This study computes the two-dimensional DCT of 8-by-8 blocks in an input image, dismisses all but 10 of the DCT coefficients in each block, and afterwards reconstructs the image using the two-dimensional inverse DCT of each block." Transform matrices are used in the computing process.
This main objective of this work is to compress an image/video using the Discrete Cosine Transform (DCT). Naturally, JPEG image compression algorithm uses DCT to compress images. When the DCT is computed, the image is split into 8x8 or 16x16 blocks whereas in videos, frames will be considered.
As a result of these steps, the DCT coefficients are then quantized, coded, and then sent. As soon as the quantized DCT coefficients are decoded, the JPEG receiver (or JPEG file reader) computes each block's two-dimensional inverse DCT, and then combines the blocks into a single image.
he values of several of the DCT coefficients for common images are close to zero. In the absence of these coefficients, the image reconstruction may be done without compromising its quality in any way.
Keywords: Discrete Cosine Transform, Image Compression, 2-D Inverse DCT, Image Reconstruction
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