New pseudo-color reducing procedure was developed for single-imaging device color cameras with primary filter. It's the method that CCM interpolating method developed for complementary color filter was applied. The new method can reduce pseudo-color signals reproduced at edges of monochromatic objects sufficiently.
We have developed a color still camera using a Bayer arrangement CCD by the application of an image-shift that is of one pixel pitch displacement in a horizontal direction. Because of 2 positional imaging, a simplified an image-shift mechanism and a high speed imaging have been available for our experimental camera. We have improved a resolution and suppressed a color moire, by a new color moire suppression processing that makes use of a correlation with each RGB channel. We have eliminated the difference of light quantity between two images using a simple l-dimensional lowpass filter in a horizontal direction.
A CMOS Image sensor with 3.7 μm x 3.7 μm pixels, has been realized using 0.6 μm CMOS process for the first time. The pixel has been characterized by single drive-line/row which drives address capacitances and reset transistors with 3-level clock pulses. The sensor operates with a 3.3 V single power supply and 30mW dissipation.
A 256x256 buried charge accumulator and sensing transistor array (BCAST) image sensor with on-chip motion processing and video circuits has been developed. The complete on-chip motion detection and the reproduction of high-quality images are performed simultaneously with per-column simple circuits. A 2 μm twin-tub CMOS process is used for its on-chip circuits. The dynamic range of 78.2dB and the FPN of 76dB at 60Frames/s have been achieved. Furthermore, high speed operations at 240Frames/s with a digital output are performed. The results will extend the application of motion sensing to fields requiring high quality images.
We have developed a 1/2-inch 1.3M-pixel progressive-scan interline-transfer CCD image sensor. It provides both 15 frames/sec 1O50-line progressive color pictures and 30 frames/sec 525-line progressive color pictures. A two-phase drive horizontal CCD with phosphorus-implanted storage regions helps reduce the driving voltage to 2.5 V. A source-follower amplifier with separate p-well driver transistors achieves a gain 12% higher than that of a conventional amplifier. This sensor is useful in producing small size, low cost, and high resolution digital still cameras for consumer multimedia applications.
A world-smallest image sensor, 1mm 50k-pixel interline CCD has been developed. It features an extremely small pixel of 4x4 square micron, integration of a Vsub adjust circuit and a package-less assembliy of a chip provided microlens. The resultant chip size and the assembled device outer size are 1.1(H)x1.34(V)mm^2 and 1.2(H)x1.5(V)mm^2,respectively.
A dual pixel progressive-scan CMOS CCD image sensor has been developed. This device has on-chip CMOS drivers to simplify camera systems. It has dual pixel square unit to get high resolution with high fidelity color. Each square unit has two color pixels of green and red, or green and blue. The number of effective pixels is 480^V x 320^H and reproduces 240^V × 320^H(QVGA) image. Sensitivity of 370mV(1/30sec, 1200nit, F8), saturation voltage of 500mV and smear ratio of -97dB(F2.8) have been achieved.