion device, and of the corresponding image data is greater than a receivable capacity of the electronic device; and

compressing said corresponding image data in response to a determination by said determination device to the effect that the amount of data is greater than the receivable capacity.