Image compression using the JPEG standard requires a series of steps, some of which are: Designed to harness the limits of the human eye. Especially the human eye. A change in brightness instead of a color change. SOC401 Final Term Past Paper 2021 So, starting with the image encoded as For the luminance and chrominance components, the first step is to average the chrominance values on a 2 x 2 pixel square. This reduces the size of the chromatography information by a factor of four.
SOC401 Final Term Past Paper 2021
All original brightness information. The result is a significant degree of unobtrusive pressure. Image quality loss.
The next step is to split the image into 8×8 pixel blocks and compress the information. SOC401 Final Term Past Paper 2021 Each block is a unit. It does this by applying a mathematical technique known as discrete cosine transform, the details of which need not concern us here. The important point is that this transformation converts the original eight-by-eight block into another block whose entries mirror the original’s pixels.
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The blocks are related to each other rather than to the actual pixel values. Within this new block, values less than a
the default thresholds are then replaced by zeros, demonstrating that the changes are represented by them
The values are too subtle to be recognized by the human eye. SOC401 Final Term Past Paper 2021 For example, if the original block contained a Checkerboard pattern, the new block can reflect a uniform medium color. (A typical 8 x 8-pixel Introduction to The block would represent a very small square in the image that the human eye would not see look checkerboard anyway.)
At this point, the more traditional run-length encoding, relative encoding, and variable-length encoding
Techniques are applied to achieve additional compression. Altogether, JPEG’s baseline standard normally
compresses color images by a factor of at least 10, and often by as much as 30, without noticeable loss of
quality.
SOC401 Final Term Past Paper 2021
