Method of sequencing image data inside memory of optical scanning device
View Patent ↗An image data sequencing method for a memory unit inside an optical scanning device. The image data sequencing method is particularly suitable for scanning a line of pixels with each pixel comprising a plurality of primary colors. The image data sequencing method involves scanning a line of pixels to obtain the data for a primary or secondary color. The pixels within the scan line are subdivided into groups. A storage space is reserved both before and after the address space inside the memory unit for holding the scanned primary or secondary color data so that all the primary or secondary color data constituting a pixel are in a fixed sequence next to each other inside the memory unit. When all the primary or secondary color data of pixels within a group are secured, the group of data is released from the memory unit.
1. A method, comprising:
scanning a portion of an image by a plurality of sensors;
storing, into a memory, pixel data associated with the scanned portion of the image, wherein the pixel data is stored as at least two groups of pixel data comprising a first group of pixel data and a second group of pixel data; and
transferring, from the memory, the first group of pixel data after the first group of pixel data is completely stored into the memory and the second group of pixel data is partially stored into the memory.
2. The method of claim 1 , wherein scanning the portion of the image includes sequentially scanning the portion of the image by the plurality of sensors, spaced apart from each other, to obtain the first group of pixel data and the second group of pixel data.
3. The method of claim 1 , wherein scanning the portion of the image includes alternately scanning a first group of pixels associated with the first group of pixel data and scanning a second group of pixels associated with the second group of pixel data.
4. The method of claim 3 , wherein the alternately scanned pixels comprise a set of even numbered pixels and a set of odd numbered pixels that are sequentially scanned from a first scan line of the image.
5. The method of claim 3 , wherein the alternately scanned pixels comprise a set of even numbered pixels and a set of odd numbered pixels that are simultaneously scanned from two scan lines of the image.
6. The method of claim 1 , wherein storing the pixel data comprises storing the pixel data in a fixed sequence prior to transferring the at least one of the groups of pixel data.
7. The method of claim 1 , wherein the scanned portion of the image comprises a first scan line associated with the first group of pixel data, and wherein the scanned portion of the image further comprises a second scan line associated with the second group of pixel data.
8. A method, comprising:
scanning a first portion of a scan line by a plurality of spaced-apart sensors;
storing a first group of pixel data in a memory, wherein the first group of pixel data is scanned from the first portion;
reserving storage space in the memory in front of and behind an address space of the first group of pixel data;
scanning a second portion of the scan line with one or more of the plurality of spaced-apart sensors;
storing a second group of pixel data in the memory together with the first group of pixel data, wherein the second group of pixel data is scanned from the first portion; and
transmitting the first group of pixel data and the second group of pixel data out of the memory after each of the plurality of spaced-apart sensors scan the first portion of the scan line and before the second portion has been scanned by each of the plurality of spaced-apart sensors.
9. The method of claim 8 , further comprising transmitting pixel data associated with the second portion of the scan line after each of the plurality of spaced-apart sensors scan the second portion of the scan line.
10. The method of claim 8 wherein storing the second group of pixel data includes storing at least one pixel data from the second group of pixel data in the storage space behind the address space.
11. The method of claim 10 , further comprising:
storing a third group of pixel data in the memory, wherein the third group of pixel data is scanned from the first portion, and wherein at least one pixel data from the third group of pixel data is stored in the storage space in front of the address space.
12. The method of claim 8 , wherein the first portion of the scan line comprises odd numbered pixels, and wherein the second portion of the scan line comprises even numbered pixels.
13. The method of claim 8 , wherein the plurality of spaced-apart sensors comprise a first sensor and a second sensor, wherein the first sensor scans the first group of pixel data, and wherein the second sensor scans the second group of pixel data.
14. An apparatus, comprising:
means for scanning at least one scan line of a document, wherein the means for scanning comprises linear sensors or staggered sensors;
means for saving a first group of pixel data associated with the at least one scan line;
means for reserving storage space in front of and behind an address space of the first group of pixel data;
means for saving a second group of pixel data together with the first group of pixel data, wherein the second group of pixel data is associated with the at least one scan line; and
means for transmitting the first and second groups of pixel data after the means for scanning scans the at least one scan line.
15. The apparatus of claim 14 , wherein the means for scanning is configured to sequentially scan the at least one scan line to generate the first and second groups of pixel data.
16. The apparatus of claim 14 , wherein the means for scanning comprises means for scanning a first portion of a scan line and means for scanning a second portion of the scan line, and wherein the first group of pixel data and the second group of pixel data are transmitted before the second portion of the scan line has been scanned.
17. The apparatus of claim 16 , wherein the second portion of the scan line is scanned after the first portion of the scan line.
18. The apparatus of claim 17 , wherein the first portion of the scan line comprises even numbered pixels, and wherein the second portion of the scan line comprises odd numbered pixels.
19. The apparatus of claim 16 , wherein the first portion of the scan line and the second portion of the scan line are scanned by different sensors.
20. The apparatus of claim 19 , wherein the different sensors are spaced apart from each other by a number of scan lines, and wherein the second group of pixel data is saved after the number of scan lines are scanned.