Image compression and expansion apparatus and pixel number...

Details Image compression and expansion apparatus and pixel number... Image compression and expansion apparatus and pixel number...

2005-04-19

2005-04-19

Wu, Jingge (Department: 2623)

Image analysis

Image compression or coding

Transform coding

C382S299000

Reexamination Certificate

active

06882752

ABSTRACT:
An image compression and expansion apparatus reproduces an expanded image corresponding to an original image from a reduced image. The original image data is comprised of approximately 1000×600 pixel values Pyx. A first matrix M1comprised of 64×64 pixel values Pyx is extracted from the original image data. Regarding the original image data arranged in the first matrix M1, an average value of 8×8 pixel values Pyx forming a block B1is obtained, and thus a second matrix M2is generated using the average value as a single pixel value. The pixel values of the second matrix M2is subject to two dimensional discrete cosine transformation to obtain a matrix MD comprised of 8×8 DCT coefficients. Expanded two dimensional inverse discrete cosine transformation is applied to the matrix MD to obtain a third matrix M3comprised of 64×64 pixel values. The expanded image data comprising the third matrix M3is transformed to the same coordinate system as the original image data and recorded on to the recording medium.

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