Video processing and recording apparatuses and methods
A method for video processing. A first video sequence (VS) is received. The first VS is processed to generate a second VS in a first resolution. The second VS is adjusted to a third VS in a second resolution. It is determined whether the difference between the first VS and the third VS is lower than a predetermined bias level. The second VS is encoded and output if the difference between the first VS and the third VS is lower than the predetermined bias level.
1. A method for video processing, performed by an electronic apparatus, comprising:
receiving a first video sequence (VS);
processing the first VS to generate a second VS in a first resolution;
adjusting the second VS to a third VS in a second resolution;
determining whether the difference between the first VS and the third VS is lower than a predetermined bias level;
acquiring statistical features corresponding to the third VS if the difference between the first VS and the third VS is not lower than the predetermined bias level;
redistributing a bitrate of each frame in the third VS contingent upon the acquired statistical features;
encoding the first VS to regenerate the second VS contingent upon the redistributed bitrates; and
encoding and outputting the second VS if the difference between the first VS and the third VS is lower than the predetermined bias level.
2. The method as claimed in claim 1 wherein the first resolution is smaller than the second resolution.
3. The method as claimed in claim 1 , further comprising:
calculating a differential value between the first VS and the third VS; and
adjusting the differential value to generate the third VS in the first resolution.
4. The method as claimed in claim 3 , further comprising:
receiving an original VS in a third resolution; and
converting the original VS to the first VS in the second resolution.
5. The method as claimed in claim 1 wherein the electronic apparatus is a computer, a hand-held device, a PDA (personal digital assistance), a microprocessor-based or programmable consumer electronics, or a digital video recorder.
6. The method as claimed in claim 1 wherein the difference between the first VS and the third VS is measured by SNR (signal to noise ratio) or root-mean square error.
7. The method as claimed in claim 1 wherein the first VS comprises a plurality of frames in the second resolution, the second VS comprises a plurality of encoded frames in the first resolution, and the third VS comprises a plurality of encoded frames in the second resolution.
8. An apparatus for video encoding comprising:
a receiving unit;
an encoding unit coupled to the receiving unit, receiving a first video sequence (VS), processing the first VS to generate a second VS in a first resolution, adjusting the second VS to a third VS in a second resolution; and
an output unit encoding and outputting the second VS if the difference between the first VS and the third VS is lower than the predetermined bias level, wherein if the difference between the first VS and the third VS is not lower than the predetermined bias level, acquiring statistical features corresponding to the third VS, redistributing a bitrate of each frame in the third VS contingent upon the acquired statistical features, the encoding unit encodes the first VS to regenerate the second VS contingent upon the redistributed bitrates.
9. The apparatus as claimed in claim 8 wherein the encoding unit further comprises a comparison unit calculating a differential value between the first VS and the third VS, and adjusting the differential value to generate the third VS in the first resolution.
10. The apparatus as claimed in claim 9 wherein the receiving unit receiving an original VS in a third resolution, and converting the original VS to the first VS in the second resolution.
11. A method for video processing, performed by an electronic apparatus, comprising:
receiving a first video sequence (VS);
processing the first VS to generate a second VS in a first resolution;
adjusting the second VS to a third VS in a second resolution;
determining whether the difference between the first VS and the third VS is lower than a predetermined bias level;
acquiring statistical features corresponding to the third VS;
redistributing a bitrate of each frame in the first VS contingent upon the acquired statistical features; and
encoding the first VS to generate the second VS contingent upon the redistributed bitrates; and
encoding and outputting the second VS if the difference between the first VS and the third VS is lower than the predetermined bias level.
12. The method as claimed in claim 11 further comprising encoding the first VS to acquire statistical features corresponding to the first VS using a CBR (constant bitrate) or a VBR (variable bitrate) approach.