Abstract: The present invention provides an image reading apparatus that includes: a photoelectric sensor including plural reading pixels aligned in one direction and output an electric signal depending on the amount of light from an image on the document; a read control section that reads a document image with the photoelectric sensor in accordance with a read instruction, and obtains image data; a black correction section that performs a black correction to adjust an output under dark condition of each reading pixel to a value within a predetermined range, the output under dark condition being an electric signal output when the amount of light input is zero; and a black correction execution determining section that determines whether to perform the black correction, when the read interval between each two document sheets of the multi-page document is equal to or shorter than a predetermined period of time.

Abstract: An image reading apparatus includes: an image reading unit including a light source and a light receiving unit, and being capable of reading an image of a document sheet with predetermined plural reading conditions; a first light quantity information acquiring unit acquiring first light quantity information on a quantity of light emitted from the light source to a first white reference plate and received by the light receiving unit, for each reading condition; a second light quantity information acquiring unit acquiring second light quantity information on a quantity of light emitted from the light source to a second white reference plate and received by the light receiving unit, for fewer reading conditions than all the plural reading conditions; and a third light quantity information acquiring unit acquiring the second light quantity information for reading conditions other than the fewer reading conditions by using the acquired first light quantity information.

Abstract: An image forming apparatus includes an image formation unit, a conveying unit and controller. The image formation unit includes a rotating photoreceptor, a latent image formation unit, a developing unit, a first transfer unit, and a second transfer unit. Regardless of forming or not forming on the photoreceptor a belt-shaped image which is not being transferred onto a recording medium, the controller controls the image forming unit such that formation of an image quality adjusting image that is not transferred to the recording medium starts from a predetermined position in a rotational direction of the photoreceptor, and such that the recorded image is formed further downstream in the rotational direction of the photoreceptor than an image quality adjusting image region.

Abstract: The image processor is provided with: a detection unit that detects plural specified images each having a shape from an image read out by an image reading apparatus; a first determination unit that determines presence or absence of other specific image other than a specified image out of the plural specified images detected by the detection unit, in a position determined in advance for the specified image; and a second determination unit that determines whether or not the specified image is to be subjected to a processing on the basis of a result of the determination of the presence or absence of the other specified image by the first determination unit.

Abstract: The image processor includes: an acquisition unit acquiring a read-out image read out by an image reading apparatus; a detection unit detecting, from the read-out image, an embedded image including a first specified image having a first shape and a second specified image having a second shape; an adding unit adding attribute information to a specified region in the embedded image, in accordance with an appearance ratio of the first specified image in the specified region, and adding attribute information to other region surrounding the specified region, in accordance with an appearance ratio of the first specified image in the other region; and a determination unit determining whether or not the specified region is to be subjected to a predetermined processing using the first specified image based on whether or not the attribute information added to the specified region corresponds to the attribute information added to the other region.

Abstract: An image reading apparatus includes: an image reading unit including a light source and a light receiving unit, and being capable of reading an image of a document sheet with predetermined plural reading conditions; a first light quantity information acquiring unit acquiring first light quantity information on a quantity of light emitted from the light source to a first white reference plate and received by the light receiving unit, for each reading condition; a second light quantity information acquiring unit acquiring second light quantity information on a quantity of light emitted from the light source to a second white reference plate and received by the light receiving unit, for fewer reading conditions than all the plural reading conditions; and a third light quantity information acquiring unit acquiring the second light quantity information for reading conditions other than the fewer reading conditions by using the acquired first light quantity information.

Abstract: An image forming apparatus includes an image formation unit, a conveying unit and controller. The image formation unit includes a rotating photoreceptor, a latent image formation unit, a developing unit, a first transfer unit, and a second transfer unit. Regardless of forming or not forming on the photoreceptor a belt-shaped image which is not being transferred onto a recording medium, the controller controls the image forming unit such that formation of an image quality adjusting image that is not transferred to the recording medium starts from a predetermined position in a rotational direction of the photoreceptor, and such that the recorded image is formed further downstream in the rotational direction of the photoreceptor than an image quality adjusting image region.

Abstract: The present invention provides an image reading apparatus that includes: a photoelectric sensor including plural reading pixels aligned in one direction and output an electric signal depending on the amount of light from an image on the document; a read control section that reads a document image with the photoelectric sensor in accordance with a read instruction, and obtains image data; a black correction section that performs a black correction to adjust an output under dark condition of each reading pixel to a value within a predetermined range, the output under dark condition being an electric signal output when the amount of light input is zero; and a black correction execution determining section that determines whether to perform the black correction, when the read interval between each two document sheets of the multi-page document is equal to or shorter than a predetermined period of time.

Abstract: The image processor is provided with: a detection unit that detects plural specified images each having a shape from an image read out by an image reading apparatus; a first determination unit that determines presence or absence of other specific image other than a specified image out of the plural specified images detected by the detection unit, in a position determined in advance for the specified image; and a second determination unit that determines whether or not the specified image is to be subjected to a processing on the basis of a result of the determination of the presence or absence of the other specified image by the first determination unit.

Abstract: The image processor includes: an acquisition unit acquiring a read-out image read out by an image reading apparatus; a detection unit detecting, from the read-out image, an embedded image including a first specified image having a first shape and a second specified image having a second shape; an adding unit adding attribute information to a specified region in the embedded image, in accordance with an appearance ratio of the first specified image in the specified region, and adding attribute information to other region surrounding the specified region, in accordance with an appearance ratio of the first specified image in the other region; and a determination unit determining whether or not the specified region is to be subjected to a predetermined processing using the first specified image based on whether or not the attribute information added to the specified region corresponds to the attribute information added to the other region.

Abstract: An image-forming apparatus includes a reading portion that reads an image of an original document, a detecting portion that detects a specific pattern image embedded in image data, a document size detecting portion that detects a size of the original document, and a controller that controls an output of the image data in accordance with the specific pattern image, and also controls not to output the image data if the size of the original document detected is smaller than a given size.