John H Riseman, Deceased

Title: The Innovative Contributions of John H Riseman

Introduction

John H Riseman was a notable inventor whose work significantly impacted the field of digital imaging. Based in Cambridge, MA, he was associated with Canon Kabushiki Kaisha, where he contributed to advancements in image generation technology. His innovative spirit and technical expertise led to the development of a unique apparatus that enhanced the quality of images derived from digital video signals.

Latest Patents

One of Riseman's key patents is titled "Apparatus for generating an image from a digital video signal." This invention focuses on creating high-quality images from digital video signals through a sophisticated system. The apparatus employs gamma correction using a digital look-up table, converting the processed digital signal into an analog video signal. Additionally, it generates a triangular wave reference pattern signal, which is compared with the analog video signal to produce a pulse-width-modulated signal. This signal is then utilized by a raster scanning print engine, such as a laser beam, to scan over a recording medium, resulting in the formation of high-quality images. The apparatus is versatile, as it can also work with analog video signals by converting them into digital format first.

Career Highlights

Throughout his career, John H Riseman made significant strides in the field of digital imaging. His work at Canon Kabushiki Kaisha allowed him to collaborate with other talented individuals, further enhancing the innovative environment in which he worked. His contributions have left a lasting legacy in the realm of image processing technology.

Collaborations

Riseman collaborated with notable coworkers, including John J Smith and Alice M d'Entremont. Their combined efforts in the field of digital imaging contributed to the development of advanced technologies that continue to influence the industry today.

Conclusion

John H Riseman's innovative contributions to digital imaging technology have had a profound impact on the field. His patent for generating high-quality images from digital video signals showcases his technical expertise and creativity. The legacy of his work continues to inspire future generations of inventors and innovators.