Image analysis – Image compression or coding – Transform coding
Patent
1997-10-02
2000-10-31
Mancuso, Joseph
Image analysis
Image compression or coding
Transform coding
G06T 900
Patent
active
061414557
ABSTRACT:
An image sensing element for providing a series of voltage signals corresponding to a two-dimensional image, a two-dimensional analog DCT (discrete cosine transform) circuit for performing a two-dimensional DCT on the voltage signal series from the image sensing element in pixel blocks, and a quantization circuit for quantizing a result of the DCT are provided. The two-dimensional analog DCT circuit is formed of a row of analog sum-of-products arithmetic units for one-dimensional DCT and an analog memory array for matrix transposition. The quantization circuit converts a voltage representing a result of the DCT carried out by the two-dimensional analog DCT circuit into a digital value according to a given quantization coefficient Q=2.sup.N .multidot.S(1.ltoreq.S<2) wherein a voltage S.multidot.Vref that is S times greater than a fixed voltage Vref serves as a reference voltage, and performs a process of right-shifting the digital value N bits in order to provide a quantized digital value.
REFERENCES:
patent: 4152772 (1979-05-01), Speiser et al.
patent: 4156923 (1979-05-01), Lampe et al.
patent: 4161785 (1979-07-01), Gasparek
patent: 4878754 (1989-11-01), Homma et al.
patent: 5396291 (1995-03-01), Sanpei
patent: 5862070 (1999-01-01), Shou et al.
A.M. Chiang, et al., "A 100ns 16-Point CCD Cosine Transform Processor", ISSCC Digest of Technical Papers, pp. 306-307, Feb. 1987.
XP-000753063 -ISSCC97/ SESSION 11 IMAGING CIRCUITS AND SYSTEMS / PAPER FA 11.3 -Shoji Kawahito, Makoto Yoshida Masaaki Sasaki, Keijiro Umehara, Yoshiaki Tadokoro, Kenji Murata, Shirou Doushou, Akira Matsuzawa -pp. 184 & 185.
A 128 x 128 CMOS Active Pixel Image Sensor for Highly Integrated Imaging Systems -Sunetra K. Mendis, Sabrina E. Kemeny and Eric R. Fossum -pp. 583-586.
Random addressable CMOS image sensor for industrial applications -Nico Ricquier, Bart Dierickx Received Jun. 16, 1993; in revised form Jan. 13, 1994; accepted Jan. 25, 1994 -pp. 29 -35.
Kawahito Shoji
Matsuzawa Akira
Tadokoro Yoshiaki
Mancuso Joseph
Matsushita Electric - Industrial Co., Ltd.
Schirduan Paul H.
LandOfFree
Image encoding apparatus employing analog processing system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image encoding apparatus employing analog processing system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image encoding apparatus employing analog processing system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2063015