Generation of reconstructed image data based on moved distance and tilt of slice data

• US 7,263,212 B2
• Filed: 09/08/2003
• Issued: 08/28/2007
• Est. Priority Date: 09/18/2002
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kawabe, Shigeru
• Primary Examiner(s): PATEL, KANJIBHAI B
• Application Number:
  US10/656,261
• Publication Number:
  US 20040052407A1
• Time in Patent Office: 1,450 Days
• Field of Search: 382/116, 382/124, 382/126, 382/289, 382/294, 713/186, 348/308
• US Class Current: 382/124
• CPC Class Codes: G06V 40/1335 Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement

Abstract

An image processing apparatus is capable of generating distortion-free accurate image data. The image processing apparatus has an image entering unit, an image processor, and a memory. Slice data read by the image entering unit is stored in the memory. The image processor determines whether the slice data stored in the memory is of significance or not. Then, the image processor calculates a moved distance and tilt of the slice data that has been detected as being of significance, and calculates positional coordinates of a reconstructed image area to which the slice data is to be projected, based on the moved distance and tilt of the slice data which have been calculated, and generates reconstructed image data. The generated reconstructed image data is stored in the memory.

Claims

1. An image processing apparatus comprising:

image entering means for reading slice data;

image processing means for being supplied with slice data read by said image entering means and processing the supplied slice data into reconstructed image data; and

memory means for storing data;

said memory means comprising;

slice data storage means for storing slice data supplied to said image processing means; and

reconstructed image data storage means for storing reconstructed image data produced by said image processing means;

said image processing means comprising;

significance detecting means for determining whether the slice data stored in said slice data storage means is of significance or not;

moved distance/tilt calculating means for calculating a moved distance and tilt of the slice data that has been detected as being of significance by said significance detecting means; and

reconstructed image data generating means for calculating positional coordinates of a reconstructed image area to which said slice data is to be projected, based on the moved distance and tilt of the slice data which has been calculated by said moved distance/tilt calculating means, and generating reconstructed image data.

2. An image processing apparatus according to claim 1, wherein said image processing means comprises means for starting processing the slice data if the slice data is determined to be of significance by said significance detecting means, and ending processing the slice data if the slice data is determined to be of no significance by said significance detecting means.

3. An image processing apparatus according to claim 1, wherein said moved distance/tilt calculating means comprises means for calculating an overall moved distance and tilt of the slice data by determining relative positions of a plurality of moved distance detecting windows provided for the slice data.

4. An image processing apparatus according to claim 1, wherein said reconstructed image data generating means comprises means for dividing each pixel of the slice data into fragments at a ratio of occupied areas with respect to a maximum of four pixels of said reconstructed image area onto which each pixel of the slice data is to be projected, and distributing the divided fragments to the pixels of said reconstructed image area, thereby generating the reconstructed image data.

5. An image processing apparatus according to claim 1, wherein said image entering means comprises a fingerprint reading sensor.

6. An image processing apparatus according to claim 1, wherein said image entering means comprises a sensor for use with a hand scanner.

7. An image processing apparatus according to claim 1, wherein said image entering means comprises a line sensor.

8. A method of processing an image, comprising the steps of:

storing slice data read by an image entering unit;

detecting significance of the stored slice data;

calculating a moved distance and tilt of the slice data which has been detected as being of significance;

calculating positional coordinates of a reconstructed image area to which said slice data is to be projected, based on the moved distance and tilt of the slice data which have been calculated, and generating reconstructed image data; and

storing the generated reconstructed image data.

9. A computer-readable medium encoded with a computer program enabling a computer to process an image, computer-readable medium comprising:

a first instruction set enabling the computer to store slice data read by an image entering unit;

a second instruction set enabling the computer to detect a significance of the stored slice data;

a third instruction set enabling the computer to calculate a moved distance and tilt of the slice data which has been detected as being of significance;

a fourth instruction set enabling the computer to calculate positional coordinates of a reconstructed image area to which said slice data is to be projected, based on the moved distance and tilt of the slice data which have been calculated, and to generate a reconstructed image data; and

a fifth instruction set enabling the computer to store the generated reconstructed image data in a memory.