发明名称 |
Image reading apparatus and method of determining gain value and offset value for image reading apparatus |
摘要 |
An image reading apparatus includes a light source for irradiating an original; a photoelectric converter for converting light reflected from the original to an analog signal; an A/D converter for converting the analog signal corresponding to each pixel from the photoelectric converter to the digital signal; and an adjusting device connected between the photoelectric converter and the A/D converter for performing an offset processing and a gain processing of the analog signal from the photoelectric converter. A memory stores a relational formula representing a correlation between an offset value for the offset processing and a gain value for the gain processing. An offset value calculating device obtains an offset value corresponding to a gain value used in the gain processing of the analog signal by using the gain value and the relational formula stored in the memory.
|
申请公布号 |
US6967605(B2) |
申请公布日期 |
2005.11.22 |
申请号 |
US20040901330 |
申请日期 |
2004.07.29 |
申请人 |
NISCA CORPORATION |
发明人 |
FUJIHARA HIDEYA;OOTSUKA HIKARU |
分类号 |
H03M1/10;H03M1/12;H04N1/407;(IPC1-7):H03M1/00 |
主分类号 |
H03M1/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|