interview questions at an MNC

1. write the DCT equations (1D & 2D)

2. What is linear and non-linear quantization?

3. Which one we would use in jpeg compression?
4. What is vector and scalar quantization? Which one we would use in jpeg compression?

5. When you apply 90 degree rotation in spatial domain, what is the change in DCT domain?
Prove with equations.

6. Mpeg4SP block diagram

C programming: interview

1. Write function for bit reversal:

Char function(char Input_Number)
{
….
….
….
Return Output_Number;

}


ARM:

1. Explain 5 stage pipeline in ARM9E processor

2. compare ARM9, ARM11, Cortex.

Psychovisual Redundancy

PsychoVisual Redundancy

It is known that the human eye does not respond to all visual information with equal sensitivity. Some information is simply of less relative importance. This information is referred to as psychovisual redundant and can be eliminated without introducing any significant difference to the human eye. The reduction of redundant visual information has some practical applications in image compression. Since the reduction of psychovisual redundancy results in quantitative loss of information, this type of reduction is referred to as quantisation. The most common technique for quantisation is the reduction of number of colours used in the image., thus colour quantisation. Since some information is lost, the colour quantisation is an irreversible process. So the compression techniques that used such process are lossy. It should be noted that even if this method of compression is lossy, in situations where such compression technique is acceptable the compression can be very effective and reduce the size of the image considerably.

Aricent Interview experience

                                                                                                         
1. Questions on the architecture of the processors(multicore).
 
2. What is emulation byte.How an emulation byte is removed in ur architecture.

3. Why is it used?(emulation byte)

4. Difference between Cavlc and Cabac.

5. Asked to give detailed explaination of each cavlc and cabac with examples.

6. What are the final values that are sent to the decoder after arthimetic coding.
  (like range 0.34-0.367).

7. Explain each and every block in the encoder and decoder

8. Why reconstruction path is used in the encoder.

9. What can the 1st macro block of a frame can be coded in I frame.(IPCM or DC).

10.Explain reordering of the residual data.

11.Deblocking filter.

12.On what all parameters the boundary strength depends.

13.Tel me a case where BS=0.

14.Questions on motion estimation and compensation.

15.why half pel and quarter pel are used instead of  integer pel.

H.264 interview experience

1. What is a video codec.

2. why we need video compression.

3. what are the different types of redundancy in an image.

4. what is temporal redundancy.

5. what is spatial redundancy.

6. what is psycho visual redundancy.

7. what is statistical redundancy.

8. Draw the block diagram of video codec .

9. why there is a reconstruction path in the encoder.

10. What are the advantages and disadvantages of reconstruction path in encoder

Introduction

Hi all

The aim of the blog is to make people have good awareness about interviews.

It mainly has questions that are asked in the interviews by various companies.

I have found many sites where you can find interview questions and stuff.

Those sites are lacking many things . I never found interview experience

of people who are pursuing a career on embeddded systems & DSP

( Video codecs).I hope this blog helps you to gather the required stuff .

All the Best ...........