Blemish detection sytem and method using recursion

1. A blemish detecting system, comprising:

an image capturing module comprising an image sensor configured for capturing an image, the image having a plurality of pixels;

a brightness calculating module configured for calculating the brightness values of the pixels;

a blemish detection module configured for assigning a serial number to each of the pixels according to the locations of the pixels, scanning the pixels according to a first sequence, marking the pixel of which the brightness value is less than a predetermined brightness value as a blemish, only scanning the pixels adjacent to the blemish according to a second sequence, marking a particular pixel which is adjacent to the blemish and the brightness value of which is less than the predetermined brightness value as a new blemish, and then making a recursion to determine whether pixels adjacent to the new blemish are blemishes;

a storage module configured for storing the serial numbers of the scanned pixels, wherein if the serial numbers of the pixels are stored in the storage module, the blemish detection module does not scan the scanned pixels for a second time; and

a processor, wherein the brightness calculating module and the blemish detection module are computerized instructions and executed by the processor.

2. The blemish detecting system of claim 1 , wherein the first sequence is from upwards line to downwards line, and from leftwards pixel to rightwards pixel within each line.

3. The blemish detecting system of claim 1 , wherein the second sequence is from upwards line to downwards line, and from leftwards pixel to rightwards pixel within each line.

4. The blemish detecting system of claim 1 , wherein the image capturing module and the storage module are hardware.

5. The blemish detecting system of claim 4 , wherein the image capturing module is a camera, and the storage module is a flash memory.

6. A blemish detecting method executed by the blemish detecting system of claim 1 , comprising:

capturing an image using the image capturing module, and the image comprising a plurality of pixels;

assigning a serial number to each of the pixels according to the locations of the pixels using the blemish detecting module;

calculating the brightness values of the pixels using the brightness calculating module;

scanning the pixels that have not been scanned according to a first sequence using the blemish detecting module, and storing the serial numbers of the scanned pixels in the storage module;

comparing the brightness values of the scanned pixels with a predetermined brightness value using the blemish detecting module, and marking the particular pixel of which the brightness value is less than the predetermined brightness value as a blemish using the blemish detecting module;

only scanning all of the pixels that are adjacent to the blemish and have not been scanned according to a second sequence using the blemish detecting module;

storing the serial numbers of the scanned pixels adjacent to the blemish in the storage module;

comparing the brightness value of the scanned pixels with the predetermined brightness value using the blemish detecting module;

if there is at least one pixel which is adjacent to the blemish and the brightness value of which is less than the predetermined brightness value, marking the at least one pixel as new blemish using the blemish detecting module;

only scanning all of the pixels which are adjacent to each of the new blemish and have not been scanned according to the second sequence using the blemish detecting module; and

making a recursion to determine whether pixels adjacent to the new blemish are blemishes.

7. The blemish detecting method of claim 6 , wherein the first sequence is from upwards line to downwards line, and from leftwards pixel to rightwards pixel within each line.

8. The blemish detecting method of claim 6 , wherein the second sequence is from upwards line to downwards line, and from leftwards pixel to rightwards pixel within each line.