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Transform coding
- 1. TRANSFORM CODING Presented By :Nancy B.C.A. Final
- 2. CONTENTS • What isTransform Coding ? • Why it is needed ? • How it is carried out ? • Features
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- 4. TRANSFORMATION Converting a bundleof data into an alternate form, which is more convenient for some purpose.
- 5. CODING Coding means aprocess which is carried out to get some specific output.
- 6. The purpose of Transformationcoding is to convert the data (images/videos) into a form where they could be easily compressed.
- 7. Bits in arrayof pixels A B C D
- 8. Original Format Pixels Bitsused to store them A 8 B 8 C 8 D 8 Total 32
- 9. In Transformation process Transform InverseTransform X0 = A A = X0 X1 = B - A B = X1 + X0 X2 = C - A C = X2 + X0 X3 = D - A D = X3 + X0
- 10. After Transformation Pixels Bitsused to store them A = X0 8 B = X1 + X0 4 C = X2 + X0 4 D = X3 + X0 4 Total 20
- 11. FEATURES • It’s aLOSSY COMPRESSION technique. • Generally used for converting natural data such as audio signals and photographic images. • Removes REDUNDANCY from the data. • Lowers the BANDWIDTH of data. • Forms an image with fewer colors. • JPEG(Joint Photography Experts Group) is an example of Transform Coding.
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